Network configuration type electromagnetic scale stability control method and system based on phase compensator

Abstract

The present disclosure provides a network configuration type electromagnetic scale stabilizing control method and system based on a phase compensator, relates to the technical field of phase compensators, and comprises the following steps: obtaining virtual damping torques of each link of a network configuration converter grid-connected system; identifying a system electromagnetic oscillation dominant link based on the virtual damping torques of each link; constructing a second-order leading phase compensator and designing a controller structure thereof; calculating a phase lag angle and a margin of the electromagnetic oscillation dominant link, and calculating a phase compensation angle of the second-order leading phase compensator according to the phase lag angle and the margin; adjusting parameters of the second-order leading phase compensator according to the phase compensation angle, and performing network configuration type electromagnetic scale stabilizing control based on the second-order leading phase compensator with the adjusted parameters and the electromagnetic oscillation dominant link; and the present disclosure overcomes the electromagnetic oscillation problem in traditional control and improves the electromagnetic oscillation stability of the system.

Description

Technical Field

[0001] This disclosure relates to the field of phase compensator technology, specifically to a grid-type electromagnetic scale stabilization control method and system based on phase compensators. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] To achieve its goals and vigorously develop new energy sources such as wind and solar power, the traditional power system is gradually evolving into a new type of power system dominated by new energy sources. Grid-connected inverters can independently establish voltage and frequency, which to some extent enhances the power electronic equipment's support capability for the power grid, and they have good adaptability in weak grid environments, thus attracting widespread attention.

[0004] However, in the actual operation of power systems, grid-connected converters and grid components exhibit dynamic interactions on an electromagnetic time scale. When the system is subjected to external disturbances or improper control parameter settings, electromagnetic oscillations can easily occur.

[0005] Existing oscillation suppression methods for grid-type converters mostly focus on suppressing subsynchronous oscillations, with relatively insufficient attention and research on electromagnetic oscillation stability. Furthermore, most existing methods rely on the regulation of a single feedback loop, often failing to effectively identify and target the dominant element of the oscillation, thus limiting the control strategies' effectiveness in rapid dynamic response and vibration suppression. Summary of the Invention

[0006] To address the aforementioned issues, this disclosure proposes a grid-type electromagnetic scale stabilization control method and system based on a phase compensator. A second-order leading phase compensator is connected in series in the dominant electromagnetic oscillation stage of the grid converter to improve the negative damping characteristics of the oscillation stage and enhance the electromagnetic oscillation stability of the system.

[0007] According to some embodiments, the present disclosure adopts the following technical solutions:

[0008] A grid-based electromagnetic scale-stabilized control method based on phase compensators includes:

[0009] Obtain the virtual damping torque of each component in the grid-connected system of the grid-connected converter;

[0010] Based on the virtual damping torque of each component, the dominant component of electromagnetic oscillation in the system is identified.

[0011] Construct a second-order lead phase compensator and design its controller structure;

[0012] Calculate the phase lag angle and margin of the dominant electromagnetic oscillation element, and calculate the phase compensation angle of the second-order leading phase compensator based on the phase lag angle and margin.

[0013] The parameters of the second-order leading phase compensator are tuned according to the phase compensation angle. Based on the tuned parameters of the second-order leading phase compensator and the electromagnetic oscillation dominant element, a grid-type electromagnetic scale stabilization control is performed.

[0014] According to some embodiments, the present disclosure adopts the following technical solutions:

[0015] A grid-based electromagnetic scale-stabilized control system based on phase compensators includes:

[0016] The dominant element identification module is used to obtain the virtual damping torque of each element in the grid-connected system of the grid-connected converter, and to identify the dominant element of electromagnetic oscillation in the system based on the virtual damping torque of each element.

[0017] A phase compensator building module is used to build a second-order lead phase compensator and design its controller structure;

[0018] The compensation angle calculation module is used to calculate the phase lag angle and margin of the dominant electromagnetic oscillation element, and to calculate the phase compensation angle of the second-order leading phase compensator based on the phase lag angle and margin.

