CN110601241A - Energy storage power station direct current loop topology system - Google Patents
Energy storage power station direct current loop topology system Download PDFInfo
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- CN110601241A CN110601241A CN201910996805.9A CN201910996805A CN110601241A CN 110601241 A CN110601241 A CN 110601241A CN 201910996805 A CN201910996805 A CN 201910996805A CN 110601241 A CN110601241 A CN 110601241A
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a direct-current loop topological system of an energy storage power station, which relates to a direct-current loop topological system and solves the problem that the reliability of the system is seriously influenced because live-line switching exists in the switching process of charging and discharging relays, the mutual impact exists between battery packs, and the frequent switching is needed in any process. The invention adopts the independent charging loop and the independent discharging loop, the two independent loops can work independently at the same time without influencing each other, the mutual charging and discharging of the battery pack is avoided, because the charging relay and the discharging relay only work at the charging over limit and the discharging over limit, and the other processes do not work, the working times of the relay are greatly reduced, and the reliability of the system is improved.
Description
Technical Field
The invention relates to a direct current loop topology system, in particular to a direct current loop topology system of an energy storage power station.
Background
In the prior energy storage topological system, the charging state or the discharging system has no inevitable problems in control.
The charging and discharging relays are switched in a live mode in the switching process, mutual impact among battery packs exists, and frequent switching is needed in any process, so that the reliability of the system is seriously influenced.
Disclosure of Invention
The invention aims to provide an energy storage power station direct-current circuit topology system which adopts an independent charging loop and an independent discharging loop, and the two independent loops can work independently and simultaneously without mutual influence.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides an energy storage power station direct current loop topology system, includes controller, charger, dc-to-ac converter, battery management system group, group battery operating switch, charging relay group, discharging relay group, charging diode group, discharging diode group, group battery and reposition of redundant personnel group, controller and battery management system group be connected, the charger be connected with charging relay group, the dc-to-ac converter be connected with discharging relay group, charging relay group be connected with charging diode group, discharging relay group be connected with discharging diode group, the group battery be connected with charging relay group and discharging relay group respectively, battery management system group be connected with reposition of redundant personnel group.
Through adopting above-mentioned technical scheme, realized independent charge circuit and discharge circuit through above relation of connection, two independent circuits can independently work each other independently simultaneously, avoid the group battery point to charge each other, discharge, because charge relay and discharge relay only in charge the limit and discharge the limit action, thereby the relay number of times that does not all move significantly reduces in other processes, has improved the reliability of system.
The invention is further configured to: the battery management system group comprises a first battery management system, a second battery management system, a third battery management system and a fourth battery management system, the battery pack working switch comprises a first battery pack working switch, a second battery pack working switch, a third battery pack working switch and a fourth battery pack working switch, the charging relay group comprises a first charging relay, a second charging relay, a third charging relay and a fourth charging relay, the discharging relay group comprises a first discharging relay, a second discharging relay, a third discharging relay and a fourth discharging relay, the charging diode group comprises a first charging diode, a second charging diode, a third charging diode and a fourth charging diode, the discharging diode group comprises a first discharging diode, a second discharging diode, a third discharging diode and a fourth discharging diode, the battery pack comprises a first battery, a second battery, a third battery and a fourth battery, the shunt group comprises a first shunt, a second shunt, a third shunt and a fourth shunt, and the battery pack working switch is connected with the charger;
the first battery management system is respectively connected with a first charging relay and a first discharging relay, the first charging relay is connected with a first charging diode, the first discharging relay is connected with a first discharging diode, the first battery is respectively connected with the first charging diode and the first discharging diode, and the first current divider is connected with a first battery pack working switch;
the second battery management system is respectively connected with a second charging relay and a second discharging relay, the second charging relay is connected with a second charging diode, the second discharging relay is connected with a second discharging diode, the second battery is respectively connected with a second charging diode and a second discharging diode, and the second shunt is connected with a second battery pack working switch;
the third battery management system is respectively connected with a third charging relay and a third discharging relay, the third charging relay is connected with a third charging diode, the third discharging relay is connected with a third discharging diode, the third battery is respectively connected with a third charging diode and a third discharging diode, and the third current divider is connected with a third battery pack working switch;
the fourth battery management system is respectively connected with a fourth charging relay and a fourth discharging relay, the fourth charging relay is connected with a fourth charging diode, the fourth discharging relay is connected with a fourth discharging diode, the fourth battery is respectively connected with the fourth charging diode and the fourth discharging diode, and the fourth shunt is connected with a fourth battery pack working switch.
