Island micro-grid control method and device and storage medium

Abstract

The invention discloses a control method and device for an island micro-grid and a storage medium. The method comprises the steps that the real-time frequency of the island micro-grid is detected according to a voltage signal of the island micro-grid; setting a frequency modulation stage of the island micro-grid according to the real-time frequency of the island micro-grid; if the frequency modulation stage is a primary frequency modulation stage, distributing active power and regulation and control frequency to the plurality of virtual synchronous generators according to the capacities of the plurality of virtual synchronous generators; if the frequency modulation stage is a secondary frequency modulation stage, detecting a load disturbance mode of the island microgrid according to the active power of the plurality of virtual synchronous generators; and according to the load disturbance mode of the island micro-grid and the capacities of the virtual synchronous generators, active power and regulation and control frequency are distributed to the virtual synchronous generators. According to the embodiment, the active power is distributed according to the capacity of the virtual synchronous generator, oscillation in the frequency supporting process is suppressed, and the frequency stability of the island micro-grid is improved.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a control method, device and storage medium for an island microgrid. Background Art

[0002] Multiple VSGs (Virtual Synchronous Generators) are deployed in parallel in an island microgrid to increase the capacity of the island microgrid and achieve effective distribution of output power from different power sources. When a VSG fails, the other VSGs can still continue to operate, jointly supporting the frequency stability of the island microgrid and improving the stability and reliability of the island microgrid.

[0003] At present, due to the differences in the intrinsic parameters and network structures between different VSGs, a power distribution method based on droop control is usually used to distribute power to different VSGs. That is, the power distribution between each VSG is realized according to the droop coefficient, and a PI (Proportional-Integral) controller is introduced in the frequency regulation link to realize the frequency regulation of the island microgrid.

[0004] However, the power allocation method based on droop control has deviations in the power allocation of different VSGs, and the frequency of the island microgrid fluctuates. Summary of the Invention

[0005] In view of this, the present invention provides a control method, device and storage medium for an island microgrid, which are used to output power according to capacity of multiple VSGs in the island microgrid and stabilize the frequency of the island microgrid.

[0006] A first aspect of the present invention provides a control method for an island microgrid, wherein the island microgrid uses multiple virtual synchronous generators, the method comprising:

[0007] Detecting the real-time frequency of the isolated island microgrid according to the voltage signal of the isolated island microgrid;

[0008] Setting a frequency modulation stage of the island microgrid according to the real-time frequency of the island microgrid;

[0009] If the frequency regulation stage is a primary frequency regulation stage, active power is allocated to the multiple virtual synchronous generators and the frequency is regulated according to the capacities of the multiple virtual synchronous generators;

[0010] If the frequency regulation stage is a secondary frequency regulation stage, detecting a load disturbance mode of the island microgrid according to the active power of the plurality of virtual synchronous generators;

[0011] Active power is allocated to the multiple virtual synchronous generators and the frequency is regulated according to the load disturbance mode of the isolated island microgrid and the capacity of the multiple virtual synchronous generators.

[0012] A second aspect of the present invention provides a control device for an island microgrid, wherein the island microgrid uses multiple virtual synchronous generators, and the device includes:

[0013] A real-time frequency detection module, configured to detect the real-time frequency of the isolated island microgrid based on the voltage signal of the isolated island microgrid;

[0014] A frequency modulation stage setting module, configured to set the frequency modulation stage of the island microgrid according to the real-time frequency of the island microgrid;

[0015] a primary frequency regulation and control module, configured to allocate active power and regulate frequency to the plurality of virtual synchronous generators according to the capacities of the plurality of virtual synchronous generators if the frequency regulation stage is the primary frequency regulation stage;

[0016] a load disturbance mode detection module, configured to detect the load disturbance mode of the island microgrid based on the active power of the plurality of virtual synchronous generators if the frequency regulation stage is the secondary frequency regulation stage;

[0017] The secondary frequency regulation module is used to allocate active power and regulate frequency to the multiple virtual synchronous generators according to the load disturbance mode of the isolated island microgrid and the capacity of the multiple virtual synchronous generators.

[0018] A third aspect of the present invention provides an electronic device, comprising:

[0019] at least one processor; and

[0020] a memory communicatively connected to the at least one processor; wherein,

[0021] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the isolated island microgrid as described in the first aspect above.

[0022] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the control method for the island microgrid as described in the first aspect above.

[0023] A fifth aspect of the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the control method of the isolated island microgrid as described in the first aspect above.

[0024] In this embodiment, multiple virtual synchronous generators are used in an island microgrid. The real-time frequency of the island microgrid is detected based on the voltage signal of the island microgrid. The frequency regulation stage of the island microgrid is set based on the real-time frequency of the island microgrid. If the frequency regulation stage is the primary frequency regulation stage, active power is allocated to the multiple virtual synchronous generators and the frequency is regulated based on the capacity of the multiple virtual synchronous generators. If the frequency regulation stage is the secondary frequency regulation stage, the load disturbance mode of the island microgrid is detected based on the active power of the multiple virtual synchronous generators. Active power is allocated to the multiple virtual synchronous generators and the frequency is regulated based on the load disturbance mode of the island microgrid and the capacity of the multiple virtual synchronous generators. This embodiment allocates active power according to the capacity of the virtual synchronous generators, suppresses oscillations during the frequency support process, and improves the frequency stability of the island microgrid.

