Wind and light storage transient active power coordination method and device

Abstract

The invention discloses a wind and light storage transient active power coordination method and device, which are used for solving the problems in the prior art that the active or frequency level is not controlled, the active adjustment cannot be carried out, and the output degree of energy storage and a fan at the frequency stability of an extra-high voltage direct current system cannot be improved. The method comprises the following steps: acquiring load power of a power system, photovoltaic real-time maximum power generation power and wind power real-time maximum power generation power to further calculate a net load; if the net load is positive, performing transient active coordination on the power system by combining an energy storage working state judgment condition and a load removal strategy; and if the net load is negative, performing transient active power coordination on the power system in combination with an energy storage working state judgment condition and a wind-solar limited output strategy. Therefore, in combination with the net load condition and the energy storage working state, effective transient active power adjustment of the system can be realized, and the output degree of the energy storage and the fan at the frequency stability of the extra-high voltage direct current system can be improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy power system control technology, and in particular to a wind-solar-storage transient active power coordination method, a wind-solar-storage transient active power coordination device, an electronic device and a storage medium. Background Art

[0002] In power systems with a high proportion of wind power access, wind turbines and photovoltaic units have problems with frequency regulation and low voltage ride-through that cannot meet system requirements. Energy storage has the characteristics of fast response speed and convenient and flexible configuration. In this context, combining wind turbines, photovoltaic units and energy storage to improve frequency regulation and low voltage ride-through capabilities to meet the needs of high-proportion wind and solar access power systems is one of the important trends in the evolution and development of future power systems.

[0003] However, how to design a control strategy for the coordination of energy storage with wind turbines and photovoltaic units is an issue that needs to be explored and studied. To address this issue, one of the main methods currently used is the DC distribution network wind storage coordinated inertia control method. This method starts from the perspective of the DC distribution network and aims to provide inertial support for the DC distribution network system through the coordination of the rotor kinetic energy of the wind turbine and energy storage, improve the voltage overshoot problem caused by the use of virtual synchronous machine control for wind turbines, and reduce the demand for energy storage capacity.

[0004] However, the current method has the disadvantage of being unable to regulate active power. Specifically, this method mainly targets the voltage control level of the traditional DC system, and does not control the active power or frequency level, so it is impossible to regulate active power. At the same time, this method cannot improve the output of energy storage and wind turbines in the frequency stability of the UHV DC (referring to DC transmission and related technologies with voltage levels of ±800kV (or ±750kV) and above) system. Summary of the invention

[0005] The present invention provides a method for coordinating transient active power of wind, solar and storage, a device for coordinating transient active power of wind, solar and storage, an electronic device and a storage medium, which are used to solve or partially solve the technical problems that the existing related technologies do not control the active power or frequency level, cannot perform active power regulation, and cannot improve the output level of energy storage and wind turbines in the frequency stability of ultra-high voltage direct current systems.

[0006] The present invention provides a method for coordinating transient active power of wind, solar and photovoltaic power, which is applied to a power system simultaneously connected to energy storage, wind power and photovoltaic power. The method comprises:

[0007] Obtaining the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation of the power system;

[0008] Calculating a net load according to the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation;

[0009] If the net load is positive, the power system is coordinated with transient active power in combination with the energy storage working state judgment and the load shedding strategy;

[0010] If the net load is negative, transient active power coordination is performed on the power system in combination with the energy storage working status judgment and the wind and solar power output limitation strategy.

[0011] Optionally, the energy storage working state is a first energy storage working state, or a second energy storage working state, or a third energy storage working state; the first energy storage working state indicates that the current state of charge of the energy storage is 0≤SOC<0.2, the second energy storage working state indicates that the current state of charge of the energy storage is 0.2≤SOC≤0.8, and the third energy storage working state indicates that the current state of charge of the energy storage is 0.8<SOC≤1.

[0012] Optionally, if the net load is positive, combining the energy storage working state judgment and the load shedding strategy, performing transient active power coordination on the power system includes:

[0013] When the net load is positive, judging the energy storage working state based on the current charge state of the energy storage;

[0014] When the energy storage working state is the first energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the net load, the energy storage power limit coefficient and the energy storage maximum output power;

[0015] When the energy storage working state is the second energy storage working state, or the third energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the net load and the maximum output power of the energy storage;

[0016] When the energy storage output power is less than the net load, a difference is made between the net load and the maximum output power of the energy storage, and load shedding is performed on the power system according to the obtained power difference.

