Power coordination control method, device, equipment and medium

Abstract

The invention relates to a power coordination control method, device, equipment and medium, and the method comprises the steps: obtaining the states of a grid-connected port and an interconnection port of a rural area micro-grid integrated interface device; determining the operation mode of the rural area micro-grid integrated interface device according to the states of the grid-connected port and the interconnection port; determining the internal power flow condition of the rural area micro-grid integrated interface device according to the net power of the rural area micro-grid integrated interface device and the operation mode of the rural area micro-grid integrated interface device; and according to the internal power flow condition of the rural area micro-grid integrated interface device, carrying out coordination control on the converter of each port of the rural area micro-grid integrated interface device. According to the invention, it can be ensured that the rural area micro-grid integrated interface device can coordinate the power of each port.

Description

Technical Field

[0001] The present invention relates to the technical field of power system operation management, and in particular to a power coordination control method, device, equipment and medium. Background Art

[0002] The living standards of rural residents have significantly improved, and the demand for electricity supply has shown an increasing and diversified trend. Although the construction of rural power grids has achieved remarkable results in recent years and the overall power supply capacity has been significantly improved, some rural areas are still facing the challenge of relatively insufficient power supply capacity and difficulty in meeting the rapidly growing electricity demand. Given that rural areas are vast and rich in distributed resources such as photovoltaics and biogas, making full use of them can effectively alleviate the electricity shortage in local lighting and agricultural production. However, due to the widespread distribution of distributed resources in various corners of rural areas and the lack of an effective integration mechanism, their utilization efficiency is low and it is difficult to give full play to their due value. At the same time, due to the intermittent and uncertain nature of distributed resource power generation and the variability of loads, the voltage and frequency of rural microgrids will fluctuate, making it difficult to meet the electricity needs of users.

[0003] In order to solve the above problems, the integrated interface device of rural microgrid came into being, becoming a key bridge connecting various distributed resources with end users and promoting the optimization and upgrading of rural energy structure. This device realizes the centralized access and efficient integration of rural distributed resources through innovative technical means, which not only enables various distributed resources such as photovoltaic power generation and biogas power generation to be connected to the grid, but also solves the problem of abandoned light caused by unstable output of distributed resources by accessing energy storage. At the same time, by interconnecting two or more devices, a flexible microgrid is constructed, and the intelligent allocation and balance of loads between multiple microgrids is realized, which greatly enhances the continuity and stability of the rural power supply system. However, the power coordination control method of the existing multi-port converter cannot adapt to the scenario of multiple distributed resources access to the rural microgrid, so a power coordination control method suitable for the integrated interface device of the rural microgrid is continued. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a power coordination control method, device, equipment and medium, which can ensure that the rural microgrid integrated interface device can coordinate the power of each port.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a power coordination control method, comprising the following steps:

[0006] Obtain the status of the grid-connected port and interconnected port of the rural microgrid integrated interface device;

[0007] Determine the operation mode of the rural area microgrid integrated interface device according to the status of the grid-connected port and the interconnection port;

[0008] Determine the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device;

[0009] The converters of each port of the rural area microgrid integrated interface device are coordinated and controlled according to the internal power flow conditions of the rural area microgrid integrated interface device.

[0010] Determining the operation mode of the rural area microgrid integrated interface device according to the states of the grid-connected port and the interconnected port specifically includes:

[0011] When the grid-connected port and the interconnection port are both in the connected state, determining that the operation mode of the rural area microgrid integrated interface device is the distribution-micro interconnection mode;

[0012] When the grid-connected port is in an access state and the interconnection port is in an unaccessed state, determining that the operation mode of the rural area microgrid integrated interface device is a distribution network direct connection mode;

[0013] When the grid-connected port is in an unconnected state and the interconnection port is in an connected state, determining that the operation mode of the rural area microgrid integrated interface device is a microgrid interconnection mode;

[0014] When the grid-connected port and the interconnection port are both in an unconnected state, it is determined that the operation mode of the rural area microgrid integrated interface device is a self-balancing mode.

[0015] The determining of the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device specifically includes:

[0016] When the operation mode of the rural area microgrid integrated interface device is the distribution micro-interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is greater than the upper limit of the state of charge, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; It is transmitted to the power grid through the grid-connected port; if the net power of the rural area microgrid integrated interface device is less than zero, the shortfall is powered by the energy storage; if the state of charge of the energy storage is less than the discharge threshold, the shortfall is powered by another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the shortfall is powered by the power grid through the grid-connected port.

[0017] The method further comprises: determining the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device;

[0018] When the operation mode of the rural area microgrid integrated interface device is the distribution network direct connection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the charge state of the energy storage is greater than the charging threshold, the excess electric energy is transmitted to the power grid through the grid-connected port or the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage is used to supply the shortfall; if the charge state of the energy storage is less than the discharge threshold, the power grid is used to supply the shortfall through the grid-connected port.

[0019] The method further comprises: determining the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device;

[0020] When the operation mode of the rural area microgrid integrated interface device is the microgrid interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is greater than the upper limit of the state of charge, the output of distributed power generation is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage supplies power to the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the other rural area microgrid integrated interface device supplies power to the shortfall through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the load is cut off in order of importance.

[0021] The method further comprises: determining the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device;

[0022] When the operation mode of the rural area microgrid integrated interface device is the self-balancing mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the charge state of the energy storage is greater than the charging threshold, the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage will supply the shortfall; if the charge state of the energy storage is less than the discharge threshold, the load will be cut off in order of importance.

