CN117175549A - Method and system for analyzing frequency response of micro-grid with grid-structured converter access - Google Patents
Method and system for analyzing frequency response of micro-grid with grid-structured converter access Download PDFInfo
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Abstract
The application relates to a frequency response analysis method and a frequency response analysis system for a micro-grid accessed by a constructed network type converter, comprising the following steps: acquiring related parameters of a micro-grid accessed by a grid-structured converter; inputting the obtained related parameters into a pre-constructed equivalent frequency response model, and carrying out equivalent frequency response analysis on the micro-grid accessed by the grid-structured converter. When the equivalent frequency response model is constructed, an equivalent two-machine system model is established by determining a power-frequency-power angle frequency domain expression of the grid-structured converter connected with the micro-grid, and aggregation, order reduction, decoupling and simplification are further carried out, so that the construction of the equivalent frequency response model of the grid-structured converter connected with the micro-grid is completed. Therefore, the method can be widely applied to the field of dynamic frequency analysis of the power grid.
Description
Technical Field
The application relates to a micro-grid frequency response analysis method and system, in particular to an equivalent frequency response analysis method and system for a micro-grid accessed by a grid-structured converter, and belongs to the field of dynamic frequency analysis of the grid.
Background
In order to reduce carbon emission and power generation cost, the micro-grid gradually increases the access capacity of a new energy power supply, and reduces the power generation duty ratio of the thermal power generating unit. However, the micro-grid has limited power generation capacity and is often operated in an island state, and after a new energy power supply is connected, the frequency of the micro-grid is easy to change greatly within a few seconds due to transient faults and new energy output fluctuation. As the thermal power generating unit gradually exits, the inertia and primary frequency modulation capacity of the system are further reduced, and the problem of frequency stability is outstanding.
Research shows that a grid-forming (GFM) control strategy has stronger frequency support capability in a high-new energy permeability scene than a grid-forming (GFL) control strategy. Therefore, it is necessary to study the frequency stability characteristics of the grid-structured converter connected to the offshore oilfield group power grid, and support and guidance are provided for the construction of a novel power system.
The equivalent single machine system frequency response model of the power electronic converter connected to the power grid, which is also called as an extended frequency response (extended system frequency response, ESFR) model, has simple structure and convenient solution, and can be used for modeling the equivalent frequency response of the grid-built converter connected to the micro-power grid. However, as an independent voltage source, the grid-structured converter needs to consider the problem of energy interaction with the power grid voltage source, and the direct equivalence of the grid-structured converter to a single machine model is not enough like the grid-structured control, so that the prior art still has room for improvement.
Disclosure of Invention
Aiming at the problems, the application aims to provide a frequency response analysis method and a frequency response analysis system for a micro-grid accessed by a grid-structured converter, which are used for establishing an equivalent two-machine system model by determining a power-frequency-power angle frequency domain expression of the micro-grid accessed by the grid-structured converter, further carrying out aggregation, reduction, decoupling and simplification, completing the construction of an equivalent frequency response model of the micro-grid accessed by the grid-structured converter, and carrying out dynamic frequency analysis on the micro-grid accessed by the grid-structured converter based on the equivalent frequency response model.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect, the present application provides a method for analyzing a frequency response of a micro-grid to which a grid-connected converter is connected, comprising the steps of:
acquiring related parameters of a micro-grid accessed by a grid-structured converter;
inputting the obtained related parameters into a pre-constructed equivalent frequency response model, and carrying out equivalent frequency response analysis on the micro-grid accessed by the grid-structured converter.
Further, inputting the obtained related parameters into a pre-constructed equivalent frequency corresponding model, and performing equivalent frequency response analysis on the micro-grid accessed by the grid-structured converter, wherein the method comprises the following steps:
determining a power-frequency-power angle frequency domain expression of a micro-grid accessed by a grid-structured converter under the action of disturbance power;
based on the determined power-frequency-power angle frequency domain expression, establishing an equivalent two-machine system model of the micro-grid accessed by the grid-structured converter;
performing aggregation, order reduction, decoupling and simplification on the equivalent two-machine system model to obtain a power grid frequency expression corresponding to disturbance power;
based on a grid frequency expression corresponding to disturbance power, completing the construction of an equivalent frequency response model of the micro-grid accessed by the grid-structured converter;
inputting the obtained relevant parameters into a corresponding model of equivalent frequency, and analyzing the equivalent frequency response of the micro-grid connected with the grid-structured converter.
