Flexible interconnected diamond distribution network control method for high proportion of wind power consumption

Abstract

The application discloses a flexible interconnected diamond distribution network control method for high-proportion wind power consumption, which comprises the following steps: collecting wind wheel rotating speed and converter DC voltage, obtaining active power reference value of a doubly-fed wind turbine through a smooth power control module; obtaining rotor-side converter modulation voltage reference value based on the active power reference value, basic operation parameters of the doubly-fed wind turbine and rotor current feedback value to adjust the rotor-side converter; generating a phase through an integrator after proportional gain of the converter DC voltage, obtaining grid-side converter modulation voltage based on the phase and grid-side converter modulation voltage amplitude to adjust the grid-side converter. The application can dynamically adjust the maximum power tracking control curve of the doubly-fed wind turbine according to the observed converter DC voltage and wind wheel rotating speed, suppresses the fluctuation of active power output of the doubly-fed wind turbine and power grid frequency, and further improves the frequency stability of the flexible interconnected diamond distribution network and enhances the consumption capacity of the flexible interconnected diamond distribution network to high-proportion new energy.

Description

Technical Field

[0001] This invention relates to the field of flexible interconnected distribution network control technology, specifically to a flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption. Background Technology

[0002] In recent years, key equipment and technologies for flexible interconnection of distribution networks have gradually gained favor among scholars, and flexible interconnected distribution networks have gradually become a research hotspot in the field of distribution networks. A flexible interconnected distribution network is a distribution network capable of flexible closed-loop operation; its concept belongs to a subset of smart distribution networks. Its purpose is to upgrade the main system of the power grid using power electronics technology, enabling some key nodes or branches to become flexible nodes or branches with flexible closed-loop capabilities.

[0003] The "diamond-shaped" distribution network refers to the double-ring network structure currently being built in Shanghai, with a 10 kV substation as the core node, dual-side power supply, and self-healing capabilities. This model was pioneered by State Grid Shanghai Electric Power based on benchmarking against advanced distribution networks both domestically and internationally. It significantly improves power supply reliability and load transfer capacity while also taking into account the economic benefits of construction and renovation.

[0004] With the increasing integration ratio of wind power, wind power has a significant impact on the safe and stable operation of flexible interconnected diamond-shaped distribution networks. Due to the volatility and randomness of wind, the output power of wind turbines also exhibits volatility and randomness. As the proportion of wind power integrated into the flexible interconnected diamond-shaped distribution network gradually increases, the fluctuating wind power leads to more pronounced frequency fluctuations in the network, severely affecting the power system's ability to absorb high proportions of renewable energy. Therefore, it is necessary to study control methods for flexible interconnected diamond-shaped distribution networks designed for high-proportion wind power absorption, reducing the impact of fluctuating power on the network's frequency and improving its ability to absorb high proportions of wind power. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the above-mentioned problems, the present invention is proposed.

[0007] Therefore, the technical problem solved by this invention is: how to reduce the impact of fluctuating wind power on the frequency of flexible interconnected diamond distribution networks, improve frequency stability, and enhance the absorption capacity of flexible interconnected diamond distribution networks.

[0008] To address the aforementioned technical problems, this invention provides the following technical solution: a control method for a flexible interconnected diamond-shaped distribution network oriented towards high-proportion wind power consumption, comprising:

[0009] The wind turbine speed and converter DC voltage are collected, and the smooth power control module is used to obtain the reference value of the active power output of the doubly fed wind turbine.

[0010] Based on the active power reference value of the doubly fed wind turbine, the basic operating parameters of the doubly fed wind turbine, and the rotor current feedback value, the rotor-side converter modulation voltage reference value is obtained, and the rotor-side converter is adjusted using the rotor-side converter modulation voltage reference value.

[0011] The DC voltage of the converter is proportionally gained and then integratored to generate phase. The modulation voltage of the grid-side converter is obtained based on the phase and the amplitude of the modulation voltage of the grid-side converter. The grid-side converter is then adjusted using the modulation voltage of the grid-side converter.

[0012] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, wherein: the step of obtaining the reference value of the active power output of the doubly-fed wind turbine using a smooth power control module includes: based on the wind turbine rotational speed ω r Rated speed ω of wind turbine rn Obtain the per-unit value of the wind turbine rotation speed The calculation formula is expressed as follows:

[0013]

[0014] in, This represents the per-unit value of the wind turbine rotational speed, ω. r ω represents the wind turbine rotation speed. rn This indicates the rated speed of the wind turbine.

