Microgrid non-communication load segmented power supply recovery method and system, medium and product

Abstract

The invention discloses a micro-grid non-communication load segmented power supply recovery method and system, a medium and a product, and the method comprises the steps: after a micro-grid formed by a segmented power supply system dominated by an energy storage converter is powered off, restarting a network-forming type energy storage converter; according to the output apparent power of the network construction type energy storage converter, an output voltage instruction of the network construction type energy storage converter is adjusted; after the network construction type energy storage converter is restarted, the intelligent switch of each segment of the segmented power supply system detects the energy storage terminal voltage, when the energy storage terminal voltage is higher than the closing voltage and the closing time is maintained, the intelligent switch is closed to recover the power supply of the next segment of load, otherwise, the intelligent switch does not act; the closing voltage meets a preset constraint condition. According to the method, load segmented power supply recovery can be rapidly achieved after power failure without communication, load loss is reduced, and the power supply reliability of the micro-grid is improved.

Description

Technical Field

[0001] This invention relates to the field of microgrid power restoration technology, specifically to a method, system, medium, and product for segmented power restoration of microgrids without communication loads. Background Technology

[0002] Currently, distributed renewable energy has been integrated into the distribution network on a large scale. Due to the volatility and intermittency of distributed renewable energy output, power mismatch with local loads can cause problems such as high and low voltage exceeding limits and heavy overload of distribution transformers in both directions. To address this, configuring distribution area-side energy storage with a certain capacity can effectively smooth out the output fluctuations of distributed renewable energy, improve the absorption capacity of distributed renewable energy in distribution areas, and solve the aforementioned power supply problems. Furthermore, energy storage is widely used in microgrids to achieve power balance and emergency power supply. When natural disasters cause line faults, distribution area-side energy storage under grid control still has the potential to provide frequency and voltage support, supporting the restoration of loads and the normal operation of distributed renewable energy within a certain range. Due to the capacity limitations of energy storage converters, the operational recovery area needs to be determined based on the fault location and the distribution of "source and load" to avoid overload and burnout of the energy storage converter. However, current research on using distributed resources and distribution area-side energy storage for power supply under fault conditions adopts centralized control, requiring additional control terminals and stable communication to control the load switches in the divided power supply areas. On the one hand, the communication links of the control terminals required for this type of centralized control introduce additional costs; on the other hand, the centralized control method cannot be implemented when external factors disrupt the communication links. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method, system, medium and product for segmented power supply restoration of microgrid loads without communication, in response to the above-mentioned problems of the prior art. The present invention aims to realize the rapid segmented power supply restoration of loads after a power outage without communication, reduce load loss and improve the power supply reliability of microgrids.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for restoring segmented power supply to a microgrid without communication loads includes restarting the grid-type energy storage converter after a power outage in a microgrid consisting of a segmented power supply system dominated by an energy storage converter, and adjusting the apparent power output of the grid-type energy storage converter based on the power loss of the grid-type energy storage converter. The system sends commands to adjust the output voltage of the grid-type energy storage converter; after the grid-type energy storage converter restarts, the intelligent switches of each segment of the segmented power supply system detect the voltage at the energy storage terminal. When the energy storage terminal voltage is satisfied Higher than the closing voltage And maintain the closing time The intelligent switch will restore power to the subsequent load segment when it closes; otherwise, it will not operate; closing voltage satisfy: ; in, This is the reference output voltage for the grid-type energy storage converter. This is the heavy load voltage droop factor. For constant parameters less than 1, less than 1 and greater than constant parameters, This refers to the rated power of the grid-type energy storage converter.

[0005] Optionally, the segmented power supply system dominated by the energy storage converter includes an energy storage battery, a grid-type energy storage converter, an AC line, and smart switches. The energy storage battery is connected to the DC side of the grid-type energy storage converter to provide active power and absorb reactive power for the microgrid. The AC side of the grid-type energy storage converter is connected to the AC line, which is a single-chain network topology. The smart switches of each segment are connected in series on the main line of the AC line, dividing the loads and distributed power sources connected to the main line into multiple groups. The energy storage terminal voltage... V bat This refers to the voltage detected by the intelligent switch near the grid-type energy storage converter.