[0025] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0027] Figure 1 This is a flow chart of a control method for an island microgrid provided in Example 1 of the present invention.

[0028] Figure 2 This is an active power distribution curve diagram of the VSG in the primary frequency modulation stage provided by the first embodiment of the present invention.

[0029] Figure 3 This is a frequency change curve of an island microgrid in the primary frequency regulation stage provided by the first embodiment of the present invention.

[0030] Figure 4 This is an active power distribution curve diagram of the VSG in a step change mode of the secondary frequency modulation stage provided in the first embodiment of the present invention.

[0031] Figure 5 This is a frequency change curve of an island microgrid in a step change mode in the secondary frequency modulation stage provided by the first embodiment of the present invention.

[0032] Figure 6This is an active power distribution curve diagram of the VSG in a dynamic slow-changing mode in the secondary frequency modulation stage provided by the first embodiment of the present invention.

[0033] Figure 7 This is a frequency change curve of an island microgrid in a dynamic slow change mode in the secondary frequency regulation stage provided by the first embodiment of the present invention.

[0034] Figure 8 This is a structural diagram of a control device for an island microgrid provided in a second embodiment of the present invention.

[0035] Figure 9 This is a structural diagram of an electronic device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can cover sequential implementations other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] Example 1

[0039] See also Figure 1 , shows a flow chart of a control method for an isolated microgrid provided by the first embodiment of the present invention. The method can be executed by a control device of the isolated microgrid. The control device of the isolated microgrid can be implemented in the form of hardware and / or software. The control device of the isolated microgrid can be configured in an electronic device. Figure 1 As shown, the method includes:

[0040] Step 101: Detect the real-time frequency of the island microgrid based on the voltage signal of the island microgrid.

[0041] In practical applications, an island microgrid, also known as an island grid, refers to a local power system or several local power systems connected through a common connection point and electrically separated from the rest of the power system. That is, an island microgrid is a local power grid constructed by multiple groups of small generators, and its power generation system and load constitute an isolated grid system that can operate independently.

[0042] In this embodiment, multiple virtual synchronous generators are used in the isolated microgrid, and a signal detection device is configured at the outlet of the isolated microgrid. The signal detection device samples the voltage signal and active power P at the outlet in real time. k .

[0043] The waveform of the voltage signal in the island microgrid is analyzed in real time using algorithms such as FFT (Fast Fourier Transform), so as to calculate the real-time frequency f of the island microgrid.

[0044] Step 102: Setting the frequency regulation phase of the island microgrid according to the real-time frequency of the island microgrid.

[0045] In this embodiment, the operating status of the island microgrid can be analyzed from the real-time frequency of the island microgrid, so as to set a suitable frequency regulation stage for the island microgrid.

[0046] In a specific implementation, the frequency deviation value is obtained by calculating the difference between the real-time frequency f of the island microgrid and the preset frequency rated value f0.

[0047] Determine whether the absolute value of the frequency deviation is less than or equal to the preset frequency modulation threshold f set , that is, |f-f0|≤f set , where the frequency modulation threshold f set is the critical value of the island microgrid in the primary frequency regulation stage and the secondary frequency regulation stage. For example, f set =0.2Hz.

[0048] If the absolute value of the frequency deviation value is less than or equal to the preset frequency regulation threshold, the frequency regulation stage of the island microgrid is set to the primary frequency regulation stage.

[0049] If the absolute value of the frequency deviation is greater than the preset frequency regulation threshold, the frequency regulation stage of the island microgrid is set to the secondary frequency regulation stage.

[0050] Among them, the primary frequency regulation stage refers to the process of increasing or decreasing the output of the generator through the automatic adjustment of the speed regulator to maintain the stability of the frequency of the island microgrid when the frequency of the island microgrid deviates from the rated value.

[0051] The secondary frequency regulation stage, also known as automatic generation control (AGC), refers to the process of restoring the frequency of the island microgrid to the rated value by adjusting the active power output of the generator on the basis of the primary frequency regulation stage.

[0052] Step 103: If the frequency regulation stage is a primary frequency regulation stage, active power is allocated to the multiple virtual synchronous generators and the frequency is regulated according to the capacities of the multiple virtual synchronous generators.

[0053] If the island microgrid is currently in the primary frequency regulation stage, active power and frequency regulation can be allocated to multiple VSGs according to their capacities. That is, the parameters related to active power and frequency regulation in multiple VSGs are adjusted according to their capacities, so that VSGs with large capacity are allocated more active power and VSGs with small capacity are allocated less active power, thereby jointly realizing frequency support of the island microgrid, suppressing frequency oscillation problems during the frequency support process, and improving the frequency stability of the island microgrid.

[0054] In a specific implementation, two virtual synchronous generators with different capacities may be determined from all VSGs according to a preset rule (such as sorting by capacity, random, etc.) as the first target generator and the second target generator.

[0055] The ratio between the apparent power S1 of the first target generator and the apparent power S2 of the second target generator is calculated as the proportional coefficient T, that is, S1 / S2 =T.

[0056] The rated value P of the second target generator on active power ref2 The product of the proportional coefficient T is assigned to the rated value P of the first target generator on active power. ref1 , that is, P ref1 =TP ref2 .

[0057] The droop coefficient K of the active power of the second target generator in the virtual speed regulator link to the frequency regulation p2 The product of the proportional coefficient T is assigned to the droop coefficient K of the active power to frequency regulation of the first target generator in the virtual speed regulator link. p1 , that is, K p1 =TK p2 .

