A control method for power grid inertia simulation and a power grid simulation device

Abstract

The application provides a control method for realizing power grid inertia simulation by a power grid simulation device and the power grid simulation device. The power grid simulation device comprises a converter and a controller. The control method is applied to the controller. The control method comprises the following steps: receiving test characteristic information set by a user, wherein the test characteristic information at least comprises an inertia time constant and an equivalent damping coefficient of a power grid; collecting an output voltage and an output current of an output port of the converter; determining active power and reactive power according to the output voltage and the output current; determining a voltage reference value and a frequency reference value by using a power grid inertia simulation algorithm according to the test characteristic information, the active power and the reactive power; and controlling an output voltage value of the converter by using a regulator according to the voltage reference value and the frequency reference value. The control method provided by the application enables the power grid simulation device to realize the function of simulating different power grid inertias.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy grid-connected test technology, and particularly relates to a control method for realizing grid inertia simulation by a grid simulation device and the grid simulation device. BACKGROUND

[0002] The traditional power system takes large synchronous generators as the main power source. Because the rotor in the synchronous motor can store kinetic energy, the power grid has a large inertia, which can effectively cope with the frequency fluctuation caused by faults and load mutations. With the increasing proportion of new energy in the power system and the large-scale grid connection of power electronic devices, although power electronic devices have the advantages of high response speed and high control accuracy, they lack energy storage components, which leads to a decrease in the inertia of the power grid and makes the frequency and voltage instability problems more and more serious.

[0003] In order to improve the inertia of the power grid, the inertia response and primary frequency modulation function requirements are added in the new energy grid connection standard. However, the grid simulation device used for new energy grid connection test only has a simple frequency modulation function and does not have a grid inertia simulation function, which cannot reflect the actual power grid "active power-frequency" linkage change and is not conducive to the research on the stability of grid-connected devices in the synchronous inertia power grid environment. SUMMARY

[0004] The present application provides a control method for realizing grid inertia simulation by a grid simulation device and the grid simulation device, so as to realize the function of simulating different grid inertia of the grid simulation device.

[0005] According to a first aspect of the embodiment of the present application, a control method for realizing grid inertia simulation by a grid simulation device is provided, the grid simulation device comprises a converter and a controller, the control method is applied to the controller, and the control method comprises the following steps.

[0006] Receiving test characteristic information set by a user, the test characteristic information at least comprising an inertia time constant and an equivalent damping coefficient of the power grid;

[0007] Collecting output voltage and output current of an output port of the converter;

[0008] Determining active power and reactive power according to the output voltage and the output current;

[0009] Determining voltage reference value and frequency reference value by using a grid inertia simulation algorithm according to the test characteristic information, the active power and the reactive power;

[0010] Controlling the output voltage value of the converter by using a regulator according to the voltage reference value and the frequency reference value.

[0011] In a possible implementation manner, the test characteristic information further comprises:

[0012] The rated capacity, rated voltage and rated frequency of the power grid, the reactive voltage droop coefficient and the reactive control integral coefficient, and the active power shortage and the reactive power shortage.

[0013] In a possible implementation, according to the test characteristic information, the active power and the reactive power, the voltage reference value and the frequency reference value are determined by using a power grid inertia simulation algorithm, including:

[0014] According to the inertia time constant, the equivalent damping coefficient, the active power and the reactive power, the rated capacity and the rated frequency of the power grid, the reactive voltage droop coefficient and the reactive control integral coefficient, and the active power shortage and the reactive power shortage, the output voltage amplitude deviation value and the output frequency deviation value are calculated by using the power grid inertia simulation algorithm.

[0015] The rated voltage is added to the output voltage amplitude deviation value to obtain the voltage reference value.

[0016] The rated frequency is added to the output frequency deviation value to obtain the frequency reference value.

