CN118223073B - Combined start-stop control method for multiple types of multiple electrolytic tanks - Google Patents
Combined start-stop control method for multiple types of multiple electrolytic tanks Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000001276 controlling effect Effects 0.000 description 51
- 238000005868 electrolysis reaction Methods 0.000 description 31
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 18
- 229910052739 hydrogen Inorganic materials 0.000 description 18
- 239000001257 hydrogen Substances 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000004913 activation Effects 0.000 description 4
- 238000001994 activation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
The invention provides a combined start-stop control method of multiple types of multiple electrolytic tanks, which comprises the following steps: when the combination of the multi-class multi-electrolytic cells starts to work, the number a and rated power Pl of the low-power electrolytic cells, the number b and rated power Pm of the medium-power electrolytic cells, the number c and rated power Ph of the high-power electrolytic cells are respectively collected, and the input power Pin of the green energy is obtained. Step 2, based on the comparison and judgment of the input power Pin of the green energy and the total rated power of the low-power electrolytic cell, the medium-power electrolytic cell and the high-power electrolytic cell, the start-stop control is carried out on the combination of multiple types of multiple electrolytic cells; the lower limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfl, and the upper limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfh. The invention realizes the high-efficiency utilization of the fluctuation power by carrying out the combination control on the electrolytic tanks with different types and capacities.
Description
Technical Field
The invention relates to the technical field of hydrogen production by water electrolysis, in particular to a combined start-stop control method for multiple types of multiple electrolytic tanks.
Background
Hydrogen energy is an ideal secondary energy source, compared with other energy sources, the heat value of hydrogen is high, the combustion product is water, the hydrogen energy is considered as the most environment-friendly energy source, and the hydrogen energy is considered as the ultimate energy source of the future human society, and the water electrolysis hydrogen production is an effective way for obtaining hydrogen.
In the related technology, the existing mature alkaline water electrolysis hydrogen production system is relatively mature in technology, simple in process and low in cost, but the load operation range is smaller, about 20% -100%, and the large-scale multi-equipment coordination control strategy is complex.
Green hydrogen is an emerging environment-friendly hydrogen production technology, which uses green electricity such as wind power generation, water and the like power generation, solar power generation and the like as input energy for water electrolysis hydrogen production. However, during system operation, the problem of power distribution strategy for multiple cells is concentrated on due to green electricity uncertainty and instability:
1. The conventional alkali liquor multi-tank hydrogen production system has a small load range, and cannot realize the efficient utilization of green electricity.
2. The response speed of the alkaline electrolysis bath is slower, the inertia is large, and the alkaline electrolysis bath cannot well cope with some power fluctuation scenes.
Disclosure of Invention
In order to solve the defects existing in the prior art, the invention provides a combined start-stop control method of a multi-class multi-electrolytic cell, which comprises the following steps:
When the combination of the multi-class multi-electrolytic cells starts to work, the number a and rated power Pl of the low-power electrolytic cells, the number b and rated power Pm of the medium-power electrolytic cells, the number c and rated power Ph of the high-power electrolytic cells are respectively collected, and the input power Pin of the green energy is obtained.
And 2, comparing and judging the input power Pin of the green energy with the total rated power of the low-power electrolytic cell, the medium-power electrolytic cell and the high-power electrolytic cell, and controlling the start and stop of the combination of the multi-class multi-electrolytic cell. Wherein, the lower limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfl, and the upper limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfh, specifically comprising:
Judgment control 1: and if the input power Pin is less than or equal to the rated power a Pl of all the low-power electrolytic cells, performing start-stop control of the low-power electrolytic cell group.
Judgment control 2: and if the input power Pin is greater than the rated power a Pl of all low-power electrolytic cells and is less than or equal to the rated power sum a Pl+b Pm of all low-power electrolytic cells and all medium-power electrolytic cells, performing start-stop control of the combination of the low-power electrolytic cells and the medium-power electrolytic cells.
Judgment control 3: and if the input power Pin is larger than the rated power sum a Pl+b Pm of all the low-power electrolytic cells and all the medium-power electrolytic cells, performing start-stop control of the combination of the low-power electrolytic cells, the medium-power electrolytic cells and the high-power electrolytic cells.
Further, the low-power electrolytic tank is a PEM electrolytic tank, the medium-power electrolytic tank and the high-power electrolytic tank are alkaline electrolytic tanks, and the rated power Ph of the high-power electrolytic tank is larger than the rated power Pm of the medium-power electrolytic tank and larger than the rated power Pl of the PEM electrolytic tank.
Further, the method for performing start-stop control of the low-power electrolytic cell group according to the judgment control 1 includes:
After starting i low power PEM cells, the power difference a=pin-i pi is calculated and the start and shut down of the low power cells are controlled according to the range of values of the power difference a.
Further, the method for controlling the start-up and the shut-down of the low power electrolytic cell according to the numerical range of the power difference A comprises the following steps:
Judgment control 1.1: when the power difference a > 0.05 x Pl, a new low power electrolytic cell is started, and a new power difference a=pin- (i+1) x Pl is calculated, and the low power electrolytic cell is controlled to be started and shut down according to the value range of the new power difference a. If the number of low power electrolyzer activations i has reached the number of low power electrolyzer's a, step 2 is re-entered.
Judgment control 1.2: when the power difference a < -0.95×pl, a low power electrolytic cell is closed, and a new power difference a=pin- (i-1) ×pl is calculated, and the low power electrolytic cell is controlled to be started and closed according to the value range of the new power difference a. If all low power cells are shut down, step 2 is re-entered.
Judgment control 1.3: when the power difference A is less than or equal to-0.95 Pl and less than or equal to 0.05 Pl, maintaining the current starting of i low-power electrolytic cells unchanged, recalculating the power difference A when Pin is updated, and controlling the starting and the closing of the low-power electrolytic cells according to the numerical range of the power difference A.
Further, the method for performing start-stop control of the combination of the low power electrolytic cell and the medium power electrolytic cell according to the judgment control 2 includes:
Judgment control 2.1: if the fluctuation amplitude of the load is less than or equal to 15%, starting all the low-power electrolytic cells, and starting and stopping the medium-power electrolytic cells. Meanwhile, calculating a power difference b=pin-a pi-j Pm, and controlling the start-up and the shut-down of the power electrolytic cell in accordance with the numerical range of the power difference B. Where j is the number of starts of medium power cells.
Judgment control 2.2: and if the load fluctuation amplitude is more than 15%, carrying out load adjustment of the medium-low power electrolytic tank.