[0023] The coordinated control of the converters of each port of the rural area microgrid integrated interface device according to the internal power flow of the rural area microgrid integrated interface device specifically includes:

[0024] For the grid-connected port converter and the AC generation port converter, the actual active power value and reactive power value are calculated using the output voltage and current of the grid-connected port and the AC generation port, and the active loop and reactive loop are controlled according to the virtual synchronous motor control to realize active frequency modulation and reactive voltage regulation. Then, the cascade voltage outer loop and current inner loop are used to generate pulses to drive the switch tube, thereby realizing the control of the grid-connected port converter and the AC generation port converter;

[0025] For the DC power generation port converter, the output voltage and current of the DC power generation port are controlled by maximum power point tracking;

[0026] For the energy storage port converter, the DC bus voltage is stabilized by adaptive droop control based on the state of charge, and the current is tracked and controlled by the current inner loop;

[0027] For the DC charging pile port converter, when the energy storage is working normally, the power outer loop charges the electric vehicle, and the current inner loop tracks and controls the current; when the energy storage fails or an abnormality occurs, constant voltage control is used to stabilize the DC bus voltage;

[0028] For AC load port converters and DC load port converters, the output port voltage is stabilized by a voltage outer loop, and the load current is tracked by a current inner loop.

[0029] The principle of the adaptive droop control based on the state of charge is expressed as: dc_ref =U dc +ΔU dc -mP BAT , where U dc_ref is the reference value of DC bus voltage, U dc is the actual value of the DC bus voltage, ΔU dc is an adaptive adjustable value, expressed as: and are the minimum and maximum values ​​of the DC bus voltage, a and b are the lower and upper limits of the state of charge, respectively. BAT is the state of charge of the energy storage, m is the droop coefficient, expressed as: and are the maximum output power and minimum output power of energy storage, P BAT is the output power of the energy storage.

[0030] The technical solution adopted by the present invention to solve the technical problem is: to provide a power coordination control device, comprising:

[0031] An acquisition module is used to obtain the status of the grid-connected port and the interconnected port of the rural area microgrid integrated interface device;

[0032] A first determination module is used to determine the operation mode of the rural area microgrid integrated interface device according to the status of the grid-connected port and the interconnected port;

[0033] A second determination module is used to determine the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device;

[0034] The control module is used to coordinate and control the converters of each port of the rural area microgrid integrated interface device according to the internal power flow of the rural area microgrid integrated interface device.

[0035] The first determining module comprises:

[0036] A first determining unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a distribution-micro interconnection mode when both the grid-connected port and the interconnection port are in an access state;

[0037] A second determination unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a distribution network direct connection mode when the grid-connected port is in an access state and the interconnection port is in an unaccessed state;

[0038] A third determining unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a microgrid interconnection mode when the grid-connected port is in a disconnected state and the interconnection port is in a connected state;

[0039] The fourth determination unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a self-balancing mode when the grid-connected port and the interconnection port are both in an unconnected state.

[0040] The second determination module includes a first power analysis unit. When the operation mode of the rural area microgrid integrated interface device is the distribution micro-interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port. If the net power of the other rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of the other rural area microgrid integrated interface device is greater than If the state of charge of the rural area microgrid integrated interface device is less than the upper limit of the state of charge, the excess electric energy will be transmitted to the grid through the grid-connected port; if the net power of the rural area microgrid integrated interface device is less than zero, the shortfall will be powered by the energy storage; if the state of charge of the energy storage is less than the discharge threshold, the shortfall will be powered by another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the shortfall will be powered by the grid through the grid-connected port.

[0041] The second determination module includes a second power analysis unit. When the operation mode of the rural substation microgrid integrated interface device is the distribution network direct connection mode, if the net power of the rural substation microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is transmitted to the power grid through the grid-connected port or the distributed power generation output is limited; if the net power of the rural substation microgrid integrated interface device is less than zero, the energy storage is used to supply power to the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the power grid is used to supply power to the shortfall through the grid-connected port.

[0042] The second determination module includes a third power analysis unit, which, when the operation mode of the rural area microgrid integrated interface device is the microgrid interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, then the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, then the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is greater than zero, and the other rural area microgrid integrated interface device If the state of charge of the energy storage is greater than the upper limit of the state of charge, the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage is used to supply power to the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the other rural area microgrid integrated interface device is used to supply power to the shortfall through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the loads are cut off in order of importance.

[0043] The second determination module includes a fourth power analysis unit, which is used to input excess electric energy into the energy storage for storage if the net power of the rural area microgrid integrated interface device is greater than zero when the operation mode of the rural area microgrid integrated interface device is the self-balancing mode; if the state of charge of the energy storage is greater than the charging threshold, the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage is used to supply the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the load is cut off in order of importance.

[0044] The control module comprises:

[0045] The grid-connected port converter and the AC generation port converter control unit are used to calculate the actual active power value and reactive power value by using the output voltage and current of the grid-connected port and the AC generation port, respectively participate in the control of the active loop and the reactive loop according to the virtual synchronous motor control, realize active frequency modulation and reactive voltage regulation, and then use the PWM generator to generate pulses to drive the switch tube through the cascade voltage outer loop and the current inner loop to realize the control of the grid-connected port converter and the AC generation port converter;

[0046] A DC power generation port converter control unit, used for controlling the output voltage and current of the DC power generation port by using maximum power point tracking;

[0047] The energy storage port converter control unit is used to achieve DC bus voltage stability through adaptive droop control based on the state of charge, and track the current using the current inner loop;

[0048] The DC charging pile port converter control unit is used to charge the electric vehicle through the power outer loop when the energy storage is working normally, and the current inner loop tracks and controls the current; when the energy storage fails or anomalies occur, constant voltage control is used to stabilize the DC bus voltage;

[0049] The AC load port converter and the DC load port converter control unit are used to stabilize the output port voltage through the voltage outer loop and track the load current through the current inner loop.

