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A reduced-order variable selection method for power electronic interface grid-connected system model reduction

A technology for power electronics and model reduction, which is applied in general control systems, control/regulation systems, instruments, etc., and can solve problems such as the reduction of state variables without considering different model reduction errors.

Active Publication Date: 2022-05-17
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] However, the current application status does not consider the reduction of different state variables for different model reduction errors.

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  • A reduced-order variable selection method for power electronic interface grid-connected system model reduction
  • A reduced-order variable selection method for power electronic interface grid-connected system model reduction
  • A reduced-order variable selection method for power electronic interface grid-connected system model reduction

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Embodiment Construction

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0045] The order-reduction variable selection method for power electronics interface grid-connected system model order reduction described in this embodiment mainly considers performing order-reduction processing on the system under the condition that the order-reduction error requirement of the model is met. Using the eigenvalue sensitivity method to analyze the correlation between the eigenvalue and each state variable, the main influencing state variables of each eigenvalue are obtained. By continuously expanding the selection range of the domina...

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Abstract

A method for selecting a reduced-order variable for reducing the order of a power electronic interface grid-connected system model, which can improve the adverse effects of the current application that does not consider the order-reduced processing of different state variables for different model reduction errors; including the following steps 1, Establish the electromagnetic transient model of the power electronic interface grid-connected system; 2. Obtain the eigenvalue of the system at the steady-state operating point, and introduce the eigenvalue sensitivity method to analyze the correlation between the eigenvalue and the state variables of the system; 3. Extract The singular perturbation parameters corresponding to the state variables of the system are used to establish the singular perturbation model of the system; 4. According to the given model reduction error range, different selection methods of dominant eigenvalues ​​are applied to obtain the dominant influence state variables of the dominant eigenvalues , to reduce the order of the remaining state variables. The present invention can select different state variables for order reduction processing according to the requirements of the order reduction error of the model, fully considering the practicability and effectiveness of the method for selecting the order reduction variables.

Description

technical field [0001] The invention relates to the technical field of new energy power generation systems, in particular to a method for selecting a reduced-order variable for reducing the order of a power electronic interface grid-connected system model. Background technique [0002] At present, a large number of new energy sources are connected to the grid through power electronic interfaces, making the power system a high-level development trend of power electronics, which leads to a significant increase in the order and time scale span of the nonlinear high-order model used to describe the dynamic behavior of the power system, resulting in Solve a series of problems such as difficulties. Model reduction is one of the effective methods to solve the above problems. [0003] In the current research results, the methods for reducing the order of the grid-connected system model of the power electronics interface mainly include the balance method and the coherent equivalent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王磊龙文浩
Owner HEFEI UNIV OF TECH
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