[0017] Optionally, when the net load is positive and the energy storage working state is the first energy storage working state, the control adjustment formula of the energy storage output power is as follows:

[0018]

[0019] When the net load is positive and the energy storage working state is the second energy storage working state or the third energy storage working state, the control adjustment formula of the energy storage output power is as follows:

[0020]

[0021] in, Indicates the energy storage output power; Indicates minimum value solution; Indicates net load; Indicates the maximum output power of energy storage; Indicates the energy storage limit power coefficient.

[0022] Optionally, if the net load is negative, combining the energy storage working state judgment and the wind and solar power output limitation strategy, the power system is coordinated for transient active power, including:

[0023] When the net load is negative, judging the energy storage working state based on the current charge state of the energy storage;

[0024] When the energy storage working state is the third energy storage working state, the energy storage output power of the energy storage is controlled to be zero, and the net load is evenly distributed by limiting the output of wind and solar power to control the net load to be zero;

[0025] When the energy storage working state is the second energy storage working state, the energy storage output power of the energy storage is controlled to remain unchanged, and the wind and solar power output is limited according to the power ratio of wind power to photovoltaic power;

[0026] When the energy storage working state is the first energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the negative number of the net load, the energy storage power limit coefficient and the energy storage maximum output power.

[0027] Optionally, when the net load is negative and the energy storage working state is the first energy storage working state, the method further includes:

[0028] After controlling and adjusting the energy storage output power of the energy storage in combination with the negative number of the net load, the energy storage power limit coefficient and the energy storage maximum output power, it is determined whether the adjusted energy storage output power is still less than the net load;

[0029] If so, the output of wind and solar power will be limited to achieve active power balance.

[0030] Optionally, when the energy storage working state is the first energy storage working state, or the second energy storage working state, the wind power and photovoltaic power operate in a maximum power tracking mode.

[0031] The present invention also provides a wind, solar and storage transient active power coordination device, which is applied to a power system simultaneously connected to energy storage, wind power and photovoltaic power, and the device comprises:

[0032] A power acquisition module is used to acquire the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation of the power system;

[0033] A net load calculation module, used to calculate the net load according to the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation;

[0034] A first transient active power coordination module is used to coordinate the transient active power of the power system in combination with the energy storage working state judgment and the load shedding strategy when the net load is positive;

[0035] The second transient active power coordination module is used to coordinate the transient active power of the power system when the net load is negative, combining the energy storage working state judgment and the wind and solar power output limitation strategy.

[0036] The present invention also provides an electronic device, the device comprising a processor and a memory:

[0037] The memory is used to store program code and transmit the program code to the processor;

[0038] The processor is used to execute the wind-solar-storage transient active power coordination method as described in any one of the above items according to the instructions in the program code.

[0039] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the wind-solar-storage transient active power coordination method as described in any one of the above items.

[0040] It can be seen from the above technical solutions that the present invention has the following advantages:

[0041] A method for wind, solar and storage transient active power coordination based on the working state of energy storage is proposed. First, the load power of the power system, the real-time maximum power generation of photovoltaic power and the real-time maximum power generation of wind power are obtained to further calculate the net load; if the net load is positive, the transient active power coordination of the power system is carried out in combination with the judgment of the working state of energy storage and the load removal strategy; if the net load is negative, the transient active power coordination of the power system is carried out in combination with the judgment of the working state of energy storage and the wind and solar power limiting output strategy. Therefore, by combining the net load situation and the working state of energy storage, introducing the output of the optimization stage by logical judgment, and adopting different active power coordination strategies for different situations, not only can the effective transient active power regulation of the system be achieved, but also the output degree of energy storage and wind turbines in the frequency stability of the UHV DC system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A flow chart of the steps of a method for coordinating transient active power of wind, solar and energy storage;

[0044] Figure 2 It is a schematic diagram of the overall process of a method for coordinating transient active power of wind, solar and energy storage;

[0045] Figure 3 This is a structural block diagram of a wind-solar-storage transient active power coordination device. DETAILED DESCRIPTION

[0046] The embodiments of the present invention provide a method for coordinating transient active power of wind, solar and storage, a device for coordinating transient active power of wind, solar and storage, an electronic device and a storage medium, which are used to solve or partially solve the technical problems that the existing related technologies do not control the active power or frequency level, cannot perform active power regulation, and cannot improve the output level of energy storage and wind turbines in the frequency stability of ultra-high voltage direct current systems.

