Microgrid group virtual substation voltage control method and system

Abstract

The present invention discloses a voltage control method and system for a microgrid group virtual substation. The method comprises: judging whether there is a microgrid grid-connected switch with a voltage exceeding the limit according to the new energy generation information and load information of each microgrid in the virtual substation, and if so, judging whether other microgrids are in a power shortage state, and if they are in a power shortage state, transmitting electric energy to the corresponding microgrid in the power shortage state, otherwise detecting the charge state of the energy storage system of all microgrids in the virtual substation, and charging when the charge state is less than 1, otherwise adjusting the voltage by the inverter reactive power regulation method. When the voltage is still not met, the electric energy is transmitted to the adjacent power shortage distribution network through high-voltage transmission of electric energy, otherwise the power generation level of the new energy in the target virtual substation is reduced. The method and system of the present invention can ensure that the new energy electric energy is absorbed at the maximum level, and avoid the off-grid operation of new energy due to voltage exceeding the limit.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage control, and in particular to a voltage control method and system for a microgrid group virtual substation. Background Art

[0002] The virtual substation connects different regions, substations, and protection measurement and control through an optical fiber communication network to form a monitoring network to monitor and control each switch mechanism. The essence of the virtual substation is a control and dispatching center. In a distribution network containing new energy, the role of the DC / AC inverter is to convert the electricity generated by photovoltaics into DC and AC, keep it consistent with the various power indicators of the power grid, and realize power access to the grid under the conditions of grid connection. At present, there are many types of inverters, and there are various protection modules inside the inverter, such as: a series of parameters such as the inverter's starting voltage, minimum operating voltage, maximum input voltage, etc. At the same time, inside the inverter, it contains various protection and high voltage tolerance and low voltage ride-through functions. In the IGBT module of the inverter, the voltage level can be adjusted by adjusting the active power and reactive power output to avoid the shedding of the grid-connected switch.

[0003] However, when the voltage is not met, the grid-connected switch of the new energy power generation system will fall off, causing the new energy power generation system to be off-grid and unable to transmit electricity to the distribution network. The off-grid operation of the new energy power generation system will not only cause insufficient absorption of photovoltaic resources, but also cause power failures and other problems to users of the distribution network. Therefore, preventing the grid-connected switch of the power generation system from falling off is of great significance for the dispatch of electric energy and the regulation of voltage. Summary of the invention

[0004] The purpose of the present invention is to provide a microgrid group virtual substation voltage control method and system, which can improve the consumption level of new energy electric energy and avoid the new energy being disconnected from the grid due to voltage exceeding the limit.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A virtual substation voltage control method, comprising:

[0007] Obtain the renewable energy generation information and load information of each microgrid in the target virtual substation;

[0008] According to the renewable energy power generation information and load information of each microgrid in the target virtual substation, it is determined whether there is a microgrid grid-connected switch with a voltage exceeding the limit, and a first determination result is obtained;

[0009] If the first judgment result is yes, then determine whether other microgrids in the target virtual substation are in a power shortage state to obtain a second judgment result; the other microgrids are microgrids other than the microgrid corresponding to the microgrid whose grid-connected switch voltage exceeds the limit;

[0010] If the second judgment result is yes, then electric energy dispatch is performed;

[0011] If the second judgment result is no, then detecting whether the charge states of the energy storage systems of all microgrids in the target virtual substation are all 1, and obtaining a third judgment result;

[0012] If the third judgment result is yes, the voltage is regulated by using a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit;

[0013] If the third judgment result is no, battery energy storage is performed.

[0014] Optionally, the inverter of the microgrid corresponding to the microgrid grid-connected switch that exceeds the voltage limit adopts a reactive power regulation method to regulate the voltage, and then further includes:

[0015] Determine whether a voltage of a microgrid grid-connected switch corresponding to the voltage-regulated microgrid exceeds a limit, and obtain a fourth determination result;

[0016] If the fourth judgment result is yes, then determine whether there is a virtual substation whose power generation is less than the power consumption, and obtain a fifth judgment result;

[0017] If the fifth judgment result is yes, then electric energy scheduling is performed;

[0018] If the fifth judgment result is no, the output of the new energy generator set in the target virtual substation is reduced or the new energy generator set is shut down.

