CN115566714A - Standby power module, alternating current energy storage system and power supply method - Google Patents
Standby power module, alternating current energy storage system and power supply method Download PDFInfo
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- CN115566714A CN115566714A CN202211395844.1A CN202211395844A CN115566714A CN 115566714 A CN115566714 A CN 115566714A CN 202211395844 A CN202211395844 A CN 202211395844A CN 115566714 A CN115566714 A CN 115566714A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a standby power module, an alternating current energy storage system and a power supply method, wherein the standby power module comprises a rectification filter circuit, a one-way inverter circuit and three control switches which are sequentially and electrically connected; the input end of the rectifying filter circuit is connected with the three external phase lines, and the output end of the unidirectional inverter circuit is respectively connected to the three external phase lines through three control switches. According to the technical scheme, the standby power module is additionally arranged in the alternating-current energy storage system, so that the technical effects of power compensation, phase compensation, electric quantity balance and the like are achieved. The technical scheme improves the reliability of three-phase alternating current output of the energy storage system, realizes the balance of electric quantity among different alternating current battery modules, and has important significance for the energy storage system adopting the alternating current battery modules during three-phase alternating current power supply.
Description
Technical Field
The invention relates to the technical field of energy storage and power application powered by batteries, in particular to a standby power module, an alternating current energy storage system and a power supply method.
Background
In electrical power applications, since most of high-power electric devices are powered by three-phase alternating current, an energy storage system using a battery pack often needs to invert direct current of the battery pack into three-phase alternating current for output. With the development of energy storage systems, advanced technologies in the industry have been developed to integrate a high-efficiency charging function and an inversion function into a battery management system, so that a battery module directly has functions of ac input and ac output, and becomes an ac battery module. Because in the scheme, the charger and the inverter are directly integrated in the alternating current battery module in a dispersed mode, the electric energy conversion efficiency can be higher, and meanwhile, the heat can be dispersed and the module standardization is formed; when the electricity storage quantity needs to be enlarged or the output power needs to be increased, the system can be realized by only adding the battery module, and has good expandability; and because the volume occupation of the charger and the inverter is reduced, the power density of the energy storage system can be higher, and the whole system has the advantages of high efficiency, high power density, heat dispersion, modularization, easiness in expansion of electric quantity and power and low cost. Therefore, the alternating current battery module integrating the high-efficiency charging function and the inversion function into the battery management system becomes the future industry development direction.
However, when the existing energy storage system adopting the ac battery modules to compose the three-phase ac output in the industry is in an unbalanced state, when the three-phase load is in an unbalanced state, the load power of the battery pack connected to each phase line is different, which may cause the difference of the charge state of the battery pack on each phase line to be larger and larger, and may cause the short-plate effect to occur.
Disclosure of Invention
Therefore, it is necessary to provide a power backup module, an ac energy storage system, and a power supply method for different battery packs of the existing ac energy storage system, which are prone to short-plate effect of electric quantity.
On one hand, the invention provides a standby power module which is applied to an energy storage system of alternating current output and comprises a rectifying filter circuit, a unidirectional inverter circuit and three control switches which are electrically connected in sequence; the input end of the rectification filter circuit is connected with the three external phase lines, and the output end of the one-way inverter circuit is respectively connected to the three external phase lines through three control switches.
On the other hand, the invention provides an alternating current energy storage system, which comprises a control unit, at least three single-phase cross flow battery modules and a standby power module; three phase lines and zero lines of the standby power module and all the single-phase alternating current battery modules are respectively connected in parallel and are connected with a three-phase alternating current load;
the single-phase alternating current battery module comprises a battery pack, a DA conversion module and a gating switch for selecting one of three phase lines for gating;
the control unit comprises a phase control interface, and the phase control interface respectively controls a control switch of the standby power module and a gating switch of the single-phase alternating-current battery module; when discharging, the control unit controls the three single-phase alternating current battery modules to be respectively conducted to one phase line of the load, and can control the preparation electric module to be alternatively conducted to one phase line.