[0019] The parameter tuning module is used to tune the parameters of the second-order lead phase compensator according to the phase compensation angle.

[0020] The control loop cascade module is used to perform grid-type electromagnetic scale stabilization control based on the second-order leading phase compensator and the electromagnetic oscillation dominant element after the tuning parameters are set.

[0021] According to some embodiments, the present disclosure adopts the following technical solutions:

[0022] A computer program product includes a computer program that, when executed by a processor, implements the aforementioned grid-type electromagnetic scale stabilization control method based on a phase compensator.

[0023] According to some embodiments, the present disclosure adopts the following technical solutions:

[0024] A non-transitory computer-readable storage medium is provided for storing computer instructions, which, when executed by a processor, implement the aforementioned grid-type electromagnetic scale stabilization control method based on a phase compensator.

[0025] According to some embodiments, the present disclosure adopts the following technical solutions:

[0026] An electronic device includes a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to implement the grid-type electromagnetic scale stabilization control method based on phase compensator.

[0027] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0028] This disclosure discloses a grid-based electromagnetic scale-stabilized control method based on a phase compensator. The method identifies the dominant electromagnetic oscillation element of the system; constructs a second-order phase compensator and designs its corresponding transfer function; then, calculates the phase compensation angle based on the phase lag angle and phase margin of the dominant electromagnetic oscillation element; next, calculates the compensator parameters based on the oscillation frequency of the grid converter and the phase compensation angle; finally, connects the tuned phase compensator in series with the dominant electromagnetic oscillation element to overcome the electromagnetic oscillation problem in traditional control and improve the system's electromagnetic oscillation stability.

[0029] The mesh-based electromagnetic scale stabilization control method disclosed herein addresses the significant phase lag in the dominant electromagnetic oscillation stage, which introduces a negative damping effect and may lead to oscillation risk in the closed-loop system. To suppress this risk, a second-order phase compensator is constructed and a corresponding transfer function is designed to introduce phase compensation into the dominant electromagnetic oscillation stage, thereby eliminating its negative damping effect.

[0030] The disclosed method for grid-type electromagnetic scale stabilization control based on phase compensators calculates the compensator parameters according to the oscillation frequency and phase compensation angle of the grid converter, connects the phase compensator with the electromagnetic oscillation dominant element after parameter tuning in series, so that the compensator directly acts on the output signal of the dominant element, thereby adjusting the oscillation phase, improving the system damping characteristics, and enhancing the system stability. Attached Figure Description

[0031] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0032] Figure 1 This is a block diagram of a grid-type converter phase compensation control method according to an embodiment of the present disclosure;

[0033] Figure 2 This is a schematic diagram of a grid-type electromagnetic scale-stabilized control system based on a phase compensator, according to an embodiment of the present disclosure.

[0034] Figure 3 This is a flowchart of a network-based electromagnetic scale stabilization control method based on a phase compensator, according to an embodiment of this disclosure. Detailed Implementation

[0035] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Example 1

[0039] One embodiment of this disclosure provides a grid-based electromagnetic scale stabilization control method based on a phase compensator, the steps of which include:

[0040] Step 1: Obtain the virtual damping torque of each component in the grid-connected system of the grid-connected converter;

[0041] Step 2: Identify the dominant element of electromagnetic oscillation in the system based on the virtual damping torque of each component;

[0042] Step 3: Construct a second-order lead phase compensator and design its controller structure;

[0043] Step 4: Calculate the phase lag angle and margin of the dominant electromagnetic oscillation element, and calculate the phase compensation angle of the second-order leading phase compensator based on the phase lag angle and margin.

[0044] Step 5: Adjust the parameters of the second-order leading phase compensator according to the phase compensation angle, and perform grid-type electromagnetic scale stabilization control based on the adjusted parameters of the second-order leading phase compensator and the electromagnetic oscillation dominant element.