[0015] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, the method of obtaining the reference value of the active power output of the doubly-fed wind turbine using a smooth power control module further includes: adjusting the DC voltage u of the converter. dc Perform gain as The proportional gain is used to obtain the per-unit value u of the DC voltage. dc , is represented as:

[0016]

[0017] Among them, u dc U represents the DC voltage of the converter. dcref Indicates the DC voltage reference value of the converter, u dc This indicates the per-unit value of DC voltage.

[0018] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, the method of obtaining the reference value of the active power output of the doubly-fed wind turbine using a smooth power control module further includes: standardizing the DC voltage per unit value. Subtract 1 as the per-unit deviation of DC voltage DC voltage per unit deviation After passing through a first-order low-pass filter and multiplying by coefficients α and 2π, the output is superimposed with the per-unit value of the wind turbine speed. The sum of the two powers is calculated to the power of three as Den;

[0019] DC voltage per unit deviation Represented as:

[0020]

[0021] Den is represented as:

[0022]

[0023] in, Indicates the per-unit value of DC voltage. This represents the per-unit value of the wind turbine rotation speed, S is the Laplace operator, and T is the low-pass filter time constant.

[0024] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, the method of obtaining the reference value of the active power output of the doubly-fed wind turbine using a smooth power control module further includes: setting the per-unit value of the wind turbine rotation speed. Num is obtained by performing a cube power operation, and then the maximum power point tracking control coefficient k of the doubly-fed wind turbine is used as the basis. g and the rated active power output P of the doubly fed wind turbine generator set gn Obtain the reference value P of the output active power of the doubly-fed wind turbine. gref ;

[0025] Num is represented as:

[0026]

[0027] Reference value P of the output active power of a doubly-fed wind turbine gref Represented as:

[0028]

[0029] Among them, P gn This indicates the rated active power output of the doubly-fed wind turbine. Indicates the per-unit value of DC voltage. This represents the per-unit value of the wind turbine rotation speed, S is the Laplace operator, T is the low-pass filter time constant, and kg This represents the maximum power point tracking control coefficient of the doubly fed wind turbine.

[0030] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, the transfer function of the first-order low-pass filter is expressed as:

[0031]

[0032] Where S is the Laplace operator and T is the low-pass filter time constant; the parameter range of the low-pass filter time constant T is: 0.01≤T≤1.

[0033] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, the coefficient α is represented as:

[0034]

[0035] in, This indicates the per-unit value of DC voltage.

[0036] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, wherein: obtaining the reference value of the rotor-side converter modulation voltage includes:

[0037] Collect basic operating parameters of the doubly-fed induction generator (DFIG) wind turbine, specifically: the active power feedback value P of the DFIG wind turbine output. g The reactive power feedback value Q of the doubly-fed wind turbine generator set g ;

[0038] The reference value P of the active power output of the doubly fed wind turbine is... gref Feedback value P of the active power output of the doubly fed wind turbine g The difference is calculated, and the result is input into the first PI controller. The output of the first PI controller is then compared with the feedback value i of the q-axis component of the rotor current. qr The difference is calculated and input into the second PI regulator. The output of the second PI regulator is used as the reference value v for the q-axis component of the rotor-side converter modulation voltage. qr_ref ;

[0039] Reactive power setting of grid-connected doubly-fed induction generator (DFIG) reference value Q for reactive power of DFIG. gref ;

[0040] The reactive power reference value Q of the doubly fed wind turbine gref With output reactive power feedback value Q gThe difference is calculated, and the result is input into the third PI controller. The output of the third PI controller is then compared with the feedback value i of the d-axis component of the rotor current. dr The difference is calculated, and the interpolation value is input into the fourth PI controller. The output of the fourth PI controller is used as the reference value v for the d-axis component of the rotor-side converter modulation voltage. dr_ref .

[0041] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, wherein: obtaining the grid-side converter modulation voltage includes:

[0042] For the DC voltage u of the converter dc Perform gain as The proportional gain is used to generate phase θ in the integrator; the voltage amplitude U of the grid-side converter is modulated. m The phase θ input sine wave generation module is used to obtain the output of the sine wave generation module as the modulation voltage U of the grid-side converter. mabc .