[0047] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] As an example, one of the main methods currently used for the coordinated control of wind, solar and storage is the DC distribution network wind storage coordinated inertia control method. Starting from the perspective of the DC distribution network, this method aims to provide inertial support for the DC distribution network system by coordinating the rotor kinetic energy of the wind turbine and the energy storage, improve the voltage overshoot problem caused by the use of virtual synchronous machine control for wind turbines, and reduce the demand for energy storage capacity.

[0049] However, the current method has the disadvantage of being unable to adjust the active power. Specifically, this method mainly targets the voltage control level of the traditional DC system, and does not control the active power or frequency level, so it is impossible to adjust the active power. At the same time, this method cannot improve the output of energy storage and wind turbines in the frequency stability of the UHV DC system.

[0050] Therefore, one of the core invention points of the embodiment of the present invention is: from the perspective of coordinated output of new energy and energy storage, combined with the output characteristics of wind, solar and storage, the plan of wind power and photovoltaic is determined by the energy storage state, and the wind power output is determined according to the charging and discharging state and the charging state of the energy storage, and a wind, solar and storage transient active coordination method based on the energy storage state is proposed. First, the load power of the power system, the real-time maximum power generation power of photovoltaic power and the real-time maximum power generation power of wind power are obtained to further calculate the net load; if the net load is positive, the power system is transiently coordinated in active power in combination with the energy storage working state judgment and the load removal strategy; if the net load is negative, the power system is transiently coordinated in active power in combination with the energy storage working state judgment and the wind and solar power limiting output strategy. Therefore, by combining the net load situation and the energy storage working state, by introducing the logic judgment optimization stage output, different active coordination strategies are adopted for different situations, which can not only realize the effective transient active regulation of the system, but also improve the output level of energy storage and wind turbines in the frequency stability of the UHV DC system.

[0051] Through the technical solution of the present invention, the frequency stability problem caused by the high proportion of new energy in the sending-end power grid of the new energy DC system can be solved by coordinating the different outputs between energy storage and new energy, so that various frequency modulation resources can be fully utilized. And the technical solution of the present invention can improve the utilization efficiency of the energy storage device by comprehensively considering the rapid response of energy storage and the service life of energy storage, and at the same time can reduce the number of mechanical rotations of the new energy device to meet the system requirements and increase the service life. In addition, when both energy storage and new energy are disturbed or fail in the system, they can also cooperate with each other to eliminate the fault as soon as possible, so that the sending-end power grid maintains its frequency stability.

[0052] Reference Figure 1 , shows a flow chart of the steps of a wind-solar-storage transient active power coordination method provided by an embodiment of the present invention, the method is applied to a power system that is simultaneously connected to energy storage, wind power and photovoltaics, and the method may specifically include the following steps:

[0053] Step 101, obtaining the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation of the power system;

[0054] In practical applications, we can first define the real-time maximum power generation of the photovoltaic power generation system (hereinafter referred to as photovoltaic) and the wind turbine (hereinafter referred to as wind power) in the power system as and Among them, the real-time maximum power generation of wind power Subject to sunlight and wind speed conditions.

[0055] Then we can define the current output power of photovoltaic and wind power as and Furthermore, the power margins of photovoltaic and wind power can also be defined as and , and there are:

[0056]

[0057] Step 102, calculating the net load according to the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation;

[0058] Specifically, the calculation formula of the net load is as follows:

[0059]

[0060] in, is the load power. If the value is positive, it means that the energy storage battery needs to be discharged. If the value is negative, it means that the energy storage battery needs to be charged or the wind and solar power output is limited.