[0050] The principle of the adaptive droop control based on the state of charge adopted by the energy storage port converter control unit is expressed as follows: dc_ref =U dc +ΔU dc -mP BAT , where U dc_ref is the reference value of DC bus voltage, U dc is the actual value of the DC bus voltage, ΔU dc is an adaptive adjustable value, expressed as: and are the minimum and maximum values ​​of the DC bus voltage, a and b are the lower and upper limits of the state of charge, respectively. BAT is the state of charge of the energy storage, m is the droop coefficient, expressed as: and are the maximum output power and minimum output power of energy storage, P BAT is the output power of the energy storage.

[0051] The technical solution adopted by the present invention to solve its technical problem is: to provide an electronic device, including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned power coordination control method when executing the computer program.

[0052] The technical solution adopted by the present invention to solve its technical problem is: providing a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned power coordination control method are implemented.

[0053] Beneficial Effects

[0054] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention determines the operation mode of the rural substation microgrid integrated interface device according to the status of the grid-connected port and the interconnected port, and then determines the internal power flow of the rural substation microgrid integrated interface device according to the operation mode, and then coordinates and controls each port by collecting the current and voltage information of each port and combining the internal power flow of the rural substation microgrid integrated interface device, so that when the operation mode changes, the device can quickly balance its own power, reduce the amount of electricity dispatched from the rural distribution station area, realize the energy autonomy of the device, and improve the utilization rate of rural distributed resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a flow chart of a power coordination control method according to a first embodiment of the present invention;

[0056] Figure 2 It is a system architecture diagram of the rural area microgrid integrated interface device in the first embodiment of the present invention;

[0057] Figure 3 It is an internal structure diagram of the rural area microgrid integrated interface device in the first embodiment of the present invention;

[0058] Figure 4 It is a schematic diagram of switching of various operation modes of the rural area microgrid integrated interface device in the first embodiment of the present invention;

[0059] Figure 5 is a schematic diagram of the control strategy of the grid-connected port and the AC power generation port converter in the first embodiment of the present invention;

[0060] Figure 6 is a schematic diagram of a control strategy of a DC power generation port converter in a first embodiment of the present invention;

[0061] Figure 7 is a schematic diagram of a control strategy of an energy storage port converter in a first embodiment of the present invention;

[0062] Figure 8 is a schematic diagram of a control strategy of a DC charging pile port converter in the first embodiment of the present invention;

[0063] Fig. 9 It is a schematic diagram of the control strategy of the AC load port and the DC load port converter in the first embodiment of the present invention. DETAILED DESCRIPTION

[0064] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0065] The first embodiment of the present invention relates to a power coordination control method, which is applied to Figure 3 The rural area microgrid integrated interface device shown in FIG. 1 has a system architecture as shown in FIG. Figure 2 As shown. The rural area microgrid includes photovoltaic power generation, biogas power generation, electric vehicle charging piles and energy storage devices, which are connected to the area transformer through the rural area microgrid integrated interface device. During the day when there is sufficient sunlight and working hours, the output of photovoltaic power generation and biogas power generation is large, part of the electricity is supplied to the local load, and the remaining electricity is stored through the energy storage device or sent to the distribution network. At night or when biogas power generation is insufficient, the energy storage device and the distribution network jointly supply power to the local load.

[0066] like Figure 1 As shown, the power coordination control method of this embodiment specifically includes the following steps:

[0067] Step 1: Obtain the status of the grid-connected port and the interconnected port of the rural area microgrid integrated interface device.

[0068] Step 2: Determine the operation mode of the rural area microgrid integrated interface device according to the status of the grid-connected port and the interconnection port.

[0069] According to the operating characteristics of the rural microgrid, this embodiment divides the operating modes of the rural microgrid integrated interface device into four types according to the status of the grid-connected port and the interconnection port of the rural microgrid integrated interface device, namely, the distribution microgrid interconnection mode, the distribution network direct connection mode, the microgrid interconnection mode and the self-balancing mode. The rural microgrid integrated interface device can switch smoothly in different operating modes. The corresponding relationship between the switching between the operating modes and the port status is as follows: Figure 4 shown.

[0070] This step determines the operation mode of the rural area microgrid integrated interface device according to the status of the grid-connected port and the interconnection port, specifically:

[0071] When both the grid-connected port and the interconnection port are in the access state, it is determined that the operation mode of the rural area microgrid integrated interface device is the distribution micro-interconnection mode. In this mode, the grid-connected port of the rural area microgrid integrated interface device is connected to the 10kV power grid through the area transformer, and the interconnection port is connected to another rural area microgrid integrated interface device. The DC bus voltage is maintained by energy storage inside the rural area microgrid integrated interface device, and the power size and flow direction of each port are controlled by the central controller. At this time, the rural area microgrid integrated interface device can realize two-way transmission of electric energy with the power grid and another rural area microgrid integrated interface device. When the distributed power generation and energy storage output of the rural area microgrid integrated interface device cannot meet the load power supply demand, it is preferentially supplied by another rural area microgrid integrated interface device. If it still cannot meet the demand, the power grid is required to supply power. When the rural area microgrid integrated interface device has excess power, it can be uploaded to the power grid.