[0017] In a possible implementation, according to the inertia time constant, the equivalent damping coefficient, the active power and the reactive power, the rated capacity and the rated frequency of the power grid, the reactive voltage droop coefficient and the reactive control integral coefficient, and the active power shortage and the reactive power shortage, the output voltage amplitude deviation value and the output frequency deviation value are calculated by using the power grid inertia simulation algorithm, including:

[0018] The output voltage amplitude deviation value is calculated by using the following formula:

[0019]

[0020] Wherein, ΔV represents the output voltage amplitude deviation value, K u represents the reactive voltage droop coefficient, K q represents the reactive control integral coefficient, represents the integral, Q out represents the reactive power, Q Lack represents the reactive power shortage.

[0021] The output frequency deviation value is calculated by using the following formula:

[0022]

[0023] Wherein, Δf represents the output frequency deviation value, T J represents the inertia time constant, K ω represents the equivalent damping coefficient, f set represents the rated frequency, P out represents the active power, P N represents the rated capacity, P Lackactive power shortage.

[0024] In a possible implementation, the closed-loop regulator comprises a voltage outer-loop regulator and a current inner-loop regulator; the regulator is configured to control the output voltage of the converter according to the voltage reference value and the frequency reference value, including:

[0025] The voltage outer-loop regulator is configured to generate an output current reference value, with the output voltage reference value as a given value and the output voltage as a feedback value;

[0026] The current inner-loop regulator is configured to generate an output action, with the output current reference value as a given value and the output current as a feedback value;

[0027] The output action is superimposed with a decoupling component to generate a modulation reference value;

[0028] The modulation reference value is subjected to PWM modulation to generate a switching control value, and the switching control value controls the output voltage of the converter.

[0029] In a possible implementation, the voltage outer-loop regulator and the current inner-loop regulator are both PIR regulators.

[0030] According to a second aspect of the embodiment of the present application, a power grid simulation device is provided, which comprises a converter and a controller;

[0031] The controller is configured to receive test characteristic information set by a user, the test characteristic information at least comprising an inertia time constant and an equivalent damping coefficient of the power grid;

[0032] The controller is further configured to collect an output voltage and an output current of an output port of the converter;

[0033] The controller is further configured to determine active power and reactive power according to the output voltage and the output current;

[0034] The controller is further configured to determine a voltage reference value and a frequency reference value according to the test characteristic information, the active power and the reactive power, by using a power grid inertia simulation algorithm;

[0035] The controller is further configured to control the output voltage of the converter according to the voltage reference value and the frequency reference value, by using a regulator.

[0036] In a possible implementation, the test characteristic information further comprises:

[0037] The rated capacity, the rated voltage, the rated frequency, the reactive voltage droop coefficient, the reactive control integral coefficient, the active power shortage and the reactive power shortage of the power grid.

[0038] In a possible implementation, the controller is specifically configured to:

[0039] According to the inertia time constant, the equivalent damping coefficient, the active power, the reactive power, the rated capacity and the rated frequency of the power grid, the reactive voltage droop coefficient and the reactive control integral coefficient, and the active power shortage and the reactive power shortage, the output voltage amplitude deviation value and the output frequency deviation value are calculated by using a power grid inertia simulation algorithm;

[0040] The rated voltage is added to the output voltage amplitude deviation value to obtain a voltage reference value.

[0041] The rated frequency is added to the output frequency deviation value to obtain a frequency reference value.

[0042] In a possible implementation, the controller is specifically configured to:

[0043] The output voltage amplitude deviation value is calculated by using the following formula:

[0044]

[0045] wherein, ΔV represents the output voltage amplitude deviation value, K u represents the reactive voltage droop coefficient, K q represents the reactive control integral coefficient, represents integration, Q out represents the reactive power, Q Lack represents the reactive power shortage

[0046] The output frequency deviation value is calculated by using the following formula:

[0047]

[0048] wherein, Δf represents the output frequency deviation value, T J represents the inertia time constant, K ω represents the equivalent damping coefficient, f set represents the rated frequency, P out represents the active power, P N represents the rated power, P Lack represents the active power shortage.