By adopting the technical scheme, the cost is reduced while the normal use of the circuit is effectively ensured through the connection relation.
The invention is further configured to: the energy storage power station direct current loop topology system also comprises a current detection device for detecting the condition of input current of the charger in real time, a temperature detection device arranged in the charger and used for detecting the working temperature in the charger, a voltage detection device arranged in the charger and used for detecting the condition of voltage in the charger, and a temperature-voltage ratio generation module generated based on the ratio of the temperature detected by the temperature detection device in real time to the voltage detected by the voltage detection device in real time;
if the voltage detected by the voltage detection device reaches the threshold voltage preset by the controller and the ratio of the temperature-voltage ratio generation module reaches the threshold value preset by the controller, the controller closes the connection between the charger and the external power supply.
By adopting the technical scheme, whether the electric quantity stored in the energy storage power station reaches the overshoot standard or not can be effectively analyzed through the arrangement of the voltage detection device, the temperature detection device and the temperature-voltage ratio generation module.
The invention is further configured to: the energy storage power station direct current loop topology system also comprises an energy storage power station discharge time database for a user to set the discharge time and the discharge duration of the energy storage power station, and an electric quantity detection device for detecting the electric quantity condition of the energy storage power station in real time;
the controller calls the discharge time and the discharge time of the energy storage power station in the energy storage power station discharge time database, the sum of the product of the discharge time of the energy storage power station and the discharge amount of the controller in the preset maximum unit time and the minimum charged amount required to be kept by the energy storage power station in the preset control mode serves as the reserved electric quantity required by the charger, and the controller charges the electric quantity of the charger to the reserved electric quantity required by the charger through the charger before the energy storage power station discharges.
By adopting the technical scheme, the discharge time of the energy storage power station can be effectively obtained through the arrangement of the controller, the energy storage power station discharge time database and the electric quantity detection device, and timely charging is carried out by combining the discharge time of the energy storage power station so as to be used by subsequent electric quantity.
The invention is further configured to: the energy storage power station direct current loop topology system also comprises a charging price period database for storing periods and unit charging prices corresponding to the periods;
the controller calls the charging unit prices of the corresponding periods in the charging price period database, and the charging period corresponding to the higher charging unit price is used as a query object to query the discharging time database of the energy storage power station for the time and the duration of the charging unit price which is higher and needs to be discharged at the same time:
the controller takes the sum of the product of the time corresponding to the time with higher charging unit price and needing to be discharged and the maximum discharge amount in unit time preset by the controller and the minimum charge amount required to be kept by the energy storage power station as the reserve electric quantity required by the charger, and the controller controls the charger to charge the charge amount of the charger to the reserve electric quantity required by the charger in the period with lower charging price;
and if the reserved electric quantity required by the charger exceeds the preset threshold electric quantity of the controller, the controller charges the charged electric quantity of the charger to the preset threshold electric quantity of the controller in the period of low charging price.
Through adopting above-mentioned technical scheme, can be according to the reasonable arrangement charge time of the factor of the price of charging and the required time of electric quantity through the setting of controller, the price period database that charges, reduce the waste of money under the circumstances of guaranteeing the electric quantity.