Further, under the action of the determined disturbance power, a power-frequency-power angle frequency domain expression of a micro-grid accessed by the grid-structured converter comprises:
determining main elements related to power-frequency-power angles of a micro grid accessed by a grid-structured converter;
under the action of disturbance power, a frequency domain expression of power-frequency-power angle of the micro-grid is determined according to a synchronous generator rotor swing equation and power change of main elements.
Further, the main elements include at least: the thermal power generating unit comprises a grid-type converter control element, a load and a grid-type converter control element.
Further, the frequency domain expression of the power-frequency-power angle is:
wherein H is sys Equivalent to electric networkAn inertial time constant; d (D) sys The equivalent damping coefficient of the power grid; Δf g 、Δδ g 、Δf B 、Δδ B The variable quantity of the power grid frequency and the variable quantity of the power angle reference value and the virtual frequency of the grid-structured converter are respectively; ΔP m 、ΔP W The active power of the gas turbine prime motor-speed regulator and the following-net type converter control element in response to the change of the power grid frequency is respectively; ΔP Bg Active power injected into a power grid for a grid-structured converter control element; t (T) J 、D p The virtual inertia time constant and the virtual damping coefficient of the grid-structured converter are respectively; ΔP ref The variable quantity of the active power reference value of the network-structured converter; s is complex frequency in the frequency domain, w 0 The rated angular frequency of the power grid.
Further, the grid frequency expression corresponding to the disturbance power is:
in a second aspect, the present application provides a frequency response analysis system for a micro-grid with a grid-connected converter access, comprising:
the data acquisition module is used for acquiring related parameters of the micro-grid accessed by the grid-structured converter;
the frequency response analysis module is used for inputting the acquired related parameters into a pre-constructed equivalent frequency response model and carrying out equivalent frequency response analysis on the micro-grid accessed by the grid-structured converter.
Further, the frequency response analysis module includes:
the frequency domain expression determining module is used for determining a power-frequency-power angle frequency domain expression of the micro-grid connected with the grid-structured converter under the action of disturbance power;
the equivalent two-machine system model construction module is used for constructing an equivalent two-machine system model of the micro-grid accessed by the grid-structured converter based on the determined power-frequency-power angle frequency domain expression;
the simplification module is used for carrying out aggregation, order reduction, decoupling and simplification on the equivalent two-machine system model to obtain a power grid frequency expression corresponding to the disturbance power;
the equivalent frequency response model construction module is used for completing the equivalent frequency response model construction of the micro-grid accessed by the constructed grid type converter based on the grid frequency expression corresponding to the disturbance power;
and the analysis module is used for inputting the acquired related parameters into the equivalent frequency corresponding model and analyzing the equivalent frequency response of the micro-grid connected with the grid-structured converter.
In a third aspect, the present application provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods.
In a fourth aspect, the present application provides a computing device comprising: one or more processors, memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods.
Due to the adoption of the technical scheme, the application has the following advantages:
1. the method takes the external characteristics of the voltage source of the grid-structured converter into consideration for modeling, can effectively fit the access characteristics of the grid-structured converter, and accurately reflects the dynamic frequency response of the micro-grid accessed by the grid-structured converter.
2. The application comprehensively considers the thermal power unit, the follow-up net type element, the net-structured element and the load, and the proposed equivalent frequency response model has comprehensive consideration problem and is more suitable for micro-grids accessed by high-proportion power electronic devices.
3. The application reduces and equates the multi-machine and multi-order frequency response model, and the obtained model has simple structure and fewer orders, and is easy to calculate and solve the frequency response result rapidly.