Further, the single-phase alternating current battery module further comprises a battery management circuit for managing charging and discharging of the battery pack.
Further, the DA conversion module further includes an AD conversion unit that converts alternating current into direct current when charging, so as to charge the battery pack.
Furthermore, the control unit also comprises a communication interface which is in communication connection with the communication interface of the standby power module and the battery management circuit of each single-phase alternating-current battery module.
Further, the battery pack comprises a plurality of single batteries which are connected in series and can be increased and decreased.
In one aspect, the present invention provides a power supply method for an ac energy storage system, which is applied to the ac energy storage system, and includes the steps of:
s11: setting the outputs of all the single-phase alternating-current battery modules to have the same amplitude and frequency and a phase difference of 120 degrees with each other through the communication interface;
s12: controlling the alternating current output of each single-phase alternating current battery module to be respectively connected to three different phase lines through a phase control interface;
s13: and controlling the standby power module, setting the standby power module to have the same amplitude, frequency and phase as the phase line of the high liability, and connecting the standby power module with the phase line of the high liability for power compensation.
S23: when the output of a single-phase current battery module is abnormal to cause phase failure, the standby power module is set to have the same amplitude, frequency and phase as the phase line of the phase failure, and is connected with the phase line of the phase failure to perform phase compensation.
S33: and monitoring the residual electric quantity of each single-phase alternating current battery module, and when the residual electric quantity difference between the two single-phase alternating current battery modules is greater than a preset value, exchanging the phase lines connected with the two single-phase alternating current battery modules through the standby power module.
Further, step S33 includes:
s331, controlling a standby power module to be connected to a first phase line for supplying power;
s332, controlling the first single-phase cross flow battery module to be disconnected with the first phase line;
s332, adjusting the output amplitude, frequency and phase of the first single-phase cross flow battery module to be the same as those of the second single-phase cross flow battery module, and connecting the first single-phase cross flow battery module with the second phase line for power supply;
s333: controlling the second single-phase cross flow battery module to be disconnected from the second phase line;
s334: adjusting the output amplitude, frequency and phase of the second single-phase cross flow battery module to be the same as those of the standby power module, and connecting the second single-phase cross flow battery module to the first phase line for power supply;
s335: and controlling the standby power module to be disconnected from the first phase line.
According to the technical scheme, the standby power module is additionally arranged in the alternating-current energy storage system, so that the technical effects of power compensation, phase compensation, electric quantity balance and the like are achieved. The technical scheme improves the reliability of three-phase alternating current output of the energy storage system, realizes the balance of electric quantity among different alternating current battery modules, and has important significance for the energy storage system adopting the alternating current battery modules during three-phase alternating current power supply.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of a power backup module according to the present invention;
FIG. 2 is a block diagram of an embodiment of an AC energy storage system of the present invention;
FIG. 3 is a schematic circuit diagram of an embodiment of a single-phase current cell module according to the present invention;
FIG. 4 is a schematic diagram of the steps of the power supply method of the AC energy storage system for power compensation according to the present invention;
FIG. 5 is a schematic diagram of a phase compensation process performed by the power supply method of the AC energy storage system according to the present invention;
fig. 6 is a schematic diagram illustrating steps of an embodiment of a power supply method of an ac energy storage system for equalizing electric quantity according to the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is apparent that the specific details set forth in the following description are merely exemplary of the invention, which can be practiced in many other embodiments that depart from the specific details disclosed herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In an embodiment, referring to fig. 1, fig. 2 and fig. 3, the present invention provides an ac energy storage system, including a control unit, three single-phase current battery modules and a standby module; three phase lines and zero lines of the standby power module and all the single-phase alternating current battery modules are respectively connected in parallel and are connected with a three-phase alternating current load;
the power supply module is applied to an energy storage system of alternating current output and comprises a rectification filter circuit, a one-way inverter circuit and three control switches which are sequentially and electrically connected; the input end of the rectifying filter circuit is connected with the three external phase lines, and the output end of the unidirectional inverter circuit is respectively connected to the three external phase lines through three control switches.