[0045] As one embodiment, the grid-type electromagnetic scale stabilization control method based on a phase compensator disclosed herein employs a control strategy of connecting a second-order leading phase compensator in series within the dominant electromagnetic oscillation stage of the grid-type converter to improve the negative damping characteristics of the oscillation stage. Its control block diagram is shown below. Figure 1 As shown. The specific implementation process is as follows:

[0046] Step 1: Obtain the virtual damping torque of each component of the grid-connected converter system, and identify the dominant component of electromagnetic oscillation based on the virtual damping torque of each component.

[0047] Specifically, firstly, obtain the virtual damping torque of each component of the grid-connected converter system:

[0048] (1)

[0049] in, D line , D Lf , D c These are the virtual damping torque coefficients for the dynamic circuits of the system line, the dynamic filter inductor, and the dynamic control loop, respectively. G line () represents the line dynamic transfer function. G Lf () represents the dynamic transfer function of the filter inductor in the grid converter. G c () represents the dynamic transfer function of the grid converter control loop. ω d The energy amplitude mode oscillation angular frequency, j It is the imaginary unit.

[0050] Furthermore, based on the virtual damping torque of each component, the dominant component of the system's electromagnetic oscillation is identified:

[0051] Based on the magnitude of the virtual damping torque of each stage, if the virtual damping torque of a certain stage is less than 0, then that stage is considered the dominant stage of electromagnetic oscillation, i.e., a certain stage is determined to be... i The condition for the system to be dominated by electromagnetic oscillation is:

[0052] (2)

[0053] in, D i This represents the magnitude of the dynamic damping torque of a certain loop in the system.

[0054] Step 2: Construct a second-order lead phase compensator and design its controller structure;

[0055] Specifically, due to the significant phase lag in the dominant electromagnetic oscillation element, a negative damping effect is introduced, which may lead to oscillation risk in the closed-loop system. To suppress this risk, phase compensation needs to be introduced into the dominant electromagnetic oscillation element to eliminate its negative damping effect.

[0056] Given that the maximum phase lag of the dominant electromagnetic oscillation element is 180°, this disclosure introduces a second-order leading phase compensator into the dominant element for phase compensation, and its control structure is shown in equation (3). The maximum phase lead angle of this second-order leading phase compensator is 180°, which can completely cancel the phase lag of the dominant element. In addition, the steady-state gain of this second-order leading phase compensator is 1, so it will not change the steady-state characteristics of the system after being connected in series.

[0057] (3)

[0058] in, G p ( s ) is the transfer function of the phase compensator; T 1 represents the phase lead time constant; T 2 represents the phase lag time constant.

[0059] Step 3: Calculate the phase lag angle and margin of the dominant electromagnetic oscillation element, and calculate the phase compensation angle of the second-order leading phase compensator based on the phase lag angle and margin.

[0060] Specifically, to counteract the negative damping characteristic of the dominant oscillation element in the system, it is necessary to vector-compensate the dominant electromagnetic oscillation element to the first quadrant after introducing a phase compensator, that is:

[0061] (4)

[0062] in, G lead The transfer function of the dominant electromagnetic oscillation element; G p ( s ) is the transfer function of the phase compensator; ω d It represents the angular frequency of the energy amplitude mode oscillation.

[0063] Therefore, the compensation angle of the second-order leading phase compensator can be determined based on the phase lag angle of the dominant electromagnetic oscillation element:

[0064] (5)

[0065] in, γ s The phase compensator compensates for the angle.

[0066] Meanwhile, to ensure system stability, the second-order lead phase compensator needs to add a certain phase margin on top of compensating for the dominant instability element. Therefore, the phase compensation angle is:

[0067] (6)

[0068] in, φ The compensation angle is for the compensator; γ m The phase margin of the compensator is generally taken between 10° and 20° based on engineering experience.

[0069] Step 4: Adjust the parameters of the second-order leading phase compensator according to the phase compensation angle, and perform grid-type electromagnetic scale stabilization control based on the adjusted parameters of the second-order leading phase compensator and the electromagnetic oscillation dominant element.