[0058] The product of the rotational inertia J2 of the second target generator and the proportional coefficient T is assigned to the rotational inertia J1 of the first target generator, that is, J1 = TJ2.

[0059] The product of the damping coefficient D2 of the second target generator and the proportional coefficient T is assigned to the damping coefficient D1 of the first target generator, that is, D1 = TD2.

[0060] In this embodiment, a dual-VSG parallel model is constructed in the Matlab / Simulink simulation environment for simulation, and the active power distribution and frequency support verification of the island microgrid in the primary frequency regulation stage are analyzed.

[0061] From 0 to 0.6s, load 1 with an active power of 12000W is put into operation. At 0.6s, load 2 with an active power of 3600W is put into operation. At 1.0s, load 2 is removed and load 1 remains.

[0062] The simulation results are as follows Figure 2 The VSG active power distribution curve shown and Figure 3 The frequency variation curve is shown.

[0063] During the primary frequency regulation phase of the island microgrid, the method of this embodiment can be applied to make the ratio of the additional active power generated by the parallel VSG1 and VSG2 the same as the ratio of their own capacity. Each parallel VSG can allocate active power according to its capacity, and jointly realize the frequency support of the island microgrid.

[0064] Step 104: If the frequency regulation stage is the secondary frequency regulation stage, the load disturbance mode of the island microgrid is detected according to the active power of the multiple virtual synchronous generators.

[0065] If the island microgrid is currently in the secondary frequency regulation stage, the load disturbance mode of the island microgrid can be detected based on the active power of multiple virtual synchronous generators, where the load disturbance mode is used to describe the disturbance state of the load in the island microgrid.

[0066] In the specific implementation, multiple active powers are collected from the isolated island microgrid as power groups.

[0067] For the active power of non-first island microgrid in the power group, the absolute value of the difference between the active power of the current island microgrid and the active power of the previous island microgrid is taken to obtain the power fluctuation value.

[0068] Generally, the number of active powers in the power group is an even number 2δ+2, and the number of power fluctuation values ​​is an odd number 2δ+1, where δ is the step value.

[0069] For example, for the kth active power P in the island microgrid k and the k-1th active power P k-1 , the kth power fluctuation value B k Can be expressed as B k =|P k -P k-1 |, K is a positive integer.

[0070] Calculate the standard deviation std(B k-δ ,…,B k-1 ,B k ,B k+1 ,…,B k+δ ) and the mean value mean(B k-δ ,…,B k-1 ,B k ,B k+1 ,…,B k+δ ).

[0071] Determine the power fluctuation value B at the center k Is it greater than or equal to the preset first load disturbance modal identification threshold F set , that is, B k ≥F set , and, determine the standard deviation std(B k-δ ,…,B k-1 ,B k ,B k+1 ,…,B k+δ ) and the average value mean(B k-δ ,…,B k-1 ,B k ,B k+1 ,…,B k+δ ) is greater than or equal to the preset second load disturbance modal identification threshold B set , that is, std(B k-δ ,…,B k-1 ,B k ,B k+1 ,…,B k+δ ) / mean(B k-δ ,…,B k-1 ,B k ,B k+1 ,…,B k+δ )≥B set .

[0072] If the power fluctuation value at the center position is greater than or equal to a preset first load disturbance modal identification threshold, and the ratio of the standard deviation of multiple power fluctuation values ​​to the average value of multiple power fluctuation values ​​is greater than or equal to a preset second load disturbance modal identification threshold, then the load disturbance mode of the island microgrid is determined to be a step change mode.

[0073] If the power fluctuation value at the center position is less than the preset first load disturbance modal identification threshold, and / or the ratio of the standard deviation of multiple power fluctuation values ​​to the average value of multiple power fluctuation values ​​is less than the preset second load disturbance modal identification threshold, then the load disturbance mode of the island microgrid is determined to be a dynamic slowly changing mode.

[0074] Step 105 : Allocate active power and regulate frequency to the multiple virtual synchronous generators according to the load disturbance mode of the isolated island microgrid and the capacities of the multiple virtual synchronous generators.

[0075] In this embodiment, parameters related to active power and control frequency in multiple VSGs can be selected according to the load disturbance mode of the isolated microgrid, and parameters related to active power and control frequency in multiple VSGs can be adjusted according to the capacity of the multiple VSGs, so that VSGs with large capacity are allocated more active power and VSGs with small capacity are allocated less active power, thereby jointly realizing frequency support of the isolated microgrid, suppressing frequency oscillation problems in the frequency support process, and improving the frequency stability of the isolated microgrid.

[0076] In one case, if the load disturbance mode of the island microgrid is a step change mode, two virtual synchronous generators with different capacities are determined from all VSGs according to preset rules (such as sorting by capacity, random, etc.) as the first target generator and the second target generator.

[0077] The ratio between the apparent power S1 of the first target generator and the apparent power S2 of the second target generator is calculated as the proportional coefficient T, that is, S1 / S2 =T.

[0078] The rated value P of the second target generator on active power ref2 The product of the proportional coefficient T is assigned to the rated value P of the first target generator on active power. ref1 , that is, P ref1 =TP ref2 .

