Robust controller design method for ensuring stable operation of direct-current bus voltage

A technology of DC bus voltage, robust controller, applied in the direction of AC network circuits, electrical components, circuit devices, etc.

Pending Publication Date: 2020-09-22
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

At present, when designing a robust controller, only the parameterized uncertainty in the system is considered, and the current control link obtained by the simplified model is easily affected by some nonlinear factors.

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  • Robust controller design method for ensuring stable operation of direct-current bus voltage
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  • Robust controller design method for ensuring stable operation of direct-current bus voltage

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Embodiment Construction

[0065] Below in conjunction with accompanying drawing, the present invention is further described:

[0066] The invention provides a method for designing a robust controller to ensure the stable operation of the DC bus voltage, characterized in that the method includes the following steps:

[0067] S1: Construct a small-signal model of the DC side outlet voltage of the DC distribution network voltage source converter;

[0068] S2: Perform unstructured uncertainty modeling on the current control link in the small-signal model of the DC side outlet voltage;

[0069] S3: Perform parametric uncertainty modeling on the voltage control link in the small-signal model of the DC side outlet voltage;

[0070] S4: Calculate the robust controller K(S) of the converter using the 2-DOF closed-loop design structure;

[0071] S5: According to the robust control μ-synthesis theory, determine the robust control design index;

[0072] S6: Input the robust control design index in step S5 into ...

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Abstract

The invention provides a robust controller design method for ensuring stable operation of DC bus voltage. The method comprises the following steps: S1, constructing a DC side outlet voltage small signal model of a DC power distribution network voltage source converter; s2, performing unstructured uncertainty modeling on a current control link in the DC side outlet voltage small signal model; s3, performing parameterized uncertainty modeling on a voltage control link in the DC side outlet voltage small signal model; s4, calculating a converter robust controller K (S) by using a two-degree-of-freedom closed-loop design structure; s5, determining a robust control design index according to a robust control mu-comprehensive theory; and S6, inputting the robust control design indexes in the stepS5 into Matlab software, and completing robust controller design by utilizing a toolbox of Matlab. Through uncertain control simulation of the DC bus voltage in the DC distribution network, the controller designed by using the analysis method provided by the invention has good robust stability and robust performance.

Description

technical field [0001] The invention relates to the technical field of stable operation of a DC distribution network system, in particular to a robust controller design method for ensuring the stable operation of a DC bus voltage. Background technique [0002] Due to the diversity of DC grid structures, voltage source converters may be used to connect different types of DC / AC sources and loads, and as these units with strong frequency dependence are continuously connected or withdrawn from operation, it is bound to affect the The stability of the DC bus voltage is affected. Therefore, it is of great significance to study DC voltage robust controllers considering factors such as DC side filter instantaneous power, system parameter uncertainty and disturbance. At present, when designing a robust controller, only the parameterized uncertainty in the system is considered, and the current control link obtained by the simplified model is easily affected by some nonlinear factors....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/18H02J3/00
CPCG06F30/18H02J3/00H02J2203/20
Inventor 林莉金鑫范米贾源琦马明辉王静芝罗皓汪莎莎
Owner CHONGQING UNIV
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