[0072] When the grid-connected port is in an accessed state and the interconnection port is in an unconnected state, it is determined that the operation mode of the rural area microgrid integrated interface device is a distribution network direct connection mode. In this mode, the grid-connected port of the rural area microgrid integrated interface device is connected to the 10kV power grid through the area transformer, and the DC interconnection port is not connected to another rural area microgrid integrated interface device. The DC bus voltage is maintained by energy storage inside the device. At this time, the rural area microgrid integrated interface device can realize two-way transmission of electric energy with the power grid. When the distributed power generation and energy storage output of the rural area microgrid integrated interface device cannot meet the load power supply demand, the power grid is used for power supply. When the rural area microgrid integrated interface device has excess power, it can be uploaded to the power grid.

[0073] When the grid-connected port is in an unconnected state and the interconnection port is in an connected state, it is determined that the operation mode of the rural area microgrid integrated interface device is a microgrid interconnection mode. In this mode, the grid-connected port of the rural area microgrid integrated interface device is not connected to the 10kV power grid, and the interconnection port is connected to another rural area microgrid integrated interface device. The DC bus voltage is maintained by energy storage inside the rural area microgrid integrated interface device. At this time, the rural area microgrid integrated interface device can realize two-way transmission of electric energy with another rural area microgrid integrated interface device. When the distributed power generation and energy storage output of the rural area microgrid integrated interface device cannot meet the load power supply demand, another rural area microgrid integrated interface device will supply power to it. If it still cannot meet the demand, the loads need to be cut off in order of importance.

[0074] When both the grid-connected port and the interconnection port are in the disconnected state, the operation mode of the rural area microgrid integrated interface device is determined to be the self-balancing mode. In this mode, the grid-connected port of the rural area microgrid integrated interface device is not connected to the 10kV grid, and the interconnection port is not connected to another rural area microgrid integrated interface device. The DC bus voltage is maintained by a battery inside the rural area microgrid integrated interface device, and the rural area microgrid integrated interface device supplies power to the AC and DC loads through energy storage.

[0075] Step 3: Determine the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device.

[0076] After determining the operation mode of the rural area microgrid integrated interface device, the internal power flow of the rural area microgrid integrated interface device can be analyzed according to the net power of the rural area microgrid integrated interface device.

[0077] Among them, the net power of the rural area microgrid integrated interface device can be obtained by the following methods: first, according to the photovoltaic output P PV and biogas output P BPG Determine the distributed generation output P DG , that is, P DG =P PV +P BPG Then according to the AC load P AC_Ld 、DC load P DC_Ld and the electric vehicle charging power P EV Calculate load power P Ld , that is, P Ld =P AC_Ld +P DC_Ld +P EV The net power ΔP of the integrated interface device of the rural microgrid is the distributed generation output P DG With load power P Ld The difference, that is, ΔP = P DG -P Ld .

[0078] When analyzing the internal power flow of the integrated interface device of the rural microgrid, the details are as follows:

[0079] (1) Micro-interconnection model

[0080] like Figure 2 As shown in the figure, when the net power ΔP1 of the rural microgrid integrated interface device of area 1 is greater than 0, the excess electric energy is input to the energy storage for storage, and the output power P of the energy storage is BAT1=-ΔP1. If the state of charge (SOC) of the energy storage is greater than the charging threshold, the excess power is transmitted to the rural area microgrid integrated interface device of area 2, and the energy storage in area 2 absorbs the excess power. At this time, the interconnection port power P of the rural area microgrid integrated interface device of area 1 is I1 =-ΔP1, the interconnection port power P of the rural microgrid integrated interface device in area 2 I2 =ΔP1, the output power P of the energy storage of the rural microgrid integrated interface device of station area 2 BAT2 =-(ΔP2+P I2 ). If the rural area microgrid integrated interface device of area 2 is in a power surplus state at this time, that is, the net power of the rural area microgrid integrated interface device of area 2 is greater than 0 and the state of charge of the energy storage of the rural area microgrid integrated interface device of area 2 is greater than the upper limit value b of the state of charge, then the excess electric energy will be transmitted to the grid, and the grid output P G =-ΔP1.

[0081] When the net power ΔP1 of the rural microgrid integrated interface device in area 1 is less than 0, the power shortage is provided by the energy storage, and the output power P BAT1 =ΔP1. If the SOC of the energy storage is less than the discharge threshold, the rural area microgrid integrated interface device of area 2 will supply power to the shortfall. At this time, the interconnection port power P of the rural area microgrid integrated interface device of area 1 is I1 =ΔP1, the interconnection port power P of the rural microgrid integrated interface device in area 2 I2 =-ΔP1, the output power P of the energy storage of the rural microgrid integrated interface device of station area 2 BAT2 =-(ΔP2+P I2 ). If the rural area microgrid integrated interface device of area 2 is in a power shortage state at this time, that is, the net power of the rural area microgrid integrated interface device of area 2 is less than 0 and the state of charge of the energy storage of the rural area microgrid integrated interface device of area 2 is less than the lower limit value a of the state of charge, then the connected power grid will supply power to the shortage part, and the power grid output P G =ΔP1.