[0070] The phase compensator achieves phase compensation over a wide bandwidth centered on the compensation frequency; therefore, the system oscillation frequency is selected. ω d The center frequency used for phase compensation. Phase compensator parameters. T 1. T 2. It can be determined based on the system oscillation frequency and the maximum phase compensation angle. The calculation formula is as follows:

[0071] (7)

[0072] in, ω d This refers to the system oscillation frequency; φ For the maximum phase compensation angle, α It is an intermediate variable.

[0073] Furthermore, the phase compensator with adjusted parameters is connected in series with the electromagnetic oscillation dominant element to improve the electromagnetic oscillation stability of the system. The transfer function of the electromagnetic oscillation dominant element after series connection is:

[0074] (8)

[0075] in, G lead The transfer function of the dominant electromagnetic oscillation element before additional control; G ' lead The transfer function of the dominant electromagnetic oscillation element after additional control is applied; G p This is the transfer function of the phase compensation control loop.

[0076] This disclosure improves the closed-loop response characteristics, suppresses electromagnetic oscillations, and significantly enhances the system's stability and dynamic performance by introducing a phase compensator to adjust the phase margin of the electromagnetic oscillation-dominant element after series connection.

[0077] Example 2

[0078] One embodiment of this disclosure provides a grid-based electromagnetic scale-stabilized control system based on a phase compensator, comprising:

[0079] The dominant element identification module is used to obtain the virtual damping torque of each element in the grid-connected system of the grid-connected converter, and to identify the dominant element of electromagnetic oscillation in the system based on the virtual damping torque of each element.

[0080] A phase compensator building module is used to build a second-order lead phase compensator and design its controller structure;

[0081] The compensation angle calculation module is used to calculate the phase lag angle and margin of the dominant electromagnetic oscillation element, and to calculate the phase compensation angle of the second-order leading phase compensator based on the phase lag angle and margin.

[0082] The parameter tuning module is used to tune the parameters of the second-order lead phase compensator according to the phase compensation angle.

[0083] The control loop cascade module is used to perform grid-type electromagnetic scale stabilization control based on the second-order leading phase compensator and the electromagnetic oscillation dominant element after the tuning parameters are set.

[0084] Example 3

[0085] One embodiment of this disclosure provides a computer program product, including a computer program that, when executed by a processor, implements the aforementioned grid-type electromagnetic scale stabilization control method based on a phase compensator.

[0086] Example 4

[0087] One embodiment of this disclosure provides a non-transitory computer-readable storage medium for storing computer instructions. When these computer instructions are executed by a processor, they implement the network-based electromagnetic scale stabilization control method based on a phase compensator.

[0088] Example 5

[0089] One embodiment of this disclosure provides an electronic device, including a processor, a memory, and a computer program; wherein the processor is connected to the memory, and the computer program is stored in the memory. When the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to implement the network-based electromagnetic scale stabilization control method based on phase compensators.

[0090] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0091] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0092] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A method for network configuration type electromagnetic scale stability control based on phase compensator, characterized in that, include: Obtain the virtual damping torque of each component in the grid-connected system of the grid-connected converter; Based on the virtual damping torque of each component, the dominant component of electromagnetic oscillation in the system is identified. The identification of the dominant electromagnetic oscillation element of the system based on the virtual damping torque of each component includes: Based on the magnitude of the virtual damping torque of each stage, if the virtual damping torque of a certain stage is less than 0, then that stage is considered to be the dominant stage of electromagnetic oscillation. Constructing a second-order lead phase compensator and designing its controller structure; the construction of the second-order lead phase compensator and the design of its controller structure include: Since there is a significant phase lag in the dominant electromagnetic oscillation stage, this phase lag introduces a negative damping effect. To suppress the risk of this negative damping effect, phase compensation is introduced into the dominant electromagnetic oscillation stage to construct a second-order leading phase compensator. The maximum phase lead angle of this second-order leading phase compensator is 180°, which can completely cancel the phase lag of the dominant stage. The steady-state gain of this second-order leading phase compensator is 1. Calculate the phase lag angle and margin of the dominant electromagnetic oscillation element, and calculate the phase compensation angle of the second-order leading phase compensator based on the phase lag angle and margin. The parameters of the second-order leading phase compensator are tuned according to the phase compensation angle. Based on the tuned parameters of the second-order leading phase compensator and the electromagnetic oscillation dominant element, a grid-type electromagnetic scale stabilization control is performed.

