CN115000986A - An energy management method and system for a photovoltaic power generation system supporting dual-mode operation - Google Patents

Abstract

The embodiment of the invention provides an energy management method and system for an optical storage power generation system supporting dual-mode operation, wherein the energy storage system can selectively work in a local generation self-balancing mode and a feeder network photovoltaic power fluctuation stabilizing mode by judging the level of a local load in the optical storage power generation system, and under the local generation self-balancing mode, the energy storage system can compensate the difference power after the action of photovoltaic power generation and the local load based on the energy storage and transfer capacity of the energy storage system, so that the local load does not need to absorb energy from a power grid; under the mode of feed net photovoltaic power fluctuation stabilization, the energy storage system can stabilize high-frequency fluctuation components in photovoltaic output power and limit the climbing rate.

Description

An energy management method and system for a photovoltaic power generation system supporting dual-mode operation

technical field

Embodiments of the present invention relate to the technical field of energy management of power generation systems, and in particular, to a method and system for energy management of photovoltaic power generation systems that support dual-mode operation.

Background technique

The development and utilization of renewable energy plays a key role in solving the energy crisis and environmental problems. In view of the obvious advantages of solar energy, such as easy access, huge amount and harmlessness, photovoltaic power generation has become one of the main ways to utilize renewable energy.

Due to seasonal and climatic factors, photovoltaic power generation has obvious volatility and uncertainty. With the expansion of the scale, it will have an impact on the power grid after being integrated into the power grid, thereby affecting the safe and stable operation of the power grid. Energy storage has the function of storing energy or releasing a certain amount of electric energy. It can store part of the electric energy during the peak period of photovoltaic power generation and the trough of electricity consumption, and release it during the period of trough power generation and peak electricity consumption, so as to achieve the purpose of shaving peaks and filling valleys. Considering the relatively expensive economic cost of energy storage, a single operation mode of peak shaving and valley filling cannot give full play to the value of energy storage. It is of good practical significance to seek multi-mode reuse of energy storage systems.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an energy management method and system for an optical storage power generation system that supports dual-mode operation, so as to solve the problem that a single peak-shaving and valley-filling operation mode cannot give full play to the value of energy storage and cannot improve the utilization efficiency of energy storage and overall economic issues.

In a first aspect, an embodiment of the present invention provides an energy management method for an optical storage and power generation system that supports dual-mode operation. The optical storage and power generation system includes a photovoltaic power source, an energy storage system, and a local load, and the method includes:

Step S1, obtaining the power of the photovoltaic power source, the energy storage system and the local load;

Step S2, if it is determined that the power of the local load exceeds a preset threshold, the energy storage system is controlled to enter a local generation and use self-balancing mode, and the power difference between the local load and the photovoltaic power source is used as the energy storage system If it is judged that the power of the local load does not exceed the preset threshold, the energy storage system is controlled to enter the grid-fed photovoltaic power fluctuation suppression mode, and the fluctuation in the power of the photovoltaic power source is determined based on the sliding average filtering algorithm component, so as to use the fluctuation component as the power reference value of the energy storage system;

Step S3, taking the power reference value as the set value, taking the measured energy storage output power as the feedback value, determining the reference current based on the PID controller, and determining the modulation of the three-phase inverter of the energy storage system based on the reference current Voltage.

Preferably, the photovoltaic power source is a single-stage photovoltaic power source, and the single-stage photovoltaic power source operates in a maximum power point tracking MPPT mode.

Preferably, the step S1 specifically includes:

Collect output voltage and output current information of the photovoltaic power source, the energy storage system and the local load to determine the output power of the photovoltaic power source, the energy storage system and the local load, and determine the local load The power difference between the load and the photovoltaic power source.

Preferably, in the step S2, the fluctuation component in the power of the photovoltaic power source is:

为k时刻光伏电源输出功率的波动分量，P_PV(k)为k时刻测得的光伏电源输出功率，N为滑动窗口内采样数据的个数，n∈[1，N]。In the above formula,

is the fluctuation component of the output power of the photovoltaic power supply at time k, P _PV (k) is the output power of the photovoltaic power supply measured at time k, N is the number of sampled data in the sliding window, n∈[1,N].

Preferably, in the step S2, when the energy storage system enters the local generation and use self-balancing mode, if the SOC of the energy storage system is greater than SOC _max or less than SOC _min , it is determined that the energy storage system is in an overshoot state or over-discharge state, set the power reference value of the energy storage system to 0.

Preferably, in the step S2, when the energy storage system enters the grid-fed photovoltaic power fluctuation stabilization mode, if the SOC of the energy storage system is greater than SOC _max or less than SOC _min , it is determined that the energy storage system is in overshoot state or over-discharge state, set the power reference value of the energy storage system to 0.