[0079] The droop coefficient K of the active power of the second target generator in the virtual speed regulator link to the frequency regulation p2 The product of the proportional coefficient T is assigned to the droop coefficient K of the active power to frequency regulation of the first target generator in the virtual speed regulator link. p1 , that is, K p1 =TK p2 .

[0080] The product of the rotational inertia J2 of the second target generator and the proportional coefficient T is assigned to the rotational inertia J1 of the first target generator, that is, J1 = TJ2.

[0081] The product of the damping coefficient D2 of the second target generator and the proportional coefficient T is assigned to the damping coefficient D1 of the first target generator, that is, D1 = TD2.

[0082] The coefficient k of the integrator in the second target generator is s2The product of the proportional coefficient T is assigned to the coefficient k of the integrator in the first target generator. s1 , that is, k s1 =Tk s2 , where the integrator and the damping coefficient constitute the proportional integral controller (PI control) in the control loop between active power and frequency of the virtual synchronous generator. By increasing the coefficient k of the integrator si The constraint of , realizes the function of accurately distributing the power increment according to the original output of the parallel VSG.

[0083] In this embodiment, a dual-VSG parallel model is constructed in the Matlab / Simulink simulation environment for simulation, and the active power distribution and frequency support verification of the isolated island microgrid during the load step change in the secondary frequency regulation stage are analyzed.

[0084] From 0 to 0.6s, load 1 with an active power of 12,000W is put on; at 0.6s, a step load 2 with an active power of 12,000W is put on; at 1.0s, load 2 is cut off, and load 1 remains.

[0085] The simulation results are as follows Figure 4 The VSG active power distribution curve shown and Figure 5 The frequency variation curve is shown.

[0086] When the island microgrid is in a load step change during the secondary frequency regulation stage, the method of this embodiment can be applied to make the ratio of the additional active power of the parallel VSG1 and VSG2 the same as the ratio of the initial output of the VSG. Each parallel VSG distributes power according to its own output, and jointly realizes the frequency support of the island microgrid.

[0087] In another case, if the load disturbance mode of the island microgrid is a dynamic slowly varying mode, two virtual synchronous generators with different capacities are determined as the first target generator and the second target generator.

[0088] The ratio between the apparent power S1 of the first target generator and the apparent power S2 of the second target generator is calculated as the proportional coefficient T, that is, S1 / S2 =T.

[0089] The difference between the real-time frequency of the island microgrid and the preset frequency rating is calculated to obtain the frequency deviation value Δf.

[0090] The difference between the real-time active power of the island microgrid and the preset power rating is calculated to obtain the power deviation value ΔP.

[0091] At least one of the frequency deviation value Δf and the power deviation value ΔP is compared with a preset control condition.

[0092] When the frequency deviation value Δf and / or the power deviation value ΔP meet the preset control conditions, active power and frequency control are distributed to the multiple virtual synchronous generators according to the control conditions based on the proportional coefficient T.

[0093] In the specific implementation, when considering the stability of the isolated microgrid, the damping coefficient D of the VSG is i At the upper limit D imax With the lower limit D imin The VSG's rotational inertia J fluctuates between i At the upper limit J imax and the lower limit J imin Fluctuates between.

[0094] In one control condition, if the absolute value of the frequency deviation value Δf is less than or equal to the preset frequency modulation threshold f set , that is, |Δf|≤f set , the damping coefficient of the first target generator and the rotational inertia of the first target generator are adjusted according to the first adjustment function.

[0095] The first adjustment function represents the initial value D of the damping coefficient of the first target generator. 10 , the lower limit value D of the damping coefficient of the first target generator 1min , the initial value of the rotational inertia of the first target generator J 10 The product of the proportional coefficient T and the lower limit value J of the rotational inertia of the first target generator 1min The product of the proportional coefficient T is equal to D 10 =D 1min =TJ 10 =TJ 1min .

[0096] In another control condition, if the absolute value of the frequency deviation value Δf is greater than the preset frequency modulation threshold f set , and, then the absolute value of the power deviation value ΔP is less than or equal to the preset power change threshold P on , that is, |Δf|>f set &|ΔP|≤P on , the damping coefficient of the first target generator and the rotational inertia of the first target generator are adjusted according to the second adjustment function.

[0097] The second adjustment function represents the initial value D of the damping coefficient of the first target generator. 10 and the sum of the adjustment step lengths, the product of the initial value of the rotational inertia of the first target generator plus the sum of the adjustment step lengths and the proportional coefficient, and the rotational inertia of the first target generator are equal; and the adjustment step length is the product of the frequency deviation value and the preset parameter adjustment coefficient;

[0098] In another control condition, if the absolute value of the frequency deviation value Δf is greater than the preset frequency modulation threshold f set , and the absolute value of the power deviation value ΔP is greater than the preset power change threshold P on , that is, |Δf|>f set &|ΔP|>P on , then the maximum value of the rotational inertia of the first target generator J 1max The product of the proportional coefficient T is assigned to the maximum value D of the damping coefficient of the first target generator. 1max , that is, D 1max =TJ 1max .

[0099] Furthermore, the product of the damping coefficient D2 of the second target generator and the proportional coefficient T is assigned to the damping coefficient D1 of the first target generator, ie, D1 = TD2.

[0100] The product of the rotational inertia J2 of the second target generator and the proportional coefficient T is assigned to the rotational inertia J1 of the first target generator, that is, J1 = TJ2.