[0019] Optionally, judging whether there is a microgrid grid-connected switch with a voltage exceeding a limit according to the renewable energy power generation information and load information of each microgrid in the target virtual substation specifically includes:

[0020] Obtaining power generation and power consumption of the microgrid in the target virtual substation;

[0021] Determine whether the power generation of the microgrid in the target virtual substation is greater than the power consumption of the microgrid in the target virtual substation to obtain a sixth determination result;

[0022] If the sixth judgment result is yes, the voltage collected by the inverter in the microgrid is obtained, and the collected voltage is compared with the voltage upper limit value. When the collected voltage is greater than the voltage upper limit value, it is determined that the voltage of the microgrid grid-connected switch exceeds the limit;

[0023] If the sixth judgment result is no, it is determined that the voltage of the microgrid grid-connected switch does not exceed the limit.

[0024] Optionally, if the second judgment result is yes, then electric energy scheduling is performed, and then the method further includes:

[0025] Determine whether a microgrid grid-connected switch corresponding to the microgrid after the electric energy dispatch has a voltage over-limit, and obtain a seventh determination result;

[0026] If the seventh judgment result is yes, the step of "detecting whether the charge states of the energy storage systems of all microgrids in the target virtual substation are all 1" is executed.

[0027] Optionally, if the third judgment result is no, battery energy storage is performed, and then the method further includes:

[0028] Determine whether a microgrid grid-connected switch corresponding to the microgrid after battery energy storage has a voltage over-limit, and obtain an eighth determination result;

[0029] If the eighth judgment result is yes, the step of "adopting a reactive power regulation method to regulate the voltage through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit" is executed.

[0030] The present invention also provides a virtual substation voltage control system, comprising:

[0031] A parameter acquisition module is used to obtain the renewable energy generation information and load information of each microgrid in the target virtual substation;

[0032] A first judgment module is used to judge whether there is a microgrid grid-connected switch with a voltage exceeding the limit according to the new energy power generation information and load information of each microgrid in the target virtual substation, and obtain a first judgment result; if the first judgment result is yes, execute the second judgment module;

[0033] A second judgment module is used to judge whether other microgrids in the target virtual substation are in a power shortage state, and obtain a second judgment result; the other microgrids are microgrids other than the microgrid corresponding to the microgrid grid-connected switch voltage exceeding the limit; if the second judgment result is yes, the electric energy dispatching module is executed; if the second judgment result is no, the third judgment module is executed;

[0034] An electric energy dispatching module, used for electric energy dispatching;

[0035] A third judgment module is used to detect whether the charge state of the energy storage systems of all microgrids in the target virtual substation is 1, and obtain a third judgment result; if the third judgment result is yes, the reactive power regulation module is executed; if the third judgment result is no, the battery energy storage module is executed;

[0036] A reactive power regulation module is used to regulate the voltage by adopting a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit;

[0037] A battery energy storage module is used for battery energy storage.

[0038] Optionally, the system further includes:

[0039] The fourth judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after voltage adjustment exceeds the limit, and obtain a fourth judgment result; if the fourth judgment result is yes, the fifth judgment module is executed;

[0040] A fifth judgment module is used to judge whether there is a virtual substation whose power generation is less than the power consumption, and obtain a fifth judgment result; if the fifth judgment result is yes, the power scheduling module is executed; if the fifth judgment result is no, the shutdown module is executed;

[0041] The shutdown module is used to reduce the output of the new energy generator set in the target virtual substation or shut down the new energy generator set.

[0042] Optionally, the first judgment module specifically includes:

[0043] A data acquisition unit, used to acquire the power generation and power consumption of the microgrid in the target virtual substation;

[0044] The sixth judgment unit is used to judge whether the power generation of the microgrid in the target virtual substation is greater than the power consumption of the microgrid in the target virtual substation, and obtain a sixth judgment result; if the sixth judgment result is yes, the voltage collected by the inverter in the microgrid is obtained, and the collected voltage is compared with the voltage upper limit value. When the collected voltage is greater than the voltage upper limit value, it is determined that the voltage of the microgrid grid-connected switch has exceeded the limit; if the sixth judgment result is no, it is determined that the voltage of the microgrid grid-connected switch has not exceeded the limit.

