CN108879745B - Comprehensive power generation system and method for improving unit peak regulation economy - Google Patents
Comprehensive power generation system and method for improving unit peak regulation economy Download PDFInfo
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- CN108879745B CN108879745B CN201811064334.XA CN201811064334A CN108879745B CN 108879745 B CN108879745 B CN 108879745B CN 201811064334 A CN201811064334 A CN 201811064334A CN 108879745 B CN108879745 B CN 108879745B
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- 238000010248 power generation Methods 0.000 title claims abstract description 183
- 238000000034 method Methods 0.000 title claims abstract description 7
- 238000004146 energy storage Methods 0.000 claims abstract description 109
- 238000007599 discharging Methods 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000001174 ascending effect Effects 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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Abstract
According to the comprehensive power generation system and the method for improving the peak regulation economy of the unit, the thermal power generation unit of the comprehensive power generation system is connected with the comprehensive power generation system controller through the thermal power unit controller, the energy storage power generation system is connected with the comprehensive power generation system controller through the energy storage system controller, the comprehensive power generation system controller receives the power grid dispatching instruction source sent by the power grid to control the operation conditions of the thermal power generation unit and the energy storage power generation system, the thermal power unit and the energy storage power generation system supply power for the power grid simultaneously or the thermal power generation unit is used for supplying power for the power grid when the thermal power generation unit needs to be in ascending load operation, the load stored by the energy storage power generation system is used for realizing the peak-valley load transfer of the thermal power generation unit, the resource waste is avoided, the economy of the unit is improved, and the carbon emission of the generated energy of the unit is reduced.
Description
Technical Field
The invention relates to a new energy power grid system, in particular to a comprehensive power generation system and method for improving unit peak regulation economy.
Background
After a large amount of renewable energy sources are connected into a power grid, because of the intermittence and uncertainty of renewable energy sources such as wind power, photovoltaic power sources and the like and the requirement of load stability at the power utilization side, the power grid needs to carry out peak regulation operation through generating electricity of units such as thermal power, hydroelectric power and the like so as to maintain the safety of the power grid and the stability of a power system.
At present, thermal power units serving as main peak shaving units in a power grid perform deep peak shaving operation more. And the economic performance of the unit is reduced and the power supply coal consumption is increased due to the deep peak regulation operation of the unit. The performance test results of some deep peak shaving units show that when deep peak shaving is performed, the unit power supply coal consumption is increased by 70-100g/kWh compared with the power supply coal consumption under the economic operation load of the unit, and the increase of the power supply coal consumption increases the carbon emission of unit power generation. When the thermal power unit is in deep peak-shaving operation, the input switching of main auxiliary machines is involved, and when the thermal power unit is in deep peak-shaving operation, the variable load operation performance of the thermal power unit is different from the AGC requirement of a power grid, and the AGC regulation performance cannot meet the requirement, so that the examined cost is high, and the economy of the variable load operation of the thermal power unit is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a comprehensive power generation system and a method for improving the peak shaving economy of a unit so as to improve the economy of the peak shaving operation of the unit.
The invention adopts the following scheme to realize the purpose:
a comprehensive power generation system for improving the peak regulation economy of a unit comprises a thermal power generation unit, an energy storage power generation system, a comprehensive power generation system controller, a thermal power unit controller and an energy storage system controller;
the thermal power generating unit is connected with the comprehensive power generating system controller through the thermal power generating unit controller, the energy storage power generating system is connected with the comprehensive power generating system controller through the energy storage system controller, the comprehensive power generating system controller is used for receiving a power grid dispatching instruction source sent by a power grid and sending control instructions to the thermal power generating unit controller and the energy storage system controller according to the power grid dispatching instruction source, and the thermal power generating unit controller and the energy storage system controller are used for executing the control instructions sent by the comprehensive power generating system controller and controlling the running conditions of the thermal power generating unit and the energy storage power generating system;
the outgoing line of the thermal generator set is connected with an outgoing bus through a switch and a transformer, the outgoing line of the energy storage power generation system is connected with the outgoing bus through another switch and a transformer, the outgoing bus is connected with a power grid, and the outgoing line of the thermal generator set is connected with the incoming line of the energy storage power generation system through a third switch and a second transformer.
Further, the energy storage power generation system consists of a chargeable and dischargeable battery assembly, a hydrogen production and fuel battery pack, a compressed air energy storage unit, an electric car parking lot charge and discharge system and a power generation system.