[0101] Assume that the additional output fluctuation ΔP of the virtual speed regulator in the virtual synchronous generator is ti The real-time frequency f of the island microgrid minus the rated frequency f within the specified time range is ref The product k between the obtained difference and the preset output fluctuation coefficient t The integral over time t, that is, ΔP ti =∫k t (ff ref )dt.

[0102] Then, the newly added output fluctuation ΔP of the virtual speed regulator in the second target generator is t2 The product of the proportional coefficient T is assigned to the newly added output fluctuation ΔP of the virtual speed regulator in the first target generator. t1 , that is, ΔP t1 =TΔP t2 .

[0103] Furthermore, the damping coefficient D of VSG i (including the damping coefficient D1 of the first target generator and the damping coefficient D2 of the second target generator) is calculated using the adaptive adjustment method, and the rotational inertia J of the VSG i (including the rotational inertia J1 of the first target generator and the rotational inertia J2 of the second target generator) is calculated using the adaptive adjustment method, and the damping coefficient D of the VSG i (including the damping coefficient D1 of the first target generator and the damping coefficient D2 of the second target generator) and the rotational inertia J of the VSG i(including the rotational inertia J1 of the first target generator and the rotational inertia J2 of the second target generator) correspond.

[0104] In this embodiment, a dual-VSG parallel model is constructed in the Matlab / Simulink simulation environment for simulation, and the active power distribution and frequency support verification of the isolated island microgrid when the load changes slowly and dynamically in the secondary frequency regulation stage are analyzed.

[0105] From 0 to 0.6s, load 1 with an active power of 12000W is put into operation; at 0.6s, load 2 with a dynamic and slowly changing active power of 12000W is put into operation; at 1.0s, load 2 is cut off and load 1 remains.

[0106] The simulation results are as follows Figure 6 The VSG active power distribution curve shown and Figure 7 The frequency variation curve is shown.

[0107] When the load in the secondary frequency regulation stage of the isolated microgrid is changing slowly, the method of this embodiment can be applied to make the ratio of the additional active power of the parallel VSG1 and VSG2 the same as the ratio of the initial output of the VSG. Each parallel VSG distributes power according to its own output, and jointly realizes the frequency support of the isolated microgrid.

[0108] Afterwards, if the active power P of the island microgrid k Less than the preset power adjustment threshold P set , that is, P k <P set , then delay the specified time period t s1 , exit the secondary frequency modulation stage and return to step 102.

[0109] In this embodiment, multiple virtual synchronous generators are used in an island microgrid. The real-time frequency of the island microgrid is detected based on the voltage signal of the island microgrid. The frequency regulation stage of the island microgrid is set based on the real-time frequency of the island microgrid. If the frequency regulation stage is the primary frequency regulation stage, active power is allocated to the multiple virtual synchronous generators and the frequency is regulated based on the capacity of the multiple virtual synchronous generators. If the frequency regulation stage is the secondary frequency regulation stage, the load disturbance mode of the island microgrid is detected based on the active power of the multiple virtual synchronous generators. Active power is allocated to the multiple virtual synchronous generators and the frequency is regulated based on the load disturbance mode of the island microgrid and the capacity of the multiple virtual synchronous generators. This embodiment allocates active power according to the capacity of the virtual synchronous generators, suppresses oscillations during the frequency support process, and improves the frequency stability of the island microgrid.

[0110] Example 2

[0111] See also Figure 8, shows a schematic diagram of the structure of a control device for an isolated microgrid provided by the second embodiment of the present invention. The isolated microgrid uses multiple virtual synchronous generators, such as Figure 8 As shown, the device includes:

[0112] A real-time frequency detection module 801 is configured to detect the real-time frequency of the isolated island microgrid based on the voltage signal of the isolated island microgrid;

[0113] A frequency regulation stage setting module 802 is configured to set the frequency regulation stage of the island microgrid according to the real-time frequency of the island microgrid;

[0114] A primary frequency regulation module 803 is configured to allocate active power and regulate frequency to the multiple virtual synchronous generators according to their capacities if the frequency regulation stage is the primary frequency regulation stage;

[0115] A load disturbance mode detection module 804 is configured to detect a load disturbance mode of the island microgrid based on the active power of the plurality of virtual synchronous generators if the frequency regulation stage is a secondary frequency regulation stage;

[0116] The secondary frequency regulation module 805 is configured to allocate active power and regulate frequency to the plurality of virtual synchronous generators according to the load disturbance mode of the isolated island microgrid and the capacities of the plurality of virtual synchronous generators.

[0117] In one embodiment of the present invention, the frequency modulation stage setting module 802 includes:

[0118] A first frequency deviation value calculation module is used to calculate the difference between the real-time frequency of the island microgrid and a preset frequency rated value to obtain a frequency deviation value;

[0119] a primary frequency regulation setting module, configured to set the frequency regulation phase of the island microgrid to the primary frequency regulation phase if the absolute value of the frequency deviation value is less than or equal to a preset frequency regulation threshold;

[0120] The secondary frequency regulation setting module is configured to set the frequency regulation stage of the island microgrid to the secondary frequency regulation stage if the absolute value of the frequency deviation value is greater than a preset frequency regulation threshold.