[0045] Optionally, the system further includes:

[0046] The seventh judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after the electric energy scheduling is over the limit, and obtain the seventh judgment result; if the seventh judgment result is yes, the third judgment module is executed.

[0047] Optionally, the system further includes:

[0048] The eighth judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after battery energy storage is over the limit, and obtain the eighth judgment result; if the eighth judgment result is yes, the reactive power regulation module.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention proposes a voltage control method and system for a microgrid group virtual substation. According to the new energy generation information and load information of each microgrid in the virtual substation, it is determined whether there is a microgrid grid-connected switch with a voltage exceeding the limit. If so, it is determined whether other microgrids are in a power shortage state. If they are in a power shortage state, the electric energy is transmitted to the corresponding microgrid in the power shortage state. Otherwise, the charge state of the energy storage system of all microgrids in the virtual substation is detected. When the charge state is less than 1, the energy storage system is charged. Otherwise, the voltage is adjusted by using a reactive power adjustment method through the inverter of the microgrid with a voltage exceeding the limit. The method and system of the present invention can ensure that the new energy electric energy is consumed at the maximum level and avoid the disconnection of new energy due to voltage exceeding the limit.

[0051] In addition, when the reactive power regulation of the inverter still cannot meet the voltage demand, the electric energy is transmitted to the adjacent power-deficient distribution network through high-voltage transmission of electric energy. If it does not exist, the power generation level of renewable energy in the target virtual substation is reduced to ensure that the voltage is maintained within the normal working range. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0053] Figure 1 This is a flow chart of a method for controlling voltage of a virtual substation in a microgrid group according to an embodiment of the present invention;

[0054] Figure 2 It is a structural diagram of the voltage control system of a microgrid virtual substation in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The purpose of the present invention is to provide a microgrid group virtual substation voltage control method and system, which can improve the consumption level of new energy electric energy and avoid the new energy being disconnected from the grid due to voltage exceeding the limit.

[0057] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Example

[0059] In order to illustrate the voltage control process of the microgrid virtual substation of the present invention, the voltage over-limit and power flow reverse transmission principles are first introduced.

[0060] 1) When the capacity of the new energy distributed power source is greater than the total load power, according to the power flow calculation, the voltage at the beginning of the line will be higher than the upper limit voltage of the inverter, causing the inverter to be disconnected from the grid.

[0061] 2) When the distributed power source is operating in an isolated island, when the distributed power source's own load is less than the distributed power source's power generation level, the voltage at the access point will rise, exceeding the maximum operating voltage, causing the inverter to be disconnected from the grid.

[0062] Similarly, when the distributed power generation is operating in an isolated island, the grid-connected inverter will also be disconnected due to voltage exceeding the limit.

[0063] In order to solve the problem that the photovoltaic output is greater than the load level, the present invention first adjusts the voltage through linear reactive power control to solve the absorption problem of the new energy power generation system and the voltage over-limit problem. The voltage is adjusted by collecting the voltage and current of the IGBT module in the inverter and adopting a feedback link. If the voltage remains between the normal working voltages, the voltage and current are continued to be collected. The virtual substation adjusts the voltage step by step according to the priority order to optimize the scheduling plan and promote the absorption level of new energy. The priority order is: Level I is adjacent power grid scheduling, Level II is energy storage scheduling, and Level III is inverter adjustment scheduling.

[0064] Figure 1 FIG. 1 is a flow chart of a method for controlling voltage of a microgrid virtual substation in an embodiment of the present invention. Figure 1 As shown, a voltage control method for a microgrid virtual substation includes:

[0065] Step 101: Obtain the renewable energy generation information and load information of each microgrid in the target virtual substation.