Therefore, the method can be widely applied to the field of dynamic frequency analysis of the power grid.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Like parts are designated with like reference numerals throughout the drawings. In the drawings:
fig. 1 is a flow chart of a frequency response analysis method of a micro-grid accessed by a grid-structured converter according to an embodiment of the present application;
fig. 2 is an equivalent two-machine system model of a micro-grid accessed by a grid-structured converter according to an embodiment of the present application;
fig. 3 is an equivalent frequency response model of a micro-grid accessed by a grid-connected converter according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the application, fall within the scope of protection of the application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Aiming at the external characteristics of a voltage source of the grid-structured converter, in some embodiments of the application, a frequency response analysis method of a micro-grid accessed by the grid-structured converter is provided. Firstly, determining a power-frequency-power angle frequency domain expression of a grid-structured converter accessed to a micro-grid; secondly, establishing an equivalent two-machine system model of the grid-structured converter accessed to the micro-grid; then, the peer value model is aggregated, reduced, decoupled and simplified; thirdly, constructing an equivalent frequency response model of the grid-built converter connected with the micro-grid; and finally, carrying out dynamic frequency analysis on the access micro-grid of the grid-structured converter based on the equivalent frequency response model.
In accordance therewith, in other embodiments of the present application, a system, apparatus and medium for performing equivalent frequency response analysis on a microgrid are provided.
Example 1
As shown in fig. 1, the present embodiment provides a frequency response analysis method for a micro-grid with a grid-connected converter, which includes the following steps:
1) Acquiring related parameters of a micro-grid accessed by a grid-structured converter;
2) Inputting the obtained related parameters into a pre-constructed equivalent frequency response model, and analyzing the equivalent frequency response of the micro-grid connected with the grid-structured converter, thereby providing support and guidance for the construction of a novel power system.
Preferably, in the step 1), the micro-grid mainly refers to a transmission and distribution integrated micro-system composed of a distributed power source, energy storage, load and the like, and the transmission and distribution integrated micro-system is usually operated at a voltage level of not more than 35kV, and the transmission and distribution integrated micro-system is tightly coupled, including but not limited to an offshore oilfield group grid and the like.
Preferably, in the step 2), the method for constructing the equivalent frequency response model of the grid-connected converter connected to the micro-grid includes the following steps:
2.1 Determining a power-frequency-power angle frequency domain expression of a micro-grid accessed by a grid-structured converter under the action of disturbance power;
2.2 Based on the power-frequency-power angle frequency domain expression determined in the step 2.1), establishing an equivalent two-machine system model of the micro-grid accessed by the grid-structured converter;
2.3 The equivalent value two-machine system model is subjected to aggregation, order reduction, decoupling and simplification to obtain a power grid frequency expression corresponding to disturbance power;
2.4 Based on the power grid frequency expression corresponding to the disturbance power, completing the construction of an equivalent frequency response model of the micro-grid accessed by the grid-structured converter;
2.5 Inputting the obtained relevant parameters into a corresponding model of equivalent frequency, and analyzing the equivalent frequency response of the micro-grid connected with the grid-structured converter.
Preferably, in the step 2.1), the method includes the steps of:
2.1.1 A primary element associated with its power-frequency-power angle in a microgrid to which the grid-connected converter is connected.
In this embodiment, from the angles of energy emission and use, the main elements related to the power-frequency-power angle of the micro-grid to which the grid-connected converter is connected are divided into: thermal power generating units (mainly consider gas turbine generator sets in the modeling process of the embodiment), network-type converter control elements (new energy sources, energy storage and the like), loads and network-type converter control elements (new energy sources, energy storage and the like) are constructed.
2.1.2 Under the action of disturbance power, determining a frequency domain expression of power-frequency-power angle of a micro-grid accessed by the grid-structured converter according to a synchronous generator rotor swing equation and power change of a main element.
The electric distance of each element of the micro-grid is relatively short, and the frequency space-time distribution effect and the network structure effect can be ignored. Setting disturbance power delta P corresponding to power supply, load fluctuation or component fault d Under the action of the disturbance power, according to the synchronous generator rotor swing equation and the main element power change, determining the frequency domain expression of the power grid power-frequency-power angle as follows:
wherein H is sys The inertia time constant H of each synchronous generator of the power grid is obtained by weighted average of capacity; d (D) sys The equivalent damping coefficient of the power grid is obtained by carrying out weighted average on each load frequency modulation coefficient D of the power grid according to the capacity; Δf g 、Δδ g 、Δf B 、Δδ B The variable quantity of the power grid frequency and the variable quantity of the power angle reference value and the virtual frequency of the grid-structured converter are respectively; ΔP m 、ΔP W The active power of the gas turbine prime motor-speed regulator and the following-net type converter control element in response to the change of the power grid frequency is respectively; ΔP Bg Active power injected into the power grid for the grid-formed converter control element. The grid-built converter is considered to be controlled by a virtual synchronous machine, wherein T is J 、D p The virtual inertia time constant and the virtual damping coefficient of the grid-structured converter are respectively obtained directly by control parameters; ΔP ref The variable quantity of the active power reference value of the network-structured converter; s is complex frequency in the frequency domain, w 0 The rated angular frequency of the power grid.