[0061] Step 103, if the net load is positive, combining the energy storage working state judgment and the load shedding strategy, perform transient active power coordination on the power system;

[0062] In conventional wind, solar and energy storage systems, wind power and photovoltaic power usually adopt the PQ control strategy (Power and Quantity Control Strategy, active power and reactive power control strategy) of Maximum Power Point Tracking (MPPT) to maximize the utilization of wind energy and solar energy. Energy storage is used to bear the power changes of the system and adopts a droop control strategy.

[0063] In the embodiment of the present invention, in order to reduce the equipment loss problem caused by the continuous charging and discharging of the energy storage battery, under the steady state condition, the control strategy is improved by introducing a logic judgment unit to optimize the stage output.

[0064] First, energy storage defines three working states according to the SOC (State of Charge, the ratio of the battery's state of charge / the remaining battery power to its full charge state) value. These three working states are: low voltage state (SOC<0.2), normal operation state (SOC is between 0.2 and 0.8), and high power state (SOC>0.8).

[0065] In a specific implementation, the energy storage working state is the first energy storage working state (corresponding to the low voltage state), or the second energy storage working state (corresponding to the normal operating state), or the third energy storage working state (corresponding to the high power state). The first energy storage working state indicates that the current state of charge of the energy storage is 0≤SOC<0.2, the second energy storage working state indicates that the current state of charge of the energy storage is 0.2≤SOC≤0.8, and the third energy storage working state indicates that the current state of charge of the energy storage is 0.8<SOC≤1.

[0066] Regardless of whether the net load is positive or negative, in a high power state, in order to prevent the energy storage battery from overcharging, it is necessary to limit the charging power of the energy storage battery and release the discharge power at the same time so that the battery can work in a normal operating state as soon as possible. In normal operating conditions, energy storage has good charging and discharging characteristics. At this time, the rapid response characteristics of energy storage can be fully utilized to achieve power balance. However, in order to reduce the workload of energy storage and increase its operating life, the control and adjustment of energy storage should be minimized in this state. In a low power state, the energy storage should be kept in a charging state as much as possible to play a power compensation role and make it work in the optimal state.

[0067] In actual application scenarios, when the net load When positive:

[0068] In the high power state, the energy storage output power is controlled and adjusted to When the energy storage output power Less than net load When the load is partially removed.

[0069] Under normal operation, wind power and photovoltaic power operate in maximum power tracking mode. At this time, the control adjusts the energy storage output power. When the energy storage output power (This is equivalent to the discharge power) is less than the net load When the load is partially removed.

[0070] In low power state, wind power and photovoltaic power operate in maximum power tracking mode. At this time, the control adjusts the energy storage output power When the energy storage output power (This is equivalent to the discharge power) is less than the net load When the load is reduced, some load needs to be removed. is the power limit coefficient of energy storage, which is specifically determined by OK. SOC is the current value of the energy storage battery capacity SOC, and 0.2 is the low power threshold. As the battery capacity decreases, its allowed discharge power gradually decreases to avoid over-discharge.

[0071] Combined with the previous discussion, in the specific implementation, if the net load is positive, the transient active power coordination of the power system is carried out in combination with the energy storage working state judgment and the load shedding strategy, which can be:

[0072] When the net load is positive, the energy storage operating state is first determined based on the current state of charge of the energy storage.

[0073] When the energy storage working state is the first energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the net load, the energy storage power limit coefficient and the energy storage maximum output power. Further, the control and adjustment formula of the energy storage output power is as follows:

[0074]

[0075] in, Indicates the energy storage output power; Indicates minimum value solution; Indicates net load; Indicates the maximum output power of energy storage; Indicates the energy storage limit power coefficient.

[0076] When the energy storage working state is the second energy storage working state, or the third energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the net load and the maximum output power of the energy storage. Further, the control and adjustment formula of the energy storage output power is as follows:

[0077]

[0078] After completing the control and adjustment of the energy storage output power, when the energy storage output power is less than the net load, the difference between the net load and the maximum output power of the energy storage is made, and the load of the power system is shed according to the obtained power difference.

[0079] It can be understood that when the net load is positive, after completing the control and regulation of the energy storage output power, when the energy storage output power is less than the net load, no matter what energy storage working state the energy storage is currently in, the calculation formula for the load to be removed is The difference is that in actual situations, the specific amount of load that needs to be removed depends on the actual operating conditions of the system.