[0121] In one embodiment of the present invention, the primary frequency modulation control module 803 includes:

[0122] a first generator screening module, configured to determine two virtual synchronous generators with different capacities as a first target generator and a second target generator;

[0123] a first proportionality coefficient calculation module, configured to calculate a ratio between the apparent power of the first target generator and the apparent power of the second target generator as a proportionality coefficient;

[0124] a first power rating adjustment module, configured to assign the product of the rated value of the active power of the second target generator and the proportional coefficient to the rated value of the active power of the first target generator;

[0125] a first droop coefficient adjustment module, configured to assign the product of the droop coefficient of the active power to frequency regulation of the second target generator in the virtual speed regulator link and the proportional coefficient to the droop coefficient of the active power to frequency regulation of the first target generator in the virtual speed regulator link;

[0126] a first rotational inertia adjustment module, configured to assign the product of the rotational inertia of the second target generator and the proportional coefficient to the rotational inertia of the first target generator;

[0127] The first damping coefficient adjustment module is configured to assign the product of the damping coefficient of the second target generator and the proportional coefficient to the damping coefficient of the first target generator.

[0128] In one embodiment of the present invention, the load disturbance modal detection module 804 includes:

[0129] A power group acquisition module, configured to collect multiple active powers of the isolated island microgrid as a power group;

[0130] a power fluctuation value calculation module, configured to obtain a power fluctuation value by taking an absolute value of the difference between the active power of the current island microgrid and the active power of the previous island microgrid for the active power of the non-first island microgrid in the power group;

[0131] A power fluctuation statistical value calculation module, configured to calculate a standard deviation and an average value for each of the plurality of power fluctuation values;

[0132] a step change mode determination module, configured to determine that the load disturbance mode of the island microgrid is a step change mode if the power fluctuation value at the center position is greater than or equal to a preset first load disturbance mode identification threshold, and a ratio between a standard deviation of a plurality of the power fluctuation values ​​and an average value of the plurality of the power fluctuation values ​​is greater than or equal to a preset second load disturbance mode identification threshold;

[0133] A dynamic slowly changing mode determination module is used to determine that the load disturbance mode of the island microgrid is a dynamic slowly changing mode if the power fluctuation value located at the center position is less than a preset first load disturbance mode identification threshold, and / or the ratio between the standard deviation of multiple power fluctuation values ​​and the average value of multiple power fluctuation values ​​is less than a preset second load disturbance mode identification threshold.

[0134] In one embodiment of the present invention, the secondary frequency modulation control module 805 includes:

[0135] a second generator screening module, configured to determine, if the load disturbance mode of the island microgrid is a step change mode, two virtual synchronous generators with different capacities as a first target generator and a second target generator;

[0136] a second proportionality coefficient calculation module, configured to calculate a ratio between the apparent power of the first target generator and the apparent power of the second target generator as a proportionality coefficient;

[0137] a second power rating adjustment module, configured to assign the product of the rated value of the active power of the second target generator and the proportional coefficient to the rated value of the active power of the first target generator;

[0138] a second droop coefficient adjustment module, configured to assign the product of the droop coefficient of the active power to frequency regulation of the second target generator in the virtual speed regulator link and the proportional coefficient to the droop coefficient of the active power to frequency regulation of the first target generator in the virtual speed regulator link;

[0139] a second rotational inertia adjustment module, configured to assign the product of the rotational inertia of the second target generator and the proportional coefficient to the rotational inertia of the first target generator;

[0140] a second damping coefficient adjustment module, configured to assign a product of the damping coefficient of the second target generator and the proportional coefficient to the damping coefficient of the first target generator;

[0141] an integrator coefficient adjustment module, configured to assign the product of the coefficient of the integrator in the second target generator and the proportional coefficient to the coefficient of the integrator in the first target generator; the integrator and the damping coefficient constitute a proportional-integral controller in a control loop between active power and frequency of the virtual synchronous generator.

[0142] In another embodiment of the present invention, the secondary frequency modulation control module 805 includes:

[0143] a third generator screening module, configured to determine, if the load disturbance mode of the island microgrid is a dynamic slowly changing mode, two virtual synchronous generators with different capacities as a first target generator and a second target generator;

[0144] a third proportionality coefficient calculation module, configured to calculate a ratio between the apparent power of the first target generator and the apparent power of the second target generator as a proportionality coefficient;

[0145] A second frequency deviation value calculation module is used to obtain a frequency deviation value based on the difference between the real-time frequency of the island microgrid and a preset frequency rated value;

[0146] a power deviation value calculation module, configured to obtain a power deviation value by calculating the difference between the real-time active power of the island microgrid and a preset power rating;

[0147] A conditional control module is used to distribute active power and control frequency to multiple virtual synchronous generators according to the proportional coefficient when the frequency deviation value and / or the power deviation value meet the preset control conditions.

[0148] In one embodiment of the present invention, the condition control module includes:

[0149] a first function adjustment module, configured to adjust the damping coefficient and the rotational inertia of the first target generator according to a first adjustment function if the absolute value of the frequency deviation value is less than or equal to a preset frequency regulation threshold; wherein the first adjustment function represents an initial value of the damping coefficient of the first target generator, a lower limit value of the damping coefficient of the first target generator, a product of the initial value of the rotational inertia of the first target generator and the proportional coefficient, and the product of the lower limit value of the rotational inertia of the first target generator and the proportional coefficient is equal;