The invention is further configured to: the energy storage power station direct current loop topology system further comprises a first database storing the charging amount of the charger in unit time at each time, and a prediction module used for predicting the charging amount of the charger in unit time at the next time, wherein the prediction algorithm formula of the prediction module is as follows: z = a-b, where Z is a next unit time charge amount, a is a last unit time charge amount, and b is a difference between historically adjacent two unit time charge amounts;
the controller calls a first database to obtain the charging amount of the charger per unit time, so that the charging amounts of two adjacent units of time are obtained and averaged, and the charging amount of the next unit time is obtained through a budget module;
the controller takes the charger as a decrement, takes the current electric quantity of the charger as a decrement, takes the difference value of the two as the electric quantity required to be charged and as a dividend, takes the charge quantity of the next unit time as a divisor, takes the quotient of the two as the time consumed by actual charging, and takes the time consumed by actual charging corresponding to the period with higher charging price as the starting time of charging of the charger in advance.
By adopting the technical scheme, the effective prediction of the charging opportunity of the charger is effectively realized through the arrangement of the first database and the prediction module, so that on one hand, the money waste is reduced, and on the other hand, the charger is ensured to have enough electric quantity when needed.
The invention is further configured to: the energy storage power station direct current loop topology system also comprises a charger optimal charging information database which stores the temperature, the optimal charging voltage and the optimal charging current of the charger at the corresponding temperature;
the controller queries the optimal charging voltage and the optimal charging current of the charger in the optimal charging information database of the charger by taking the temperature detected by the temperature detection device as a query object, and controls the charger to continuously charge at the optimal charging voltage and the optimal charging current.
By adopting the technical scheme, the optimal charging information database of the controller and the charger is arranged, so that the highest efficiency of the charger can be kept during charging.
In conclusion, the beneficial technical effects of the invention are as follows: whether the energy storage power station reaches the overshoot critical point can be judged through the arrangement of the current detection device, the voltage detection device and the controller, and the energy storage power station is cut off in time when the energy storage power station reaches the overshoot critical point.
Drawings
Fig. 1 is a system block diagram i of a dc loop topology system of an energy storage power station according to the present invention.
Fig. 2 is a system block diagram ii of the energy storage power station dc loop topology system of the present invention.
In the figure, 1, a current detection device; 2. a temperature detection device; 3. a voltage detection device; 4. a temperature voltage ratio generation module; 5. an energy storage power station discharge time database; 6. an electric quantity detection device; 7. a charge price period database; 8. a charger optimal charging information database; 9. a first database; 10. a prediction module; e100, a controller; f101, a charger; f102, an inverter; a100, a first battery management system; b100, a second battery management system; c100, a third battery management system; d100, a fourth battery management system; a107, a first battery pack operating switch; b107, a second battery pack working switch; c107, a third battery pack working switch; d107, a fourth battery pack working switch; a102, a first charging relay; b102, a second charging relay; c102, a third charging relay; d102, a fourth charging relay; a101, a first discharging relay; b101, a second discharge relay; c101, a third discharge relay; d101, a fourth discharge relay; a105, a first charging diode; b105, a second charging diode; controller C105, a third charging diode; d105, a fourth charging diode; a104, a first discharge diode; controller B104, a second discharge diode; c104, a third discharge diode; d014, fourth discharge diode; a106, a first battery; b106, a second battery; c106, a third battery; d106, a fourth battery; a103, a first shunt; b103, a second shunt; c103, a third shunt; d103, a fourth shunt.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the energy storage power station dc loop topology system disclosed by the present invention includes a controller E100, a charger F101, an inverter F100, a battery management system group, a battery pack operating switch, a charging relay group, a discharging relay group, a charging diode group, a discharging diode group, a battery pack and a shunt group, where the controller E100 is connected to the battery management system group, the charger F101 is connected to the charging relay group, the inverter F100 is connected to the discharging relay group, the charging relay group is connected to the charging diode group, the discharging relay group is connected to the discharging diode group, the battery pack is connected to the charging relay group and the discharging relay group, respectively, the battery management system group is connected to the shunt group, and the controller E100 is preferably a central processing unit.