[0082] (2) Distribution network direct connection mode:

[0083] like Figure 2 As shown in the figure, when the net power ΔP1 of the rural microgrid integrated interface device of area 1 is greater than 0, the excess electric energy is input to the energy storage for storage, and the output power P of the energy storage is BAT1 =-ΔP1. If the state of charge (SOC) of the energy storage is greater than the charging threshold, the excess energy will be transmitted to the grid, and the grid output P G =-ΔP1, or limit the output of distributed generation.

[0084] When the net power ΔP1 of the rural microgrid integrated interface device in area 1 is less than 0, the power shortage is provided by the energy storage, and the output power P BAT1 =ΔP1. If the SOC of the energy storage is less than the discharge threshold, the shortfall will be supplied, and the grid output P G =ΔP1.

[0085] (3) Microgrid interconnection mode

[0086] like Figure 2 As shown in the figure, when the net power ΔP1 of the rural microgrid integrated interface device of area 1 is greater than 0, the excess electric energy is input to the energy storage for storage, and the output power P of the energy storage is BAT1 =-ΔP1. If the state of charge (SOC) of the energy storage is greater than the charging threshold, the excess power is transmitted to the rural area microgrid integrated interface device of area 2, and the energy storage of the rural area microgrid integrated interface device of area 1 absorbs the excess power. At this time, the interconnection port power P of the rural area microgrid integrated interface device of area 1 is I1 =-ΔP1, the interconnection port power P of the rural microgrid integrated interface device in area 2 I2 =-ΔP1, the output power P of the energy storage of the rural microgrid integrated interface device of station area 2 BAT2 =-(ΔP2+P I2 ). If at this time the rural area microgrid integrated interface device of area 2 is in a power surplus state, that is, the net power of the rural area microgrid integrated interface device of area 2 is greater than 0 and the state of charge of the energy storage of the rural area microgrid integrated interface device of area 2 is greater than the upper limit value b of the state of charge, the distributed generation output is limited.

[0087] When the net power ΔP1 of the rural microgrid integrated interface device in area 1 is less than 0, the power shortage is provided by the energy storage, and the output power P BAT1 =ΔP1. If the SOC of the energy storage is less than the discharge threshold, the rural area microgrid integrated interface device of area 2 will supply power to the shortfall. At this time, the interconnection port power P of the rural area microgrid integrated interface device of area 1 is I1 =ΔP1, the interconnection port power P of the rural microgrid integrated interface device in area 2 I2 =-ΔP1, the output power P of the energy storage of the rural microgrid integrated interface device of station area 2 BAT2 =-(ΔP2+P I2). If the rural area microgrid integrated interface device of area 2 is in a power shortage state at this time, that is, the net power of the rural area microgrid integrated interface device of area 2 is less than 0 and the state of charge of the energy storage of the rural area microgrid integrated interface device of area 2 is less than the lower limit of the state of charge a, then the loads are cut off in order of importance.

[0088] (4) Self-balancing mode:

[0089] like Figure 2 As shown in the figure, when the net power ΔP1 of the rural microgrid integrated interface device of area 1 is greater than 0, the excess electric energy is input to the energy storage for storage, and the output power P of the energy storage is BAT1 =-ΔP1. If the state of charge (SOC) of the energy storage is greater than the charging threshold, the output of distributed generation is limited.

[0090] When the net power ΔP1 of the rural microgrid integrated interface device in area 1 is less than 0, the power shortage is provided by the energy storage, and the output power P BAT1 =ΔP1. If the SOC of the energy storage is less than the discharge threshold, the loads are removed in order of importance.

[0091] Step 4: coordinately control the converters of each port of the rural area microgrid integrated interface device according to the internal power flow of the rural area microgrid integrated interface device.

[0092] To achieve stable operation of the integrated interface device of the rural microgrid, it is necessary to coordinate and control the converters at each port. The details are as follows:

[0093] like Figure 5 As shown, for the grid-connected port converter and the AC generation port converter, firstly, the output voltage and current of the grid-connected port and the AC generation port are used to calculate the actual active power value and reactive power value, and according to the virtual synchronous motor control, they participate in the control of the active loop and the reactive loop respectively to realize active frequency modulation and reactive voltage regulation, and then the control accuracy is improved by cascading the voltage outer loop and the current inner loop, and finally the PWM generator is used to generate pulses to drive the switch tube to realize the control of the grid-connected port converter and the AC generation port converter, and realize the seamless switching of the device on-grid and off-grid control.

[0094] like Figure 6 As shown, for the DC power generation port converter, the output voltage and current of the DC power generation port are controlled by maximum power point tracking.

[0095] like Figure 7 As shown, for the energy storage port converter, the DC bus voltage is stabilized by the adaptive droop control based on the state of charge, and the current is tracked and controlled by the current inner loop. The principle of the adaptive droop control based on the state of charge is expressed as:

[0096] U dc_ref =U dc +ΔU dc -mP BAT ;

[0097] Among them, U dc_ref is the reference value of DC bus voltage, U dc is the actual value of the DC bus voltage, ΔU dc is an adaptive adjustable value, expressed as: and are the minimum and maximum values ​​of the DC bus voltage, a and b are the lower and upper limits of the state of charge, respectively. BAT is the state of charge of the energy storage, m is the droop coefficient, expressed as: and are the maximum output power and minimum output power of energy storage, P BAT is the output power of the energy storage.

[0098] like Figure 8 As shown, for the DC charging pile port converter, when the energy storage is working normally, the power outer loop charges the electric vehicle, and the current inner loop tracks and controls the current; when the energy storage fails or an abnormality occurs, constant voltage control is used to stabilize the DC bus voltage.