Further, the energy storage power generation system consists of a chargeable and dischargeable battery assembly, a hydrogen production and fuel battery pack, a compressed air energy storage unit, an electric car parking lot charging and discharging system and a gas power generation system using compressed air.
Further, the battery assembly-, the hydrogen production and fuel battery pack-, the compressed air energy storage unit-and the electric car parking lot charging and discharging system are respectively connected with the energy storage and power generation system inlet wire through a fourth switch, and meanwhile, the battery assembly-, the hydrogen production and fuel battery pack-, the compressed air energy storage unit-and the electric car parking lot charging and discharging system are respectively connected with the energy storage and power generation system outlet wire through a fifth switch.
Further, the outgoing line of the thermal generator set is connected with an outgoing line bus through a first switch, a first transformer and a second switch in sequence, the outgoing line of the energy storage power generation system is connected with the outgoing line bus through a sixth switch, a third transformer and a seventh switch in sequence, the outgoing line bus is connected with a power grid, and the outgoing line of the thermal generator set is connected with the incoming line of the energy storage power generation system through the third switch and the second transformer.
Further, the outgoing bus is connected to a power grid through a switch.
After the comprehensive power generation system receives a thermal power generation unit load reduction and deep peak regulation operation instruction sent by a comprehensive power generation system controller, the comprehensive power generation system sends redundant load of the thermal power generation unit to an energy storage power generation system according to the storable load capacity of the energy storage power generation system, so that the energy storage power generation system is charged, the thermal power generation unit keeps high-load operation, and the system load output by the comprehensive power generation system is consistent with an electric network AGC instruction;
when the comprehensive power generation system receives a thermal power generation unit load lifting operation instruction, according to the thermal power generation unit load lifting characteristic, the thermal power generation unit is enabled to lift load according to the thermal power generation unit load lifting characteristic, meanwhile, the difference between the power grid AGC instruction and the thermal power generation unit load lifting operation characteristic is used as a power generation instruction of the energy storage power generation system, and the energy storage power generation system is enabled to operate to the power grid for power generation; and when the peak load of the power grid and the thermal generator set are already in the economic operation load, the energy storage power generation system is enabled to continuously generate power to the power grid, and an energy storage space is reserved for the system.
The invention has the following beneficial effects:
according to the comprehensive power generation system, the thermal power generating unit is connected with the comprehensive power generation system controller through the thermal power generating unit controller, the energy storage power generation system is connected with the comprehensive power generation system controller through the energy storage system controller, the comprehensive power generation system controller receives a power grid dispatching instruction source sent by a power grid to control the operation conditions of the thermal power generating unit and the energy storage power generation system, the thermal power generating unit and the energy storage power generation system supply power to the power grid simultaneously or the thermal power generating unit is used for supplying power to the power grid independently, and surplus load of the thermal power generating unit is stored in the energy storage power generation system for later use, and the load stored by the energy storage power generation system is used for supplying power to the power grid when the thermal power generating unit needs to be in load lifting operation, so that the peak-valley load transfer of the thermal power generating unit is realized, the resource waste is avoided, the economy of the unit is improved, and the carbon emission of unit power generation is reduced.
According to the comprehensive power generation method, when the thermal generator set of the comprehensive power generation system is in load reduction operation, the redundant load of the thermal generator set is sent to the energy storage power generation system, so that the energy storage power generation system is charged, the higher operation load of the thermal generator set is kept, the actual load of the thermal generator set is improved, the thermal generator set is prevented from discharging redundant steam due to sudden load drop, the economy of the set is improved, and meanwhile, the system load output by the comprehensive power generation system is kept consistent with an AGC instruction of a power grid, and the deep peak regulation operation requirement is met.
When the comprehensive power generation system receives the rising load of the thermal power generation unit, the thermal power generation unit and the energy storage power generation system generate power to the power grid at the same time, when the peak load of the power grid and the thermal power generation unit are already in economic operation load, the energy storage power generation system continues to generate power to the power grid, reserves energy storage space for the system, increases the output of the thermal power generation unit during deep peak shaving while meeting the AGC requirement of the power grid on the unit, and supplies power to the power grid when the peak load of the power grid is required, so that the space-time transfer of the load of the thermal power generation unit is realized, the economy is improved, and the carbon emission of unit generated energy is reduced.