The battery management system group comprises a first battery management system A100, a second battery management system B100, a third battery management system C100 and a fourth battery management system D100, the battery pack working switches comprise a first battery pack working switch A107, a second battery pack working switch B107, a third battery pack working switch C107 and a fourth battery pack working switch D107, the charging relay group comprises a first charging relay A102, a second charging relay B102, a third charging relay C102 and a fourth charging relay D102, the discharging relay group comprises a first discharging relay A101, a second discharging relay B101, a third discharging relay C101 and a fourth discharging relay D101, the charging diode group comprises a first charging diode A105, a second charging diode B105, a third charging diode C105 and a fourth charging diode D105, and the discharging diode group comprises a first discharging diode A104, a second discharging diode B104, The battery pack comprises a first battery A106, a second battery B106, a third battery C106 and a fourth battery D106, the shunt group comprises a first shunt A103, a second shunt B103, a third shunt C103 and a fourth shunt D103, and the battery pack working switch is connected with the charger F101.
The first battery management system A100 is respectively connected with a first charging relay A102 and a first discharging relay A101, the first charging relay A102 is connected with a first charging diode A105, the first discharging relay A101 is connected with a first discharging diode A104, a first battery A106 is respectively connected with the first charging diode A105 and the first discharging diode A104, and a first current divider A103 is connected with a first battery pack working switch A107;
the second battery management system B100 is respectively connected to a second charging relay B102 and a second discharging relay B101, the second charging relay B102 is connected to a second charging diode B105, the second discharging relay B101 is connected to a second discharging diode B104, the second battery B106 is respectively connected to the second charging diode B105 and the second discharging diode B104, and the second shunt B103 is connected to a second battery pack operating switch B107;
the third battery management system C100 is connected to a third charging relay C102 and a third discharging relay C101, respectively, the third charging relay C102 is connected to a third charging diode C105, the third discharging relay C101 is connected to a third discharging diode C104, the third battery C106 is connected to the third charging diode C105 and the third discharging diode C104, respectively, and the third shunt C103 is connected to a third battery pack operating switch C107;
the fourth battery management system D100 is connected to a fourth charging relay D102 and a fourth discharging relay D101, respectively, the fourth charging relay D102 is connected to a fourth charging diode D105, the fourth discharging relay D101 is connected to a fourth discharging diode D104, the fourth battery D106 is connected to the fourth charging diode D105 and the fourth discharging diode D104, respectively, and the fourth shunt D103 is connected to a fourth battery pack operating switch D107.
As shown in fig. 2, further considering that to prevent the energy storage power station from overshoot, the energy storage power station dc loop topology system further includes a current detection device 1 for detecting the input current condition of the charger F101 in real time, a temperature detection device 2 disposed inside the charger F101 for detecting the internal operating temperature of the charger F101, a voltage detection device 3 disposed inside the charger F101 for detecting the internal voltage condition of the charger F101, and a temperature-voltage ratio generation module 4 generated based on the ratio between the temperature detected by the temperature detection device 2 in real time and the voltage detected by the voltage detection device 3 in real time, wherein the current detection device 1 is preferably a current sensor, and the temperature detection device 2 is preferably a temperature sensor.
The phenomenon of preventing the energy storage power station from overshooting is realized by combining the technical characteristics as follows: when the voltage detected by the voltage detection device 3 reaches the threshold voltage preset by the controller E100 and the ratio of the temperature-voltage ratio generation module 4 reaches the threshold value preset by the controller E100, the controller E100 closes the connection between the charger F101 and the external power supply.
Further considering that the electric quantity of the actual energy storage power station can meet the discharge requirement when the energy storage power station needs to discharge, the direct-current loop topological system of the energy storage power station further comprises an energy storage power station discharge time database 5 for storing the discharge time and the discharge duration of the energy storage power station set by a user and electric quantity detection for detecting the electric quantity condition of the energy storage power station in real time.