The single-phase alternating current battery module comprises a battery pack, a DA conversion module, a gating switch and a battery management circuit (battery management system, BMS), wherein the gating switch is used for gating one of three phase lines, and the battery management circuit is used for managing charging and discharging of the battery pack. The battery pack comprises a plurality of serially connected and adjustable single batteries. The DA conversion module also comprises an AD conversion unit which is actually a bidirectional conversion module for converting AC into DC and converting DC into AC; during charging, the AD conversion unit converts alternating current into direct current during charging so as to charge the battery pack; when discharging, the inverter module is used for converting direct current into alternating current for an external load.
The control unit comprises a phase control interface and a communication interface, wherein the phase control interface respectively controls a control switch of the standby power module and a gating switch of the single-phase alternating-current battery module; during discharging, the control unit controls the three single-phase alternating-current battery modules to be respectively conducted to one phase line of the load, and controls the preparation electric modules to be alternatively conducted to one phase line. The communication interface is in communication connection with the communication interface of the standby power module and the battery management circuit of each single-phase alternating current battery module.
The system consists of a control unit standby power module and three or more single-phase alternating current battery modules. The core of the system is a standby power module, the standby power module takes three-phase power output by the energy storage system as input, carries out power conversion to generate single-phase output, and realizes output power compensation of a certain phase line through control of a control unit; and can replace a single-phase alternating current battery module to be connected to a certain phase line for power supply. The interior of the standby power module consists of a three-phase rectification filter circuit, a single-phase inverter circuit and a control switch of an output phase line, and is provided with a communication interface and a phase control signal input interface, and the standby power module can receive a command of a control unit and output single-phase alternating current according to certain amplitude, frequency and phase requirements; the single-phase alternating current battery module internally comprises a plurality of single batteries connected in series, a battery management system with a communication interface end and a control signal end and a gating switch of a phase line, wherein an AC/DC and DC/AC bidirectional conversion function is integrated in the battery management system inside the single-phase alternating current battery module, namely, a charging function and an inversion function are integrated in the battery management system, or only a DC/AC inversion function is integrated in the battery management system.
The connection relationship among all the parts is shown in the attached drawing, three phase lines and zero lines of the output end of all the single-phase alternating current battery modules are respectively connected in parallel, and are respectively connected in parallel with three phase lines and zero lines of the output end of the standby power module and are connected to an external three-phase alternating current load. And the communication interface of the control unit is connected with the communication interfaces of all the single-phase alternating current battery modules and the standby power module, so that the control unit can communicate with all the single-phase alternating current battery modules and the standby power module. The control unit outputs phase control signals to all the single-phase cross flow battery modules and the standby power module, so that the alternating current output phases of all the modules can be controlled to be in alternating current output states with the phase differences of 0 degree, 120 degrees and 240 degrees, phase line selection switches in all the modules are composed of 3 switches K1-K3, a single-phase alternating current sine wave for controlling output is connected to one of three phase lines, for example, three battery packs are respectively connected with the three phase lines, and the three phase lines are mutually output with the phase differences of 120 degrees, so that three-phase output alternating current is formed.
According to the technical scheme, the standby power module is additionally arranged in the alternating-current energy storage system, so that the technical effects of power compensation, phase compensation, electric quantity balance and the like are achieved. The technical scheme improves the reliability of three-phase alternating current output of the energy storage system, realizes the balance of electric quantity among different alternating current battery modules, and has important significance for the energy storage system adopting the alternating current battery modules during three-phase alternating current power supply.
Referring to fig. 4, when the above system is applied, in order to perform power compensation, a power supply method of an alternating current energy storage system is provided, and the method comprises the following steps:
s11: setting the outputs of all the single-phase alternating-current battery modules to have the same amplitude and frequency and a phase difference of 120 degrees with each other through the communication interface;
s12: controlling the alternating current output of each single-phase alternating current battery module to be respectively connected to three different phase lines through a phase control interface;
s13: and controlling the standby power module, setting the standby power module to have the same amplitude, frequency and phase as the phase line of the high liability, and connecting the standby power module with the phase line of the high liability for power compensation.