Preferably, the SOC of the energy storage system is:

In the above formula, SoC(k) is the SOC of the energy storage system at time k, E _batt is the energy storage capacity, and P _batt is the output power of the energy storage system.

In a second aspect, an embodiment of the present invention provides an energy management system for an optical storage and power generation system that supports dual-mode operation, including:

an acquisition module to acquire the power of the photovoltaic power source, the energy storage system and the local load;

The mode adjustment module, if judging that the power of the local load exceeds a preset threshold, controls the energy storage system to enter a local power generation self-balancing mode, and uses the power difference between the local load and the photovoltaic power source as the energy storage The power reference value of the system; if it is determined that the power of the local load does not exceed the preset threshold, the energy storage system is controlled to enter the grid-feeding photovoltaic power fluctuation suppression mode, and the power of the photovoltaic power source is determined based on the sliding average filtering algorithm. a fluctuation component, so as to use the fluctuation component as a power reference value of the energy storage system;

The energy storage management module takes the power reference value as a set value and the measured energy storage output power as a feedback value, determines the reference current based on the PID controller, and determines the three-phase inverter of the energy storage system based on the reference current modulation voltage.

In a third aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the program, the first embodiment of the present invention is implemented. The steps of the method for energy management of an optical storage and power generation system supporting dual-mode operation described in the aspect embodiment.

In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, supports dual-mode operation as described in the embodiment of the first aspect of the present invention The steps of an energy management method for a photovoltaic power generation system.

The embodiments of the present invention provide an energy management method and system for an optical storage and power generation system that supports dual-mode operation. By judging the local load level in the optical storage and power generation system, the energy storage system can choose to work in the local power generation self-balancing mode and the grid feeder. Photovoltaic power fluctuation stabilization mode, in the local generation and use self-balancing mode, the energy storage system can compensate the difference power between the photovoltaic power generation and the local load based on its energy storage and transfer capability, so that the local load does not need to absorb energy from the grid; In the power fluctuation smoothing mode, the energy storage system can smooth the high-frequency fluctuation components in the photovoltaic output power and limit the ramp rate.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a topological structure diagram of a photovoltaic power generation system according to an embodiment of the present invention;

FIG. 2 is a flow chart of a method for energy management of a photovoltaic power generation system supporting dual-mode operation according to an embodiment of the present invention;

3 is a local load curve according to an embodiment of the present invention;

4 is a comparison diagram of photovoltaic output active power and grid-connected active power according to an embodiment of the present invention;

5 is an energy storage output active power according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an entity structure according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The term "and/or" in this embodiment of the present application is only an association relationship to describe associated objects, indicating that there may be three kinds of relationships, for example, A and/or B, which may indicate that A exists alone, and A and B exist at the same time. , there are three cases of B alone.

The terms "first" and "second" in the embodiments of the present application are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of this application, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a system, product or device comprising a series of components or units is not limited to the listed components or units, but may optionally also include components or units not listed, or Other parts or units inherent in the equipment. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

Photovoltaic power generation has obvious volatility and uncertainty. With the expansion of the scale, it will cause an impact on the power grid after being integrated into the power grid, thereby affecting the safe and stable operation of the power grid. Energy storage has the function of storing energy or releasing a certain amount of electric energy. It can store part of the electric energy during the peak period of photovoltaic power generation and the trough of electricity consumption, and release it during the period of trough power generation and peak electricity consumption, so as to achieve the purpose of shaving peaks and filling valleys. Considering the relatively expensive economic cost of energy storage, a single operation mode of peak shaving and valley filling cannot give full play to the value of energy storage, and cannot improve the utilization efficiency and overall economy of energy storage.

Therefore, the embodiments of the present invention provide an energy management method for an optical storage and power generation system that supports dual-mode operation. By judging the local load level in the optical storage and power generation system, the energy storage system can choose to work in the local generation self-balancing mode and the grid-feeding photovoltaic system. Power fluctuation stabilization mode, in the self-balancing mode of local generation and use, the energy storage system can compensate the difference power between photovoltaic power generation and local load based on its energy storage and transfer capability, so that the local load does not need to absorb energy from the grid; the grid-feeding photovoltaic power In the fluctuation smoothing mode, the energy storage system can smooth the high-frequency fluctuation components in the photovoltaic output power and limit the ramp rate. The following will expand the description and introduction through multiple embodiments.