The process of keeping the electric quantity of the energy storage power station to meet the discharge requirement by combining the technical characteristics is as follows: the controller E100 calls the discharge time and the discharge time of the energy storage power station in the energy storage power station discharge time database 5, the controller E100 takes the product of the discharge time of the energy storage power station and the discharge amount of the controller E100 in the preset maximum unit time and the sum of the minimum charge amount required to be kept by the energy storage power station in the preset control as the reserve electric quantity required by the charger F101, and the controller E100 charges the electric quantity of the charger F101 to the reserve electric quantity required by the charger F101 through the charger F101 before the energy storage power station discharges.
In further consideration of the fact that the energy storage power station can store the electric quantity in the time period with the deviated electricity price so as to discharge when needed, the direct current loop topology system of the energy storage power station further comprises a charging price period database 7 which stores periods and charging prices corresponding to the periods per unit.
The controller E100 retrieves the charging unit prices of the corresponding periods in the charging price period database 7, and queries the discharging time database 5 of the energy storage power station about the charging period corresponding to the higher charging unit price as a query object, so as to find out the time in which the charging unit prices are higher and the discharging is needed at the same time.
The controller E100 takes the product of the time length corresponding to the time when the charging unit price is higher and the discharging is needed at the same time and the maximum discharging amount per unit time preset by the controller E100 and the sum of the minimum charged amounts required to be kept by the preset energy storage power station as the reserved electric quantity required by the charger F101, and the controller E100 controls the charger F101 to charge the charged amount of the charger F101 to the reserved electric quantity required by the charger F101 in the period when the charging price is lower.
If the reserved electric quantity required by the charger F101 exceeds the preset threshold electric quantity of the controller E100, the controller E100 charges the charged electric quantity of the charger F101 to the preset threshold electric quantity of the controller E100 in a period when the charging price is low.
Further considering that a proper charging practice is selected in the practical application process, the energy storage power station dc loop topology system further includes a first database 9 storing the charging amount per unit time of the charger F101, and a prediction module 10 for predicting the charging amount per unit time of the charger F101, where a prediction algorithm formula of the prediction module 10 is as follows: z = a-b, where Z is a next unit time charge amount, a is a last unit time charge amount, and b is a difference between historically adjacent two unit time charge amounts;
the controller E100 calls the first database 9 to obtain the charging amount per unit time of the charger F101, so as to obtain the charging amounts per unit time of two adjacent times, and obtains the charging amount per unit time of the next time through the budgeting module 10;
the controller E100 uses the charger F101 as a decrement, the current electric quantity of the charger F101 as a decrement, the difference between the two as the electric quantity to be charged and as a dividend, the charge quantity per unit time next as a divisor, the quotient of the two as the actual time spent for charging, and the actual time spent for charging corresponding to a period earlier than the charge price as the start timing of charging the charger F101
Further considering that the optimal charging conditions of the charger F101 are different at different temperatures of the energy storage power station, in order to achieve faster and better electric quantity storage of the energy storage power station, the energy storage power station dc loop topology system further includes a charger F101 optimal charging information database 8 storing the optimal charging voltage and charging current of the charger F101 at the temperature and the corresponding temperature.
The electric quantity storage process of the energy storage power station which is faster and better is realized by combining the technical characteristics is as follows: the controller E100 searches the optimal charging voltage and charging current of the charger F101 in the optimal charging information database 8 of the charger F101 for the temperature detected by the temperature detection device 2, and controls the charger F101 to perform continuous charging at the optimal charging voltage and the optimal charging current.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The utility model provides an energy storage power station direct current loop topology system, its characterized in that, includes controller (E100), charger (F101), inverter (F102), battery management system group, group battery operating switch, charging relay group, discharge relay group, charging diode group, discharge diode group, group battery and reposition of redundant personnel group, controller (E100) be connected with battery management system group, charger (F101) be connected with charging relay group, inverter (F102) be connected with discharge relay group, charging relay group be connected with charging diode group, discharge relay group be connected with discharge diode group, the group battery be connected with charging relay group and discharge relay group respectively, battery management system group be connected with reposition of redundant personnel group.