In this embodiment, the control unit communicates with each single-phase ac battery module through the communication interface, sequentially sets each single-phase ac battery module to the same amplitude and frequency for output, and makes the outputs of the single-phase ac battery modules have a phase difference of 120 degrees with each other, and outputs a phase control signal to all the single-phase ac battery modules, so that the ac outputs of all the single-phase ac battery modules operate according to the set phase, and at the same time, the ac outputs of each single-phase ac battery module are respectively connected to different phase lines according to the control requirements of the control unit, for example, the 1 st module is connected to the L1 phase line, the 2 nd module is connected to the L2 phase line, the 3 rd module is connected to the L3 phase line, and the zero lines are all connected together. When external three-phase loads are unbalanced, for example, the load of an L1 phase line is 5000W, and the load of an L2 phase line and an L3 phase line is 3000W, at this time, the control unit communicates with the standby power module through the communication interface, the standby power module is set to have the same amplitude, frequency and phase as those of the L1 phase line and is connected to the L1 phase line for output, at this time, the power supply power of the L1 phase line is equal to the sum of the output powers of the 1 st single-phase alternating-current battery module and the standby power module, which is equal to the power of the L1 phase line compensated by the standby power module, so that the phase power has higher output capability.
Referring to fig. 5, in order to perform phase-loss compensation when a system is in phase-loss state, the invention provides a power supply method of an alternating current energy storage system, which is applied to the alternating current energy storage system and includes the steps of:
s21: setting the outputs of all the single-phase alternating-current battery modules to have the same amplitude and frequency and a phase difference of 120 degrees with each other through the communication interface;
s22: controlling the alternating current output of each single-phase alternating current battery module to be respectively connected to three different phase lines through a phase control interface;
s23: when the output of a single-phase current battery module is abnormal to cause phase failure, the standby power module is set to have the same amplitude, frequency and phase as the phase line of the phase failure, and is connected with the phase line of the phase failure to perform phase compensation.
In an embodiment, when an energy storage system with three-phase inversion output is formed by three single-phase alternating current battery modules, if one single-phase alternating current battery module fails for some reason and cannot supply power, for example, the single-phase alternating current battery module with the L1 phase line fails, at this time, the control unit may communicate with the standby power module through the communication interface, set the standby power module to have the same amplitude, frequency and phase as those of the L1 phase line, and connect the standby power module to the L1 phase line for output, thereby ensuring the three-phase power supply function of the system.
Referring to fig. 6, in order to maintain the state of charge balance of each single-phase ac battery module, the present invention provides a power supply method for an ac energy storage system, including the steps of:
s31: setting the outputs of all the single-phase alternating-current battery modules to have the same amplitude and frequency and a phase difference of 120 degrees with each other through the communication interface;
s32: controlling the alternating current output of each single-phase alternating current battery module to be respectively connected to different phase lines through a phase control interface;
s33: and monitoring the residual electric quantity of each single-phase alternating current battery module, and when the residual electric quantity difference between the two single-phase alternating current battery modules is greater than a preset value, exchanging the phase lines connected with the two single-phase alternating current battery modules through the standby power module. Specifically, S33 includes:
s331, controlling a standby power module to be connected to a first phase line therein for supplying power;
s332, controlling the first single-phase cross flow battery module to be disconnected with the first phase line;
s332, adjusting the output amplitude, frequency and phase of the first single-phase cross flow battery module to be the same as those of the second single-phase cross flow battery module, and connecting the first single-phase cross flow battery module with the second phase line for power supply;
s333: controlling the second single-phase cross flow battery module to be disconnected from the second phase line;
s334: adjusting the output amplitude, frequency and phase of the second single-phase cross flow battery module to be the same as those of the standby power module, and connecting the second single-phase cross flow battery module to the first phase line for power supply;
s335: and controlling the standby power module to be disconnected from the first phase line.