[0043] As a preferred embodiment of the flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption described in this invention, wherein: the regulating rotor-side converter and the regulating grid-side converter include:

[0044] The reference value v of the q-axis component of the modulated voltage of the rotor-side converter. qr_ref Reference value v of the d-axis component of the rotor-side converter modulation voltage dr_ref The trigger pulse signal S is generated after PWM modulation. rabc Acting on the rotor-side converter; modulating the grid-side converter voltage U mabc The trigger pulse signal S is generated after PWM modulation. gabc It acts on the grid-side converter.

[0045] The beneficial effects of this invention are as follows: The flexible interconnected diamond-shaped distribution network control method proposed in this invention for high-proportion wind power consumption dynamically tracks the grid frequency through the DC voltage of the doubly-fed induction generator (DFIG) wind turbine converter, replacing the traditional method of using a phase-locked loop (PLL) to observe the grid frequency. Under the condition of wind power fluctuations, the proposed smooth power control module can dynamically adjust the maximum power tracking control curve of the DFIG wind turbine based on the observed converter DC voltage and wind turbine speed, suppressing the fluctuations in the active power output of the DFIG wind turbine and the grid frequency, thereby improving the frequency stability of the flexible interconnected diamond-shaped distribution network and enhancing its ability to absorb high-proportion renewable energy. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0047] Figure 1 The overall flowchart of a flexible interconnected diamond-shaped distribution network control method for high-proportion wind power consumption is provided in one embodiment of the present invention.

[0048] Figure 2 This is a control block diagram of a doubly fed wind turbine generator connected to a flexible interconnected diamond-shaped distribution network according to an embodiment of the present invention;

[0049] Figure 3 This is a block diagram of the smooth power control module operation provided in one embodiment of the present invention;

[0050] Figure 4 A schematic diagram of a flexible interconnected distribution network for wind power access in the prior art, provided as an embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram of wind speed fluctuations provided in one embodiment of the present invention;

[0052] Figure 6 A comparison diagram of the power grid frequency under the conventional control method provided in one embodiment of the present invention and the control method proposed in the present invention is shown.

[0053] Figure 7 A comparison diagram of wind farm output power under the conventional control method provided in one embodiment of the present invention and the control method proposed in the present invention. Detailed Implementation

[0054] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0055] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0056] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0057] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0058] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] Example 1

[0061] Reference Figures 1-3 As one embodiment of the present invention, a control method for a flexible interconnected diamond-shaped distribution network oriented towards high-proportion wind power consumption is provided, comprising:

[0062] S1: Collect the wind turbine speed and converter DC voltage, and use the smooth power control module to obtain the reference value of the active power output of the doubly fed wind turbine.

[0063] Specifically, such as Figure 2 As shown, the smoothing module is used to obtain the reference value P of the output active power of the doubly-fed wind turbine. gref The steps are as follows:

[0064] Based on wind turbine speed ω r Rated speed ω of wind turbine rn Obtain the per-unit value of the wind turbine rotation speed The calculation formula is expressed as:

[0065]

[0066] in, This represents the per-unit value of the wind turbine rotational speed, ω. r ω represents the wind turbine rotation speed. rn This indicates the rated speed of the wind turbine.

[0067] For the DC voltage u of the converter dc Perform gain as The proportional gain is used to obtain the per-unit value of the DC voltage. Represented as:

[0068]

[0069] Among them, u dc U represents the DC voltage of the converter. dcref This indicates the DC voltage reference value of the converter. Indicates the per-unit value of DC voltage;

[0070] DC voltage per unit value Subtract 1 as the per-unit deviation of DC voltage DC voltage per unit deviation After passing through a first-order low-pass filter and multiplying by coefficients α and 2π, the output is superimposed with the per-unit value of the wind turbine speed. The sum of the two powers is calculated to the power of three as Den;

[0071] DC voltage per unit deviation Represented as:

[0072]

[0073] Den is represented as:

[0074]

[0075] in, Indicates the per-unit value of DC voltage. This represents the per-unit value of the wind turbine rotation speed, S is the Laplace operator, and T is the low-pass filter time constant.