[0006] Optionally, the apparent power output of the grid-type energy storage converter... The commands for adjusting the output voltage of the grid-connected energy storage converter include: when the apparent power output of the grid-connected energy storage converter... Less than or equal to At that time, the output voltage command for adjusting the grid-type energy storage converter is: ; in, This refers to the output voltage command of the grid-connected energy storage converter; when the output apparent power of the grid-connected energy storage converter... Greater than and less than At that time, the output voltage command for adjusting the grid-type energy storage converter is: ; When the apparent power output of the grid-type energy storage converter is greater than and less than At that time, the output voltage command for adjusting the grid-type energy storage converter is: ; in, For grid-type energy storage converters, the long-term overload factor is a value greater than 1. This is the overload voltage droop factor; when the apparent output power of the grid-connected energy storage converter is greater than... And duration If the grid-type energy storage converter activates overload protection and shuts down, the preset maximum recovery time will be used. T t After the secondary circuit shut down due to overload protection, the locked grid-type energy storage converter restarted.

[0007] Optionally, it also includes a smart switch that has already been automatically closed, when the energy storage terminal voltage is detected. Below the trip voltage And maintain the tripping time When the intelligent switch is activated, it disconnects and blocks reclosing, reducing the tripping voltage. satisfy:

[0008] in, For grid-type energy storage converters, the long-term overload factor is a value greater than 1. This is the overload voltage droop factor.

[0009] Optionally, it also includes a smart switch that has already been automatically closed, when the energy storage terminal voltage is detected. Below the fast trip voltage And maintain rapid tripping time When the intelligent switch is activated, it disconnects and blocks reclosing, with the fast trip voltage... Less than the tripping voltage Preset maintenance fast tripping time Less than the tripping time Fast trip voltage satisfy:

[0010] in, This is the overload voltage droop factor.

[0011] Optionally, in the segmented power supply system dominated by the energy storage converter, the opening time of each smart switch... The tripping time corresponds to the smart switch whose distance from the smart switch to the off-grid energy storage converter decreases sequentially from closest to farthest, and the smart switch with the longest distance to the off-grid energy storage converter is... It is greater than the grid connection startup time of the distributed power sources in each segment of the segmented power supply system.

[0012] Optionally, it also includes the closing voltage for the smart switch. , tripping voltage and fast trip voltage Part or all of the voltage drop compensation caused by active and reactive power transmission over long lines is performed. This voltage drop compensation is achieved by adding the voltage drop caused by active and reactive power transmission over long lines to the original voltage. The voltage drop The calculation steps include: S101, Obtain the line impedance of the main line in the segmented power supply system. Energy storage output voltage The initial line apparent power To estimate the load power of the back end of the smart switch Initialize the intelligent switching voltage in the initial stage. Energy storage output voltage The loop variable k is 1; where, For line resistance, For line reactance, The imaginary unit; Active power Reactive power; S102, calculate the line load current of stage k-1 and the intelligent switching voltage of this stage according to the following formula: , ; in, This represents the line load current in stage k-1. express The conjugate of complex numbers, The intelligent switching voltage for stage k-1; The apparent power of the line in stage k-1, This refers to the intelligent switching voltage at this stage. For energy storage output voltage, Given the line impedance of the main line in a segmented power supply system; calculate the line voltage drop in stage k-1 using the following formula. and power loss on the line : , ; S103, calculate the apparent power of the line in stage k according to the following formula. : ; in, The apparent power of the line in stage k; S104, Determine the intelligent switching voltage of stage k. Intelligent switching voltage in the k-1 stage The absolute value of the difference between them, if the absolute value is greater than or equal to a preset threshold. If the loop variable k is incremented by 1, the process jumps to step S102; otherwise, the pressure drop is calculated according to the following formula. And output:

[0013] in, for The absolute value, for The absolute value of.