[0080] Step 104: If the net load is negative, the power system is transiently coordinated in active power based on the energy storage working status judgment and the wind and solar power output limitation strategy.

[0081] In actual application scenarios, when the net load When negative:

[0082] In the high power state, the energy storage output power is controlled and adjusted to zero. At the same time, the wind and solar power output is limited to evenly distribute the net load so that the net load is zero, thus achieving the purpose of active power balance in the system.

[0083] Under normal operating conditions, wind power and photovoltaic power operate in maximum power tracking mode. The output power of energy storage remains unchanged to minimize the adjustment of energy storage. At this time, wind and solar power operate at limited power, and the load is limited according to the power ratio, so that wind power and photovoltaic power have a certain power adjustment space, laying the foundation for participating in system power support.

[0084] For example, when the net load is negative, the system active demand is small. Assume that the output power of wind power and photovoltaic power is 5MW (power unit: megawatt) and 4MW respectively, and the capacity of wind turbine and photovoltaic power is 10MW. At this time, the power should be limited according to the power ratio of 5:4, so that both wind power and photovoltaic power have a certain power adjustment space.

[0085] In the low power state, wind power and photovoltaic power operate in the maximum power tracking mode. At this time, the control and adjustment of energy storage output power is When the energy storage output power (This is equivalent to the charging power) is still less than the negative net load When the power is high, the output of wind and solar power is limited to achieve active power balance.

[0086] Combined with the previous discussion, in the specific implementation, if the net load is negative, the transient active power coordination of the power system is carried out in combination with the energy storage working state judgment and the wind and solar power limiting output strategy, which can be:

[0087] When the net load is negative, the energy storage operating state is first determined based on the current state of charge of the energy storage.

[0088] When the energy storage working state is the third energy storage working state, the energy storage output power is controlled and adjusted to be zero, and the output is limited by wind and solar power to evenly distribute the net load to control the net load to be zero.

[0089] When the energy storage working state is the second energy storage working state, the energy storage output power is controlled to remain unchanged, and the wind and solar power output is limited according to the power ratio of wind power to photovoltaic power.

[0090] When the energy storage working state is the first energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the negative number of the net load, the energy storage power limit coefficient and the energy storage maximum output power. Further, the control and adjustment formula of the energy storage output power is as follows:

[0091]

[0092] Furthermore, after controlling and adjusting the energy storage output power of the energy storage in combination with the negative number of the net load, the energy storage power limit coefficient and the maximum output power of the energy storage, it is determined whether the adjusted energy storage output power is still less than the net load; if so, the output of wind and solar power is limited to balance the active power.

[0093] Therefore, based on the positive and negative conditions of the net load, according to the three working states of the energy storage and combined with maximum power tracking, different output optimization methods are set to construct a wind, solar and storage steady-state active power coordinated control strategy based on the energy storage state and realize active power coordinated control.

[0094] Combined with the previous content, it can be seen that regardless of whether the net load is positive or negative, when the energy storage working state is the first energy storage working state (low voltage state) or the second energy storage working state (normal operating state), wind power and photovoltaics operate in the maximum power tracking mode. When the energy storage working state is the third energy storage working state (high power state), it is not set that wind power and photovoltaics also operate in the maximum power tracking mode. Compared with the relatively unified operation control strategy of wind power and photovoltaic modes in conventional wind-solar-storage systems, the operation control strategy of wind power and photovoltaics in the embodiment of the present invention is set under the consideration of the energy storage state of energy storage. Compared with the currently commonly used operation control strategy, it not only has better flexibility, but also can improve the utilization efficiency of the energy storage device.

[0095] It should be noted that, in order to enable those skilled in the art to better distinguish data of the same type but with different actual meanings, the embodiments of the present invention use terms such as first and second to distinguish and explain some technical features. The terms such as first and second are only used to distinguish data and have no other special meanings. It can be understood that the present invention is not limited to this.