[0049] The embodiment of the application provides a control method for realizing power grid inertia simulation of a power grid simulation device and the power grid simulation device, inertia time constant and equivalent damping coefficient of the power grid simulation device can be freely set by a user, and a power grid inertia simulation algorithm calculation link is added to simulate power grids with different inertia, when output power of a measured device changes, the output frequency of the power grid simulation device is adjusted according to the set inertia time constant and equivalent damping coefficient, so as to realize the power grid inertia simulation function of the power grid simulation device, realize adaptive testing of the power grid inertia of the measured device, and help to further develop power grid stability research. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art based on the accompanying drawings without creative effort should be within the protection scope of the present application.

[0051] Figure 1 A control structure diagram for realizing power grid inertia simulation of the power grid simulation device provided by the embodiment of the present application is shown in the figure.

[0052] Figure 2 A control method flow diagram for realizing power grid inertia simulation of the power grid simulation device provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should be within the protection scope of the present application.

[0054] Embodiment one

[0055] The embodiment of the present application provides a power grid simulation device, which comprises a converter and a controller. The control structure for realizing power grid inertia simulation of the power grid simulation device is shown in the figure. Figure 1 The input port of the converter is connected with an external power source, which can be a power grid. The output port of the converter is connected with a device under test. The control structure of the controller at least comprises a power calculation unit, a power grid inertia simulation calculation unit and a regulator.

[0056] Based on the above-mentioned power grid simulation device, the embodiment of the present application further provides a control method for realizing power grid inertia simulation of the power grid simulation device, as shown in the figure. Figure 2 The control method can comprise the following steps:

[0057] S210, receiving test characteristic information set by a user, the test characteristic information at least comprising an inertia time constant and an equivalent damping coefficient of the power grid.

[0058] The test characteristic information represents parameters used in the test, including parameters of the power grid and other test setting parameters.

[0059] The parameters of the power grid at least comprise the inertia time constant and the equivalent damping coefficient of the power grid.

[0060] Before the test, the tester sets the test characteristic information of the controller based on the test requirements, and the controller receives the setting of the user.

[0061] S220, the output voltage and the output current of the output port of the converter are collected.

[0062] The tester starts the grid-connected test, and the controller collects the output voltage and the output current of the output port of the converter in real time.

[0063] S230, the active power and the reactive power are determined according to the output voltage and the output current.

[0064] As shown in Figure 1 , the power calculation unit of the controller performs power calculation according to the output voltage V out and the output current I out , and obtains the active power P out and the reactive power Q out .

[0065] S240, the voltage reference value and the frequency reference value are determined according to the test characteristic information, the active power and the reactive power, and the grid inertia simulation algorithm.

[0066] The grid inertia simulation calculation unit of the controller determines the voltage reference value and the frequency reference value according to the test characteristic information, the active power and the reactive power, and the grid inertia simulation algorithm, and calculates the output frequency deviation value caused by the current output active power and the output voltage amplitude deviation value caused by the current output reactive power in real time, and determines the voltage reference value and the frequency reference value in combination with the rated voltage and the rated frequency of the grid in the test characteristic information.

[0067] S240, the output voltage value of the converter is controlled by the regulator according to the voltage reference value and the frequency reference value.

[0068] The regulator of the controller is a closed-loop regulator, including a voltage outer loop regulator and a current inner loop regulator.

[0069] The voltage outer loop regulator is used to generate an output current reference value with the output voltage reference value as the given value and the output voltage as the feedback value; then the current inner loop regulator is used to generate an output action value with the output current reference value as the given value and the output current as the feedback value; the output action value is superimposed with a decoupling component to generate a modulation reference value; the switching control value is generated after the modulation reference value is modulated by PWM, and the switching control value is used to control the output voltage of the converter, and the converter generates the output voltage based on the switching control value.