In formula (1), ΔP m 、ΔP W 、ΔP ref 、ΔP Bg Are functions of the frequency variation and the power angle variation, and four variable expressions are further determined as follows:
first, ΔP m 、ΔP W Active power as a gas turbine prime mover-governor, grid-following converter control element responsive to grid frequency variation, both with Δf g The relation is:
wherein lambda is G 、λ W The total capacity of the gas turbine and the total capacity of the control element of the grid-following converter are respectively the percentage of the total capacity of the grid assembly machine; k (K) fW 、T W The frequency modulation coefficient and the frequency modulation time constant of the control element of the follow-net type converter are directly obtained by the control parameters; r is R w Is the difference adjustment coefficient of the gas turbine, X, K is equivalent parameters of the fuel control link of the gas turbine, T G The constant time constant is equivalent to the energy conversion link of the fuel machine, and B is a steady-state frequency deviation coefficient.
Let M= [ R ] w ,X,K,T G ,B]For the gas turbine prime mover-governor parameter matrix, M equates each gas turbine parameter according to equation (3) belowDetermining S i For each gas turbine capacity.
Second, the active power ΔP in response to grid frequency changes with the prime mover-governor m Similarly, deltaP ref In response to virtual frequency changes in the grid-formed converter, which is equal to Δf B The relation is:
wherein T is B For filtering time constant, K f And K v The active frequency modulation coefficient and the active inertia coefficient of the grid-structured converter are respectively obtained directly by the control parameters.
Finally, deltaP Bg As active power injected into the grid by the grid-formed converter control element, the active power transfer expression between two voltage sources can be used for calculation, namely:
wherein V is B 、V g Respectively the port voltage of the grid-structured converter and the average voltage of the micro-grid, X V Is equivalent impedance between the port of the grid-structured converter and the micro-grid. In conclusion, the determination of the power-frequency-power angle frequency domain expression of the grid-structured converter accessed to the micro-grid is completed.
Preferably, in the step 2.2), as shown in fig. 2, an equivalent two-machine system model of the grid-built converter connected to the micro-grid is established according to the relation of the formulas (1) to (5). In the figure, w 0 The rated angular frequency of the power grid is 2 pi times of the rated frequency of the power grid. For disturbance power ΔP d The disturbance application process is considered to be a step process, which then satisfies:
wherein P is d Is the ratio of the disturbance power to the rated active power of the power grid.
Preferably, in the step 2.3), in order to quickly solve the frequency response result, the equivalent two-machine system model of the grid-structured converter access micro-grid is aggregated, reduced, decoupled and simplified.
First, for DeltaP m 、ΔP W The aggregation and the reduction are carried out, and the two equations of the formula (2) are added and combined to obtain the total active power delta P of the prime motor-speed regulator of the gas turbine and the follow-up grid type converter control element in response to the change of the frequency of the power grid m ′，
Wherein according to T G 、T W The value is smaller, the multiplication terms of the two are ignored, and new equivalent parameters X ', K', T are formed G ′。
Then, since the port voltage of the grid-structured converter and the average voltage of the micro-grid are not changed greatly, it is considered that V B 、V g Are all about equal to 1, ΔP Bg Linearization can be achieved:
therefore, the approximate result of the power-frequency-power angle frequency domain expression of the grid-structured converter connected with the micro-grid is as shown in the formula (9) obtained by substituting the formulas (6), (7) and (8) into the formula (2).
Then, the simultaneous equations of the formula (9) are eliminated, and the virtual frequency delta f of the grid-connected converter is eliminated B Obtaining the disturbance power delta P d Uniquely corresponding grid frequency Δf g The expression is shown as formula (10), and the grid frequency delta f is realized g Virtual frequency delta f of network-structured converter B Decoupling from each other.