Drawings
FIG. 1 is a schematic diagram of a comprehensive power generation system according to the present invention
In the figure: 1-a thermal generator set; 2-an energy storage power generation system; 2-1-battery assembly; 2-2-hydrogen production and fuel cell stacks; 2-3-compressed air energy storage units; 2-4-charging and discharging systems of electric automobile parking lots; 3-a first switch; 4-a first transformer; 5-a second switch; 6-an outgoing bus; 7-a third switch; 8-a second transformer; 9-fourth switch; 10-a fifth switch; 11-sixth switches; 12-a third transformer; 13-seventh switch; 14-a power grid dispatching instruction source; 15-a comprehensive power generation system controller; a 16-thermal power generating unit controller; 17-energy storage system controller.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
As shown in fig. 1, the integrated power generation system of the present invention is composed of a thermal power generation unit 1 and an energy storage power generation system 2.
The thermal power generating unit 1 is connected with the comprehensive power generating system controller 15 through the thermal power generating unit controller 16, the energy storage power generating system 2 is connected with the comprehensive power generating system controller 15 through the energy storage system controller 17, the comprehensive power generating system controller 15 is used for receiving a power grid dispatching instruction source 14 sent by a power grid and sending control instructions to the thermal power generating unit controller 16 and the energy storage system controller 17 according to the power grid dispatching instruction source 14, and the thermal power generating unit controller 16 and the energy storage system controller 17 are used for executing the control instructions sent by the comprehensive power generating system controller 15 and controlling the running conditions of the thermal power generating unit 1 and the energy storage power generating system 2.
The outgoing line of the thermal generator set 1 is connected with an outgoing line bus 6 through a first switch 3, a first transformer 4 and a second switch 5, the outgoing line of the energy storage power generation system 2 is connected with the outgoing line bus 6 through a sixth switch 11, a third transformer 12 and a seventh switch 13, the outgoing line bus 6 is connected to a power grid through a switch, and the outgoing line of the thermal generator set 1 and the incoming line of the energy storage power generation system 2 are connected through a third switch 7 and a second transformer 8.
The energy storage power generation system 2 can be composed of a chargeable and dischargeable battery assembly 2-1, a hydrogen production and fuel battery pack 2-2, a compressed air energy storage unit 2-3 and a power generation system, or a gas power generation system capable of using compressed air, and also can be a unit direct supply type electric car parking lot charging and discharging system 2-4.
The battery assembly 2-1, the hydrogen production and fuel cell set 2-2, the compressed air energy storage unit 2-3 and the electric car parking lot charging and discharging system 2-4 are respectively connected with an incoming line of the energy storage power generation system 2 through a fourth switch 9, and meanwhile, the battery assembly 2-1, the hydrogen production and fuel cell set 2-2, the compressed air energy storage unit 2-3 and the electric car parking lot charging and discharging system 2-4 are respectively connected with an outgoing line of the energy storage power generation system 2 through a fifth switch 10.
The working principle of the comprehensive power generation system of the invention is as follows:
after the comprehensive power generation system receives the load-reducing and deep peak regulation operation instructions of the thermal power generation unit 1 sent by the comprehensive power generation system controller 15, the comprehensive power generation system sends redundant loads of the thermal power generation unit 1 to the energy storage power generation system 2 according to the storable load capacity of the energy storage power generation system 2, so that the energy storage power generation system 2 is charged, the higher operation load of the thermal power generation unit 1 is kept, the economy of the unit is improved, and meanwhile, the system load output by the comprehensive power generation system is kept consistent with the power grid AGC instruction, and the deep peak regulation operation requirement is met.
When the comprehensive power generation system receives a load operation instruction of the thermal power generation unit 1 liter, the thermal power generation unit 1 is enabled to be loaded according to the load characteristic of the thermal power generation unit 1 liter, meanwhile, the difference between the AGC instruction of the power grid and the load operation characteristic of the thermal power generation unit 1 liter is used as a power generation instruction of the energy storage power generation system 2, and the energy storage power generation system 2 is enabled to operate to the power grid for power generation. And when the peak load of the power grid and the thermal generator set 1 are already in the economic operation load, the energy storage power generation system 2 is enabled to continue to generate power to the power grid, and an energy storage space is reserved for the system. By the mode, the output of the thermal generator set is increased when the AGC requirement of the power grid on the unit is met, the energy storage power generation system 2 supplies power to the power grid when the power grid is in peak load demand, so that the space-time transfer of the load of the thermal generator set 1 is realized, the economy is improved, and the carbon emission of unit generated energy is reduced.
