CN114709890A - Method and device for balancing battery electric quantity in multi-machine parallel system - Google Patents

Abstract

The invention provides a method and a device for balancing electric quantity of batteries in a multi-machine parallel system. The method is applied to a target PCS which is any one PCS in a multi-machine parallel system, and comprises the following steps: acquiring an SOC real-time value of a battery cluster corresponding to a target PCS (personal communications system) and a real-time frequency of a bus in a multi-machine parallel system; determining a control origin of the droop control curve based on the SOC real-time value, the pre-stored SOC balance value and the rated power of the target PCS; the control origin is used for indicating the output power of the target PCS under the standard frequency, and the droop control curve is used for indicating the output power of the target PCS under different frequencies; and adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system so as to balance the electric quantity of the batteries in the multi-machine parallel system. The invention can realize the balance of the electric quantity of the battery in the multi-machine parallel system and ensure the safe operation of the multi-machine parallel system.

Description

Method and device for balancing battery electric quantity in multi-machine parallel system

Technical Field

The invention relates to the technical field of photovoltaic power generation, in particular to a method and a device for balancing electric quantity of batteries in a multi-machine parallel system.

Background

With the rapid development of new energy industries such as photovoltaic power generation, battery energy storage technologies, especially large-scale and large-capacity battery energy storage technologies, have received extensive attention and research. The energy storage converter (PCS) is an energy link for connecting the energy storage battery pack and the power grid, and can meet the power dispatching requirement of the power grid on the energy storage system through reasonable charge and discharge control on the energy storage battery pack.

When a multi-machine parallel system is operated in an off-line mode, a plurality of parallel PCS (Power systems) form a multi-machine parallel system, and each PCS is connected with a load in parallel in a voltage source mode to operate. Due to the difference of parameters of each PCS and the difference of the capacity of the corresponding battery pack, the residual capacity of the battery packs is different in the operation process. For example, PCS1 corresponds to a state of charge (SOC) value of 50% for the battery cluster, and PCS2 corresponds to an SOC value of 80% for the battery cluster. If the same power is distributed to the PCS1 and the PCS2, the PCS1 can be shut down due to power shortage, and the safe operation of the multi-machine parallel system is affected. Therefore, how to perform power distribution on each PCS when a multi-machine parallel system is in off-network operation needs to be solved urgently.

Disclosure of Invention

The invention provides a method and a device for balancing the electric quantity of batteries in a multi-machine parallel system, which can realize the balance of the electric quantity of the batteries in the multi-machine parallel system and ensure the safe operation of the multi-machine parallel system.

In a first aspect, the invention provides a method for balancing battery electric quantity in a multi-machine parallel system, which is applied to a target PCS (process control system), wherein the target PCS is any one PCS in the multi-machine parallel system, and the method comprises the following steps: acquiring an SOC real-time value of a battery cluster corresponding to a target PCS (personal communications system) and a real-time frequency of a bus in a multi-machine parallel system; determining a control origin of the droop control curve based on the SOC real-time value, the pre-stored SOC balance value and the rated power of the target PCS; the control origin is used for indicating the output power of the target PCS under the standard frequency, and the droop control curve is used for indicating the output power of the target PCS under different frequencies; and adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system so as to balance the electric quantity of the batteries in the multi-machine parallel system.

The invention provides a method for balancing battery electric quantity in a multi-machine parallel system, which is characterized in that a control origin of a droop control curve is determined based on an SOC real-time value and an SOC balance value of a battery cluster corresponding to a target PCS and the rated power of the target PCS, so that the droop control curve of the target PCS is determined, and then the output power of the target PCS is adjusted according to the droop control curve and the real-time frequency of a bus in the multi-machine parallel system. Because the real-time frequency of the bus in the multi-machine parallel system is directly related to the load, the output power of the target PCS determined based on the real-time frequency of the bus and the droop control curve can meet the requirement of the load, and the balance between the power provided by the multi-machine parallel system and the load requirement is realized. In the process, because the control origin of the droop control curve is determined by the SOC real-time value of the battery cluster corresponding to the target PCS, the difference of the electric quantity of each battery cluster in the multi-machine parallel system is fully considered, so that the method for balancing the electric quantity of the batteries in the multi-machine parallel system can balance the electric quantity of the batteries in the multi-machine parallel system and ensure the safe operation of the multi-machine parallel system.