[0099] like Fig. 9 As shown, for the AC load port converter and the DC load port converter, the output port voltage is stabilized by the voltage outer loop, and the load current is tracked by the current inner loop.

[0100] It is not difficult to find that the present invention determines the operating mode of the rural substation microgrid integrated interface device according to the status of the grid-connected port and the interconnected port, and then determines the internal power flow of the rural substation microgrid integrated interface device according to the operating mode. After that, by collecting the current and voltage information of each port and combining the internal power flow of the rural substation microgrid integrated interface device, each port is coordinated and controlled, so that when the operating mode changes, the device can quickly balance its own power, reduce the amount of electricity dispatched from the rural distribution station area, realize the energy autonomy of the device, and improve the utilization rate of rural distributed resources.

[0101] A second embodiment of the present invention relates to a power coordination control device, comprising:

[0102] An acquisition module is used to obtain the status of the grid-connected port and the interconnected port of the rural area microgrid integrated interface device;

[0103] A first determination module is used to determine the operation mode of the rural area microgrid integrated interface device according to the status of the grid-connected port and the interconnected port;

[0104] A second determination module is used to determine the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device;

[0105] The control module is used to coordinate and control the converters of each port of the rural area microgrid integrated interface device according to the internal power flow of the rural area microgrid integrated interface device.

[0106] The first determining module comprises:

[0107] A first determining unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a distribution-micro interconnection mode when both the grid-connected port and the interconnection port are in an access state;

[0108] A second determination unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a distribution network direct connection mode when the grid-connected port is in an access state and the interconnection port is in an unaccessed state;

[0109] A third determining unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a microgrid interconnection mode when the grid-connected port is in a disconnected state and the interconnection port is in a connected state;

[0110] The fourth determination unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a self-balancing mode when the grid-connected port and the interconnection port are both in an unconnected state.

[0111] The second determination module includes a first power analysis unit. When the operation mode of the rural area microgrid integrated interface device is the distribution micro-interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port. If the net power of the other rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of the other rural area microgrid integrated interface device is greater than If the state of charge of the rural area microgrid integrated interface device is less than the upper limit of the state of charge, the excess electric energy will be transmitted to the grid through the grid-connected port; if the net power of the rural area microgrid integrated interface device is less than zero, the shortfall will be powered by the energy storage; if the state of charge of the energy storage is less than the discharge threshold, the shortfall will be powered by another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the shortfall will be powered by the grid through the grid-connected port.

[0112] The second determination module includes a second power analysis unit. When the operation mode of the rural substation microgrid integrated interface device is the distribution network direct connection mode, if the net power of the rural substation microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is transmitted to the power grid through the grid-connected port or the distributed power generation output is limited; if the net power of the rural substation microgrid integrated interface device is less than zero, the energy storage is used to supply power to the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the power grid is used to supply power to the shortfall through the grid-connected port.

[0113] The second determination module includes a third power analysis unit, which, when the operation mode of the rural area microgrid integrated interface device is the microgrid interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, then the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, then the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is greater than zero, and the other rural area microgrid integrated interface device If the state of charge of the energy storage is greater than the upper limit of the state of charge, the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage is used to supply power to the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the other rural area microgrid integrated interface device is used to supply power to the shortfall through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the loads are cut off in order of importance.

[0114] The second determination module includes a fourth power analysis unit, which is used to input excess electric energy into the energy storage for storage if the net power of the rural area microgrid integrated interface device is greater than zero when the operation mode of the rural area microgrid integrated interface device is the self-balancing mode; if the state of charge of the energy storage is greater than the charging threshold, the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage is used to supply the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the load is cut off in order of importance.

[0115] The control module comprises:

[0116] The grid-connected port converter and the AC generation port converter control unit are used to calculate the actual active power value and reactive power value by using the output voltage and current of the grid-connected port and the AC generation port, respectively participate in the control of the active loop and the reactive loop according to the virtual synchronous motor control, realize active frequency modulation and reactive voltage regulation, and then use the PWM generator to generate pulses to drive the switch tube through the cascade voltage outer loop and the current inner loop to realize the control of the grid-connected port converter and the AC generation port converter;

[0117] A DC power generation port converter control unit, used for controlling the output voltage and current of the DC power generation port by using maximum power point tracking;

[0118] The energy storage port converter control unit is used to achieve DC bus voltage stability through adaptive droop control based on the state of charge, and track the current using the current inner loop;

[0119] The DC charging pile port converter control unit is used to charge the electric vehicle through the power outer loop when the energy storage is working normally, and the current inner loop tracks and controls the current; when the energy storage fails or anomalies occur, constant voltage control is used to stabilize the DC bus voltage;

[0120] The AC load port converter and the DC load port converter control unit are used to stabilize the output port voltage through the voltage outer loop and track the load current through the current inner loop.

[0121] The principle of the adaptive droop control based on the state of charge adopted by the energy storage port converter control unit is expressed as follows: dc_ref =U dc +ΔU dc -mP BAT , where U dc_ref is the reference value of DC bus voltage, U dc is the actual value of the DC bus voltage, ΔU dc is an adaptive adjustable value, expressed as: and are the minimum and maximum values ​​of the DC bus voltage, a and b are the lower and upper limits of the state of charge, respectively. BAT is the state of charge of the energy storage, m is the droop coefficient, expressed as: and are the maximum output power and minimum output power of energy storage, P BAT is the output power of the energy storage.