[0014] The present invention also provides a microgrid segmented power restoration system for non-communication loads, comprising a microprocessor and a memory interconnected thereto, wherein the microprocessor is programmed or configured to execute the microgrid segmented power restoration method for non-communication loads.

[0015] The present invention also provides a computer-readable storage medium storing a computer program or instructions that are programmed or configured to execute the microgrid segmented power supply restoration method for non-communication loads via a processor.

[0016] The present invention also provides a computer program product, including a computer program or instructions, which are programmed or configured to execute the microgrid no-communication load segmented power supply restoration method via a processor.

[0017] Compared with existing technologies, the present invention mainly achieves the following beneficial effects: The microgrid segmented power supply restoration method without communication load in the present invention includes restarting the grid-type energy storage converter, based on the apparent output power of the grid-type energy storage converter. The system sends commands to adjust the output voltage of the grid-type energy storage converter; after the grid-type energy storage converter restarts, the intelligent switches of each segment of the segmented power supply system detect the voltage at the energy storage terminal. When the energy storage terminal voltage is satisfied Higher than the closing voltage And maintain the closing time The intelligent switch will restore power to the subsequent load segment when it closes; otherwise, it will not operate. By coordinating the "power-voltage" curve in the energy storage with the pre-set trigger events in the intelligent switch, it can quickly restore power to the load segment after a power outage without communication, reducing load loss and improving power supply reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the basic process of the method in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a segmented power supply system dominated by an energy storage converter in an embodiment of the present invention.

[0020] Figure 3 This is a graph showing the output power of the energy storage converter in an embodiment of the present invention.

[0021] Figure 4 This is a graph showing the output voltage of the grid-type energy storage converter in an embodiment of the present invention.

[0022] Figure 5 This is a graph of the load-side voltage of the smart switch #1 in this embodiment of the invention.

[0023] Figure 6 This is a graph showing the load-side voltage of the smart switch #2 in this embodiment of the invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] like Figure 1 As shown, the microgrid power restoration method for segmented power supply without communication load in this embodiment includes restarting the grid-type energy storage converter after a power outage in a microgrid consisting of a segmented power supply system dominated by an energy storage converter, based on the apparent power output of the grid-type energy storage converter. The system sends commands to adjust the output voltage of the grid-type energy storage converter; after the grid-type energy storage converter restarts, the intelligent switches of each segment of the segmented power supply system detect the voltage at the energy storage terminal. When the energy storage terminal voltage is satisfied Higher than the closing voltage And maintain the closing time The intelligent switch will restore power to the subsequent load segment when it closes; otherwise, it will not operate; closing voltage satisfy: ; in, This is the reference output voltage for the grid-type energy storage converter. This is the heavy load voltage droop factor. For constant parameters less than 1, less than 1 and greater than constant parameters, This refers to the rated power of the grid-type energy storage converter.

[0026] like Figure 2 As shown, the segmented power supply system dominated by the energy storage converter in this embodiment includes energy storage batteries (such as...). Figure 2 As shown in Figure a), grid-type energy storage converters (such as...) Figure 2 As shown in b), AC lines (such as...) Figure 2 (as shown in c) and smart switches (such as Figure 2 As shown in Figure d), the energy storage battery is connected to the DC side of the grid-type energy storage converter to provide active power and absorb reactive power for the microgrid. The AC side of the grid-type energy storage converter is connected to an AC line, which is a single-chain network topology. The smart switches of each segment are connected in series on the main line of the AC line, dividing the loads and distributed power sources connected to the main line into multiple groups (e.g., ...). Figure 2 (E is a group of loads and distributed power sources), the voltage of the energy storage terminal is shown in Figure e. V bat This refers to the voltage detected by the smart switch near the grid-type energy storage converter. The energy storage battery provides active power support to the system, including providing the active power required by the load and absorbing active power generated by distributed renewable energy sources. The grid-type energy storage converter connects to the energy storage battery output at one end and to an AC line at the other, converting the DC power output from the energy storage battery into AC power. The AC line is a single-chain network topology, connecting the grid-type energy storage converter to distributed power sources and loads within the area. The smart switch is connected in series on the main AC line, dividing the load and distributed renewable energy sources into several areas. In a single system, no more than three smart switches should be used. In this embodiment, the end closer to the grid-type energy storage converter is defined as the energy storage end, and the end farther from the grid-type energy storage converter is defined as the load end. After a system power outage, all smart switches detect no voltage and automatically disconnect.