The comprehensive power generation system mainly comprises the following operation modes:
mode one: when the power grid dispatching instruction source 14 received by the comprehensive power generation system controller 15 requires the unit load to be in a high-load interval of economic operation of the unit, the thermal generator unit 1 operates, and the generated power is sent to the outlet bus 6 through the first switch 3, the first transformer 4 and the second switch 5 to supply power to the power grid.
Mode two: when the power grid dispatching instruction source 14 requires the load of the comprehensive power generation system unit to be in the unit deep peak load regulation interval, the thermal power generation unit 1 operates, and the generated energy is sent to the outgoing bus 6 through the first switch 3, the first transformer 4 and the second switch 5 to supply power to the power grid.
Mode three: when the load demand goes to the valley, the power grid dispatching instruction source 14 requires that the load of the comprehensive power generation system unit is in the unit depth peak load regulation interval, the comprehensive power generation system controller 15 decomposes the load control instruction according to the operation characteristic of the thermal power generation unit 1 and the actual energy storage capacity of the energy storage power generation system 2, so that the actual load of the operation of the thermal power generation unit 1 is as follows: the grid dispatching command source 14 requires the load + stores the load to the energy storage power generation system 2. At this time, the thermal generator set 1 supplies the generated energy to the outlet bus 6 through the first switch 3, the first transformer 4 and the second switch 5 to supply the electric quantity required by the power grid dispatching command source 14 to the power grid, and simultaneously supplies power to the energy storage power generation system 2 through the third switch 7 and the second transformer 8, so that the actual load of the operation of the thermal generator set 1 is improved, and the carbon emission of the unit generated energy is reduced.
Mode four: when the power grid load goes out of the valley, the power grid load rises and starts to run to peak load, the comprehensive power generation system controller 15 can properly decompose the unit load, the energy storage power generation system 2 generates power through the energy storage system controller 17, power is supplied to the outgoing bus 6 through the sixth switch 11, the third transformer 12 and the seventh switch 13, meanwhile, the thermal power generation unit controller 16 properly controls the load of the thermal power generation unit 1, so that the thermal power generation unit and the energy storage power generation system 2 generate power together, and the power grid dispatching instruction source 14 is jointly realized, so that the unit peak-valley load transfer of the thermal power generation unit 1 is realized, the economy of the unit is improved, and the carbon emission of unit generated energy is reduced.
Mode five: when the power grid dispatching command source 14 sends out the AGC load reduction command, the comprehensive power generation system controller 15 compares the operation characteristic of the thermal generator set 1 with the AGC load reduction command curve, decomposes the load control command according to the operation characteristic of the thermal generator set 1 and the energy storage actual energy storage capacity of the energy storage power generation system 2, enables the thermal generator set 1 to operate according to the load reduction characteristic curve of the set, and supplies power to the energy storage power generation system 2 through the third switch 7 and the second transformer 8 in the load part exceeding the AGC load reduction command curve, thereby avoiding the discharge of redundant steam caused by sudden load reduction of the thermal generator set 1 and achieving the energy saving purpose.
Mode six: when the power grid dispatching command source 14 sends out an AGC load-increasing command, the comprehensive power generation system controller 15 compares the operation characteristic of the thermal power generation unit 1 with an AGC load-decreasing command curve, decomposes a thermal power generation unit control command and an energy storage system control command according to the operation characteristic of the thermal power generation unit 1 and the energy storage practical energy storage capacity of the energy storage power generation system 2, enables the thermal power generation unit 1 to operate according to the unit load-increasing characteristic curve through the thermal power generation unit controller 16, forms an energy storage system control command with the differential load part of the AGC load-increasing command curve, enables the energy storage power generation system 2 to generate electricity through the energy storage system controller 17, and supplies electricity to the outgoing bus 6 through the sixth switch 11, the third transformer 12 and the seventh switch 13, and jointly realizes the AGC load-increasing command of the power grid dispatching command source 14 with the thermal power generation unit 1, so that the loss to be checked due to the fact that the AGC load-increasing command is not met is avoided.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which are intended to be covered by the scope of the claims.