It should be noted that, compared with a scheme of performing power distribution of each PCS based on a load and a scheme of determining an SOC balance value through communication between PCS, the method for balancing battery power in a multi-machine parallel system provided by the present invention does not need to communicate with other PCS, does not need to obtain required power of a load, can independently complete a determination process of output power of a target PCS by the target PCS, avoids a data transmission flow, and simplifies a control logic of battery power balancing in the multi-machine parallel system. Due to the fact that the data transmission process and the control logic in the battery electric quantity equalization process in the multi-machine parallel system are complex, errors may occur in the battery electric quantity equalization process, and system safety is affected.

In one possible implementation, determining a control origin of the droop control curve based on the real-time value of the SOC, the pre-stored equalization value of the SOC, and the rated power of the target PCS includes: determining a difference value between the SOC real-time value and the SOC balance value; determining the product of the difference value and the rated power of the target PCS as the output power of the target PCS at the standard frequency; the control origin of the droop control curve is determined based on the standard frequency and the output power of the target PCS at the standard frequency.

In one possible implementation, adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system includes: determining the output power corresponding to the real-time frequency based on the droop control curve; and adjusting the target PCS to the output power corresponding to the real-time frequency.

In one possible implementation, determining a control origin of the droop control curve based on the real-time value of the SOC, the pre-stored equalization value of the SOC, and the rated power of the target PCS further includes: and receiving a control instruction input from the outside, wherein the control instruction comprises an SOC balance value.

In a second aspect, an embodiment of the present invention provides an apparatus for equalizing battery power in a multi-machine parallel system, where the apparatus is applied to a target PCS, the target PCS is any PCS in the multi-machine parallel system, and the apparatus includes: a communication module and a processing module; the communication module is used for acquiring an SOC real-time value of a battery cluster corresponding to the target PCS and the real-time frequency of a bus in the multi-machine parallel system; the processing module is used for determining a control origin of the droop control curve based on the SOC real-time value, the pre-stored SOC balance value and the rated power of the target PCS; the PCS stores the same SOC balance value, the control origin is used for indicating the output power of the target PCS under the standard frequency, and the droop control curve is used for indicating the output power of the target PCS under different frequencies; and adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system so as to balance the electric quantity of the batteries in the multi-machine parallel system.

In a possible implementation manner, the processing module is specifically configured to determine a difference between the SOC real-time value and the SOC equilibrium value; determining the product of the difference value and the rated power of the target PCS as the output power of the target PCS at the standard frequency; the control origin of the droop control curve is determined based on the standard frequency and the output power of the target PCS at the standard frequency.

In a possible implementation manner, the processing module is specifically configured to determine an output power corresponding to the real-time frequency based on the droop control curve; and adjusting the target PCS to the output power corresponding to the real-time frequency.

In a possible implementation manner, the communication module is further configured to receive an externally input control instruction, where the control instruction includes an SOC equalization value.

In a third aspect, an embodiment of the present invention provides an electronic device, where the electronic device includes a memory and a processor, where the memory stores a computer program, and the processor is configured to call and execute the computer program stored in the memory to perform the steps of the method according to any one of the foregoing first aspect and possible implementation manners of the first aspect.

In a fourth aspect, the present invention provides a computer-readable storage medium, where a computer program is stored, where the computer program is configured to, when executed by a processor, implement the steps of the method according to the first aspect and any possible implementation manner of the first aspect.

For technical effects brought by any one of the implementation manners of the second aspect to the fourth aspect, reference may be made to technical effects brought by a corresponding implementation manner of the first aspect, and details are not described here.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic view of a scenario of a method for balancing battery power in a multi-machine parallel system according to an embodiment of the present invention;

fig. 2 is a schematic flow chart illustrating a method for balancing battery power in a multi-machine parallel system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a device for equalizing battery power in a multi-machine parallel system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In the description of the present invention, "/" means "or" unless otherwise specified, for example, a/B may mean a or B. "and/or" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" and "a plurality" mean two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion for ease of understanding.

Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules, but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments in conjunction with other drawings of the present invention.

Fig. 1 is a scene schematic diagram of a method for balancing battery power in a multi-machine parallel system according to an embodiment of the present invention. Fig. 1 shows the architecture of a multi-machine parallel system. The multi-machine parallel system comprises a plurality of PCS, battery clusters corresponding to the PCS one by one, an electric energy metering device and a load.

In some embodiments, the PCS is used to convert the energy stored in the battery cluster to power the load. For example, if the load is a dc load, the PCS may perform dc-dc conversion. If the load is an AC load, the PCS may perform DC-AC conversion. For example, the PCS in fig. 1 is a dc-ac type energy storage converter.

In some embodiments, each battery cluster is provided with a Battery Management System (BMS) responsible for controlling charging and discharging of the battery cluster and implementing functions such as battery cluster state estimation, etc., so as to implement intelligent management of the battery cluster and maintain each battery unit inside the battery cluster, prevent overcharge and overdischarge of the battery, prolong the service life of the battery, and monitor the state of the battery.

In some embodiments, the electric energy metering device is used for monitoring the operation condition of the load in real time. For example, the electric energy metering device can detect real-time voltage and real-time current of the load, so as to realize a metering function of load power.

It should be noted that, in the operation process of the multi-machine parallel system, the output power of each PCS is different due to the parameter difference of each PCS and the different capacity of the corresponding battery pack, so that the remaining power of the battery packs is different. When the remaining capacity difference between the battery packs is large, there may be a case where part of the PCS is shut down due to power shortage. After one or more PCS stops and exits the system, the load is supplied with power by other rest PCS, so that the whole multi-machine parallel system vibrates, and the safe and stable operation of the multi-machine parallel system is influenced.

In order to solve the above technical problem, an embodiment of the present invention provides a method for balancing battery power in a multi-machine parallel system. In order to implement the equalization method, an equalization device is arranged in each PCS, and the equalization method is executed. The balancing device calculates by acquiring the SOC real-time value of the target PCS, determines the control origin of the droop control curve of the target PCS, and adjusts the output power of the target PCS based on the droop control curve, so that the balance of the battery electric quantity and the balance of the load in the multi-machine parallel system are realized, and the safe and stable operation of the multi-machine parallel system is ensured.

As shown in fig. 2, an embodiment of the present invention provides a method for balancing battery power in a multi-machine parallel system, which is applied to a target PCS, where the target PCS is any PCS in the multi-machine parallel system shown in fig. 1. The equalizing method includes steps S201 to S203.

S201, acquiring an SOC real-time value of a battery cluster corresponding to the target PCS and real-time frequency of a bus in the multi-machine parallel system.

The target PCS is any one of a plurality of PCS in a multi-machine parallel system. Illustratively, as shown in fig. 1, the target PCS may be PCS1, or alternatively, PCS 2.

In some embodiments, the state of charge SOC is a physical quantity reflecting a state of remaining capacity of the battery, and the value is a ratio of a remaining capacity of the battery to a capacity of the battery.

In some embodiments, the SOC real-time value is used to represent the real-time power remaining in the battery cluster. For example, the SOC real-time value of PCS1 may be 30%. The SOC real-time value of PCS2 may be 80%.

As a possible implementation manner, the target PCS may send detection information to the corresponding BMS and receive a detection result fed back by the BMS. Wherein, the detection result comprises an SOC real-time value.

For example, PCS1 may send detection information to BMS1, which, after detecting the SOC real-time value, sends the detection result including the SOC real-time value to PCS1, thereby enabling PCS1 to acquire the SOC real-time value.

As another possible implementation, the target PCS may periodically receive state information of the battery cluster transmitted by the corresponding BMS, wherein the state information includes an SOC real-time value.

For example, the BMS1 may periodically perform state detection on the battery clusters and periodically transmit state information including SOC real-time values to the PCS 1. Thus enabling PCS1 to obtain the real-time value of the SOC.