[0027] In this embodiment, based on the apparent output power of the grid-type energy storage converter... The commands for adjusting the output voltage of the grid-connected energy storage converter include: when the apparent power output of the grid-connected energy storage converter... Less than or equal to At that time, the output voltage command for adjusting the grid-type energy storage converter is: ; in, This refers to the output voltage command of the grid-connected energy storage converter; when the output apparent power of the grid-connected energy storage converter... Greater than and less than When this situation is defined as overload, k 1< k 2<1, adding an additional "power-voltage droop" curve to the original voltage droop control curve, that is: the command to adjust the output voltage of the grid-type energy storage converter is: ; When the apparent power output of the grid-type energy storage converter is greater than and less than When this situation is defined as a severe overload, k 3 represents the long-term overload multiple of the grid-type energy storage converter. k 2<1< k 3. The command to adjust the output voltage of the grid-type energy storage converter is: ; in, For grid-type energy storage converters, the long-term overload factor is a value greater than 1. This is the overload voltage droop factor; when the apparent output power of the grid-connected energy storage converter is greater than... And duration If the grid-type energy storage converter activates overload protection and shuts down, the preset maximum recovery time will be used. T t After the secondary circuit shut down due to overload protection, the locked grid-type energy storage converter restarted.

[0028] In this embodiment, it also includes a smart switch that has been automatically closed, when the energy storage terminal voltage is detected. Below the trip voltage And maintain the tripping time When the intelligent switch is activated, it disconnects and blocks reclosing, reducing the tripping voltage. satisfy:

[0029] in, For grid-type energy storage converters, the long-term overload factor is a value greater than 1. This is the overload voltage droop factor.

[0030] When the load is very heavy, the voltage drops to the rapid tripping voltage. (Fast trip voltage) Less than the tripping voltage When the circuit breaker trips quickly, the holding time is shorter; that is, the quick tripping time is... Less than the tripping time Therefore, this embodiment also includes a method for detecting the voltage at the energy storage terminal of an automatically closed smart switch. Below the fast trip voltage And maintain rapid tripping time When the intelligent switch is activated, it disconnects and blocks reclosing, rapidly tripping the voltage. satisfy:

[0031] in, This is the overload voltage droop factor.

[0032] For scenarios where two or more smart switches are used to divide an AC line into multiple power supply segments, the tripping time of each smart switch... There should be differences. In this embodiment, in the segmented power supply system dominated by the energy storage converter, the tripping time of each smart switch is... The tripping time corresponds to the smart switch whose distance from the smart switch to the off-grid energy storage converter decreases sequentially from closest to farthest, and the smart switch with the longest distance to the off-grid energy storage converter is... The grid connection startup time is greater than that of the distributed power sources in each segment of the segmented power supply system. For example, the smart switches are numbered from nearest to farthest using the off-grid energy storage converter, as follows: Q 1, Q 2 to Q n The corresponding tripping times are as follows: T open1 , T open2 to T openn It should meet T openn <......< T open2 < T open1 ,and T openn The time should be greater than the grid connection startup time of the distributed power source. Similarly, the closing time of each smart switch should be as follows: T close1 , T close2 to T closen .