Further, the method for controlling the start-up and the shut-down of the power electrolytic cell in the numerical range control according to the power difference B in the judgment control 2.1 includes:
Judgment control 2.1.1: when the power difference B is more than 0.3×pm, a new medium-power electrolytic cell is started, a new power difference b=pin-a×pl- (j+1) ×pm is calculated, and the start and the stop of the medium-power electrolytic cell are controlled according to the numerical range of the new power difference B. If the number j of medium power electrolysis cells started has reached the number b of medium power electrolysis cells, step 2 is re-entered.
Judgment control 2.1.2: when the power difference B < -0.7×Pm, closing a middle power electrolytic cell, simultaneously calculating a new power difference B=Pin-a×Pl- (j-1) ×Pm, and controlling the starting and closing of the middle power electrolytic cell according to the numerical range of the new power difference B. If all medium power cells are shut down, step 2 is re-entered.
Judgment control 2.1.3: when the power difference B is less than or equal to-0.7 and less than or equal to 0.3, maintaining the power of the low power electrolytic cells a and the power of the medium power electrolytic cells j to be unchanged at present, recalculating the power difference B when Pin is updated, and controlling the starting and the closing of the medium power electrolytic cells according to the numerical range of the power difference B.
Further, the method for judging and controlling the load adjustment of the medium-low power electrolytic tank in 2.2 comprises the following steps:
and starting j middle power electrolytic tanks, and controlling the starting and closing of the low power electrolytic tanks and the middle power electrolytic tanks according to the relation between the total rated power j of the started middle power electrolytic tanks and the lower limit value Pfl of the fluctuation range.
Further, the method for controlling the starting and closing of the low power electrolytic cell and the medium power electrolytic cell according to the relation between the total rated power j×pm of the started medium power electrolytic cell and the lower limit value Pfl of the fluctuation range comprises the following steps:
Judging and controlling 2.2.1 when j is less than or equal to Pfl, starting a new medium power electrolytic tank, calculating the total rated power (j+1) Pm of the new started medium power electrolytic tank, and if (j+1) Pm is still less than or equal to Pfl, continuing to start the new medium power electrolytic tank until (j+n) Pm is more than Pfl and (j+n) is less than or equal to b.
Judging and controlling 2.2.2 when j is greater than Pfl, starting a low-power electrolytic tank, judging whether the current load fluctuation amplitude is less than or equal to 15%, and continuing to judge and control as follows:
And (2) judging that the control is 2.2.2.1, and if the current load fluctuation amplitude is less than or equal to 15%, re-entering the step (2).
Judging and controlling 2.2.2.2 if the current load fluctuation amplitude is more than 15%, and Pin-i Pl-j Pm is more than 0.05 Pl, returning to judging and controlling 2.2.2, restarting a low-power electrolytic cell, and judging whether the current load fluctuation amplitude is less than or equal to 15%. Where i is the number of starts of low power electrolysis.
If the current load fluctuation amplitude is greater than 15%, and-0.95 pi is less than or equal to Pin-i pi-j Pm is less than or equal to 0.05 pi, the judgment control 2.2.2.3 maintains the current start of i low-power electrolytic cells and j medium-power electrolytic cells, and the step 2 is re-entered after Pin is updated.
If the current load fluctuation amplitude is greater than 15% and Pin-i pi-j Pm < -0.95 pi, the judgment control 2.2.2.4 turns off one low-power electrolytic cell and returns to the judgment control 2.2.2, and judges whether the current load fluctuation amplitude is less than or equal to 15%. Where i is the number of starts for low power electrolysis and j is the number of starts for medium power electrolysis.
Further, the method for performing start-stop control of the combination of the low-power electrolytic cell, the medium-power electrolytic cell and the high-power electrolytic cell according to the judgment control 3 includes:
Judgment control 3.1: if the fluctuation amplitude of the load is less than or equal to 15%, starting all the low-power electrolytic cells and the medium-power electrolytic cells, and starting and stopping the high-power electrolytic cells. Meanwhile, calculating a power difference c=pin-a pi-b Pm-k Ph, and controlling the start-up and shut-down of the high-power electrolytic cell according to the numerical range of the power difference C. Where k is the number of starts of the high power electrolyzer.
Judgment control 3.2: and if the load fluctuation amplitude is more than 15%, carrying out high-middle-low power electrolytic tank load adjustment.
Further, the method for controlling the start-up and the shut-down of the high power electrolytic cell according to the numerical range of the power difference C in the judgment control 3.1 includes:
Judgment control 3.1.1: when the power difference C > 0.3 x Ph, a new high-power electrolytic cell is started, and a new power difference c=pin-a pi-b Pm- (k+1) Ph is calculated, and the starting and the closing of the high-power electrolytic cell are controlled according to the numerical range of the new power difference C. If the number k of high power electrolyzer activations has reached the number c of high power electrolyzer, step 2 is re-entered.
Judgment control 3.1.2: when the power difference C < -0.7 Ph, closing a high-power electrolytic tank, simultaneously calculating a new power difference C=Pin-a Pl-b Pm- (k-1) Ph, and controlling the starting and closing of the high-power electrolytic tank according to the numerical range of the new power difference C. If all high power cells are shut down, step 2 is re-entered.
Judgment control 3.1.3: when the power difference C is less than or equal to-0.7 and less than or equal to 0.3, the current starting of a low-power electrolytic cells, b medium-power electrolytic cells and k high-power electrolytic cells is maintained unchanged, the power difference C is recalculated when Pin is updated, and the starting and the closing of the high-power electrolytic cells are controlled according to the numerical range of the power difference C.
Further, the method for judging and controlling the load adjustment of the high-power, medium-power and low-power electrolytic tank in 3.2 comprises the following steps:
Starting b medium-power electrolytic cells and k high-power electrolytic cells, and controlling the starting and the closing of the low-power electrolytic cells and the high-power electrolytic cells according to the relation between the total rated power b+pm+k Ph of the started high-power electrolytic cells and the lower limit value Pfl of the fluctuation range.
Further, the method for controlling the start-up and shut-down of the low power electrolytic cell and the high power electrolytic cell according to the relation between the total rated power b x pm+k x Ph of the started high power electrolytic cell and the lower limit value Pfl of the fluctuation range comprises the following steps:
Judging and controlling 3.2.1 when b is Pm+k is less than or equal to Pfl, starting a new high-power electrolytic cell, calculating the total rated power b is Pm+ (k+1) Ph of the new started medium-power electrolytic cell and high-power electrolytic cell, and if b is Pm+ (k+1) Ph is still less than or equal to Pfl, continuing to start the new high-power electrolytic cell until b is Pm+ (k+m) Ph > Pfl, and (k+m) is less than or equal to c.