It should be noted that the real-time frequency of the bus in the multi-machine parallel system is related to the output power and the load power of the multi-machine parallel system. Illustratively, when each PCS in the multi-machine parallel system operates at the first frequency, the sum of the output powers of each PCS in the multi-machine parallel system meets the load requirement. If the load is increased, the multi-machine parallel system adjusts the working frequency of each PCS, namely adjusts the real-time frequency of the bus, so that the output power of each PCS is changed to meet the increased load requirement.

As a possible implementation, the control device may directly detect the real-time frequency of the bus through the output of the target PCS.

S202, determining a control origin of the droop control curve based on the SOC real-time value, the pre-stored SOC balance value and the rated power of the target PCS.

The PCS stores the same SOC balance value, the control origin is used for indicating the output power of the target PCS under the standard frequency, and the droop control curve is used for indicating the output power of the target PCS under different frequencies.

It should be noted that the droop control curve is used to indicate the corresponding relationship between the operating frequency and the output power of the PCS. The control means may adjust the output power of the PCS based on the droop control curve.

It is understood that adjusting the droop control curve may change the correspondence between the operating frequency of the PCS and the output power. For example, by changing the control origin of the droop control curve, the adjustment of the corresponding relationship between the operating frequency and the output power of the PCS can be realized. For example, the output power of the PCS at the standard frequency is increased or decreased, and the correspondence relationship between the operating frequency and the output power of the PCS at other frequencies may be changed at the same time.

In the embodiment of the application, the SOC balance value is used for representing an expected value after the battery electric quantity is balanced.

As a possible implementation, the control device may directly obtain the pre-stored SOC balancing value from the memory.

As another possible implementation manner, before step S202, the control device may receive an externally input control instruction, which includes the SOC equalization value.

For example, the SOC equalization value may be 50%, or may be 60%. This is not limited in this application.

It can be understood that the SOC equalization values pre-stored or received by the PCS are the same, so that the battery clusters corresponding to the PCS can be equalized to the same level. In addition, the SOC equalization value may be smaller than the SOC real-time value, indicating that the battery cluster corresponding to the target PCS is in a discharge state during the equalization process. Alternatively, the SOC equalization value may be greater than the SOC real-time value, indicating that the battery cluster corresponding to the target PCS is in a charging state during the equalization process.

As a possible implementation, the control device may determine the control origin of the droop control curve based on steps a 1-A3.

And A1, determining the difference value of the SOC real-time value and the SOC balance value.

A2, determining the product of the difference and the rated power of the target PCS as the output power of the target PCS at the standard frequency.

For example, assuming that the SOC real-time value of the PCS1 is 80%, the SOC balance value is 50%, and the rated power of the PCS1 is 10kW, the output power of the PCS1 at the standard frequency is 3 kW. Assuming that the SOC real-time value of the PCS2 is 90%, the SOC balance value is 50%, and the rated power of the PCS2 is 10kW, the output power of the PCS2 at the standard frequency is 4kW, and the PCS2 is constantly 1kW higher than the output power of the PCS 1. Assuming that the SOC real-time value of the PCS3 is 20%, the SOC balance value is 50%, and the rated power of the PCS3 is 10kW, the output power of the PCS3 at the standard frequency is-3 kW, which means that the PCS3 receives the charging of other PCS.

A3, determining the control origin of the droop control curve based on the standard frequency and the output power of the target PCS at the standard frequency.

For example, the control device may directly determine the standard frequency and the output power of the target PCS at the standard frequency as the control origin of the droop control curve.

Therefore, the control device can determine the control origin of the droop control curve based on the SOC real-time value of the target PCS corresponding to the battery cluster, so that different PCS correspond to different control origins, the control origin of the droop control curve is determined based on the SOC real-time value of each PCS, the PCS in the multi-machine parallel system is different in output power based on the different residual electric quantity of the battery cluster, and the balance of the electric quantity of the batteries in the multi-machine parallel system is realized.

S203, adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system to balance the electric quantity of the battery in the multi-machine parallel system.

As a possible implementation manner, the control device may determine the output power corresponding to the real-time frequency based on the droop control curve, and adjust the target PCS to the output power corresponding to the real-time frequency.

As another possible implementation manner, the control device may directly adjust the operating frequency of the target PCS to the real-time frequency of the bus in the multi-machine parallel system based on the droop control curve, so as to complete the adjustment process of the target PCS.