[0150] a second function adjustment module, configured to adjust the damping coefficient and the rotational inertia of the first target generator according to a second adjustment function if the absolute value of the frequency deviation value is greater than a preset frequency modulation threshold value and the absolute value of the power deviation value is less than or equal to a preset power change threshold value; wherein the second adjustment function represents the sum of an initial value of the damping coefficient of the first target generator and an adjustment step size, the product of the sum of the initial value of the rotational inertia of the first target generator plus the adjustment step size and the proportional coefficient, and the rotational inertia of the first target generator is equal; and the adjustment step size is the product of the frequency deviation value and a preset parameter adjustment coefficient;

[0151] a rotational damping adjustment module, configured to assign the product of the maximum value of the rotational inertia of the first target generator and the proportional coefficient to the maximum value of the damping coefficient of the first target generator if the absolute value of the frequency deviation value is greater than a preset frequency modulation threshold and the absolute value of the power deviation value is greater than a preset power change threshold;

[0152] a third damping coefficient adjustment module, configured to assign a product of the damping coefficient of the second target generator and the proportional coefficient to the damping coefficient of the first target generator;

[0153] a third rotational inertia adjustment module, configured to assign the product of the rotational inertia of the second target generator and the proportional coefficient to the rotational inertia of the first target generator;

[0154] A new output fluctuation regulation module is added, which is used to assign the product of the new output fluctuation of the virtual speed regulator in the second target generator and the proportional coefficient to the new output fluctuation of the virtual speed regulator in the first target generator; wherein the new output fluctuation of the virtual speed regulator in the virtual synchronous generator is the time integral of the product of the difference between the real-time frequency of the island microgrid and the frequency rating within a specified time range and the preset output fluctuation coefficient.

[0155] In one embodiment of the present invention, it further comprises:

[0156] The secondary frequency regulation phase exit module is used to delay for a specified period of time if the active power of the island microgrid is less than a preset power regulation threshold, exit the secondary frequency regulation phase, and return to execute the frequency regulation phase setting module 802.

[0157] The control device of the isolated microgrid provided in the embodiment of the present invention can execute the control method of the isolated microgrid provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the control method of the isolated microgrid.

[0158] Example 3

[0159] See also Figure 9 , which shows a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, blade servers, mainframe computers, and other suitable computers. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0160] like Figure 9As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0161] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0162] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the control method for the isolated island microgrid.

[0163] In some embodiments, the control method for an islanded microgrid can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the control method for an islanded microgrid described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the control method for an islanded microgrid in any other suitable manner (e.g., via firmware).

[0164] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0165] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0166] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0167] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0168] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0169] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0170] Example 4

[0171] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the control method of the island microgrid provided by any embodiment of the present invention.

[0172] The computer program product may be implemented by writing computer program code for performing the operations of the present invention in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0173] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0174] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A control method for an island microgrid, characterized in that: The island microgrid uses multiple virtual synchronous generators, and the method includes: Detecting the real-time frequency of the isolated island microgrid according to the voltage signal of the isolated island microgrid; Setting a frequency modulation stage of the island microgrid according to the real-time frequency of the island microgrid; If the frequency regulation stage is a primary frequency regulation stage, active power is allocated to the multiple virtual synchronous generators and the frequency is regulated according to the capacities of the multiple virtual synchronous generators; If the frequency regulation stage is a secondary frequency regulation stage, detecting a load disturbance mode of the island microgrid according to the active power of the plurality of virtual synchronous generators; Active power is allocated to the multiple virtual synchronous generators and the frequency is regulated according to the load disturbance mode of the isolated island microgrid and the capacity of the multiple virtual synchronous generators.

2. The method according to claim 1, characterized in that The frequency regulation stage of the isolated island microgrid is set according to the real-time frequency of the isolated island microgrid, comprising: Calculating the difference between the real-time frequency of the island microgrid and a preset frequency rating to obtain a frequency deviation value; If the absolute value of the frequency deviation value is less than or equal to the preset frequency regulation threshold, the frequency regulation stage of the island microgrid is set to the primary frequency regulation stage; If the absolute value of the frequency deviation value is greater than a preset frequency regulation threshold, the frequency regulation stage of the island microgrid is set to the secondary frequency regulation stage.

3. The method according to claim 1, characterized in that The allocating active power and regulating frequency to the plurality of virtual synchronous generators according to the capacities of the plurality of virtual synchronous generators includes: Determining two virtual synchronous generators with different capacities as a first target generator and a second target generator; calculating a ratio between the apparent power of the first target generator and the apparent power of the second target generator as a proportionality coefficient; assigning the product of the rated value of the active power of the second target generator and the proportional coefficient to the rated value of the active power of the first target generator; Assigning the product of the droop coefficient of the active power to frequency regulation of the second target generator in the virtual speed regulator link and the proportional coefficient to the droop coefficient of the active power to frequency regulation of the first target generator in the virtual speed regulator link; assigning the product of the rotational inertia of the second target generator and the proportional coefficient to the rotational inertia of the first target generator; The product of the damping coefficient of the second target generator and the proportional coefficient is assigned to the damping coefficient of the first target generator.