3.2.2, When b+k+Ph > Pfl, starting a low-power electrolytic cell, judging whether the current load fluctuation amplitude is less than or equal to 15%, and continuing to perform the following judgment control:
and 3.2.2.1, if the current load fluctuation amplitude is less than or equal to 15%, re-entering the step 2.
Judging and controlling 3.2.2.2 if the current load fluctuation amplitude is larger than 15%, and Pin-i pi-b Pm-k pi > 0.05 pi, returning to judging and controlling 2.2.2, restarting a low-power electrolytic cell, and judging whether the current load fluctuation amplitude is smaller than or equal to 15%. Wherein i is the starting number of low-power electrolysis, k is the starting number of high-power electrolysis, and b medium-power electrolytic cells are all started.
Judging and controlling 3.2.2.3 if the current load fluctuation amplitude is more than 15%, and-0.95 Pl is less than or equal to Pin-i Pl-b Pm-k Ph is less than or equal to 0.05 Pl, maintaining the current starting of all of i low-power electrolytic cells, k high-power electrolytic cells and b medium-power electrolytic cells, and re-entering the step 2 after Pin is updated.
If the current load fluctuation amplitude is greater than 15%, and Pin-i pi-b Pm-k Ph < -0.95 pi, the judgment control 3.2.2.4 turns off a low-power electrolytic cell and returns to the judgment control 3.2.2, and judges whether the current load fluctuation amplitude is less than or equal to 15%. Wherein i is the starting number of low-power electrolysis, k is the starting number of high-power electrolysis, and b medium-power electrolytic cells are all started.
The invention has at least one of the following beneficial effects:
1. according to the invention, through the combined control of the electrolytic tanks with different types and capacities, the power is distributed by utilizing the characteristics of the different electrolytic tanks, so that the efficient utilization of the fluctuation power is realized.
2. The invention realizes better utilization of the input fluctuation green electricity with instability and uncertainty, and remarkably improves the hydrogen production amount and the hydrogen production efficiency of the hydrogen production system.
Drawings
FIG. 1 is a flow chart of the steps of a combined start-stop control method for multiple types of multiple electrolytic cells according to the present invention;
FIG. 2 is a flow chart of the steps of the low power electrolyzer load regulation method of the present invention;
FIG. 3 is a flow chart of the steps of the method for regulating the load of the high-medium-low power electrolytic tank.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
Note that "upper", "lower", "left", "right", "top", "bottom", and the like are used in order to describe positional relationships in the present invention, and do not represent absolute positional relationships among the respective modules/members/components/parts/sections, but rather relative positional relationships among the respective modules/members/components/sections.
The invention provides a combined start-stop control method of multiple types of multiple electrolytic tanks, which comprises the following steps:
When the combination of the multi-class multi-electrolytic cells starts to work, the number a and rated power Pl of the low-power electrolytic cells, the number b and rated power Pm of the medium-power electrolytic cells, the number c and rated power Ph of the high-power electrolytic cells are respectively collected, and the input power Pin of the green energy is obtained.
And 2, comparing and judging the input power Pin of the green energy with the total rated power of the low-power electrolytic cell, the medium-power electrolytic cell and the high-power electrolytic cell, and controlling the start and stop of the combination of the multi-class multi-electrolytic cell. Wherein, the lower limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfl, and the upper limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfh, at this time:
Judgment control 1: and if the input power Pin is less than or equal to the rated power a Pl of all the low-power electrolytic cells, performing start-stop control of the low-power electrolytic cell group.
Judgment control 2: and if the input power Pin is greater than the rated power a Pl of all low-power electrolytic cells and is less than or equal to the rated power sum a Pl+b Pm of all low-power electrolytic cells and all medium-power electrolytic cells, performing start-stop control of the combination of the low-power electrolytic cells and the medium-power electrolytic cells.
Judgment control 3: and if the input power Pin is larger than the rated power sum a Pl+b Pm of all the low-power electrolytic cells and all the medium-power electrolytic cells, performing start-stop control of the combination of the low-power electrolytic cells, the medium-power electrolytic cells and the high-power electrolytic cells.
The present invention illustratively provides a low power electrolytic cell, a medium power electrolytic cell, and a high power electrolytic cell, wherein: the low power electrolytic tank is a PEM electrolytic tank, the medium power electrolytic tank and the high power electrolytic tank are alkaline electrolytic tanks, and the rated power Ph of the high power electrolytic tank is larger than the rated power Pm of the medium power electrolytic tank and larger than the rated power Pl of the PEM electrolytic tank.
The invention provides a method for judging and controlling start and stop of a low-power electrolytic tank group by control 1, which comprises the following steps:
After starting i low power PEM cells, the power difference a=pin-i pi is calculated and the start and shut down of the low power cells are controlled according to the range of values of the power difference a.
The present invention illustratively provides a method of controlling the start-up and shut-down of a low power electrolysis cell according to a range of values of power difference a, comprising:
Judgment control 1.1: when the power difference a > 0.05 x Pl, a new low power electrolytic cell is started, and a new power difference a=pin- (i+1) x Pl is calculated, and the low power electrolytic cell is controlled to be started and shut down according to the value range of the new power difference a. If the number of low power electrolyzer activations i has reached the number of low power electrolyzer's a, step 2 is re-entered.
Judgment control 1.2: when the power difference a < -0.95×pl, a low power electrolytic cell is closed, and a new power difference a=pin- (i-1) ×pl is calculated, and the low power electrolytic cell is controlled to be started and closed according to the value range of the new power difference a. If all low power cells are shut down, step 2 is re-entered.
Judgment control 1.3: when the power difference A is less than or equal to-0.95 Pl and less than or equal to 0.05 Pl, maintaining the current starting of i low-power electrolytic cells unchanged, recalculating the power difference A when Pin is updated, and controlling the starting and the closing of the low-power electrolytic cells according to the numerical range of the power difference A.
The invention provides a method for judging and controlling start and stop of a low-power electrolytic cell and medium-power electrolytic cell combination in control 2, which comprises the following steps:
Judgment control 2.1: if the fluctuation amplitude of the load is less than or equal to 15%, starting all the low-power electrolytic cells, and starting and stopping the medium-power electrolytic cells. Meanwhile, calculating a power difference b=pin-a pi-j Pm, and controlling the start-up and the shut-down of the power electrolytic cell in accordance with the numerical range of the power difference B. Where j is the number of starts of medium power cells.
Judgment control 2.2: and if the load fluctuation amplitude is more than 15%, carrying out load adjustment of the medium-low power electrolytic tank.