[0033] For AC lines that are long, the voltage drop caused by active and reactive power transmission on the long line needs to be considered. Therefore, as an optional implementation, this embodiment also includes considering the effects of active and reactive power on the long line, as well as the inductance and resistance of the low-voltage line, on the closing voltage of the intelligent switch. , tripping voltage and fast trip voltage Part or all of the voltage drop compensation caused by active and reactive power transmission over long lines is performed. This voltage drop compensation is achieved by adding the voltage drop caused by active and reactive power transmission over long lines to the original voltage. The voltage drop The calculation steps include: S101, Obtain the line impedance of the main line in the segmented power supply system. Energy storage output voltage The initial line apparent power To estimate the load power of the back end of the smart switch Initialize the intelligent switching voltage in the initial stage. Energy storage output voltage The loop variable k is 1; where, For line resistance, For line reactance, The imaginary unit; Active power Reactive power; S102, calculate the line load current of stage k-1 and the intelligent switching voltage of this stage according to the following formula: , ; in, This represents the line load current in stage k-1. express The conjugate of complex numbers, The intelligent switching voltage for stage k-1; The apparent power of the line in stage k-1, This refers to the intelligent switching voltage at this stage. For energy storage output voltage, Given the line impedance of the main line in a segmented power supply system; calculate the line voltage drop in stage k-1 using the following formula. and power loss on the line : , ; S103, calculate the apparent power of the line in stage k according to the following formula. : ; in, The apparent power of the line in stage k; S104, Determine the intelligent switching voltage of stage k. Intelligent switching voltage in the k-1 stage The absolute value of the difference between them, if the absolute value is greater than or equal to a preset threshold. If the loop variable k is incremented by 1, the process jumps to step S102; otherwise, the pressure drop is calculated according to the following formula. And output:

[0034] in, for The absolute value, for The absolute value of.

[0035] To verify the feasibility of the microgrid segmented power supply restoration method without communication loads in this embodiment, this embodiment is based on Figure 2 The topology of a segmented power supply system dominated by an energy storage converter is simulated. Specifically, this system is divided into three segments by two smart switches (smart switch #1 and smart switch #2), with smart switch #1 located on the side closest to the energy storage converter. To simplify the analysis, only the load and distributed generation are considered. The parameters set in the simulation include: S n It is 10 kW.k 1 is 0.75. k 2 is 0.95, k 3 is 1.1. K v1 It is 8. K v2 It is 10. V 0 is 220 V. T close1 For 1 s, T close2 For 1 s, V close It is 208 V. T open1 It takes 0.3 seconds. T open2 It is 0.1s. V open The voltage is 198 V. The final simulation waveform for the segmented restoration of power to the load after a power outage is as follows: Figures 3-6 As shown. Among them, Figure 3 This is a graph showing the output power of the energy storage converter in this embodiment. Figure 4 This is a graph showing the output voltage of the grid-type energy storage converter in this embodiment. Figure 5 This is a graph showing the load-side voltage of smart switch #1 in this embodiment. Figure 6 This is a graph showing the load-side voltage of smart switch #2 in this embodiment. Figure 3 As shown, after a power outage, energy storage restores power supply, supporting a 5 kW local load. Figure 4 and Figure 5 As shown, smart switch #1 detects that the voltage on the energy storage side is greater than... V close , T close1 After closing the circuit breaker, power supply to the downstream 3.5 kW load was restored, entering a heavy load zone. Due to the sag curve, the line voltage dropped slightly. Afterwards, as... Figure 4 and Figure 6 As shown, smart switch #2 detected that the voltage on the energy storage side was greater than... V close , T close2 After closing the circuit breaker, power supply to the downstream 1.2 kW load was restored. At the 4th second, the load downstream of smart switch #2 suddenly increased by 23 kW, causing a significant drop in line voltage, which was maintained... T open2 Subsequently, smart switch 2 tripped and reclosing was blocked. Simulation results demonstrate the feasibility of the segmented power supply restoration method for microgrids without communication loads in this embodiment.