In a specific embodiment, the control unit communicates with all the single-phase alternating-current battery modules through the communication interface in real time to exchange load power information of each phase line, and simultaneously obtains a residual electric quantity value of each single-phase alternating-current battery module, and when the difference between the residual electric quantity values of the single-phase alternating-current battery modules is larger than a specified value (for example, 0.2%), the phase lines of the single-phase alternating-current battery modules are switched through the standby power module, so that the single-phase alternating-current battery modules with low electric charge are switched to the phase line with the lightest load, and therefore charge balance among the single-phase alternating-current battery modules is achieved. For example, three single-phase ac battery modules A, B, C are respectively connected to three phase lines of L1, L2 and L3, and their initial states of charge are all 100%, and when a three-phase load is supplied, the load power of L1 phase is 5000w, the load power of L2 phase is 4500w, and the load power of L3 phase is 4300W, and after a period of use, because the load power of L1 phase is large, the state of charge of the single-phase ac battery module a connected to L1 phase is lower than that of the other two, and the load power of L3 phase is minimum, and the state of charge of the single-phase ac battery module C connected to L3 phase is higher than that of the other two. At this time, the control unit can switch the power supply phase line position of the single-phase alternating current battery module to achieve balance through the following control modes:
the control unit enables the standby power module to be connected to the L1 phase line for supplying power in a communication command mode; the control unit disconnects the single-phase alternating-current battery module A from the L1 phase line in a communication command mode; the control unit adjusts the output amplitude, frequency and phase of the single-phase alternating current battery module A to be the same as those of the L3 phase line in a communication command mode, and the single-phase alternating current battery module A is connected to the L3 phase line for power supply; the control unit disconnects the single-phase alternating-current battery module C from the L3 phase line in a communication command mode; the control unit adjusts the output amplitude, frequency and phase of the single-phase alternating current battery module C to be the same as those of the L1 phase line in a communication command mode, and the single-phase alternating current battery module C is connected to the L1 phase line for power supply; and the control unit disconnects the standby power module from the L1 phase line in a communication command mode.
After the operation, the single-phase alternating current battery module A with low charge state is connected with the phase line with light load power, the single-phase alternating current battery module C with high charge state is connected with the phase line with heavy load power, the whole power supply process is continuously processed in real time, so that the charge state difference between the single-phase alternating current battery module A and the single-phase alternating current battery module C can be reduced, the charge state balance effect is achieved, the short board efficiency is eliminated, and the utilization rate of the electric storage capacity of the energy storage system under the condition of three-phase load imbalance is ensured.
The three-phase balancing technology of the energy storage system can play a role in protecting the charge state balance among the single-phase alternating current battery modules when the three-phase load of the system is unbalanced, and ensures the utilization rate of the energy storage amount of the energy storage system under the condition of the three-phase load unbalance; meanwhile, the method has the function of power compensation, and can compensate and improve the output power of the phase line with heavier load; when the three single-phase alternating current battery modules form the energy storage system with three-phase inversion output, if one single-phase cross flow battery module fails to supply power due to some reason, the method can enable the standby power module to replace the failed module to supply power for output, and guarantees the three-phase power supply function of the system under the condition that the single-phase alternating current battery module fails. The technology improves the reliability of three-phase alternating current output of the energy storage system, realizes the balance of electric quantity among different single-phase alternating current battery modules, and has important significance for the energy storage system adopting the single-phase alternating current battery modules during three-phase alternating current power supply.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes, substitutions and alterations can be made by those skilled in the art without departing from the spirit of the invention, and these are all intended to be covered by the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the claims.
Claims (10)
1. A power backup module is applied to an energy storage system with alternating current output and is characterized by comprising a rectification filter circuit, a one-way inverter circuit and three control switches which are electrically connected in sequence; the input end of the rectification filter circuit is connected with the three external phase lines, and the output end of the one-way inverter circuit is respectively connected to the three external phase lines through three control switches.