The invention provides a method for judging and controlling the starting and closing of a power electrolytic tank in the numerical range control according to a power difference B of 2.1, which comprises the following steps:
Judgment control 2.1.1: when the power difference B is more than 0.3×pm, a new medium-power electrolytic cell is started, a new power difference b=pin-a×pl- (j+1) ×pm is calculated, and the start and the stop of the medium-power electrolytic cell are controlled according to the numerical range of the new power difference B. If the number j of medium power electrolysis cells started has reached the number b of medium power electrolysis cells, step 2 is re-entered.
Judgment control 2.1.2: when the power difference B < -0.7×Pm, closing a middle power electrolytic cell, simultaneously calculating a new power difference B=Pin-a×Pl- (j-1) ×Pm, and controlling the starting and closing of the middle power electrolytic cell according to the numerical range of the new power difference B. If all medium power cells are shut down, step 2 is re-entered.
Judgment control 2.1.3: when the power difference B is less than or equal to-0.7 and less than or equal to 0.3, maintaining the power of the low power electrolytic cells a and the power of the medium power electrolytic cells j to be unchanged at present, recalculating the power difference B when Pin is updated, and controlling the starting and the closing of the medium power electrolytic cells according to the numerical range of the power difference B.
The invention provides a method for judging and controlling the load regulation of a medium-low power electrolytic tank of 2.2, which comprises the following steps:
and starting j middle power electrolytic tanks, and controlling the starting and closing of the low power electrolytic tanks and the middle power electrolytic tanks according to the relation between the total rated power j of the started middle power electrolytic tanks and the lower limit value Pfl of the fluctuation range.
The present invention illustratively provides a method of controlling the start-up and shut-down of a low power electrolysis cell and a medium power electrolysis cell according to the relationship of the total rated power j of the started medium power electrolysis cell Pm and the lower limit value Pfl of the fluctuation range, comprising:
Judging and controlling 2.2.1 when j is less than or equal to Pfl, starting a new medium power electrolytic tank, calculating the total rated power (j+1) Pm of the new started medium power electrolytic tank, and if (j+1) Pm is still less than or equal to Pfl, continuing to start the new medium power electrolytic tank until (j+n) Pm is more than Pfl and (j+n) is less than or equal to b.
Judging and controlling 2.2.2 when j is greater than Pfl, starting a low-power electrolytic tank, judging whether the current load fluctuation amplitude is less than or equal to 15%, and continuing to judge and control as follows:
And (2) judging that the control is 2.2.2.1, and if the current load fluctuation amplitude is less than or equal to 15%, re-entering the step (2).
Judging and controlling 2.2.2.2 if the current load fluctuation amplitude is more than 15%, and Pin-i Pl-j Pm is more than 0.05 Pl, returning to judging and controlling 2.2.2, restarting a low-power electrolytic cell, and judging whether the current load fluctuation amplitude is less than or equal to 15%. Where i is the number of starts of low power electrolysis.
If the current load fluctuation amplitude is greater than 15%, and-0.95 pi is less than or equal to Pin-i pi-j Pm is less than or equal to 0.05 pi, the judgment control 2.2.2.3 maintains the current start of i low-power electrolytic cells and j medium-power electrolytic cells, and the step 2 is re-entered after Pin is updated.
If the current load fluctuation amplitude is greater than 15% and Pin-i pi-j Pm < -0.95 pi, the judgment control 2.2.2.4 turns off one low-power electrolytic cell and returns to the judgment control 2.2.2, and judges whether the current load fluctuation amplitude is less than or equal to 15%. Where i is the number of starts for low power electrolysis and j is the number of starts for medium power electrolysis.
The invention provides a method for controlling start and stop of a low-power electrolytic cell, a medium-power electrolytic cell and a high-power electrolytic cell in combination by judging control 3, which comprises the following steps:
Judgment control 3.1: if the fluctuation amplitude of the load is less than or equal to 15%, starting all the low-power electrolytic cells and the medium-power electrolytic cells, and starting and stopping the high-power electrolytic cells. Meanwhile, calculating a power difference c=pin-a pi-b Pm-k Ph, and controlling the start-up and shut-down of the high-power electrolytic cell according to the numerical range of the power difference C. Where k is the number of starts of the high power electrolyzer.
Judgment control 3.2: and if the load fluctuation amplitude is more than 15%, carrying out high-middle-low power electrolytic tank load adjustment.
The invention provides a method for controlling the starting and closing of a high-power electrolytic tank according to the numerical range of a power difference C in judgment control 3.1, which comprises the following steps:
Judgment control 3.1.1: when the power difference C > 0.3 x Ph, a new high-power electrolytic cell is started, and a new power difference c=pin-a pi-b Pm- (k+1) Ph is calculated, and the starting and the closing of the high-power electrolytic cell are controlled according to the numerical range of the new power difference C. If the number k of high power electrolyzer activations has reached the number c of high power electrolyzer, step 2 is re-entered.
Judgment control 3.1.2: when the power difference C < -0.7 Ph, closing a high-power electrolytic tank, simultaneously calculating a new power difference C=Pin-a Pl-b Pm- (k-1) Ph, and controlling the starting and closing of the high-power electrolytic tank according to the numerical range of the new power difference C. If all high power cells are shut down, step 2 is re-entered.
Judgment control 3.1.3: when the power difference C is less than or equal to-0.7 and less than or equal to 0.3, the current starting of a low-power electrolytic cells, b medium-power electrolytic cells and k high-power electrolytic cells is maintained unchanged, the power difference C is recalculated when Pin is updated, and the starting and the closing of the high-power electrolytic cells are controlled according to the numerical range of the power difference C.
The invention provides a method for judging and controlling the load regulation of a high-middle-low power electrolytic tank of 3.2, which comprises the following steps:
Starting b medium-power electrolytic cells and k high-power electrolytic cells, and controlling the starting and the closing of the low-power electrolytic cells and the high-power electrolytic cells according to the relation between the total rated power b+pm+k Ph of the started high-power electrolytic cells and the lower limit value Pfl of the fluctuation range.
The present invention illustratively provides a method of controlling the start-up and shut-down of a low power electrolysis cell and a high power electrolysis cell according to the relation of the total rated power b, pm + k, ph of the started high power electrolysis cell and the lower limit value Pfl of the fluctuation range, comprising:
Judging and controlling 3.2.1 when b is Pm+k is less than or equal to Pfl, starting a new high-power electrolytic cell, calculating the total rated power b is Pm+ (k+1) Ph of the new started medium-power electrolytic cell and high-power electrolytic cell, and if b is Pm+ (k+1) Ph is still less than or equal to Pfl, continuing to start the new high-power electrolytic cell until b is Pm+ (k+m) Ph > Pfl, and (k+m) is less than or equal to c.