2. An energy storage plant DC loop topology system according to claim 1, characterized in that the battery management system set comprises a first battery management system (A100), a second battery management system (B100), a third battery management system (C100) and a fourth battery management system (D100), the battery pack operation switches comprise a first battery pack operation switch (A107), a second battery pack operation switch (B107), a third battery pack operation switch (C107) and a fourth battery pack operation switch (D107), the charging relay set comprises a first charging relay (A102), a second charging relay (B102), a third charging relay (C102) and a fourth charging relay (D102), the discharging relay set comprises a first discharging relay (A101), a second discharging relay (B101), a third discharging relay (C101) and a fourth discharging relay (D101), the charging diode group comprises a first charging diode (A105), a second charging diode (B105), a third charging diode (C105) and a fourth charging diode (D105), the discharging diode group comprises a first discharging diode (A104), a second discharging diode (B104), a third discharging diode (C104) and a fourth discharging diode (D014), the battery group comprises a first battery (A106), a second battery (B106), a third battery (C106) and a fourth battery (D106), the current divider group comprises a first current divider (A103), a second current divider (B103), a third current divider (C103) and a fourth current divider (D103), and the battery group working switch is connected with a charger (F101);
the first battery management system (A100) is respectively connected with a first charging relay (A102) and a first discharging relay (A101), the first charging relay (A102) is connected with a first charging diode (A105), the first discharging relay (A101) is connected with a first discharging diode (A104), the first battery (A106) is respectively connected with the first charging diode (A105) and the first discharging diode (A104), and the first current divider (A103) is connected with a first battery pack working switch (A107);
the second battery management system (B100) is respectively connected with a second charging relay (B102) and a second discharging relay (B101), the second charging relay (B102) is connected with a second charging diode (B105), the second discharging relay (B101) is connected with a second discharging diode (B104), the second battery (B106) is respectively connected with the second charging diode (B105) and the second discharging diode (B104), and the second shunt (B103) is connected with a second battery (B106) group work switch (B107);
the third battery management system (C100) is respectively connected with a third charging relay (C102) and a third discharging relay (C101), the third charging relay (C102) is connected with a third charging diode (C105), the third discharging relay (C101) is connected with a third discharging diode (C104), the third battery (C106) is respectively connected with a third charging diode (C105) and a third discharging diode (C104), and the third shunt (C103) is connected with a third battery (C106) group operating switch (C107);
fourth battery (D106) management system (D100) be connected with fourth charging relay (D102) and fourth discharging relay (D101) respectively, fourth charging relay (D102) be connected with fourth charging diode (D105), fourth discharging relay (D101) be connected with fourth discharging diode (D014), fourth battery (D106) be connected with fourth charging diode (D105) and fourth discharging diode (D014) respectively, fourth shunt be connected with fourth battery (D106) group work switch (D107).
3. The energy storage power station direct current loop topology system according to claim 2, characterized in that the energy storage power station direct current loop topology system further comprises a current detection device (1) for detecting the condition of the input current of the charger (F101) in real time, a temperature detection device (2) arranged inside the charger (F101) for detecting the internal working temperature of the charger (F101), a voltage detection device (3) arranged inside the charger (F101) for detecting the internal voltage condition of the charger (F101), and a temperature-voltage ratio generation module (4) generated based on the ratio between the temperature detected by the temperature detection device (2) in real time and the voltage detected by the voltage detection device (3) in real time;
if the voltage detected by the voltage detection device (3) reaches the threshold voltage preset by the controller (E100) and the ratio of the temperature-voltage ratio generation module (4) reaches the threshold value preset by the controller (E100), the controller (E100) closes the connection between the charger (F101) and the external power supply.