1 and 2 are an energy management method for a photovoltaic power generation system supporting dual-mode operation provided by an embodiment of the present invention. The photovoltaic power generation system includes a photovoltaic power source, an energy storage system, a local load, and a public power grid. The method include:

Step S1, obtaining the power of the photovoltaic power source, the energy storage system and the local load;

In this embodiment, the photovoltaic power source includes a photovoltaic array, and the energy storage system includes a battery, a three-phase inverter (DC/AC inverter), and an energy management system. The output voltage and output current information of the local load are used to determine the output power of the photovoltaic power source, the energy storage system and the local load, and to determine the power difference between the local load and the photovoltaic power source. The photovoltaic power source is a single-stage photovoltaic power source, and the single-stage photovoltaic power source works in an MPPT (Maximum Power Point Tracking, maximum power point tracking) mode.

Among them, the measured photovoltaic power source, energy storage system, and local load output voltage information and output current information can be transmitted to the energy management system of the photovoltaic power generation system via a low-bandwidth communication network, and the active power difference can be calculated in the energy management system.

Step S2, if it is judged that the power of the local load exceeds a preset threshold value P _{L_lim} , control the energy storage system to enter a local power generation self-balancing mode, and use the power difference between the local load and the photovoltaic power source as the energy storage system. The power reference value of the energy storage system, that is, the difference between the power of the local load and the photovoltaic output information will be used as the power reference value of the energy storage system; if it is judged that the power of the local load does not exceed the preset threshold P _{L_lim} , control the The energy storage system enters the grid-fed photovoltaic power fluctuation suppression mode, and determines the fluctuation component in the power of the photovoltaic power source based on the moving average filtering algorithm, so as to use the fluctuation component as the power reference value of the energy storage system;

Wherein, the fluctuation component in the power of the photovoltaic power source is:

为k时刻光伏电源输出功率的波动分量，P_PV(k)为k时刻测得的光伏电源输出功率，N为滑动窗口内采样数据的个数，n∈[1，N]。In the above formula,

is the fluctuation component of the output power of the photovoltaic power supply at time k, P _PV (k) is the output power of the photovoltaic power supply measured at time k, N is the number of sampled data in the sliding window, n∈[1,N].

When the energy storage system enters the local generation and use self-balancing mode, if the SOC of the energy storage system is greater than SOC _max or less than SOC _min , it is determined that the energy storage system is in an overshoot state or an overdischarge state, and the energy storage system is in an overcharge state or an overdischarge state. The power reference value of the system is set to 0.

When the energy storage system enters the grid-feeding photovoltaic power fluctuation stabilization mode, if the SOC of the energy storage system is greater than SOC _max or less than SOC _min , it is determined that the energy storage system is in an overshoot state or an overdischarge state, and the energy storage system is in an overshoot state or an overdischarge state. The power reference value of the energy system is set to 0.

Wherein, the energy storage SOC of the energy storage system is:

In the above formula, SoC(k) is the SOC of the energy storage system at time k, E _batt is the energy storage capacity, and P _batt is the output power of the energy storage system.

Step S3, taking the power reference value as the set value, taking the measured energy storage output power as the feedback value, and determining the reference current (I _dref , I _qref , respectively the d-axis and the q-axis of the current inner loop based on the PID controller) The given value), the modulation voltage of the three-phase inverter of the energy storage system is determined based on the reference current.

Figure 3 is the change curve of the local load within 10 minutes, Figure 4 is the active power output of the photovoltaic power supply and the grid-connected active power of the photovoltaic-storage combined power generation system, and Figure 5 is the active power output by the energy storage. Combining with Figures 3, 4, and 5, it can be seen that within 0-100s, the local load is lower than the threshold P _{L_lim} , and the energy storage system works in the "grid-feeding photovoltaic power fluctuation stabilization mode" to compensate for the high frequency in the output fluctuation power of the photovoltaic power supply. Part of the photovoltaic output meets the local load consumption, and the remaining power can be smoothed by energy storage and then injected into the distribution network, thus effectively improving the impact of the uncertainty of photovoltaic output on the distribution network; From 100s to 400s, when the local load increase threshold value P _{L_lim is} above, the energy storage system switches to the "local generation self-balancing mode". At this time, the active power injected into the grid is balanced to 0 by the energy storage, and the difference between the photovoltaic and the local load All the active power difference of the power storage is absorbed or provided by energy storage. This operation mode can achieve the purpose of local self-consumption under high load conditions; in 400s ~ 600s, the local load drops below the threshold P _{L_lim} again, and the energy storage system is again Automatically switch back to the "grid-feeding photovoltaic power fluctuation stabilization mode". It can be seen from the results of the examples that the energy management method of the photovoltaic power generation system supporting dual-mode operation provided by the present invention can adaptively switch the working mode according to the local load level, and improve the photovoltaic fluctuation through the coordinated operation of photovoltaic and energy storage. The influence of power on the distribution network improves the utilization efficiency of energy storage and the economy of electricity consumption.