3.2.2, When b+k+Ph > Pfl, starting a low-power electrolytic cell, judging whether the current load fluctuation amplitude is less than or equal to 15%, and continuing to perform the following judgment control:
and 3.2.2.1, if the current load fluctuation amplitude is less than or equal to 15%, re-entering the step 2.
Judging and controlling 3.2.2.2 if the current load fluctuation amplitude is larger than 15%, and Pin-i pi-b Pm-k pi > 0.05 pi, returning to judging and controlling 2.2.2, restarting a low-power electrolytic cell, and judging whether the current load fluctuation amplitude is smaller than or equal to 15%. Wherein i is the starting number of low-power electrolysis, k is the starting number of high-power electrolysis, and b medium-power electrolytic cells are all started.
Judging and controlling 3.2.2.3 if the current load fluctuation amplitude is more than 15%, and-0.95 Pl is less than or equal to Pin-i Pl-b Pm-k Ph is less than or equal to 0.05 Pl, maintaining the current starting of all of i low-power electrolytic cells, k high-power electrolytic cells and b medium-power electrolytic cells, and re-entering the step 2 after Pin is updated.
If the current load fluctuation amplitude is greater than 15%, and Pin-i pi-b Pm-k Ph < -0.95 pi, the judgment control 3.2.2.4 turns off a low-power electrolytic cell and returns to the judgment control 3.2.2, and judges whether the current load fluctuation amplitude is less than or equal to 15%. Wherein i is the starting number of low-power electrolysis, k is the starting number of high-power electrolysis, and b medium-power electrolytic cells are all started.
According to the invention, through the combined control of the electrolytic tanks with different types and capacities, the power is distributed by utilizing the characteristics of the different electrolytic tanks, so that the efficient utilization of the fluctuation power is realized.
The invention realizes better utilization of the input fluctuation green electricity with instability and uncertainty, and remarkably improves the hydrogen production amount and the hydrogen production efficiency of the hydrogen production system.
In the following, a detailed description will be given of an example of control of an electrolytic cell configured in an electrolytic plant, in which "start 1" in fig. 1 corresponds to "step 2" in the present technology, and "start 2" in fig. 1 corresponds to "medium-low power electrolytic cell load adjustment method" in the present technology, and "start 3" in fig. 1 corresponds to "high-medium-low power electrolytic cell load adjustment method" in the present technology, with reference to the accompanying drawings.
The basic information of the electrolytic cell configured in a certain electrolytic plant is as follows: 3 low power PEM cells, 3 medium power lye cells, 3 high power lye cells. The rated power Pl of the low power PEM electrolyzer is 0.5MW, the rated power Pm of the medium power lye electrolyzer is 1MW, and the rated power Ph of the high power lye electrolyzer is 1.5MW. The analytical decision flow of fig. 1 to 3 was employed.
When Pin has a value of 1.2MW,
Firstly, judging the power level, judging whether Pin is larger than 3 xPl=1.5MW,
And judging whether the power is less than 1.5 or not (1.2 is less than 1.5), and performing start-stop control on the low-power PEM electrolyzer group.
The PEM electrolyzer is first activated 1 in number, i=1,
Then judging whether Pin-i pi is larger than 0.05 pi=0.025,
If it is determined that Pin-i pi=1.2-1 pi=0.5=0.7 > 0.05 pi=0.025), then a low power PEM electrolyzer is continuously started, i.e. i=i+1=2,
Then, continuously judging whether the starting number 2 is more than 3 at the moment,
If not, returning to the judgment of whether Pin-i Pl is larger than 0.05 Pl at the moment,
If the judgment is that the value is (0.2 > 0.025), a low-power PEM electrolytic cell is continuously started, namely i=i+1=3,
Then, continuously judging whether the starting number 3 is larger than 3 at the moment,
If the judgment is no (3=3), the judgment returns to the judgment whether Pin-i pi is larger than 0.05 pi at the moment,
Judging whether (-0.3 < 0.025), judging whether Pin-i Pl is less than-0.95 Pl,
Judging as no (-0.3 > -0.95×0.5= -0.475), at this time, satisfying: -0.95 pi < Pin-i pi < 0.05 pi (-0.475 < -0.3 < 0.025), which means that no action is required and only 3 low power PEM cells are started.
If Pin at this point falls to 0.6MW,
Judging whether Pin-i Pl is larger than 0.05 Pl at the moment,
Judging whether Pin-i pi= -0.9 < 0.05 pi = 0.025), judging whether Pin-i pi is less than-0.95 pi,
Judging to be (-0.9 < -0.475), closing a low-power PEM electrolytic cell, namely enabling i=i-1=2 > 0,
Then judging whether Pin-i Pl is larger than 0.05 Pl at the moment,
Judging whether (-0.4 < 0.025), judging whether Pin-i Pl is less than-0.95 Pl,
Judging as no (-0.4 > -0.475), at this time, satisfying: -0.95 pi < Pin-i pi < 0.05 pi (-0.475 < -0.4 < 0.025), which means that no action is required and only 2 low power PEM cells are started.
If Pin is raised to 2MW at this point,
Judging whether Pin-i Pl is larger than 0.05 Pl at the moment,
If it is determined that (Pin-iPl =1 > 0.05 pl=0.025), then a low power PEM electrolyzer is continuously started, i.e. let i=i+1=3,
Judging whether the starting number i is larger than 3 at the moment,
Judging as no (3=3),
Continuing to judge whether Pin-i Pl is larger than 0.05 Pl at the moment,
If it is determined that (Pin-iPl =0.5 > 0.05 pl=0.025), then a low power PEM electrolyzer is continuously started, i.e. let i=i+1=4,
Judging whether the starting number i is larger than 3 at the moment,
And (4 > 3) and returns to the beginning 1.
Judging whether Pin is larger than 3 xPl,
If yes (2 > 1.5), continuing to judge whether Pin is larger than a Pl+b Pm,
Judging whether (pin=2 < a pi+b pm=4.5),
Continuously judging whether the load fluctuation amplitude is larger than 15 percent at the moment,
Judging whether the load fluctuation amplitude is not more than 15%, and enabling i=3 and j=1, namely starting all low-power PEM electrolytic cells, and starting and stopping the medium-power alkaline electrolytic cells.