The invention provides a method for balancing battery electric quantity in a multi-machine parallel system, which is characterized in that a control origin of a droop control curve is determined based on an SOC real-time value and an SOC balance value of a battery cluster corresponding to a target PCS and the rated power of the target PCS, so that the droop control curve of the target PCS is determined, and then the output power of the target PCS is adjusted according to the droop control curve and the real-time frequency of a bus in the multi-machine parallel system. Because the real-time frequency of the bus in the multi-machine parallel system is directly related to the load, the output power of the target PCS determined based on the real-time frequency of the bus and the droop control curve can meet the requirement of the load, and the balance between the power provided by the multi-machine parallel system and the load requirement is realized. In the process, the control origin of the droop control curve is determined by the SOC real-time value of the battery cluster corresponding to the target PCS, and the difference of the electric quantity of each battery cluster in the multi-machine parallel system is fully considered, so that the method for balancing the electric quantity of the batteries in the multi-machine parallel system can balance the electric quantity of the batteries in the multi-machine parallel system, and ensure the safe operation of the multi-machine parallel system.

It should be noted that, compared with a scheme of performing power distribution of each PCS based on a load and a scheme of determining an SOC balance value through communication between PCS, the method for balancing battery power in a multi-machine parallel system provided by the present invention does not need to communicate with other PCS, does not need to obtain required power of a load, can independently complete a determination process of output power of a target PCS by the target PCS, avoids a data transmission flow, and simplifies a control logic of battery power balancing in the multi-machine parallel system. Due to the fact that the data transmission process and the control logic in the battery electric quantity equalization process in the multi-machine parallel system are complex, errors can occur in the battery electric quantity equalization process, and system safety is affected, the method for equalizing the battery electric quantity in the multi-machine parallel system can reduce the probability of errors occurring in the equalization process, and safety and reliability of the multi-machine parallel system are improved.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.

Fig. 3 is a schematic structural diagram illustrating an apparatus for equalizing battery power in a multi-machine parallel system according to an embodiment of the present invention, where the apparatus is applied to a target PCS, and the target PCS is any PCS in the multi-machine parallel system, and the apparatus 300 includes: a communication module 301 and a processing module 302.

A communication module 301, configured to obtain an SOC real-time value of a battery cluster corresponding to a target PCS and a real-time frequency of a bus in a multi-machine parallel system;

a processing module 302, configured to determine a control origin of the droop control curve based on the SOC real-time value, a pre-stored SOC balance value, and a rated power of the target PCS; the control origin is used for indicating the output power of the target PCS under the standard frequency, and the droop control curve is used for indicating the output power of the target PCS under different frequencies; and adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system so as to balance the electric quantity of the batteries in the multi-machine parallel system.

In a possible implementation manner, the processing module 302 is specifically configured to determine a difference between the SOC real-time value and the SOC equilibrium value; determining the product of the difference value and the rated power of the target PCS as the output power of the target PCS at the standard frequency; the control origin of the droop control curve is determined based on the standard frequency and the output power of the target PCS at the standard frequency.

In a possible implementation, the processing module 302 is specifically configured to determine an output power corresponding to the real-time frequency based on the droop control curve; and adjusting the target PCS to the output power corresponding to the real-time frequency.

In a possible implementation manner, the communication module 301 is further configured to receive an externally input control instruction, where the control instruction includes an SOC balance value.

Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 4, the electronic apparatus 400 of this embodiment includes: a processor 401, a memory 402 and a computer program 403 stored in said memory 402 and executable on said processor 401. The processor 401 implements the steps in the above method embodiments, such as the steps S201 to S203 shown in fig. 2, when executing the computer program 403. Alternatively, the processor 401, when executing the computer program 403, implements the functions of each module/unit in each device embodiment described above, for example, the functions of the communication module 301 and the processing module 302 shown in fig. 3.

Illustratively, the computer program 403 may be partitioned into one or more modules/units that are stored in the memory 402 and executed by the processor 401 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 403 in the electronic device 400. For example, the computer program 403 may be divided into the communication module 301 and the processing module 302 shown in fig. 3.