[0036] In summary, the microgrid load segmented power supply restoration method in this embodiment achieves load segmented power supply restoration by coordinating the "power-voltage" curve within the energy storage with pre-set trigger events within the smart switch, without requiring communication. While avoiding overload and burnout of the energy storage converter, it immediately begins restoring load power after a power outage, improving power supply reliability. Compared to existing research, this invention eliminates the need for a centralized control terminal and communication link, resulting in lower costs and mitigating the risk of centralized control failure due to communication link interruptions caused by external factors, thus achieving higher reliability.

[0037] Furthermore, this embodiment also provides a microgrid segmented power restoration system for non-communication loads, including a microprocessor and a memory interconnected, wherein the microprocessor is programmed or configured to execute the microgrid segmented power restoration method for non-communication loads. This embodiment also provides a computer-readable storage medium storing a computer program or instructions programmed or configured to execute the microgrid segmented power restoration method for non-communication loads via a processor. This embodiment also provides a computer program product, including a computer program or instructions programmed or configured to execute the microgrid segmented power restoration method for non-communication loads via a processor.

[0038] Those skilled in the art will understand that the technical solutions provided by this invention may take the form of a method, system, or computer program product. Therefore, this invention may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this invention may take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, produce an implementation of the flowchart... Figure 1 One or more processes and / or boxes Figure 1 The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0039] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for restoring segmented power supply to a microgrid without communication loads, characterized in that, This includes the restart of the grid-connected energy storage converter after a power outage in a microgrid consisting of a segmented power supply system dominated by energy storage converters, based on the apparent power output of the grid-connected energy storage converter. The system sends commands to adjust the output voltage of the grid-type energy storage converter; after the grid-type energy storage converter restarts, the intelligent switches of each segment of the segmented power supply system detect the voltage at the energy storage terminal. When the energy storage terminal voltage is satisfied Higher than the closing voltage And maintain the closing time The intelligent switch will restore power to the subsequent load segment when it closes; otherwise, it will not operate; closing voltage satisfy: ； in, This is the reference output voltage for the grid-type energy storage converter. This is the heavy load voltage droop factor. For constant parameters less than 1, less than 1 and greater than constant parameters, This refers to the rated power of the grid-type energy storage converter.

2. The method for restoring segmented power supply to a microgrid without communication loads according to claim 1, characterized in that, The segmented power supply system dominated by the energy storage converter includes energy storage batteries, grid-type energy storage converters, AC lines, and smart switches. The energy storage batteries are connected to the DC side of the grid-type energy storage converters to provide active power and absorb reactive power for the microgrid. The AC side of the grid-type energy storage converters is connected to the AC lines, which are single-chain network topologies. The smart switches for each segment are connected in series on the main line of the AC lines, dividing the loads and distributed power sources connected to the main line into multiple groups. The energy storage terminal voltage... V bat This refers to the voltage detected by the intelligent switch near the grid-type energy storage converter.

3. The method for restoring segmented power supply to a microgrid without communication load according to claim 1, characterized in that, The apparent power output of the grid-type energy storage converter The commands for adjusting the output voltage of the grid-connected energy storage converter include: when the apparent power output of the grid-connected energy storage converter... Less than or equal to At that time, the output voltage command for adjusting the grid-type energy storage converter is: ； in, This refers to the output voltage command of the grid-connected energy storage converter; when the output apparent power of the grid-connected energy storage converter... Greater than and less than At that time, the output voltage command for adjusting the grid-type energy storage converter is: ； When the apparent power output of the grid-type energy storage converter is greater than and less than At that time, the output voltage command for adjusting the grid-type energy storage converter is: ； in, For grid-type energy storage converters, the long-term overload factor is a value greater than 1. This is the overload voltage droop factor; when the apparent output power of the grid-connected energy storage converter is greater than... And duration If the grid-type energy storage converter activates overload protection and shuts down, the preset maximum recovery time will be used. T t After the secondary circuit shut down due to overload protection, the locked grid-type energy storage converter restarted.