[0076] Per unit value of wind turbine speed Num is obtained by performing a cube power operation, and then the maximum power point tracking control coefficient k of the doubly-fed wind turbine is used as the basis. g and the rated active power output P of the doubly fed wind turbine generator set gn Obtain the reference value P of the output active power of the doubly-fed wind turbine. gref ;

[0077] Num is represented as:

[0078]

[0079] Reference value P of the output active power of a doubly-fed wind turbine gref Represented as:

[0080]

[0081] Among them, P gn This indicates the rated active power output of the doubly-fed wind turbine. Indicates the per-unit value of DC voltage. This represents the per-unit value of the wind turbine rotation speed, S is the Laplace operator, T is the low-pass filter time constant, and k g This represents the maximum power point tracking control coefficient of the doubly fed wind turbine.

[0082] It is important to know that the transfer function of a first-order low-pass filter is expressed as:

[0083]

[0084] In the formula, S is the Laplace operator and T is the low-pass filter time constant;

[0085] In order to obtain better control effect, the parameter range of the low-pass filter time constant T is: 0.01≤T≤1;

[0086] It should be noted that, compared to the traditional first-order low-pass filter transfer function, the transfer function proposed in this embodiment specifically adds a low-pass filter time constant T to filter out interference components in the detected power grid frequency, thereby improving the accuracy of power grid frequency detection.

[0087] It should also be noted that the coefficient α is expressed as:

[0088]

[0089] in, This indicates the per-unit value of DC voltage.

[0090] S2: Based on the active power reference value of the doubly fed wind turbine, the basic operating parameters of the doubly fed wind turbine, and the rotor current feedback value, obtain the rotor-side converter modulation voltage reference value, and adjust the rotor-side converter using the rotor-side converter modulation voltage reference value.

[0091] It should be noted that the basic operating parameters of a doubly-fed induction generator (DFIG) wind turbine include: the active power feedback value P of the DFIG wind turbine output. g The reactive power feedback value Q of the doubly-fed wind turbine generator set g .

[0092] It should also be noted that in this embodiment, the basic operating parameters of the doubly fed wind turbine are obtained by conventional measurement methods, based on instantaneous power theory, by detecting the three-phase voltage and current at the grid connection point.

[0093] Furthermore, obtain the reference value v of the q-axis component of the rotor-side converter modulation voltage. qr_ref The specific steps are as follows:

[0094] The reference value P of the active power output of the doubly fed wind turbine is... gref Feedback value P of the active power output of the doubly fed wind turbine g The difference is calculated, and the result is input into the first PI controller. The output of the first PI controller is then compared with the feedback value i of the q-axis component of the rotor current. qr The difference is calculated and input into the second PI regulator. The output of the second PI regulator is used as the reference value v for the q-axis component of the rotor-side converter modulation voltage. qr_ref .

[0095] Furthermore, obtain the reference value v of the d-axis component of the rotor-side converter modulation voltage. dr_ref The specific implementation steps are as follows:

[0096] The reactive power reference value Q of the doubly fed wind turbine gref With output reactive power feedback value Q g The difference is calculated, and the result is input into the third PI controller. The output of the third PI controller is then compared with the feedback value i of the d-axis component of the rotor current. dr The difference is calculated, and the interpolation value is input into the fourth PI controller. The output of the fourth PI controller is used as the reference value v for the d-axis component of the rotor-side converter modulation voltage. dr_ref .

[0097] It should be noted that the reactive power feedback value Q of the doubly-fed wind turbine is... g The reactive power requirement of the grid-connected doubly-fed wind turbine can be set independently.

[0098] Furthermore, the reference value v of the q-axis component of the rotor-side converter modulation voltage is... qr_ref Reference value v of the d-axis component of the rotor-side converter modulation voltage dr_ref The trigger pulse signal S is generated after PWM modulation. rabc It acts on the rotor-side converter to regulate it.

[0099] S3: The DC voltage of the converter is proportionally gained and then integratored to generate phase. The modulation voltage of the grid-side converter is obtained based on the phase and the amplitude of the modulation voltage of the grid-side converter. The grid-side converter is adjusted using the modulation voltage of the grid-side converter.

[0100] Specifically, regarding the converter DC voltage udc Perform gain as The proportional gain is input into the integrator to generate the phase θ, where θ = ∫ proportional gain result dt.

[0101] Furthermore, the modulation voltage amplitude U of the grid-side converter is... m The phase θ input sine wave generation module is used to obtain the output of the sine wave generation module as the modulation voltage U of the grid-side converter. mabc ;

[0102] It should be noted that the modulation voltage amplitude U of the grid-side converter m It can be obtained based on the set value of reactive power.