Continuing to judge whether Pin-a Pl-j Pm is larger than 0.3 Pl at the moment,
Judging whether (Pin-a pi-j pm= -0.5 < 0.3 Pm = 0.3),
Continuing to judge whether Pin-a Pl-j Pm is smaller than-0.7 Pl at the moment,
Judging as no (Pin-a pi-j pm= -0.5 > -0.7 pm= -0.7),
At this time, the following conditions are satisfied: -0.7 Pm < Pin-a Pl-j Pm < 0.3 Pm (-0.7 < -0.5 < 0.3), which means that no action is taken and only three low power PEM cells and one medium power lye cell need to be started.
If the Pin value at this time rises to 7MW and subsequently stabilizes,
Judging whether Pin-a Pl-j Pm is larger than 0.3 Pl at the moment,
If it is determined that (Pin-a pi-j pm=4.5 > 0.3 pm=0.3), j=j+1=2 is determined to be greater than b,
Judging as no (j=2 < b=3),
Continuing to judge whether Pin-a Pl-j Pm is larger than 0.3 Pl at the moment,
If it is determined that (Pin-a pi-j pm=3.5 > 0.3 pm=0.3), j=j+1=3, it is determined whether j is greater than b,
Judging as no (j=3=b=3),
Continuing to judge whether Pin-a Pl-j Pm is larger than 0.3 Pl at the moment,
If it is determined that (Pin-a pi-j pm=2.5 > 0.3 pm=0.3), j=j+1=4, it is determined whether j is greater than b,
The determination is yes (j=4 > b=3), and the process returns to the start 1.
Determining if Pin is greater than 3 x pl,
Judging as (pin=7 >3×pl=1.5), continuing to judge whether Pin is larger than a×pl+b×pm,
If the load fluctuation range is judged to be (pin=7 > a pi+b pm=4.5), whether the load fluctuation range is larger than 15% or not is continuously judged,
Judging whether (load fluctuation amplitude is not more than 15%), let i=3, j=3, k=1,
Judging whether Pin-a Pl-b Pm-k Ph is greater than 0.3 Ph at this time,
If it is determined that (Pin-a pi-b Pm-k ph=1 > 0.3 ph=0.45), k=k+1=2 is set, and it is determined whether the number k of starts is greater than c,
If the judgment is no (2<3),
Continuing to judge whether Pin-a Pl-b Pm-k Ph is larger than 0.3 Ph at the moment,
Judging whether (Pin-a Pl-b Pm-k Ph is less than 0.3 Ph=0.45), continuously judging whether Pin-a Pl-b Pm-k Ph is less than-0.7 Ph,
Judging as no (Pin-a pi-b Pm-k ph= -0.5 > -0.7 ph= -1.05), satisfying: -0.7 x Ph < Pin-a x Pl-b x Pm-k x Ph < 0.3 x Ph (-1.05 < -0.5 < 0.45), which means that no action is required to start up only three low power PEM cells, three medium power lye cells and two high power lye cells.
If the Pin value rapidly fluctuates within the range of 2-3 MW and the amplitude is greater than 15%,
Judging whether Pin is larger than a pi at the moment,
If yes (2-3 > 1.5), continuing to judge whether Pin is larger than a Pl+b Pm at the moment,
Judging whether the load fluctuation range is larger than 15% or not (2-3 is smaller than 4.5),
If the judgment is yes (the load fluctuation amplitude is more than 15%), the process proceeds to the beginning 2,
Let j=1, determine if j Pm is greater than Pfl,
Judging whether (j=pm=1.5 < pfl=2), starting a medium power lye electrolyzer, i.e. letting j=j+1=2,
Continuing to determine if j Pm is greater than Pfl,
Judging as (j. Pm=3 > Pfl=2), let i=1, judging whether the fluctuation amplitude is more than 15%,
Judging whether Pin-i pi-j Pm is larger than 0.05 pi or not (fluctuation amplitude is larger than 15%), judging whether Pin-i pi-j Pm is larger than 0.05 pi or not,
Judging whether (Pin-i pi-j Pm= -1.5 to-0.5 < 0.05 pi = 0.025), continuously judging whether Pin-i pi-j Pm is less than-0.95 pi= -0.475,
If the load fluctuation range is (-1.5 to-0.5 < -0.475), i=i-1=0, and judging whether the load fluctuation range is larger than 15%,
If the load fluctuation range is more than 15 percent, the judgment is continued, the startup of the PEM electrolytic cell is realized,
If not (load fluctuation width is less than 15%), the flow returns to the start 1, and the above-described flow is performed.
If the Pin value at this time rapidly fluctuates in the range of 7-8.3 MW and the amplitude is greater than 15%,
Judging whether Pin is larger than a pi at the moment,
If yes (7-8.3 > 1.5), continuing to judge whether Pin is larger than a Pl+b Pm at the moment,
If the load fluctuation range is more than 15 percent, the judgment is that (7-8.3 is more than 4.5),
If the judgment is yes (the load fluctuation amplitude is more than 15%), the process proceeds to the beginning 3,
Let j=3, k=1, determine if b pm+k Ph is greater than Pfl,
Judging whether (b, pm+k, ph=4.5 < pfl=7), starting a high-power lye electrolyzer, i.e. letting k=k+1=2,
Continuing to judge whether b+k Ph is greater than Pfl,
Judging whether (b, pm+k, ph=6 < pfl=7), opening a high power lye electrolyzer, namely making k=k+1=3,
Continuing to judge whether b+k Ph is greater than Pfl,
When the judgment is (b.pm+k.ph=7.5 > pfl=7), i=1 is given to judge whether the fluctuation range is larger than 15%,
Judging whether Pin-i pi-j Pm-k Ph is larger than 0.05 pi or not (fluctuation amplitude is larger than 15%), judging whether Pin-i pi-j pi-k Ph is larger than 0.05 pi,
Judging whether (Pin-i pi-j Pm-k Ph= -1 to-0.3 < 0.05 pi=0.025), and continuously judging whether the current Pin-i pi-j Pm-k Ph is smaller than-0.95 pi or not, wherein:
If Pin-i pi-j Pm-k Ph = -0.475 to-0.3, i=1, continuing to return to the judgment,
If Pin-i pi-j Pm-k Ph = -1 to-0.475, i=i-1=0, judging whether the load fluctuation amplitude is larger than 15%,
If the load fluctuation range is more than 15 percent, the judgment is continued, the startup of the PEM electrolytic cell is realized,
If not (load fluctuation width is less than 15%), the flow returns to the start 1, and the above-described flow is performed.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (9)
1. A combined start-stop control method for a multi-class multi-electrolytic tank is characterized by comprising the following steps:
When the combination of the multi-class multi-electrolytic cells starts to work, the number a and rated power Pl of the low-power electrolytic cells, the number b and rated power Pm of the medium-power electrolytic cells, the number c and rated power Ph of the high-power electrolytic cells are respectively collected, and the input power Pin of the green energy is obtained;
step 2, based on the comparison and judgment of the input power Pin of the green energy and the total rated power of the low-power electrolytic cell, the medium-power electrolytic cell and the high-power electrolytic cell, the start-stop control is carried out on the combination of multiple types of multiple electrolytic cells; wherein, the lower limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfl, and the upper limit value of the input power fluctuation range of the input power Pin of the green energy source is Pfh, at this time:
Judgment control 1: if the input power Pin is smaller than or equal to the rated power a Pl of all the low-power electrolytic cells, the start-stop control of the low-power electrolytic cell group is carried out;
judgment control 2: if the input power Pin is greater than the rated power a pi of all low-power electrolytic cells and is less than or equal to the rated power sum a pi+b Pm of all low-power electrolytic cells and all medium-power electrolytic cells, the start-stop control of the combination of the low-power electrolytic cells and the medium-power electrolytic cells is carried out;
judgment control 3: if the input power Pin is larger than the rated power sum a Pl+b Pm of all low-power electrolytic cells and all medium-power electrolytic cells, the start-stop control of the combination of the low-power electrolytic cells, the medium-power electrolytic cells and the high-power electrolytic cells is carried out;
The method for performing start-stop control of the combination of the low-power electrolytic tank and the medium-power electrolytic tank according to the judgment control 2 comprises the following steps:
judgment control 2.1: if the fluctuation amplitude of the load is less than or equal to 15%, starting all the low-power electrolytic cells, and starting and stopping the medium-power electrolytic cells; meanwhile, calculating a power difference B=Pin-a Pl-j Pm, and controlling the starting and the closing of the power electrolytic tank in the numerical range according to the power difference B; wherein j is the starting number of the medium-power electrolytic cells;
Judgment control 2.2: if the fluctuation range of the load is more than 15%, the load of the medium-low power electrolytic cell is adjusted;
the method for judging and controlling the load adjustment of the medium-low power electrolytic tank in 2.2 comprises the following steps:
Starting j medium power electrolytic cells, and controlling the starting and closing of the low power electrolytic cells and the medium power electrolytic cells according to the relation between the total rated power j of the started medium power electrolytic cells and the lower limit value Pfl of the fluctuation range;
The method for controlling the starting and closing of the low-power electrolytic cell and the medium-power electrolytic cell according to the relation between the total rated power j of the started medium-power electrolytic cell and the lower limit value Pfl of the fluctuation range comprises the following steps:
Judging and controlling 2.2.1 when j is less than or equal to Pfl, starting a new medium power electrolytic tank, calculating the total rated power (j+1) Pm of the new started medium power electrolytic tank, and if (j+1) Pm is still less than or equal to Pfl, continuing to start the new medium power electrolytic tank until (j+n) Pm is more than Pfl and (j+n) is less than or equal to b;
judging and controlling 2.2.2 when j is greater than Pfl, starting a low-power electrolytic tank, judging whether the current load fluctuation amplitude is less than or equal to 15%, and continuing to judge and control as follows:
judging that the control is 2.2.2.1, if the current load fluctuation amplitude is less than or equal to 15%, re-entering the step 2;
Judging and controlling 2.2.2.2, if the current load fluctuation amplitude is more than 15%, and Pin-i Pl-j Pm is more than 0.05 Pl, returning to judging and controlling 2.2.2, restarting a low-power electrolytic cell, and judging whether the current load fluctuation amplitude is less than or equal to 15%; wherein i is the number of starts of the low power electrolytic cells;
Judging that the control 2.2.2.3 maintains to start the i low-power electrolytic cells and the j medium-power electrolytic cells currently if the current load fluctuation amplitude is more than 15% and minus 0.95 pi is less than or equal to Pin-i pi-j Pm is less than or equal to 0.05 pi, and re-entering the step 2 after Pin is updated;
judging control 2.2.2.4 if the current load fluctuation amplitude is greater than 15%, and Pin-i Pl-j Pm < -0.95 Pl, closing a low-power electrolytic cell, returning to judging control 2.2.2, and judging whether the current load fluctuation amplitude is less than or equal to 15%; where i is the number of starts of the low power cells and j is the number of starts of the medium power cells.
2. The combined start-stop control method of multiple electrolytic cells according to claim 1, wherein the low power electrolytic cell is a PEM electrolytic cell, the medium power electrolytic cell and the high power electrolytic cell are both alkaline lye electrolytic cells, and the rated power Ph of the high power electrolytic cell is greater than the rated power Pm of the medium power electrolytic cell is greater than the rated power Pl of the PEM electrolytic cell.
3. The method for controlling the start-stop of the combination of the multiple electrolytic cells according to claim 1, wherein the method for controlling the start-stop of the low-power electrolytic cell group according to the judgment control 1 comprises the following steps:
After starting i low power PEM cells, the power difference a=pin-i pi is calculated and the start and shut down of the low power cells are controlled according to the range of values of the power difference a.
4. A combined start-stop control method for a multi-class, multi-electrolyzer according to claim 3 characterized in that the method for controlling the start-up and shut-down of a low power electrolyzer according to the numerical range of power difference a comprises:
Judgment control 1.1: when the power difference A is more than 0.05 xPl, starting a new low-power electrolytic cell, simultaneously calculating a new power difference A=Pin- (i+1) pPl, and controlling the starting and the closing of the low-power electrolytic cell according to the numerical range of the new power difference A; if the starting number i of the low-power electrolytic cells reaches the number a of the low-power electrolytic cells, re-entering the step 2;
Judgment control 1.2: when the power difference A < -0.95 Pl, closing a low-power electrolytic cell, simultaneously calculating a new power difference A=Pin- (i-1) Pl, and controlling the starting and closing of the low-power electrolytic cell according to the numerical range of the new power difference A; if all the low power electrolytic cells are closed, re-entering step 2;
judgment control 1.3: when the power difference A is less than or equal to-0.95 Pl and less than or equal to 0.05 Pl, maintaining the current starting of i low-power electrolytic cells unchanged, recalculating the power difference A when Pin is updated, and controlling the starting and the closing of the low-power electrolytic cells according to the numerical range of the power difference A.