Finally, for the grid frequency Δf in equation (10) g The expression is simplified. Wherein the part connected with the negative sign reflects the power response process of the grid-constructed converter to the power grid frequency, and the power response process is further simplified by general simplification, and smaller T is ignored B s terms, can be obtained:
wherein a=w 0 /X V ，C＝T J +K v ，D＝K f +D p 。
To sum up, after the equivalent model is aggregated, reduced, decoupled and simplified, the power delta P is disturbed d Corresponding grid frequency Δf g The expression is:
preferably, in the above step 2.4), as shown in fig. 3, the disturbance power Δp is based on d Corresponding grid frequency Δf g And (3) the expression is used for completing the construction of the equivalent frequency response model of the grid-structured converter accessed into the micro-grid.
Example 2
In contrast, the embodiment 1 provides a frequency response analysis method for a micro-grid with a grid-connected converter, and the embodiment provides a frequency response analysis system for a micro-grid with a grid-connected converter. The system provided in this embodiment may implement the frequency response analysis method of the micro-grid accessed by the grid-connected converter in embodiment 1, where the system may be implemented by software, hardware, or a combination of software and hardware. For example, the system may include integrated or separate functional modules or functional units to perform the corresponding steps in the methods of embodiment 1. Since the system of this embodiment is substantially similar to the method embodiment, the description of this embodiment is relatively simple, and the relevant points may be found in part in the description of embodiment 1, which is provided by way of illustration only.
The frequency response analysis system of the micro-grid accessed by the grid-structured converter provided by the embodiment comprises:
the data acquisition module is used for acquiring related parameters of the micro-grid accessed by the grid-structured converter;
the frequency response analysis module is used for inputting the acquired related parameters into a pre-constructed equivalent frequency response model and carrying out equivalent frequency response analysis on the micro-grid accessed by the grid-structured converter.
Preferably, the frequency response analysis module includes:
the frequency domain expression determining module is used for determining a power-frequency-power angle frequency domain expression of the grid-constructed converter connected to the micro-grid under the action of disturbance power;
the equivalent two-machine system model construction module is used for constructing an equivalent two-machine system model of the grid-structured converter accessed micro-grid based on the determined power-frequency-power angle frequency domain expression;
the simplification module is used for carrying out aggregation, order reduction, decoupling and simplification on the equivalent two-machine system model to obtain a power grid frequency expression corresponding to the disturbance power;
the equivalent frequency response model construction module is used for completing the equivalent frequency response model construction of the access micro-grid of the grid-structured converter based on the grid frequency expression corresponding to the disturbance power;
and the analysis module is used for inputting the acquired related parameters into the equivalent frequency corresponding model and analyzing the equivalent frequency response of the micro-grid connected with the grid-structured converter.
Example 3
The present embodiment provides a processing device corresponding to the frequency response analysis method of a micro-grid with a grid-connected converter provided in the present embodiment 1, where the processing device may be a processing device for a client, for example, a mobile phone, a notebook computer, a tablet computer, a desktop computer, etc., so as to execute the method of embodiment 1.
The processing device comprises a processor, a memory, a communication interface and a bus, wherein the processor, the memory and the communication interface are connected through the bus so as to complete communication among each other. The memory stores a computer program that can be run on the processor, and when the processor runs the computer program, the frequency response analysis method of the micro-grid accessed by the grid-connected converter provided in the embodiment 1 is executed.
In some embodiments, the memory may be a high-speed random access memory (RAM: random Access Memory), and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
In other embodiments, the processor may be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or other general purpose processor, which is not limited herein.
Example 4
A method for analyzing a frequency response of a micro-grid with a grid-connected converter according to embodiment 1 may be embodied as a computer program product, which may include a computer readable storage medium having computer readable program instructions for executing the method for analyzing a frequency response of a micro-grid with a grid-connected converter according to embodiment 1.
The computer readable storage medium may be a tangible device that retains and stores instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the preceding.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (10)
1. A method for analyzing the frequency response of a micro-grid with a grid-connected converter access, comprising the steps of:
acquiring related parameters of a micro-grid accessed by a grid-structured converter;
inputting the obtained related parameters into a pre-constructed equivalent frequency response model, and carrying out equivalent frequency response analysis on the micro-grid accessed by the grid-structured converter.