[0103] It should also be noted that the sine wave generation module is used to process the modulation voltage amplitude U of the grid-side converter. m With phase θ, it can be expressed as:

[0104] U ma =U m *cos(θ)

[0105] U mb =U m *cos(θ-2π / 3)

[0106] U mc =U m *cos(θ+2π / 3)

[0107] Furthermore, the grid-side converter modulation voltage U mabc The trigger pulse signal S is generated after PWM modulation. gabc It acts on the grid-side converter to regulate it.

[0108] It should be noted that the DC voltage of the doubly-fed induction generator (DFIG) wind turbine converter is used to dynamically track the grid frequency, replacing the traditional method of using a phase-locked loop (PLL) to observe the grid frequency. Under the condition of wind power fluctuations, the smoothing power control module can dynamically adjust the maximum power tracking control curve of the DFIG wind turbine based on the observed converter DC voltage and wind turbine speed, suppressing the fluctuations in the output active power of the DFIG wind turbine and the grid frequency, thereby improving the frequency stability of the flexible interconnected diamond-shaped distribution network and enhancing its ability to absorb high proportions of new energy.

[0109] Example 2

[0110] Reference Figures 1-7 As an embodiment of the present invention, a control method for a flexible interconnected diamond-shaped distribution network oriented towards high-proportion wind power consumption is provided. To verify the beneficial effects of the present invention, a simulation experiment is conducted for scientific demonstration.

[0111] In this embodiment, the rated capacity of the doubly-fed wind farm is 55MW, and the doubly-fed wind farm contains 11 turbines, each with a rated capacity of 5MW; the short-circuit capacity of the flexible interconnected diamond-shaped distribution network to which the doubly-fed wind farm is connected is 100MW.

[0112] This embodiment employs the following method under conditions of significant wind speed fluctuations: Figure 4 A comparative analysis of the control effects of the conventional maximum power point tracking control method and the control method proposed in this invention is performed, with wind speed fluctuations as shown in the figure. Figure 5 As shown.

[0113] First, under conditions of large wind speed fluctuations, the frequency of the power grid and the output power of the wind farm are measured during conventional maximum power point tracking control.

[0114] Secondly, under the condition of large fluctuations in the same wind speed, the frequency of the power grid and the output power of the wind farm are measured using the control method proposed in this invention.

[0115] from Figure 6 and Figure 7 As can be seen, when the doubly fed wind turbine adopts the conventional maximum power point tracking control method, there are significant fluctuations in the grid frequency and the active power output of the wind farm. By adopting the control method proposed in this invention, the fluctuations in the distribution network frequency and the active power output of the wind farm are greatly suppressed.

[0116] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A control method for flexible interconnected diamond-shaped distribution networks with high wind power consumption, characterized in that, include: The wind turbine speed and converter DC voltage are collected, and the smooth power control module is used to obtain the reference value of the active power output of the doubly fed wind turbine. Based on the active power reference value of the doubly fed wind turbine, the basic operating parameters of the doubly fed wind turbine, and the rotor current feedback value, the rotor-side converter modulation voltage reference value is obtained, and the rotor-side converter is adjusted using the rotor-side converter modulation voltage reference value. The DC voltage of the converter is proportionally gained and then integratored to generate phase. The modulation voltage of the grid-side converter is obtained based on the phase and the amplitude of the modulation voltage of the grid-side converter. The grid-side converter is adjusted using the modulation voltage of the grid-side converter. The method of obtaining the reference value of the active power output of the doubly-fed wind turbine using the smooth power control module includes: based on the wind turbine rotation speed. Rated speed of wind turbine Obtain the per-unit value of the wind turbine rotation speed The calculation formula is expressed as: ,in, This indicates the per-unit value of the wind turbine rotation speed. Indicates the wind turbine speed. This indicates the rated speed of the wind turbine. The method of obtaining the reference value of the active power output of the doubly-fed wind turbine using the smooth power control module also includes: adjusting the DC voltage of the converter. Perform gain as The proportional gain is used to obtain the per-unit value of the DC voltage. , is represented as: in, Indicates the DC voltage of the converter. This indicates the DC voltage reference value of the converter. Indicates the per-unit value of DC voltage; The method of obtaining the reference value of the active power output of the doubly-fed wind turbine using the smooth power control module also includes: scaling the DC voltage per unit value. Subtract 1 as the per-unit deviation of DC voltage DC voltage per-unit deviation After passing through a first-order low-pass filter and multiplying by coefficients α and 2π, the output is superimposed with the per-unit value of the wind turbine speed. The sum of the cubed powers is used as the basis for calculation. ; DC voltage per unit deviation Represented as: Represented as: in, Indicates the per-unit value of DC voltage. This indicates the per-unit value of the wind turbine rotation speed. For the Laplace operator, This is the time constant for the low-pass filter.