[0066] Step 102: Based on the renewable energy generation information and load information of each microgrid in the target virtual substation, determine whether there is a microgrid grid-connected switch with a voltage exceeding the limit, and obtain a first judgment result; if the first judgment result is yes, execute step 103.

[0067] Step 102 specifically includes:

[0068] Obtain the power generation and power consumption of the microgrid in the target virtual substation;

[0069] Determine whether the power generation of the microgrid in the target virtual substation is greater than the power consumption of the microgrid in the target virtual substation, and obtain a sixth determination result;

[0070] If the sixth judgment result is yes, the voltage collected by the inverter in the microgrid is obtained, and the collected voltage is compared with the voltage upper limit value. When the collected voltage is greater than the voltage upper limit value, it is determined that the voltage of the microgrid grid-connected switch exceeds the limit;

[0071] If the sixth judgment result is no, it is determined that the voltage of the microgrid grid-connected switch has not exceeded the limit.

[0072] Step 103: Determine whether other microgrids in the target virtual substation are in a power shortage state, and obtain a second determination result; other microgrids are microgrids other than the microgrid corresponding to the microgrid whose grid-connected switch voltage exceeds the limit; if the second determination result is yes, execute step 104. If the second determination result is no, execute step 105.

[0073] Step 104: Perform power dispatch.

[0074] Step 104, and then further includes:

[0075] Determine whether a microgrid grid-connected switch corresponding to the microgrid after the electric energy dispatch has a voltage over-limit, and obtain a seventh determination result;

[0076] If the seventh judgment result is yes, the step of "detecting whether the charge states of the energy storage systems of all microgrids in the target virtual substation are all 1" is executed.

[0077] Step 105: Detect whether the charge states of the energy storage systems of all microgrids in the target virtual substation are all 1, and obtain a third judgment result; if the third judgment result is yes, execute step 107. If the third judgment result is no, execute step 106.

[0078] Step 106: Perform battery energy storage.

[0079] Step 106, further comprising:

[0080] Determine whether a microgrid grid-connected switch corresponding to the microgrid after battery energy storage has a voltage over-limit, and obtain an eighth determination result;

[0081] If the result of the eighth judgment is yes, the step of "adjusting the voltage by adopting a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit" is executed.

[0082] Step 107: voltage is regulated by using a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit.

[0083] Step 108: Determine whether the voltage of the microgrid grid-connected switch corresponding to the voltage-regulated microgrid exceeds the limit, and obtain a fourth determination result; if the fourth determination result is yes, execute step 109.

[0084] Step 109: Determine whether there is a virtual substation whose power generation is less than the power consumption, and obtain a fifth determination result; if the fifth determination result is yes, execute step 104; if the fifth determination result is no, execute step 110.

[0085] Step 110: Reduce the output of the new energy generator set in the target virtual substation or shut down the new energy generator set.

[0086] Figure 2 FIG. 1 is a structural diagram of a voltage control system for a microgrid virtual substation in an embodiment of the present invention. Figure 2 As shown, a microgrid group virtual substation voltage control system includes:

[0087] The parameter acquisition module 201 is used to acquire the renewable energy generation information and load information of each microgrid in the target virtual substation.

[0088] The first judgment module 202 is used to determine whether there is a microgrid grid-connected switch with a voltage exceeding the limit based on the new energy power generation information and load information of each microgrid in the target virtual substation, and obtain a first judgment result; if the first judgment result is yes, execute the second judgment module 203.

[0089] The first judgment module 202 specifically includes:

[0090] A data acquisition unit, used to acquire the power generation and power consumption of the microgrid in the target virtual substation;

[0091] The sixth judgment unit is used to judge whether the power generation of the microgrid in the target virtual substation is greater than the power consumption of the microgrid in the target virtual substation, and obtain a sixth judgment result; if the sixth judgment result is yes, the voltage collected by the inverter in the microgrid is obtained, and the collected voltage is compared with the voltage upper limit value. When the collected voltage is greater than the voltage upper limit value, it is determined that the voltage of the microgrid grid-connected switch has exceeded the limit; if the sixth judgment result is no, it is determined that the voltage of the microgrid grid-connected switch has not exceeded the limit.