Embodiments of the present invention further provide an energy management system for an optical storage and power generation system that supports dual-mode operation. Based on the energy management methods for an optical storage and power generation system that supports dual-mode operation in the foregoing embodiments, the method includes:

an acquisition module to acquire the power of the photovoltaic power source, the energy storage system and the local load;

The mode adjustment module, if judging that the power of the local load exceeds a preset threshold, controls the energy storage system to enter a local power generation self-balancing mode, and uses the power difference between the local load and the photovoltaic power source as the energy storage The power reference value of the system; if it is determined that the power of the local load does not exceed the preset threshold, the energy storage system is controlled to enter the grid-feeding photovoltaic power fluctuation suppression mode, and the power of the photovoltaic power source is determined based on the sliding average filtering algorithm. a fluctuation component, so as to use the fluctuation component as a power reference value of the energy storage system;

The energy storage management module takes the power reference value as a set value and the measured energy storage output power as a feedback value, determines the reference current based on the PID controller, and determines the three-phase inverter of the energy storage system based on the reference current modulation voltage.

Based on the same concept, an embodiment of the present invention also provides a schematic diagram of an entity structure. As shown in FIG. 6 , the server may include: a processor (processor) 810, a communications interface (Communications Interface) 820, a memory (memory) 830 and The communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 complete the communication with each other through the communication bus 840. The processor 810 may invoke the logic instructions in the memory 830 to execute the steps of the energy management method for the photovoltaic power generation system supporting dual-mode operation as described in the above embodiments. Examples include:

Step S1, obtaining the power of the photovoltaic power source, the energy storage system and the local load;

Step S2, if it is determined that the power of the local load exceeds a preset threshold, the energy storage system is controlled to enter a local generation and use self-balancing mode, and the power difference between the local load and the photovoltaic power source is used as the energy storage system If it is judged that the power of the local load does not exceed the preset threshold, the energy storage system is controlled to enter the grid-fed photovoltaic power fluctuation suppression mode, and the fluctuation in the power of the photovoltaic power source is determined based on the sliding average filtering algorithm component, so as to use the fluctuation component as the power reference value of the energy storage system;

Step S3, taking the power reference value as the set value, taking the measured energy storage output power as the feedback value, determining the reference current based on the PID controller, and determining the modulation of the three-phase inverter of the energy storage system based on the reference current Voltage.

In addition, the above-mentioned logic instructions in the memory 830 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

Based on the same concept, an embodiment of the present invention also provides a non-transitory computer-readable storage medium, where the computer-readable storage medium stores a computer program, and the computer program includes at least one piece of code, and the at least one piece of code can be executed by a main control device , to control the steps of the main control device to implement the energy management method of the photovoltaic power generation system supporting dual-mode operation as described in the above embodiments. Examples include:

Step S1, obtaining the power of the photovoltaic power source, the energy storage system and the local load;

Step S2, if it is determined that the power of the local load exceeds a preset threshold, the energy storage system is controlled to enter a local generation and use self-balancing mode, and the power difference between the local load and the photovoltaic power source is used as the energy storage system If it is judged that the power of the local load does not exceed the preset threshold, the energy storage system is controlled to enter the grid-fed photovoltaic power fluctuation suppression mode, and the fluctuation in the power of the photovoltaic power source is determined based on the sliding average filtering algorithm component, so as to use the fluctuation component as the power reference value of the energy storage system;

Step S3, taking the power reference value as the set value, taking the measured energy storage output power as the feedback value, determining the reference current based on the PID controller, and determining the modulation of the three-phase inverter of the energy storage system based on the reference current Voltage.

Based on the same technical concept, the embodiments of the present application further provide a computer program, which is used to implement the above method embodiments when the computer program is executed by a main control device.

The program may be stored in whole or in part on a storage medium packaged with the processor, or may be stored in part or in part in a memory not packaged with the processor.

Based on the same technical concept, an embodiment of the present application further provides a processor, and the processor is used to implement the above method embodiments. The above-mentioned processor may be a chip.

To sum up, the embodiments of the present invention provide an energy management method and system for an optical storage and power generation system that supports dual-mode operation. Balance mode and grid-feeding photovoltaic power fluctuation stabilization mode. In the local generation and use self-balancing mode, the energy storage system can compensate the difference power between photovoltaic power generation and local load based on its energy storage and transfer capability, so that the local load does not need to absorb from the grid. In the mode of smoothing the fluctuation of the grid-feeding photovoltaic power, the energy storage system can smooth the high-frequency fluctuation component in the photovoltaic output power and limit the ramp rate.