4. The method according to claim 1, wherein The detecting of the load disturbance mode of the island microgrid based on the active power of the plurality of virtual synchronous generators includes: Collecting multiple active powers of the isolated island microgrid as a power group; For the active power of the non-first island microgrid in the power group, take the absolute value of the difference between the active power of the current island microgrid and the active power of the previous island microgrid to obtain a power fluctuation value; Calculating a standard deviation and an average value for each of the plurality of power fluctuation values; If the power fluctuation value at the center position is greater than or equal to a preset first load disturbance modal identification threshold, and the ratio of a standard deviation of a plurality of the power fluctuation values ​​to an average value of a plurality of the power fluctuation values ​​is greater than or equal to a preset second load disturbance modal identification threshold, then it is determined that the load disturbance mode of the island microgrid is a step change mode; If the power fluctuation value at the center position is less than a preset first load disturbance modal identification threshold, and / or the ratio between the standard deviation of multiple power fluctuation values ​​and the average value of multiple power fluctuation values ​​is less than a preset second load disturbance modal identification threshold, then it is determined that the load disturbance mode of the island microgrid is a dynamic slowly changing mode.

5. The method according to claim 4, characterized in that The allocating active power and regulating frequency to the plurality of virtual synchronous generators according to the load disturbance mode of the isolated island microgrid and the capacity of the plurality of virtual synchronous generators includes: If the load disturbance mode of the island microgrid is a step change mode, determining two virtual synchronous generators with different capacities as a first target generator and a second target generator; calculating a ratio between the apparent power of the first target generator and the apparent power of the second target generator as a proportionality coefficient; assigning the product of the rated value of the active power of the second target generator and the proportional coefficient to the rated value of the active power of the first target generator; Assigning the product of the droop coefficient of the active power to frequency regulation of the second target generator in the virtual speed regulator link and the proportional coefficient to the droop coefficient of the active power to frequency regulation of the first target generator in the virtual speed regulator link; assigning the product of the rotational inertia of the second target generator and the proportional coefficient to the rotational inertia of the first target generator; assigning the product of the damping coefficient of the second target generator and the proportional coefficient to the damping coefficient of the first target generator; The product of the coefficient of the integrator in the second target generator and the proportional coefficient is assigned to the coefficient of the integrator in the first target generator; the integrator and the damping coefficient constitute a proportional-integral controller in the control loop between active power and frequency of the virtual synchronous generator.

6. The method according to claim 4, characterized in that The allocating active power and regulating frequency to the plurality of virtual synchronous generators according to the load disturbance mode of the isolated island microgrid and the capacity of the plurality of virtual synchronous generators includes: If the load disturbance mode of the island microgrid is a dynamic slowly changing mode, two virtual synchronous generators with different capacities are determined as a first target generator and a second target generator; calculating a ratio between the apparent power of the first target generator and the apparent power of the second target generator as a proportionality coefficient; Obtaining a frequency deviation value based on the difference between the real-time frequency of the island microgrid and a preset frequency rating; Obtaining a power deviation value based on the difference between the real-time active power of the island microgrid and a preset power rating; When the frequency deviation value and / or the power deviation value meets a preset control condition, active power and frequency control are distributed to the plurality of virtual synchronous generators according to the proportional coefficient.

7. The method according to claim 6, characterized in that When the frequency deviation value and / or the power deviation value meets a preset control condition, allocating active power and regulating frequency to the plurality of virtual synchronous generators according to the proportional coefficient includes: If the absolute value of the frequency deviation value is less than or equal to a preset frequency regulation threshold, adjusting the damping coefficient and the rotational inertia of the first target generator according to a first regulation function; wherein the first regulation function represents an initial value of the damping coefficient of the first target generator, a lower limit value of the damping coefficient of the first target generator, a product of the initial value of the rotational inertia of the first target generator and the proportional coefficient, and the product of the lower limit value of the rotational inertia of the first target generator and the proportional coefficient is equal; If the absolute value of the frequency deviation value is greater than a preset frequency modulation threshold, and the absolute value of the power deviation value is less than or equal to a preset power change threshold, the damping coefficient and the rotational inertia of the first target generator are adjusted according to a second adjustment function; wherein the second adjustment function represents the sum of an initial value of the damping coefficient of the first target generator and an adjustment step size, the product of the sum of the initial value of the rotational inertia of the first target generator plus the adjustment step size and the proportional coefficient, and the rotational inertia of the first target generator is equal; the adjustment step size is the product of the frequency deviation value and a preset parameter adjustment coefficient; If the absolute value of the frequency deviation value is greater than a preset frequency modulation threshold, and the absolute value of the power deviation value is greater than a preset power change threshold, assigning the product of the maximum value of the rotational inertia of the first target generator and the proportional coefficient to the maximum value of the damping coefficient of the first target generator; assigning the product of the damping coefficient of the second target generator and the proportional coefficient to the damping coefficient of the first target generator; assigning the product of the rotational inertia of the second target generator and the proportional coefficient to the rotational inertia of the first target generator; The product of the newly added output fluctuation of the virtual speed regulator in the second target generator and the proportional coefficient is assigned to the newly added output fluctuation of the virtual speed regulator in the first target generator; wherein the newly added output fluctuation of the virtual speed regulator in the virtual synchronous generator is the time integral of the product of the difference obtained by subtracting the frequency rated value from the real-time frequency of the island microgrid within a specified time range and the preset output fluctuation coefficient.

8. The method according to any one of claims 1 to 7, characterized in that Also includes: If the active power of the island microgrid is less than the preset power regulation threshold, the specified time period is delayed, the secondary frequency regulation stage is exited, and the frequency regulation stage of setting the island microgrid according to the real-time frequency of the island microgrid is returned to.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so as to enable the at least one processor to perform the control method of the island microgrid according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the control method of the island microgrid according to any one of claims 1 to 8 is implemented.

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