[0092] The second judgment module 203 is used to judge whether other microgrids in the target virtual substation are in a power outage state and obtain a second judgment result; other microgrids are microgrids other than the microgrid corresponding to the microgrid whose grid-connected switch voltage exceeds the limit; if the second judgment result is yes, the power scheduling module 204 is executed; if the second judgment result is no, the third judgment module 205 is executed.

[0093] The electric energy dispatching module 204 is used for performing electric energy dispatching.

[0094] The third judgment module 205 is used to detect whether the charge state of the energy storage systems of all microgrids in the target virtual substation is 1, and obtain a third judgment result; if the third judgment result is yes, the reactive power regulation module 207 is executed; if the third judgment result is no, the battery energy storage module 206 is executed.

[0095] The battery energy storage module 206 is used for battery energy storage.

[0096] Among them, the seventh judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after the power scheduling is over-limit, and obtain the seventh judgment result; if the seventh judgment result is yes, the third judgment module 205 is executed.

[0097] The reactive power regulation module 207 is used to regulate the voltage by adopting a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch with the voltage exceeding the limit.

[0098] Among them, the eighth judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after battery energy storage exceeds the limit, and obtain the eighth judgment result; if the eighth judgment result is yes, the reactive power regulation module is used.

[0099] The fourth judgment module 208 is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after voltage regulation exceeds the limit, and obtain a fourth judgment result; if the fourth judgment result is yes, the fifth judgment module 209 is executed.

[0100] The fifth judgment module 209 is used to judge whether there is a virtual substation whose power generation is less than the power consumption, and obtain the fifth judgment result; if the fifth judgment result is yes, the power scheduling module 204 is executed; if the fifth judgment result is no, the shutdown module 210 is executed.

[0101] The shutdown module 210 is used to reduce the output of the new energy generator set in the target virtual substation or shut down the new energy generator set.

[0102] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A virtual substation voltage control method, characterized in that: include: Obtain the renewable energy generation information and load information of each microgrid in the target virtual substation; According to the renewable energy power generation information and load information of each microgrid in the target virtual substation, it is determined whether there is a microgrid grid-connected switch with a voltage exceeding the limit, and a first determination result is obtained; If the first judgment result is yes, then determine whether other microgrids in the target virtual substation are in a power shortage state to obtain a second judgment result; the other microgrids are microgrids other than the microgrid corresponding to the microgrid whose grid-connected switch voltage exceeds the limit; If the second judgment result is yes, then electric energy dispatch is performed; If the second judgment result is no, then detecting whether the charge states of the energy storage systems of all microgrids in the target virtual substation are all 1, and obtaining a third judgment result; If the third judgment result is yes, the voltage is regulated by using a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit; If the third judgment result is no, battery energy storage is performed; The determining whether there is a microgrid grid-connected switch with a voltage exceeding the limit according to the renewable energy power generation information and load information of each microgrid in the target virtual substation specifically includes: obtaining the power generation and power consumption of the microgrid in the target virtual substation; determining whether the power generation of the microgrid in the target virtual substation is greater than the power consumption of the microgrid in the target virtual substation, and obtaining a sixth determination result; If the sixth judgment result is yes, the voltage collected by the inverter in the microgrid is obtained, and the collected voltage is compared with the voltage upper limit value. When the collected voltage is greater than the voltage upper limit value, it is determined that the voltage of the microgrid grid-connected switch has exceeded the limit; if the sixth judgment result is no, it is determined that the voltage of the microgrid grid-connected switch has not exceeded the limit.

2. The virtual substation voltage control method according to claim 1, characterized in that: The inverter of the microgrid corresponding to the microgrid grid-connected switch that exceeds the voltage limit adopts a reactive power regulation method to regulate the voltage, and then further includes: Determine whether a voltage of a microgrid grid-connected switch corresponding to the voltage-regulated microgrid exceeds a limit, and obtain a fourth determination result; If the fourth judgment result is yes, then determine whether there is a virtual substation whose power generation is less than the power consumption, and obtain a fifth judgment result; If the fifth judgment result is yes, then electric energy scheduling is performed; If the fifth judgment result is no, the output of the new energy generator set in the target virtual substation is reduced or the new energy generator set is shut down.