[0070] In one embodiment, the voltage outer loop regulator and the current inner loop regulator are both PIR regulators. The PIR regulator is used to control the positive and negative sequence currents without error, so as to realize accurate control of the positive and negative sequence currents.

[0071] The embodiment of the present application provides a control method for realizing power grid inertia simulation of a power grid simulation device and the power grid simulation device, inertia time constant and equivalent damping coefficient of the power grid simulation device can be freely set by a user, and a power grid inertia simulation algorithm calculation link is added to simulate power grids with different inertia, when output power of a measured device changes, output frequency of the power grid simulation device is adjusted according to the set inertia time constant and equivalent damping coefficient to adjust output voltage frequency, thereby realizing the power grid inertia simulation function of the power grid simulation device, realizing adaptive testing of power grid inertia of the measured device, and helping to further develop power grid stability research.

[0072] Embodiment two

[0073] In some embodiments, in addition to the inertia time constant and the equivalent damping coefficient of the power grid, the test characteristic information can also include rated capacity, rated voltage, rated frequency, reactive voltage droop coefficient and reactive control integral coefficient of the power grid, and other test setting parameters such as active power shortage and reactive power shortage. S240: according to the test characteristic information, the active power and the reactive power, adopting the power grid inertia simulation algorithm to determine the voltage reference value and the frequency reference value, can include the following steps:

[0074] S241, according to the inertia time constant, the equivalent damping coefficient, the active power, the reactive power, the rated capacity and the rated frequency of the power grid, the reactive voltage droop coefficient and the reactive control integral coefficient, and the active power shortage and the reactive power shortage, adopting the power grid inertia simulation algorithm to calculate, to obtain the output voltage amplitude deviation value and the output frequency deviation value.

[0075] In one embodiment, the power grid inertia simulation calculation unit of the controller adopts the following formula to calculate the output voltage amplitude deviation value:

[0076]

[0077] Wherein, ΔV represents the output voltage amplitude deviation value, K u represents the reactive voltage droop coefficient, K q represents the reactive control integral coefficient, represents integration, Q out represents the reactive power, Q Lack represents the reactive power shortage.

[0078] The power grid inertia simulation calculation unit of the controller adopts the following formula to calculate the output frequency deviation value:

[0079]

[0080] Wherein, Δf represents the output frequency deviation value, T J represents the inertia time constant, K ωrepresents equivalent damping coefficient, f set represents rated frequency, P out represents active power, P N represents rated capacity, P Lack represents active power shortage.

[0081] S242, the rated voltage is added to the output voltage amplitude deviation value to obtain a voltage reference value.

[0082] As shown in Figure 1 As shown in Figure 1 The controller adds the rated voltage V set to the output voltage amplitude deviation value AV to obtain a voltage reference value V ref , and inputs V ref to the regulator.

[0083] S243, the rated frequency is added to the output frequency deviation value to obtain a frequency reference value.

[0084] As shown in Figure 1 The controller adds the rated frequency f set to the output frequency deviation value Af to obtain a frequency reference value f ref , and inputs f ref to the regulator.

[0085] In the control method provided by the embodiment of the application, the controller uses grid inertia simulation algorithm calculation to simulate the grid characteristics of the synchronous motor, and the test personnel can freely set the active power shortage and the reactive power shortage, so that the grid simulation device can simulate the frequency response of the grid and the device under test when the active power shortage and the reactive power shortage of the grid change.

[0086] Embodiment three

[0087] The embodiment of the application also provides a computer program product, which comprises computer program instructions, and the instructions in the computer program product are executed by a processor of an electronic device to enable the electronic device to perform the steps in the control method for realizing grid inertia simulation of the grid simulation device in various embodiments of the application described in the specification.

[0088] The computer program product can be written in any combination of one or more programming languages to perform the operations of the embodiments of the application, and the programming languages include object-oriented programming languages such as Java, C++, and conventional procedural programming languages such as 'C' language or similar programming languages. The program code can be completely executed on a user computing device, partially executed on a user device, executed as an independent software package, partially executed on a user computing device and partially executed on a remote computing device, or completely executed on a remote computing device or server.