[0122] A third embodiment of the present invention relates to an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the power coordination control method of the first embodiment when executing the computer program.

[0123] A fourth embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the power coordination control method of the first embodiment are implemented.

[0124] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0125] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0126] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction method, which is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0127] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0128] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A power coordination control method, characterized in that: The following steps are involved: Obtain the status of the grid-connected port and interconnected port of the rural microgrid integrated interface device; Determine the operation mode of the rural area microgrid integrated interface device according to the status of the grid-connected port and the interconnection port; Determine the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device; The converters of each port of the rural area microgrid integrated interface device are coordinated and controlled according to the internal power flow conditions of the rural area microgrid integrated interface device.

2. The power coordination control method according to claim 1, characterized in that: Determining the operation mode of the rural area microgrid integrated interface device according to the states of the grid-connected port and the interconnected port specifically includes: When the grid-connected port and the interconnection port are both in the connected state, determining that the operation mode of the rural area microgrid integrated interface device is the distribution-micro interconnection mode; When the grid-connected port is in an access state and the interconnection port is in an unaccessed state, determining that the operation mode of the rural area microgrid integrated interface device is a distribution network direct connection mode; When the grid-connected port is in an unconnected state and the interconnection port is in an connected state, determining that the operation mode of the rural area microgrid integrated interface device is a microgrid interconnection mode; When the grid-connected port and the interconnection port are both in an unconnected state, it is determined that the operation mode of the rural area microgrid integrated interface device is a self-balancing mode.

3. The power coordination control method according to claim 1, characterized in that: The determining of the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device specifically includes: When the operation mode of the rural area microgrid integrated interface device is the distribution micro-interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is greater than the upper limit of the state of charge, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; It is transmitted to the power grid through the grid-connected port; if the net power of the rural area microgrid integrated interface device is less than zero, the shortfall is powered by the energy storage; if the state of charge of the energy storage is less than the discharge threshold, the shortfall is powered by another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the shortfall is powered by the power grid through the grid-connected port.

4. The power coordination control method according to claim 1, characterized in that: The method further comprises: determining the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device; When the operation mode of the rural area microgrid integrated interface device is the distribution network direct connection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the charge state of the energy storage is greater than the charging threshold, the excess electric energy is transmitted to the power grid through the grid-connected port or the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage is used to supply the shortfall; if the charge state of the energy storage is less than the discharge threshold, the power grid is used to supply the shortfall through the grid-connected port.

5. The power coordination control method according to claim 1, characterized in that: The method further comprises: determining the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device; When the operation mode of the rural area microgrid integrated interface device is the microgrid interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is greater than the upper limit of the state of charge, the output of distributed power generation is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage supplies power to the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the other rural area microgrid integrated interface device supplies power to the shortfall through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the load is cut off in order of importance.

6. The power coordination control method according to claim 1, characterized in that: The method further comprises: determining the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device; When the operation mode of the rural area microgrid integrated interface device is the self-balancing mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the charge state of the energy storage is greater than the charging threshold, the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage will supply the shortfall; if the charge state of the energy storage is less than the discharge threshold, the load will be cut off in order of importance.

7. The power coordination control method according to claim 1, characterized in that: The coordinated control of the converters of each port of the rural area microgrid integrated interface device according to the internal power flow of the rural area microgrid integrated interface device specifically includes: For the grid-connected port converter and the AC generation port converter, the actual active power value and reactive power value are calculated using the output voltage and current of the grid-connected port and the AC generation port, and the active loop and reactive loop are controlled according to the virtual synchronous motor control to realize active frequency modulation and reactive voltage regulation. Then, the cascade voltage outer loop and current inner loop are used to generate pulses to drive the switch tube, thereby realizing the control of the grid-connected port converter and the AC generation port converter; For the DC power generation port converter, the output voltage and current of the DC power generation port are controlled by maximum power point tracking; For the energy storage port converter, the DC bus voltage is stabilized by adaptive droop control based on the state of charge. The current inner loop is used to track and control the current; For the DC charging pile port converter, when the energy storage is working normally, the power outer loop charges the electric vehicle, and the current inner loop tracks and controls the current; when the energy storage fails or an abnormality occurs, constant voltage control is used to stabilize the DC bus voltage; For AC load port converters and DC load port converters, the output port voltage is stabilized by a voltage outer loop, and the load current is tracked by a current inner loop.

8. The power coordination control method according to claim 7, characterized in that: The principle of the adaptive droop control based on the state of charge is expressed as: dc_ref =U dc +ΔU dc -mP BAT , where U dc_ref is the reference value of DC bus voltage, U dc is the actual value of the DC bus voltage, ΔU dc is an adaptive adjustable value, expressed as: and are the minimum and maximum values ​​of the DC bus voltage, a and b are the lower and upper limits of the state of charge, respectively. BAT is the state of charge of the energy storage, m is the droop coefficient, expressed as: and are the maximum output power and minimum output power of energy storage, P BAT is the output power of the energy storage.

9. A power coordination control device, characterized in that: include: An acquisition module is used to obtain the status of the grid-connected port and the interconnected port of the rural area microgrid integrated interface device; A first determination module is used to determine the operation mode of the rural area microgrid integrated interface device according to the status of the grid-connected port and the interconnected port; The second determination module is used to determine the internal power flow of the rural area microgrid integrated interface device according to the net power of the rural area microgrid integrated interface device and the operation mode of the rural area microgrid integrated interface device; The control module is used to coordinate and control the converters of each port of the rural area microgrid integrated interface device according to the internal power flow of the rural area microgrid integrated interface device.