[0096] In an embodiment of the present invention, a method for coordinating transient active power of wind, solar and storage based on energy storage status is proposed. In combination with the net load situation and the working state of energy storage, by introducing the output of the optimization stage through logical judgment, different active coordination strategies are adopted for different situations, which can not only realize the effective transient active power regulation of the system, but also improve the output of energy storage and wind turbines in the frequency stability of the UHV DC system. Through the technical solution of the present invention, in order to solve the frequency stability problem caused by the high proportion of new energy in the sending-end power grid of the new energy DC system, the different outputs between energy storage and new energy can be coordinated, so that various frequency regulation resources can be fully utilized. And the technical solution of the present invention can improve the utilization efficiency of the energy storage device by comprehensively considering the rapid response of energy storage and the service life of energy storage, and at the same time can reduce the number of mechanical rotations of the new energy device to meet the system requirements and increase the service life. In addition, when both energy storage and new energy are disturbed or fail in the system, they can also cooperate with each other to eliminate the fault as soon as possible, so that the sending-end power grid maintains its frequency stability.

[0097] For better explanation, refer to Figure 2 , showing a schematic diagram of the overall process of a method for wind-solar-storage transient active power coordination provided by an embodiment of the present invention. It should be pointed out that this embodiment only briefly describes the general process of wind-solar-storage transient active power coordination, and the specific implementation process of each step can be understood by referring to the relevant content in the aforementioned embodiment, which will not be repeated here. It can be understood that the present invention does not limit this.

[0098] Obtaining the load power of the power system , Photovoltaic real-time maximum power generation And the real-time maximum power generation of wind power , and according to the load power , Photovoltaic real-time maximum power generation And the real-time maximum power generation of wind power , calculate the net load ;

[0099] When the net load When positive:

[0100] Based on the current state of charge of the energy storage, determine the working state of the energy storage;

[0101] When the energy storage is in low voltage state (SOC < 0.2), wind power and photovoltaic power are operated in maximum power tracking mode, combined with net load , Energy storage power limit coefficient And the maximum output power of energy storage , control and adjust the energy storage output power ;

[0102] When the energy storage is in normal operation (SOC is between 0.2 and 0.8), wind power and photovoltaic power are operating in maximum power tracking mode, combined with net load And the maximum output power of energy storage , control and adjust the energy storage output power ;

[0103] When the energy storage working state is high power state (SOC>0.8), combined with the net load And the maximum output power of energy storage , control and adjust the energy storage output power ;

[0104] When the energy storage output power Less than net load Based on the net load Maximum output power of energy storage Make a difference and use the power difference obtained Load shedding on the power system.

[0105] When the net load When negative:

[0106] Based on the current state of charge of the energy storage, determine the working state of the energy storage;

[0107] When the energy storage working state is in a high power state (SOC>0.8), the energy storage output power is controlled and adjusted. Zero, and limit the output of wind and solar power to evenly distribute the net load , to control the net load is zero;

[0108] When the energy storage is in normal operation (SOC is between 0.2 and 0.8), wind power and photovoltaic power are operated in maximum power tracking mode, controlling the energy storage output power. Remain unchanged and limit the output of wind and solar power according to the power ratio of wind power to photovoltaic power;

[0109] When the energy storage is in low voltage state (SOC < 0.2), wind power and photovoltaic power are operated in maximum power tracking mode, combined with net load Negative number, energy storage power limit coefficient And the maximum output power of energy storage , control and adjust the energy storage output power .

[0110] In combination with the net load Negative number, energy storage power limit coefficient And the maximum output power of energy storage , control and adjust the energy storage output power Afterwards, determine the output power of the energy storage after adjustment Is it still less than the net load? ; If so, the output of wind and solar power is limited to achieve active power balance.

[0111] Reference Figure 3 , shows a structural block diagram of a wind-solar-storage transient active power coordination device provided by an embodiment of the present invention, the device is applied to a power system simultaneously connected to energy storage, wind power and photovoltaics, and the device may specifically include:

[0112] The power acquisition module 301 is used to acquire the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation of the power system;

[0113] A net load calculation module 302, configured to calculate the net load according to the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation;

[0114] A first transient active power coordination module 303 is used to coordinate the transient active power of the power system in combination with the energy storage working state judgment and the load shedding strategy when the net load is positive;

[0115] The second transient active power coordination module 304 is used to coordinate the transient active power of the power system when the net load is negative, combining the energy storage working state judgment and the wind and solar power output limitation strategy.