[0089] For each method embodiment described above, for the sake of simplicity, the method embodiments are described as a series of acts. But those skilled in the art will appreciate that the method embodiments are not limited by the order of acts, as some steps could occur in other orders or concurrently with each other. Moreover, those skilled in the art will appreciate that described acts could be implemented other ways, such as at least partially in hardware, and that the disclosure is not limited to the described or illustrated order or grouping of acts.

[0090] It is noted that each of the embodiments described in the specification illustrates aspects of the application and that the embodiments can be implemented with or without the each of the features that are described but any single implementation of the application can include a sub-combination of these features and that specific embodiments of the application can utilize only the exact combination of features when the specification states that a feature "may" be included in the application. Thus, features of one embodiment are not required in all embodiments.

[0091] The steps in the method embodiments of the present application can be adjusted in sequence, combined and reduced according to actual needs. The technical features recorded in the embodiments can be replaced or combined.

[0092] The units in the device and terminal of each embodiment of the present application can be combined, divided and reduced according to actual needs.

[0093] In several embodiments of the present application, it should be understood that the disclosed terminal, device and method can be implemented in other ways. For example, the terminal embodiments described above are only schematic, for example, the division of units is only a logical function division, and actual implementation can have another division manner, for example, the units can be combined or integrated into another unit, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or module, and can be electrical, mechanical or other forms.

[0094] The modules or sub-modules described as separate components can or can not be physically separate, and the components as units can or can not be physical modules or sub-modules, that is, they can be located in one place or distributed to multiple network modules or sub-modules. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0095] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0096] Those skilled in the art will further appreciate that the units and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various examples have been described herein in terms of their functionality, which has been described generally and symbolically in flow charts. Having thus described the functionality of the examples in terms of a process, it is appreciated that this functionality can be implemented by one or more types of electrical circuits, computer instructions, or a combination of both. For example, a general purpose computer can be programmed to perform the described functionality by one or more computer program instructions. The computer program instructions can be stored on a computer readable storage medium, such as a RAM, a ROM, a flash drive, a CD-ROM, a floppy disk, a hard disk, or a solid state drive, associated with the general purpose computer. Alternatively, the computer program instructions can be downloaded to the general purpose computer from a computer software distribution medium or a computer network. Furthermore, the general purpose computer can be programmed to perform the described functionality by one or more general purpose computers in a networked computing environment. Each general purpose computer can perform a different part or all of the described functionality.

[0097] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, hard disk can be used as a storage medium.

[0098] Finally, it should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0099] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for simulating power grid inertia using a power grid simulation device, characterized in that, The power grid simulation device includes a converter and a controller, and the control method is applied to the controller. The control method includes: Receive user-defined test feature information, which includes at least the power grid's inertial time constant, equivalent damping coefficient, rated capacity, rated voltage, rated frequency, reactive voltage droop coefficient, and reactive power control integral coefficient, as well as active power deficit and reactive power deficit. Collect the output voltage and output current at the output port of the converter; The active power and reactive power are determined based on the output voltage and the output current. Based on the test characteristic information, the active power, and the reactive power, a power grid inertia simulation algorithm is used to determine the voltage reference value and the frequency reference value. The output voltage of the converter is controlled by a regulator based on the voltage reference value and the frequency reference value. The step of determining the voltage reference value and frequency reference value using a power grid inertia simulation algorithm based on the test feature information, the active power, and the reactive power includes: Based on the inertial time constant, the equivalent damping coefficient, the active power, the reactive power, the rated capacity of the power grid and the rated frequency, the reactive voltage droop coefficient and the reactive power control integral coefficient, as well as the active power deficit and reactive power deficit, the power grid inertia simulation algorithm is used to calculate the output voltage amplitude deviation and the output frequency deviation. The voltage reference value is obtained by adding the rated voltage to the output voltage amplitude deviation value. The frequency reference value is obtained by adding the rated frequency to the output frequency deviation value.