10. The power coordination control device according to claim 9, characterized in that: The first determining module comprises: A first determining unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a distribution-micro interconnection mode when both the grid-connected port and the interconnection port are in an access state; A second determining unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a distribution network direct connection mode when the grid-connected port is in an access state and the interconnection port is in an unaccessed state; A third determining unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a microgrid interconnection mode when the grid-connected port is in a disconnected state and the interconnection port is in a connected state; The fourth determination unit is used to determine that the operation mode of the rural area microgrid integrated interface device is a self-balancing mode when the grid-connected port and the interconnection port are both in an unconnected state.

11. The power coordination control device according to claim 9, characterized in that: The second determination module includes a first power analysis unit. When the operation mode of the rural area microgrid integrated interface device is the distribution micro-interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port. If the net power of the other rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of the other rural area microgrid integrated interface device is greater than If the state of charge of the rural area microgrid integrated interface device is less than the upper limit of the state of charge, the excess electric energy will be transmitted to the grid through the grid-connected port; if the net power of the rural area microgrid integrated interface device is less than zero, the shortfall will be powered by the energy storage; if the state of charge of the energy storage is less than the discharge threshold, the shortfall will be powered by another rural area microgrid integrated interface device through the interconnection port; if the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the shortfall will be powered by the grid through the grid-connected port.

12. The power coordination control device according to claim 9, characterized in that: The second determination module includes a second power analysis unit, which, when the operation mode of the rural area microgrid integrated interface device is the distribution network direct connection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, then the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, then the excess electric energy is transmitted to the grid through the grid-connected port or the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, then the energy storage supplies power to the shortfall; If the state of charge of the energy storage is less than the discharge threshold, the grid supplies power to the shortfall through the grid-connected port.

13. The power coordination control device according to claim 9, characterized in that: The second determination module includes a third power analysis unit, and when the operation mode of the rural area microgrid integrated interface device is the microgrid interconnection mode, if the net power of the rural area microgrid integrated interface device is greater than zero, the excess electric energy is input into the energy storage for storage; if the state of charge of the energy storage is greater than the charging threshold, the excess electric energy is input into another rural area microgrid integrated interface device through the interconnection port; If the net power of another rural area microgrid integrated interface device is greater than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is greater than the upper limit of the state of charge, the distributed power generation output is limited; if the net power of the rural area microgrid integrated interface device is less than zero, the energy storage is used to supply power to the shortfall; if the state of charge of the energy storage is less than the discharge threshold, the other rural area microgrid integrated interface device is used to supply power to the shortfall through the interconnection port; If the net power of another rural area microgrid integrated interface device is less than zero, and the state of charge of the energy storage of another rural area microgrid integrated interface device is less than the lower limit of the state of charge, the loads are cut off in order of importance.

14. The power coordination control device according to claim 9, characterized in that: The second determination module includes a fourth power analysis unit, and the fourth power analysis unit is used to input excess electric energy into energy storage for storage when the operation mode of the rural area microgrid integrated interface device is a self-balancing mode and if the net power of the rural area microgrid integrated interface device is greater than zero; If the state of charge of the energy storage is greater than the charging threshold, the distributed power generation output is limited; if the net power of the rural microgrid integrated interface device is less than zero, the energy storage will supply the shortfall; if the state of charge of the energy storage is less than the discharging threshold, the load will be cut off in order of importance.

15. The power coordination control device according to claim 9, characterized in that: The control module comprises: The grid-connected port converter and the AC generation port converter control unit are used to calculate the actual active power value and reactive power value by using the output voltage and current of the grid-connected port and the AC generation port, respectively participate in the control of the active loop and the reactive loop according to the virtual synchronous motor control, realize active frequency modulation and reactive voltage regulation, and then use the PWM generator to generate pulses to drive the switch tube through the cascade voltage outer loop and the current inner loop to realize the control of the grid-connected port converter and the AC generation port converter; A DC power generation port converter control unit, used for controlling the output voltage and current of the DC power generation port by using maximum power point tracking; The energy storage port converter control unit is used to achieve DC bus voltage stability through adaptive droop control based on the state of charge, and track the current using the current inner loop; The DC charging pile port converter control unit is used to charge the electric vehicle through the power outer loop when the energy storage is working normally, and the current inner loop tracks and controls the current; when the energy storage fails or anomalies occur, constant voltage control is used to stabilize the DC bus voltage; The AC load port converter and the DC load port converter control unit are used to stabilize the output port voltage through the voltage outer loop and track the load current through the current inner loop.

16. The power coordination control device according to claim 15, characterized in that: The principle of the adaptive droop control based on the state of charge adopted by the energy storage port converter control unit is expressed as follows: dc_ref =U dc +ΔU dc -mP BAT , where U dc_ref is the reference value of DC bus voltage, U dc is the actual value of the DC bus voltage, ΔU dc is an adaptive adjustable value, expressed as: and are the minimum and maximum values ​​of the DC bus voltage, a and b are the lower and upper limits of the state of charge, respectively. BAT is the state of charge of the energy storage, m is the droop coefficient, expressed as: and are the maximum output power and minimum output power of energy storage, P BAT is the output power of the energy storage.

17. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the power coordination control method as described in any one of claims 1-8 are implemented.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the power coordination control method according to any one of claims 1 to 8 are implemented.

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