[0116] In an optional embodiment, the energy storage working state is a first energy storage working state, or a second energy storage working state, or a third energy storage working state; the first energy storage working state indicates that the current state of charge of the energy storage is 0≤SOC<0.2, the second energy storage working state indicates that the current state of charge of the energy storage is 0.2≤SOC≤0.8, and the third energy storage working state indicates that the current state of charge of the energy storage is 0.8<SOC≤1.

[0117] In an optional embodiment, the first transient active power coordination module 303 includes:

[0118] A first energy storage working state judgment module, used for judging the energy storage working state based on the current charge state of the energy storage when the net load is positive;

[0119] A first energy storage output power adjustment module, used for controlling and adjusting the energy storage output power of the energy storage in combination with the net load, the energy storage power limit coefficient and the energy storage maximum output power when the energy storage working state is the first energy storage working state;

[0120] A second energy storage output power adjustment module, used for controlling and adjusting the energy storage output power of the energy storage in combination with the net load and the maximum output power of the energy storage when the energy storage working state is the second energy storage working state or the third energy storage working state;

[0121] A load shedding module is used to perform load shedding on the power system based on the difference between the net load and the maximum output power of the energy storage when the energy storage output power is less than the net load, and according to the obtained power difference.

[0122] In an optional embodiment, when the net load is positive and the energy storage working state is the first energy storage working state, the control adjustment formula of the energy storage output power is as follows:

[0123]

[0124] When the net load is positive and the energy storage working state is the second energy storage working state or the third energy storage working state, the control adjustment formula of the energy storage output power is as follows:

[0125]

[0126] in, Indicates the energy storage output power; Indicates minimum value solution; Indicates net load; Indicates the maximum output power of energy storage; Indicates the energy storage limit power coefficient.

[0127] In an optional embodiment, the second transient active power coordination module 304 includes:

[0128] A second energy storage working state judgment module, used for judging the energy storage working state based on the current charge state of the energy storage when the net load is negative;

[0129] A third energy storage output power adjustment module is used to control and adjust the energy storage output power of the energy storage to zero when the energy storage working state is the third energy storage working state, and evenly share the net load by limiting the output of wind and solar power to control the net load to zero;

[0130] An energy storage output power maintaining module, used for controlling the energy storage output power of the energy storage to remain unchanged when the energy storage working state is the second energy storage working state, and limiting the wind and solar power output according to the power ratio of wind power to photovoltaic power;

[0131] The fourth energy storage output power adjustment module is used to control and adjust the energy storage output power of the energy storage in combination with the negative number of the net load, the energy storage power limit coefficient and the maximum output power of the energy storage when the energy storage working state is the first energy storage working state.

[0132] In an optional embodiment, when the net load is negative and the energy storage working state is the first energy storage working state, the fourth energy storage output power adjustment module is further used to:

[0133] After controlling and adjusting the energy storage output power of the energy storage in combination with the negative number of the net load, the energy storage power limit coefficient and the energy storage maximum output power, it is determined whether the adjusted energy storage output power is still less than the net load;

[0134] If so, the output of wind and solar power will be limited to achieve active power balance.

[0135] In an optional embodiment, when the energy storage working state is the first energy storage working state, or the second energy storage working state, the wind power and photovoltaic power operate in a maximum power tracking mode.

[0136] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the aforementioned method embodiment.

[0137] An embodiment of the present invention further provides an electronic device, the device comprising a processor and a memory:

[0138] The memory is used to store the program code and transmit the program code to the processor;

[0139] The processor is used to execute the wind-solar-storage transient active power coordination method of any embodiment of the present invention according to the instructions in the program code.

[0140] An embodiment of the present invention further provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute the wind-solar-storage transient active power coordination method of any embodiment of the present invention.

[0141] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0142] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0143] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0144] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0145] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0146] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for coordinating transient active power of wind, solar and energy storage, characterized in that: Applied to a power system that is simultaneously connected to energy storage, wind power, and photovoltaic power, the method includes: Obtaining the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation of the power system; Calculating a net load based on the load power, the real-time maximum photovoltaic power generation power, and the real-time maximum wind power power generation power; If the net load is positive, performing transient active power coordination on the power system in combination with the energy storage working state judgment and the load shedding strategy; If the net load is negative, transient active power coordination is performed on the power system in combination with the energy storage working status judgment and the wind and solar power output limitation strategy.