2. The control method for flexible interconnected diamond-shaped distribution networks oriented towards high-proportion wind power consumption as described in claim 1, characterized in that: The method of obtaining the reference value of the active power output of the doubly-fed wind turbine using the smooth power control module also includes: setting the per-unit value of the wind turbine rotation speed. Obtain by performing a cube operation ,based on , Maximum power point tracking control coefficient of doubly-fed wind turbine and the rated active power output of the doubly fed wind turbine Obtain reference values ​​for the output active power of doubly-fed wind turbine generators. ; Represented as: Reference value of active power output of doubly-fed wind turbine Represented as: in, This indicates the rated output active power of the doubly-fed wind turbine. Indicates the per-unit value of DC voltage. This indicates the per-unit value of the wind turbine rotation speed. For the Laplace operator, The time constant of the low-pass filter. This represents the maximum power point tracking control coefficient of the doubly fed wind turbine.

3. The control method for flexible interconnected diamond-shaped distribution networks oriented towards high-proportion wind power consumption as described in claim 1, characterized in that: The transfer function of the first-order low-pass filter is expressed as: in, For the Laplace operator, The low-pass filter time constant; The parameter range is: 0.01≤T≤1.

4. The control method for flexible interconnected diamond-shaped distribution networks oriented towards high-proportion wind power consumption as described in claim 3, characterized in that: The coefficient Represented as: in, This indicates the per-unit value of DC voltage.

5. The control method for flexible interconnected diamond-shaped distribution networks oriented towards high-proportion wind power consumption as described in claim 4, characterized in that: The process of obtaining the reference value of the modulation voltage of the rotor-side converter includes: Collect basic operating parameters of the doubly-fed induction generator (DFIG) wind turbine, specifically: the feedback value of the DFIG wind turbine output active power. Feedback value of reactive power output of doubly-fed wind turbine ; Reference value of the output active power of the doubly fed wind turbine. Feedback value of active power output from doubly fed wind turbine The difference is calculated, and the result is input into the first PI controller. The output of the first PI controller is then compared with the feedback value of the q-axis component of the rotor current. The difference is calculated and input into the second PI controller. The output of the second PI controller is used as the reference value for the q-axis component of the rotor-side converter modulation voltage. ; Reactive power setting of grid-connected doubly-fed induction generator (DFIG) reference value for reactive power of DFIG. ; Reference value of reactive power of doubly fed wind turbine Feedback value of output reactive power The difference is calculated, and the result is input into the third PI controller. The output of the third PI controller is then compared with the feedback value of the d-axis component of the rotor current. The difference is calculated, and the interpolation value is input into the fourth PI controller. The output of the fourth PI controller is used as a reference value for the d-axis component of the rotor-side converter modulation voltage. .

6. The control method for flexible interconnected diamond-shaped distribution networks oriented towards high-proportion wind power consumption as described in claim 5, characterized in that: The acquisition of the grid-side converter modulation voltage includes: DC voltage of the converter Perform gain as The proportional gain is used to generate the phase by inputting the proportional gain result into the integrator. Modulate the voltage amplitude of the grid-side converter. With phase Input the sine wave generation module and obtain its output as the modulation voltage of the grid-side converter. .

7. The control method for flexible interconnected diamond-shaped distribution networks oriented towards high-proportion wind power consumption as described in claim 6, characterized in that: The regulating rotor-side converter and the regulating grid-side converter include: Reference value of the q-axis component of the modulated voltage of the rotor-side converter Reference value of the d-axis component of the modulation voltage of the rotor-side converter The trigger pulse signal is generated after PWM modulation. Acting on the rotor-side converter; modulating the voltage of the grid-side converter. The trigger pulse signal is generated after PWM modulation. It acts on the grid-side converter.

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