3. The virtual substation voltage control method according to claim 1, characterized in that: If the second judgment result is yes, then the electric energy scheduling is performed, and then the method further includes: Determine whether a microgrid grid-connected switch corresponding to the microgrid after the electric energy dispatch has a voltage over-limit, and obtain a seventh determination result; If the seventh judgment result is yes, execute the step of "detecting whether the charge status of the energy storage systems of all microgrids in the target virtual substation is 1".

4. The virtual substation voltage control method according to claim 1, characterized in that: If the third judgment result is no, battery energy storage is performed, and then the method further includes: Determine whether a microgrid grid-connected switch corresponding to the microgrid after battery energy storage has a voltage over-limit, and obtain an eighth determination result; If the eighth judgment result is yes, the step of "adjusting the voltage by adopting a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit" is executed.

5. A virtual substation voltage control system, characterized in that: include: A parameter acquisition module is used to obtain the renewable energy generation information and load information of each microgrid in the target virtual substation; A first judgment module is used to judge whether there is a microgrid grid-connected switch with a voltage exceeding the limit according to the new energy power generation information and load information of each microgrid in the target virtual substation, and obtain a first judgment result; if the first judgment result is yes, execute the second judgment module; A second judgment module is used to judge whether other microgrids in the target virtual substation are in a power shortage state, and obtain a second judgment result; the other microgrids are microgrids other than the microgrid corresponding to the microgrid whose grid-connected switch voltage exceeds the limit; If the second judgment result is yes, executing the electric energy scheduling module; If the second judgment result is no, executing the third judgment module; An electric energy dispatching module, used for electric energy dispatching; A third judgment module is used to detect whether the charge state of the energy storage systems of all microgrids in the target virtual substation is 1, and obtain a third judgment result; if the third judgment result is yes, the reactive power regulation module is executed; if the third judgment result is no, the battery energy storage module is executed; A reactive power regulation module is used to regulate the voltage by adopting a reactive power regulation method through the inverter of the microgrid corresponding to the microgrid grid-connected switch whose voltage exceeds the limit; A battery energy storage module, used for battery energy storage; The first judgment module specifically includes: a data acquisition unit, used to obtain the power generation and power consumption of the microgrid in the target virtual substation; a sixth judgment unit, used to judge whether the power generation of the microgrid in the target virtual substation is greater than the power consumption of the microgrid in the target virtual substation, and obtain a sixth judgment result; If the sixth judgment result is yes, the voltage collected by the inverter in the microgrid is obtained, and the collected voltage is compared with the voltage upper limit value. When the collected voltage is greater than the voltage upper limit value, it is determined that the voltage of the microgrid grid-connected switch has exceeded the limit; if the sixth judgment result is no, it is determined that the voltage of the microgrid grid-connected switch has not exceeded the limit.

6. The virtual substation voltage control system according to claim 5, characterized in that: The system further comprises: The fourth judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after voltage adjustment exceeds the limit, and obtain a fourth judgment result; if the fourth judgment result is yes, the fifth judgment module is executed; A fifth judgment module is used to judge whether there is a virtual substation whose power generation is less than the power consumption, and obtain a fifth judgment result; if the fifth judgment result is yes, the power scheduling module is executed; if the fifth judgment result is no, the shutdown module is executed; The shutdown module is used to reduce the output of the new energy generator set in the target virtual substation or shut down the new energy generator set.

7. The virtual substation voltage control system according to claim 5, characterized in that: The system further comprises: The seventh judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after the electric energy scheduling is over the limit, and obtain the seventh judgment result; if the seventh judgment result is yes, the third judgment module is executed.

8. The virtual substation voltage control system according to claim 5, characterized in that: The system further comprises: The eighth judgment module is used to judge whether the voltage of the microgrid grid-connected switch corresponding to the microgrid after battery energy storage is over the limit, and obtain the eighth judgment result; if the eighth judgment result is yes, the reactive power regulation module.

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