2. The control method for simulating power grid inertia using the power grid simulation device according to claim 1, characterized in that, The output voltage amplitude deviation and output frequency deviation are calculated using a power grid inertia simulation algorithm based on the inertia time constant, the equivalent damping coefficient, the active power, the reactive power, the rated capacity and the rated frequency of the power grid, the reactive voltage droop coefficient and the reactive power control integral coefficient, as well as the active power deficit and reactive power deficit. These deviations include: The output voltage amplitude deviation is calculated using the following formula: Where ΔV represents the output voltage amplitude deviation value, K u K represents the reactive voltage droop coefficient. q This represents the reactive power control integral coefficient. Let Q represent the integral. out Q represents the reactive power. Lack This indicates the reactive power deficit; The output frequency deviation value is calculated using the following formula: Where Δf represents the output frequency deviation value, T J K represents the inertial time constant. ω f represents the equivalent damping coefficient. set P represents the rated frequency. out P represents the active power. N P represents the rated capacity. Lack This indicates the active power deficit.

3. The control method for simulating power grid inertia using the power grid simulation device according to claim 1, characterized in that, The controller's regulator is a closed-loop regulator, which includes an outer voltage regulator and an inner current regulator. The step of controlling the converter's output voltage value using the regulator based on the voltage reference value and the frequency reference value includes: Using the aforementioned voltage outer loop regulator, with the output voltage reference value as a given value and the output voltage as feedback, an output current reference value is generated. Using the aforementioned inner-loop current regulator, with the output current reference value as a given value and the output current as feedback, an output action is generated. The output action is superimposed with the decoupling component to generate a modulation reference quantity; Based on the modulation reference value, a switching control value is generated after PWM modulation, and the switching control value is the output voltage of the converter.

4. The control method for simulating power grid inertia using the power grid simulation device according to claim 3, characterized in that, The voltage outer loop regulator is a PIR regulator.

5. A power grid simulation device, characterized in that, The power grid simulation device includes a converter and a controller; The controller is used to receive test feature information set by the user. The test feature information includes at least the inertial time constant, equivalent damping coefficient, rated capacity, rated voltage and rated frequency of the power grid, reactive voltage droop coefficient and reactive power control integral coefficient, as well as active power deficit and reactive power deficit. It is also used to collect the output voltage and output current of the converter's output port; It is also used to determine active power and reactive power based on the output voltage and the output current; It is also used to determine voltage reference values ​​and frequency reference values ​​based on the test feature information, the active power and the reactive power, using a power grid inertia simulation algorithm; It is also used to control the output voltage value of the converter using a regulator based on the voltage reference value and the frequency reference value; Specifically, the controller is used for: Based on the inertial time constant, the equivalent damping coefficient, the active power, the reactive power, the rated capacity and rated frequency of the power grid, the reactive voltage droop coefficient and the reactive power control integral coefficient, as well as the active power deficit and reactive power deficit, the power grid inertia simulation algorithm is used to calculate the output voltage amplitude deviation and output frequency deviation. The voltage reference value is obtained by adding the rated voltage to the output voltage amplitude deviation value. The frequency reference value is obtained by adding the rated frequency to the output frequency deviation value.

6. The power grid simulation device according to claim 5, characterized in that, The controller is specifically used for: The output voltage amplitude deviation is calculated using the following formula: Where ΔV represents the output voltage amplitude deviation value, K u K represents the reactive voltage droop coefficient. q This represents the reactive power control integral coefficient. Let Q represent the integral. out Q represents the reactive power. Lack This indicates the reactive power deficit; The output frequency deviation value is calculated using the following formula: Where Δf represents the output frequency deviation value, T J K represents the inertial time constant. ω f represents the equivalent damping coefficient. set P represents the rated frequency. out P represents the active power. N P represents the rated capacity. Lack This indicates the active power deficit.

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