The various embodiments of the present invention can be arbitrarily combined to achieve different technical effects.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The computer program instructions, when loaded and executed on a computer, result in whole or in part of the processes or functions described herein. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk), among others.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented. The process can be completed by instructing the relevant hardware by a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed , which may include the processes of the foregoing method embodiments. The aforementioned storage medium includes: ROM or random storage memory RAM, magnetic disk or optical disk and other mediums that can store program codes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for energy management of a photovoltaic power generation system supporting dual mode operation, the photovoltaic power generation system comprising a photovoltaic power source, an energy storage system and a local load, the method comprising:

step S1, acquiring the power of the photovoltaic power supply, the energy storage system and the local load;

step S2, if the power of the local load is judged to exceed a preset threshold value, the energy storage system is controlled to enter a local transmitting self-balancing mode, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm, and taking the fluctuation component as a power reference value of the energy storage system;

and step S3, the power reference value is used as a set value, the actually measured energy storage output power is used as a feedback value, a reference current is determined based on the PID controller, and the modulation voltage of the energy storage system three-phase inverter is determined based on the reference current.

2. The method according to claim 1, wherein the photovoltaic power supply is a single-stage photovoltaic power supply, and the single-stage photovoltaic power supply operates in a Maximum Power Point Tracking (MPPT) mode.

3. The method for energy management of an optical storage and power generation system supporting dual-mode operation according to claim 1, wherein the step S1 specifically includes:

collecting output voltage and output current information of the photovoltaic power supply, the energy storage system and the local load to determine output power of the photovoltaic power supply, the energy storage system and the local load and determine a power difference between the local load and the photovoltaic power supply.

4. The energy management method for an optical storage power generation system supporting dual-mode operation according to claim 1, wherein in the step S2, the fluctuation component in the output power of the photovoltaic power supply is:

in the above formula, the first and second carbon atoms are,

is the fluctuation component of the output power of the photovoltaic power supply at the moment k, P _PV (k) The output power of the photovoltaic power supply measured at the moment k, N is the number of the sampling data in the sliding window, and N belongs to [1, N ∈]。

5. The energy management method of the optical storage power generation system supporting dual-mode operation according to claim 1, wherein in step S2, when the energy storage system enters a local self-balancing mode for generation, if the SOC of the energy storage system is greater than the SOC of the energy storage system _max Or less than SOC _min And judging that the energy storage system is in an overshoot state or an over-discharge state, and setting the power reference value of the energy storage system to 0.

6. The energy management method for an optical storage power generation system supporting dual-mode operation according to claim 1, wherein in step S2, when the energy storage system enters a feed-grid photovoltaic power fluctuation stabilizing mode, if the SOC of the energy storage system is greater than the SOC _max Or less than SOC _min Then judge what isAnd when the energy storage system is in an overshoot state or an over-discharge state, setting the power reference value of the energy storage system to 0.

7. The energy management method of the optical storage power generation system supporting dual-mode operation according to claim 5 or 6, wherein the measurement method of the energy storage system SOC is as follows:

in the above formula, SoC (k) is the energy storage system SOC at time k, E _batt For energy storage capacity, P _batt Is the output power of the energy storage system.

8. An optical storage power generation system energy management system supporting dual mode operation, comprising:

the acquisition module is used for acquiring the power of the photovoltaic power supply, the energy storage system and the local load;

the mode adjusting module is used for controlling the energy storage system to enter a local transmitting self-balancing mode if the power of the local load is judged to exceed a preset threshold value, and the power difference between the local load and the photovoltaic power supply is used as a power reference value of the energy storage system; if the power of the local load is judged not to exceed a preset threshold value, controlling the energy storage system to enter a feeder network photovoltaic power fluctuation stabilizing mode, determining a fluctuation component in the power of the photovoltaic power supply based on a moving average filtering algorithm, and taking the fluctuation component as a power reference value of the energy storage system;

and the energy storage management module is used for determining a reference current based on a PID (proportion integration differentiation) controller by taking the power reference value as a set value and taking the actually measured energy storage output power as a feedback value, and determining the modulation voltage of the energy storage system three-phase inverter based on the reference current.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method for energy management of a photovoltaic power generation system supporting dual mode operation according to any one of claims 1 to 7.

10. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the steps of the method for energy management of a photovoltaic energy storage and generation system supporting dual mode operation according to any one of claims 1 to 7.

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