4. The method for restoring segmented power supply to a microgrid without communication load according to claim 1, characterized in that, This also includes smart switches that have already closed automatically, when the energy storage terminal voltage is detected. Below the trip voltage And maintain the tripping time When the intelligent switch is activated, it disconnects and blocks reclosing, reducing the tripping voltage. satisfy: in, For grid-type energy storage converters, the long-term overload factor is a value greater than 1. This is the overload voltage droop factor.

5. The method for restoring segmented power supply to a microgrid without communication load according to claim 4, characterized in that, This also includes smart switches that have already closed automatically, when the energy storage terminal voltage is detected. Below the fast trip voltage And maintain rapid tripping time When the intelligent switch is activated, it disconnects and blocks reclosing, with the fast trip voltage... Less than the tripping voltage Preset maintenance fast tripping time Less than the tripping time Fast trip voltage satisfy: in, This is the overload voltage droop factor.

6. The method for restoring segmented power supply to a microgrid without communication load according to claim 1, characterized in that, In the segmented power supply system dominated by the energy storage converter, the tripping time of each smart switch is... The tripping time corresponds to the smart switch whose distance from the smart switch to the off-grid energy storage converter decreases sequentially from closest to farthest, and the smart switch with the longest distance to the off-grid energy storage converter is... It is greater than the grid connection startup time of the distributed power sources in each segment of the segmented power supply system.

7. The method for restoring segmented power supply to a microgrid without communication load according to claim 5, characterized in that, This also includes the closing voltage of the smart switch. , tripping voltage and fast trip voltage Part or all of the voltage drop compensation caused by active and reactive power transmission over long lines is performed. This voltage drop compensation is achieved by adding the voltage drop caused by active and reactive power transmission over long lines to the original voltage. The voltage drop The calculation steps include: S101, Obtain the line impedance of the main line in the segmented power supply system. Energy storage output voltage The initial line apparent power To estimate the load power of the back end of the smart switch Initialize the intelligent switching voltage in the initial stage. Energy storage output voltage The loop variable k is 1; where, For line resistance, For line reactance, The imaginary unit; Active power Reactive power; S102, calculate the line load current of stage k-1 and the intelligent switching voltage of this stage according to the following formula: ， ； in, This represents the line load current in stage k-1. express The conjugate of complex numbers, The intelligent switching voltage for stage k-1; The apparent power of the line in stage k-1, This refers to the intelligent switching voltage at this stage. For energy storage output voltage, Given the line impedance of the main line in a segmented power supply system; calculate the line voltage drop in stage k-1 using the following formula. and power loss on the line : ， ； S103, calculate the apparent power of the line in stage k according to the following formula. : ； in, The apparent power of the line in stage k; S104, Determine the intelligent switching voltage of stage k. Intelligent switching voltage in the k-1 stage The absolute value of the difference between them, if the absolute value is greater than or equal to a preset threshold. If the loop variable k is incremented by 1, the process jumps to step S102; otherwise, the pressure drop is calculated according to the following formula. And output: in, for The absolute value, for The absolute value of.

8. A microgrid segmented power restoration system for non-communication loads, comprising a microprocessor and a memory interconnected, characterized in that, The microprocessor is programmed or configured to execute the microgrid segmented power supply restoration method for no-communication load as described in any one of claims 1 to 7.

9. A computer-readable storage medium storing a computer program or instructions, characterized in that, The computer program or instructions are programmed or configured to execute, via a processor, the microgrid segmented power supply restoration method for no-communication loads as described in any one of claims 1 to 7.

10. A computer program product, comprising a computer program or instructions, characterized in that, The computer program or instructions are programmed or configured to execute, via a processor, the microgrid segmented power supply restoration method for no-communication loads as described in any one of claims 1 to 7.

Images