2. The method for analyzing the frequency response of a micro-grid connected with a grid-connected converter according to claim 1, wherein the step of inputting the obtained related parameters into a pre-constructed equivalent frequency corresponding model to analyze the equivalent frequency response of the micro-grid connected with the grid-connected converter comprises the steps of:
determining a power-frequency-power angle frequency domain expression of a micro-grid accessed by a grid-structured converter under the action of disturbance power;
based on the determined power-frequency-power angle frequency domain expression, establishing an equivalent two-machine system model of the micro-grid accessed by the grid-structured converter;
performing aggregation, order reduction, decoupling and simplification on the equivalent two-machine system model to obtain a power grid frequency expression corresponding to disturbance power;
based on a grid frequency expression corresponding to disturbance power, completing the construction of an equivalent frequency response model of the micro-grid accessed by the grid-structured converter;
inputting the obtained relevant parameters into a corresponding model of equivalent frequency, and analyzing the equivalent frequency response of the micro-grid connected with the grid-structured converter.
3. A method for analyzing the frequency response of a micro-grid with a grid-connected converter as set forth in claim 2, wherein the determining the power-frequency-power-angle frequency domain expression of the micro-grid with the grid-connected converter under the disturbance power comprises:
determining main elements related to power-frequency-power angles of a micro grid accessed by a grid-structured converter;
under the action of disturbance power, a frequency domain expression of power-frequency-power angle of the micro-grid is determined according to a synchronous generator rotor swing equation and power change of main elements.
4. A method of analyzing the frequency response of a microgrid having a grid-connected converter access according to claim 3, wherein said primary elements comprise at least: the thermal power generating unit comprises a grid-type converter control element, a load and a grid-type converter control element.
5. A method of analyzing the frequency response of a microgrid having a grid-connected converter access according to claim 3, wherein the frequency domain expression of the power-frequency-power angle is:
wherein H is sys The equivalent inertia time constant of the power grid; d (D) sys The equivalent damping coefficient of the power grid; Δf g 、Δδ g 、Δf B 、Δδ B The variable quantity of the power grid frequency and the variable quantity of the power angle reference value and the virtual frequency of the grid-structured converter are respectively; ΔP m 、ΔP W The active power of the gas turbine prime motor-speed regulator and the following-net type converter control element in response to the change of the power grid frequency is respectively; ΔP Bg Active power injected into a power grid for a grid-structured converter control element; t (T) J 、D p The virtual inertia time constant and the virtual damping coefficient of the grid-structured converter are respectively; ΔP ref The variable quantity of the active power reference value of the network-structured converter; s is complex frequency in the frequency domain, w 0 The rated angular frequency of the power grid.
6. The method for analyzing the frequency response of a micro-grid with a grid-connected converter as set forth in claim 5, wherein the grid frequency expression corresponding to the disturbance power is:
7. a frequency response analysis system for a grid-connected converter-connected micro-grid, comprising:
the data acquisition module is used for acquiring related parameters of the micro-grid accessed by the grid-structured converter;
the frequency response analysis module is used for inputting the acquired related parameters into a pre-constructed equivalent frequency response model and carrying out equivalent frequency response analysis on the micro-grid accessed by the grid-structured converter.
8. A system for analyzing the frequency response of a grid-connected converter-connected microgrid according to claim 7, wherein said frequency response analysis module comprises:
the frequency domain expression determining module is used for determining a power-frequency-power angle frequency domain expression of the micro-grid connected with the grid-structured converter under the action of disturbance power;
the equivalent two-machine system model construction module is used for constructing an equivalent two-machine system model of the micro-grid accessed by the grid-structured converter based on the determined power-frequency-power angle frequency domain expression;
the simplification module is used for carrying out aggregation, order reduction, decoupling and simplification on the equivalent two-machine system model to obtain a power grid frequency expression corresponding to the disturbance power;
the equivalent frequency response model construction module is used for completing the equivalent frequency response model construction of the micro-grid accessed by the constructed grid type converter based on the grid frequency expression corresponding to the disturbance power;
and the analysis module is used for inputting the acquired related parameters into the equivalent frequency corresponding model and analyzing the equivalent frequency response of the micro-grid connected with the grid-structured converter.
9. A computer readable storage medium storing one or more programs, wherein the one or more programs comprise instructions, which when executed by a computing device, cause the computing device to perform any of the methods of claims 1-7.
10. A computing device, comprising: one or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods of claims 1-7.
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