4. The energy storage power station direct current loop topology system according to claim 3, characterized in that the energy storage power station direct current loop topology system further comprises an energy storage power station discharge time database (5) for storing the discharge time and the discharge duration of the energy storage power station set by a user, and an electric quantity detection device (6) for detecting the electric quantity condition of the energy storage power station in real time;
the controller (E100) calls the discharge time and the discharge time of the energy storage power station in the energy storage power station discharge time database (5), the controller (E100) takes the product of the discharge time of the energy storage power station and the discharge amount of the controller (E100) in the preset maximum unit time and the sum of the minimum charge amount required to be kept by the control preset energy storage power station as the required reserve electric quantity of the charger (F101), and the controller (E100) charges the electric quantity of the charger (F101) to the required reserve electric quantity of the charger (F101) through the charger (F101) before the energy storage power station discharges.
5. An energy storage plant dc link topology system according to claim 4, characterized in that the energy storage plant dc link topology system further comprises a charging price period database (7) storing periods and charging prices per period;
the controller (E100) calls the charging unit prices of the corresponding periods in the charging price period database (7), and queries the discharging time database (5) of the energy storage power station for the time and the time length which have the charging unit prices higher and need to be discharged at the same time by taking the charging period corresponding to the charging unit prices higher as a query object:
the controller (E100) takes the sum of the product of the time length corresponding to the time with higher charging unit price and the time needing discharging and the maximum discharging amount per unit time preset by the controller (E100) and the minimum charged amount required to be kept by the energy storage power station as the reserved electric quantity required by the charger (F101), and the controller (E100) controls the charger (F101) to flush the charged amount of the charger (F101) to the reserved electric quantity required by the charger (F101) in the period with lower charging price;
if the reserved electric quantity required by the charger (F101) exceeds the preset threshold electric quantity of the controller (E100), the controller (E100) charges the charged electric quantity of the charger (F101) to the preset threshold electric quantity of the controller (E100) in a period when the charging price is low.
6. The energy storage power station direct current loop topology system according to claim 5, characterized in that the energy storage power station direct current loop topology system further comprises a first database (9) storing the charge amount per unit time of the charger (F101), and a prediction module (10) for predicting the charge amount per unit time of the charger (F101) next time, wherein the prediction algorithm formula of the prediction module (10) is as follows: z = a-b, where Z is a next unit time charge amount, a is a last unit time charge amount, and b is a difference between historically adjacent two unit time charge amounts;
the controller (E100) calls the first database (9) to obtain the charge quantity of the charger (F101) per unit time, so as to obtain the charge quantities of two adjacent times per unit time, and obtains the charge quantity of the next unit time through the budget module (10) by taking an average value;
the controller (E100) takes the charger (F101) as a decrement, takes the current electric quantity of the charger (F101) as a decrement, takes the difference value of the two as the electric quantity required to be charged and a dividend, takes the charge quantity of the next unit time as a divisor, takes the quotient of the two as the actual charging required elapsed time, and takes the actual charging required elapsed time corresponding to the time period with higher charging price as the starting time of charging of the charger (F101).
7. An energy storage power station dc loop topology system according to claim 6, characterized by further comprising a charger (F101) optimal charging information database (8) storing the optimal charging voltage and charging current of the charger (F101) at the temperature and the corresponding temperature;
the controller (E100) searches the optimal charging voltage and charging current of the charger (F101) in the optimal charging information database (8) of the charger (F101) by using the temperature detected by the temperature detection device (2) as a query object, and controls the charger (F101) to continuously charge at the optimal charging voltage and the optimal charging current.
8. An energy storage plant dc loop topology according to claim 7, characterized in that the current detection means (1) is a current sensor.
9. An energy storage plant dc loop topology according to claim 7, characterized in that the voltage detection means (3) is a voltage sensor.
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