2. An alternating current energy storage system, comprising: the system comprises a control unit, at least three single-phase flow battery modules and the standby power module according to claim 1; three phase lines and zero lines of the standby power module and all the single-phase alternating current battery modules are respectively connected in parallel and are connected with a three-phase alternating current load;
the single-phase alternating current battery module comprises a battery pack, a DA conversion module and a gating switch for selecting one of three phase lines for gating;
the control unit comprises a phase control interface, and the phase control interface respectively controls a control switch of the standby power module and a gating switch of the single-phase alternating-current battery module; during discharging, the control unit controls the three single-phase alternating-current battery modules to be respectively conducted to one phase line of the load, and controls the preparation electric modules to be alternatively conducted to one phase line.
3. The ac energy storage system of claim 2, wherein the single-phase current battery module further comprises a battery management circuit that manages charging and discharging of the battery pack.
4. The alternating current energy storage system of claim 3, wherein the DA conversion module further comprises an AD conversion unit; the AD conversion unit converts alternating current into direct current during charging to charge the battery pack.
5. The AC energy storage system of claim 3, wherein said control unit further comprises a communication interface communicatively coupled to the communication interface of the backup module and to the battery management circuit of each single-phase AC battery module.
6. The ac energy storage system of claim 2, wherein the battery pack comprises a plurality of series-connected and scalable cells.
7. A power supply method of an alternating current energy storage system, which is applied to the alternating current energy storage system as claimed in any one of claims 2 to 6, and comprises the following steps:
s11: setting the outputs of all the single-phase alternating-current battery modules to have the same amplitude and frequency and a phase difference of 120 degrees with each other;
s12: controlling the alternating current output of each single-phase alternating current battery module to be respectively connected to three different phase lines;
s13: and controlling the standby power module, setting the standby power module to have the same amplitude, frequency and phase as the phase line of the high liability, and connecting the standby power module with the phase line of the high liability for power compensation.
8. A power supply method of an alternating current energy storage system, which is applied to the alternating current energy storage system as claimed in any one of claims 2 to 6, and comprises the following steps:
s21: setting the outputs of all the single-phase alternating current battery modules to have the same amplitude and frequency and phase difference of 120 degrees between each other;
s22: controlling the alternating current output of each single-phase alternating current battery module to be respectively connected to three different phase lines;
s23: when the output of a single-phase current battery module is abnormal to cause phase failure, the standby power module is set to have the same amplitude, frequency and phase as the phase line of the phase failure, and is connected with the phase line of the phase failure to perform phase compensation.
9. A power supply method of an alternating current energy storage system, which is applied to the alternating current energy storage system as claimed in any one of claims 2 to 6, and comprises the following steps:
s31: setting the outputs of all the single-phase alternating-current battery modules to have the same amplitude and frequency and a phase difference of 120 degrees with each other;
s32: controlling the alternating current output of each single-phase alternating current battery module to be respectively connected to different phase lines;
s33: and monitoring the residual electric quantity of each single-phase alternating current battery module, and when the residual electric quantity difference between the two single-phase alternating current battery modules is greater than a preset value, exchanging the phase lines connected with the two single-phase alternating current battery modules through the standby power module.
10. The method according to claim 9, wherein step S33 comprises:
s331, controlling a standby power module to be connected to a first phase line for supplying power;
s332, controlling the first single-phase cross flow battery module to be disconnected with the first phase line;
s332, adjusting the output amplitude, frequency and phase of the first single-phase cross flow battery module to be the same as those of the second single-phase cross flow battery module, and connecting the first single-phase cross flow battery module with the second phase line for power supply;
s333: controlling the second single-phase cross flow battery module to be disconnected from the second phase line;
s334: adjusting the output amplitude, frequency and phase of the second single-phase cross flow battery module to be the same as those of the standby power module, and connecting the second single-phase cross flow battery module to the first phase line for power supply;
s335: and controlling the standby power module to be disconnected with the first phase line.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115694141A (en) * | 2023-01-04 | 2023-02-03 | 苏州浪潮智能科技有限公司 | External loop compensation device and method, system and medium thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115694141A (en) * | 2023-01-04 | 2023-02-03 | 苏州浪潮智能科技有限公司 | External loop compensation device and method, system and medium thereof |
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