Claims (1)
1. A comprehensive power generation method of a comprehensive power generation system for improving the peak regulation economy of a unit is characterized by comprising the following steps of:
the comprehensive power generation system comprises a thermal power generation unit (1), an energy storage power generation system (2), a comprehensive power generation system controller (15), a thermal power unit controller (16) and an energy storage system controller (17);
the thermal power generation unit (1) is connected with the comprehensive power generation system controller (15) through the thermal power generation unit controller (16), the energy storage power generation system (2) is connected with the comprehensive power generation system controller (15) through the energy storage system controller (17), the comprehensive power generation system controller (15) is used for receiving a power grid dispatching instruction source (14) sent by a power grid and sending control instructions to the thermal power generation unit controller (16) and the energy storage system controller (17) according to the power grid dispatching instruction source (14), and the thermal power generation unit controller (16) and the energy storage system controller (17) are used for executing the control instructions sent by the comprehensive power generation system controller (15) and controlling the running conditions of the thermal power generation unit (1) and the energy storage power generation system (2);
the outgoing line of the thermal generator set (1) is connected with an outgoing line bus (6) through a switch and a transformer, the outgoing line of the energy storage power generation system (2) is connected with the outgoing line bus (6) through another switch and a transformer, the outgoing line bus (6) is connected with a power grid, and the outgoing line of the thermal generator set (1) is connected with the incoming line of the energy storage power generation system (2) through a third switch (7) and a second transformer (8);
the energy storage power generation system (2) consists of a chargeable and dischargeable battery assembly (2-1), a hydrogen production and fuel battery pack (2-2), a compressed air energy storage unit (2-3), an electric automobile parking lot charging and discharging system (2-4) and a gas power generation system using compressed air;
when the comprehensive power generation system is connected to a thermal power generation set (1) load reduction and deep peak regulation operation instruction which is required to be sent by a comprehensive power generation system controller (15) according to a power grid dispatching instruction source (14), the comprehensive power generation system sends redundant load of the thermal power generation set (1) to an energy storage power generation system (2) according to storable load capacity of the energy storage power generation system (2), so that the energy storage power generation system (2) is charged, the thermal power generation set (1) keeps high-load operation, and system load output by the comprehensive power generation system is consistent with a power grid AGC instruction;
when the comprehensive power generation system is connected to a comprehensive power generation system controller (15) and requires a thermal generator set (1) to lift a load operation instruction according to a power grid dispatching instruction source (14), the thermal generator set (1) lifts a load according to the self operation characteristic of the thermal generator set (1), and meanwhile, the difference between the power grid AGC instruction and the self load lifting operation characteristic of the thermal generator set (1) is used as a power generation instruction of an energy storage power generation system (2), so that the energy storage power generation system (2) operates to a power grid to generate power; when the peak load of the power grid and the thermal generator set (1) are already in the economic operation load, the energy storage power generation system (2) is enabled to continuously generate power to the power grid, and an energy storage space is reserved for the system;
the battery assembly (2-1), the hydrogen production and fuel battery pack (2-2), the compressed air energy storage unit (2-3) and the electric car parking lot charging and discharging system (2-4) are respectively connected with an incoming line of the energy storage power generation system (2) through a fourth switch (9), and meanwhile, the battery assembly (2-1), the hydrogen production and fuel battery pack (2-2), the compressed air energy storage unit (2-3) and the electric car parking lot charging and discharging system (2-4) are respectively connected with an outgoing line of the energy storage power generation system (2) through a fifth switch (10);
the outgoing line of the thermal generator set (1) is connected with an outgoing line bus (6) through a first switch (3), a first transformer (4) and a second switch (5), the outgoing line of the energy storage power generation system (2) is connected with the outgoing line bus (6) through a sixth switch (11), a third transformer (12) and a seventh switch (13), the outgoing line bus (6) is connected with a power grid, and the outgoing line of the thermal generator set (1) is connected with the incoming line of the energy storage power generation system (2) through a third switch (7) and a second transformer (8);
the outgoing bus (6) is connected to a power grid through a switch.
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| CN111162530B (en) * | 2020-01-14 | 2023-09-19 | 北京金茂绿建科技有限公司 | Power access system for generator outlet to access peak shaving facility |
| CN111271143A (en) * | 2020-03-20 | 2020-06-12 | 西安西热节能技术有限公司 | System and method for improving electric power flexibility |
| CN113162068A (en) * | 2021-04-08 | 2021-07-23 | 深圳供电局有限公司 | Energy storage system and peak-shaving frequency modulation system |
| CN113300389A (en) * | 2021-05-28 | 2021-08-24 | 中国科学院理化技术研究所 | Hybrid energy firepower peak regulation power station and peak regulation method |
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