5. The method for controlling the start-up and shut-down of a combination of multiple electrolytic cells according to claim 1, wherein the method for controlling the start-up and shut-down of the power electrolytic cells in the numerical range control according to the power difference B according to the judgment control 2.1 comprises:
Judgment control 2.1.1: when the power difference B is more than 0.3 Pm, starting a new medium-power electrolytic tank, simultaneously calculating a new power difference B=Pin-a Pl- (j+1) Pm, and controlling the starting and the closing of the medium-power electrolytic tank according to the numerical range of the new power difference B; if the starting number j of the medium power electrolytic cells reaches the number b of the medium power electrolytic cells, re-entering the step 2;
judgment control 2.1.2: when the power difference B < -0.7 XPm, closing a middle power electrolytic tank, simultaneously calculating a new power difference B=Pin-a Pl- (j-1) Pm, and controlling the starting and closing of the middle power electrolytic tank according to the numerical range of the new power difference B; if all the medium power electrolytic tanks are closed, re-entering the step 2;
Judgment control 2.1.3: when the power difference B is less than or equal to-0.7 and less than or equal to 0.3, maintaining the power of the low power electrolytic cells a and the power of the medium power electrolytic cells j to be unchanged at present, recalculating the power difference B when Pin is updated, and controlling the starting and the closing of the medium power electrolytic cells according to the numerical range of the power difference B.
6. The method for controlling the combined start-stop of a multi-class multi-cell according to claim 1, wherein the method for controlling the start-stop of a combination of a low power cell, a medium power cell and a high power cell according to decision control 3 comprises:
Judgment control 3.1: if the fluctuation amplitude of the load is less than or equal to 15%, starting all the low-power electrolytic cells and the medium-power electrolytic cells, and starting and stopping the high-power electrolytic cells; meanwhile, calculating a power difference C=Pin-a Pl-b Pm-k Ph, and controlling the starting and closing of the high-power electrolytic tank according to the numerical range of the power difference C; wherein k is the number of starts of the high-power electrolytic cells;
judgment control 3.2: and if the load fluctuation amplitude is more than 15%, carrying out high-middle-low power electrolytic tank load adjustment.
7. The method for controlling the start-up and shut-down of a multi-class multi-cell combination according to claim 6, wherein the method for controlling the start-up and shut-down of a high-power cell according to the numerical range of the power difference C according to the judgment control 3.1 comprises:
Judgment control 3.1.1: when the power difference C is more than 0.3 x Ph, starting a new high-power electrolytic tank, simultaneously calculating a new power difference C=Pin-a Pl-b Pm- (k+1) Ph, and controlling the starting and the closing of the high-power electrolytic tank according to the numerical range of the new power difference C; if the starting number k of the high-power electrolytic cells reaches the number c of the high-power electrolytic cells, re-entering the step 2;
Judgment control 3.1.2: when the power difference C < -0.7 x Ph, closing a high-power electrolytic tank, simultaneously calculating a new power difference C=Pin-a Pl-b Pm- (k-1) Ph, and controlling the starting and closing of the high-power electrolytic tank according to the numerical range of the new power difference C; if all the high-power electrolytic tanks are closed, re-entering the step 2;
Judgment control 3.1.3: when the power difference C is less than or equal to-0.7 and less than or equal to 0.3, the current starting of a low-power electrolytic cells, b medium-power electrolytic cells and k high-power electrolytic cells is maintained unchanged, the power difference C is recalculated when Pin is updated, and the starting and the closing of the high-power electrolytic cells are controlled according to the numerical range of the power difference C.
8. The method for controlling the combined start-stop of the multiple electrolytic cells in multiple categories according to claim 6, wherein the method for judging and controlling the load adjustment of the high-middle-low power electrolytic cell in 3.2 comprises the following steps:
Starting b medium-power electrolytic cells and k high-power electrolytic cells, and controlling the starting and the closing of the low-power electrolytic cells and the high-power electrolytic cells according to the relation between the total rated power b+pm+k Ph of the started high-power electrolytic cells and the lower limit value Pfl of the fluctuation range.
9. The combined start-stop control method for a multi-class, multi-cell according to claim 8, wherein the method for controlling the start-up and shut-down of the low power cell and the high power cell according to the relation between the total rated power b+pm+k Ph of the started high power cell and the lower limit value Pfl of the fluctuation range comprises:
Judging and controlling 3.2.1 when b is pm+k is Ph less than or equal to Pfl, starting a new high-power electrolytic cell, calculating the total rated power b is pm+ (k+1) Ph of the new started medium-power electrolytic cell and high-power electrolytic cell, and continuing to start the new high-power electrolytic cell until b is pm+ (k+m) Ph > Pfl and (k+m) is less than or equal to Pfl if b is pm+ (k+1) Ph still less than or equal to Pfl;
3.2.2, when b+k+Ph > Pfl, starting a low-power electrolytic cell, judging whether the current load fluctuation amplitude is less than or equal to 15%, and continuing to perform the following judgment control:
Judging that the control is 3.2.2.1, if the current load fluctuation amplitude is less than or equal to 15%, re-entering the step 2;
Judging and controlling 3.2.2.2, if the current load fluctuation amplitude is larger than 15%, and Pin-i pi-b Pm-k Ph is larger than 0.05 pi, returning to judging and controlling 2.2.2, restarting a low-power electrolytic cell, and judging whether the current load fluctuation amplitude is smaller than or equal to 15%; wherein i is the starting number of the low-power electrolytic cells, k is the starting number of the high-power electrolytic cells, and b medium-power electrolytic cells are all started;
judging and controlling 3.2.2.3 if the current load fluctuation amplitude is more than 15%, and-0.95 Pl is less than or equal to Pin-i Pl-b Pm-k Ph is less than or equal to 0.05 Pl, maintaining the current starting of all of i low-power electrolytic cells, k high-power electrolytic cells and b medium-power electrolytic cells, and re-entering the step 2 after Pin is updated;
Judging control 3.2.2.4 if the current load fluctuation amplitude is greater than 15%, and Pin-i Pl-b Pm-k Ph < -0.95 Pl, closing a low-power electrolytic cell, returning to judging control 3.2.2, and judging whether the current load fluctuation amplitude is less than or equal to 15%; wherein i is the starting number of the low-power electrolytic cells, k is the starting number of the high-power electrolytic cells, and b medium-power electrolytic cells are all started.
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| CN108517533A (en) * | 2018-03-26 | 2018-09-11 | 全球能源互联网研究院有限公司 | A kind of electrolytic hydrogen production control method and device |
| CN116575075A (en) * | 2023-05-08 | 2023-08-11 | 上海舜华新能源系统有限公司 | High-precision control strategy for hydrogen production of alkaline water electrolysis tank |
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| CN108517533A (en) * | 2018-03-26 | 2018-09-11 | 全球能源互联网研究院有限公司 | A kind of electrolytic hydrogen production control method and device |
| CN116575075A (en) * | 2023-05-08 | 2023-08-11 | 上海舜华新能源系统有限公司 | High-precision control strategy for hydrogen production of alkaline water electrolysis tank |
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