2. The network-based electromagnetic scale-stabilized control method based on a phase compensator as described in claim 1, characterized in that, The virtual damping torque of each component of the grid-connected converter system is obtained. Each component of the grid-connected converter system includes the dynamic components of the system lines, the dynamic components of the filter inductors, and the dynamic loop of the control components. The virtual damping torque of each component is as follows: in, D line , D Lf , D c These are the virtual damping torque coefficients for the dynamic circuits of the system line, the dynamic filter inductor, and the dynamic control loop, respectively. G line () represents the line dynamic transfer function. G Lf () represents the dynamic transfer function of the filter inductor in the grid converter. G c () represents the dynamic transfer function of the grid converter control loop. ω d The energy amplitude mode oscillation angular frequency, j It is the imaginary unit.

3. The network-based electromagnetic scale-stabilized control method based on a phase compensator as described in claim 1, characterized in that, The calculation of the phase compensation angle of the second-order lead phase compensator based on the phase lag angle and margin includes: After constructing the second-order leading phase compensator, the electromagnetic dominant element vector is compensated to the first quadrant. The compensation angle of the second-order leading phase compensator is determined according to the phase lag angle of the electromagnetic oscillation dominant element, and the second-order leading phase compensator needs to increase the phase margin on the basis of compensating the dominant unstable element.

4. The network-based electromagnetic scale-stabilized control method based on a phase compensator as described in claim 1, characterized in that, The parameters of the second-order leading phase compensator are tuned according to the phase compensation angle. Based on the tuned parameters of the second-order leading phase compensator and the dominant electromagnetic oscillation element, a network-type electromagnetic scale stabilization control is performed, including: The second-order leading phase compensator achieves phase compensation in a wide frequency band centered on the compensation frequency, and selects the system oscillation frequency as the center frequency of phase compensation for tuning. By connecting the second-order leading phase compensator with the tuned parameters in series with the electromagnetic oscillation dominant element, the transfer function of the electromagnetic oscillation dominant element after series connection is constructed, thereby improving the electromagnetic oscillation stability of the system.

5. A grid-based electromagnetic scale-stabilized control system based on a phase compensator, characterized in that, Specifically, the method for grid-type electromagnetic scale stabilization control based on a phase compensator as described in any one of claims 1-4 includes: The dominant element identification module is used to obtain the virtual damping torque of each element in the grid-connected system of the grid-connected converter, and to identify the dominant element of electromagnetic oscillation in the system based on the virtual damping torque of each element. A phase compensator building module is used to build a second-order lead phase compensator and design its controller structure; The compensation angle calculation module is used to calculate the phase lag angle and margin of the dominant electromagnetic oscillation element, and to calculate the phase compensation angle of the second-order leading phase compensator based on the phase lag angle and margin. The parameter tuning module is used to tune the parameters of the second-order lead phase compensator according to the phase compensation angle. The control loop cascade module is used to perform grid-type electromagnetic scale stabilization control based on the second-order leading phase compensator and the electromagnetic oscillation dominant element after the tuning parameters are set.

6. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the grid-type electromagnetic scale stabilization control method based on phase compensators as described in any one of claims 1-4.

7. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium is used to store computer instructions, which, when executed by a processor, implement the grid-type electromagnetic scale stabilization control method based on a phase compensator as described in any one of claims 1-4.

8. An electronic device, characterized in that, include: The device includes a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to perform the grid-type electromagnetic scale stabilization control method based on a phase compensator as described in any one of claims 1-4.

Images