The Processor 401 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The storage 402 may be an internal storage unit of the electronic device 400, such as a hard disk or a memory of the electronic device 400. The memory 402 may also be an external storage device of the electronic device 400, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the electronic device 400. Further, the memory 402 may also include both internal storage units and external storage devices of the electronic device 400. The memory 402 is used for storing the computer programs and other programs and data required by the terminal. The memory 402 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A method for balancing battery electric quantity in a multi-machine parallel system is characterized in that the method is applied to a target PCS (personal communications System), the target PCS is any PCS in the multi-machine parallel system, and the balancing method comprises the following steps:

acquiring an SOC real-time value of a battery cluster corresponding to a target PCS (personal communications system) and a real-time frequency of a bus in a multi-machine parallel system;

determining a control origin of a droop control curve based on the SOC real-time value, a pre-stored SOC balance value and the rated power of the target PCS; wherein, each PCS stores the same SOC balance value, the control origin is used for indicating the output power of the target PCS under a standard frequency, and the droop control curve is used for indicating the output power of the target PCS under different frequencies;

and adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system so as to balance the electric quantity of the battery in the multi-machine parallel system.

2. The method for equalizing battery power in a multi-machine parallel system according to claim 1, wherein the determining a control origin of a droop control curve based on the SOC real-time value, a pre-stored SOC equalization value, and a rated power of the target PCS comprises:

determining a difference between the SOC real-time value and the SOC balance value;

determining the product of the difference value and the rated power of the target PCS as the output power of the target PCS at the standard frequency;

determining a control origin of the droop control curve based on the standard frequency and the output power of the target PCS at the standard frequency.

3. The method for equalizing battery power in a multi-machine parallel system according to claim 1, wherein the adjusting the output power of the target PCS based on the droop control curve and a real-time frequency of a bus in the multi-machine parallel system comprises:

determining output power corresponding to the real-time frequency based on the droop control curve;

and adjusting the target PCS to the output power corresponding to the real-time frequency.

4. The method for equalizing battery power in a multi-machine parallel system according to any one of claims 1 to 3, wherein the determining a control origin of a droop control curve based on the SOC real-time value, a pre-stored SOC equalization value, and a rated power of the target PCS further comprises:

receiving an externally input control instruction, wherein the control instruction comprises the SOC balance value.

5. A balancing device for battery electric quantity in a multi-machine parallel system is characterized in that the balancing device is applied to a target PCS (Power control System), wherein the target PCS is any one PCS in the multi-machine parallel system, and the balancing device comprises: a communication module and a processing module;

the communication module is used for acquiring an SOC real-time value of a battery cluster corresponding to the target PCS and the real-time frequency of a bus in the multi-machine parallel system;

the processing module is used for determining a control origin of the droop control curve based on the SOC real-time value, a pre-stored SOC balance value and the rated power of the target PCS; wherein, each PCS stores the same SOC balance value, the control origin is used for indicating the output power of the target PCS under a standard frequency, and the droop control curve is used for indicating the output power of the target PCS under different frequencies; and adjusting the output power of the target PCS based on the droop control curve and the real-time frequency of the bus in the multi-machine parallel system so as to balance the electric quantity of the battery in the multi-machine parallel system.

6. The apparatus for equalizing battery power levels in a multi-machine parallel system according to claim 5,

the processing module is specifically configured to determine a difference between the SOC real-time value and the SOC equilibrium value; determining the product of the difference value and the rated power of the target PCS as the output power of the target PCS at the standard frequency; determining a control origin of the droop control curve based on the standard frequency and the output power of the target PCS at the standard frequency.

7. The apparatus for equalizing battery power levels in a multi-machine parallel system according to claim 5,

the processing module is specifically configured to determine an output power corresponding to the real-time frequency based on the droop control curve; and adjusting the target PCS to the output power corresponding to the real-time frequency.

8. The apparatus for equalizing battery power in a multi-machine parallel system according to any one of claims 5 to 7,

the communication module is further configured to receive a control instruction input from the outside, where the control instruction includes the SOC balance value.

9. An electronic device, characterized in that the electronic device comprises a memory storing a computer program and a processor for invoking and running the computer program stored in the memory to execute the method according to any one of claims 1 to 4.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.

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