2. The wind, solar and energy storage transient active power coordination method according to claim 1 is characterized in that: The energy storage working state is a first energy storage working state, or a second energy storage working state, or a third energy storage working state; the first energy storage working state indicates that the current state of charge of the energy storage is 0≤SOC<0.2, the second energy storage working state indicates that the current state of charge of the energy storage is 0.2≤SOC≤0.8, and the third energy storage working state indicates that the current state of charge of the energy storage is 0.8<SOC≤1.

3. The wind, solar and storage transient active power coordination method according to claim 2, characterized in that: If the net load is positive, then combining the energy storage working state judgment and the load shedding strategy, transient active power coordination is performed on the power system, including: When the net load is positive, determining the energy storage operating state based on the current state of charge of the energy storage; When the energy storage working state is the first energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the net load, the energy storage power limit coefficient and the energy storage maximum output power; When the energy storage working state is the second energy storage working state or the third energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the net load and the maximum output power of the energy storage; When the energy storage output power is less than the net load, a difference is made between the net load and the maximum output power of the energy storage, and load shedding is performed on the power system according to the obtained power difference.

4. The wind, solar and energy storage transient active power coordination method according to claim 3 is characterized in that: When the net load is positive and the energy storage working state is the first energy storage working state, the control adjustment formula of the energy storage output power is as follows: When the net load is positive and the energy storage working state is the second energy storage working state or the third energy storage working state, the control adjustment formula of the energy storage output power is as follows: in, Indicates the energy storage output power; Indicates minimum value solution; Indicates net load; Indicates the maximum output power of energy storage; Indicates the energy storage power limit coefficient.

5. The wind, solar and energy storage transient active power coordination method according to claim 2, characterized in that: If the net load is negative, the power system is coordinated for transient active power in combination with the energy storage working state judgment and the wind and solar power output limitation strategy, including: When the net load is negative, determining the energy storage operating state based on the current state of charge of the energy storage; When the energy storage working state is the third energy storage working state, the energy storage output power of the energy storage is controlled to be zero, and the net load is evenly distributed by limiting the output of wind and solar power to control the net load to be zero; When the energy storage working state is the second energy storage working state, the energy storage output power of the energy storage is controlled to remain unchanged, and the wind and solar power output is limited according to the power ratio of wind power to photovoltaic power; When the energy storage working state is the first energy storage working state, the energy storage output power of the energy storage is controlled and adjusted in combination with the negative number of the net load, the energy storage power limit coefficient and the energy storage maximum output power.

6. The wind, solar and energy storage transient active power coordination method according to claim 5, characterized in that: When the net load is negative and the energy storage working state is the first energy storage working state, the method further includes: After controlling and adjusting the energy storage output power of the energy storage in combination with the negative number of the net load, the energy storage power limit coefficient, and the maximum output power of the energy storage, determining whether the adjusted energy storage output power is still less than the net load; If so, the output of wind and solar power will be limited to achieve active power balance.

7. The method for coordinating transient active power of wind, solar and energy storage according to any one of claims 3 to 6, characterized in that: When the energy storage working state is the first energy storage working state or the second energy storage working state, the wind power and photovoltaic power operate in a maximum power point tracking mode.

8. A wind, solar and storage transient active power coordination device, characterized in that: Applicable to a power system that is simultaneously connected to energy storage, wind power, and photovoltaic power, the device includes: A power acquisition module is used to obtain the load power, the real-time maximum photovoltaic power generation and the real-time maximum wind power generation of the power system; A net load calculation module, configured to calculate the net load based on the load power, the real-time maximum photovoltaic power generation power, and the real-time maximum wind power power generation power; A first transient active power coordination module is configured to, when the net load is positive, perform transient active power coordination on the power system in combination with the energy storage working state judgment and the load shedding strategy; The second transient active power coordination module is used to coordinate the transient active power of the power system when the net load is negative, combining the energy storage working state judgment and the wind and solar power output limitation strategy.

9. An electronic device, characterized in that: The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the wind-solar-storage transient active power coordination method according to any one of claims 1-7 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store program code, and the program code is used to execute the wind-solar-storage transient active power coordination method according to any one of claims 1-7.

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