基于平衡实现理论的变流器并网系统降阶模型

doi:10.19595/j.cnki.1000-6753.tces.191507

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Abstract The complex and high-order characteristics of the full-order model of the grid-connected converter system limit its application in theoretical analysis. The establishment of a suitable reduced-order model is an important way to simplify the theoretical analysis of the grid-connected converter system. The existing order reduction method mainly obtains the order reduction model at a certain time scale by simplifying the dynamic characteristics of the model at other time scales. The accuracy of the model is not high. To this end, this paper proposes a method for reducing the order of grid-connected converter systems based on balanced realization theory. This method obtains the corresponding Gramian matrix by solving its Lyapunov equation, and then obtains an equivalent balanced system. On this basis, according to the Hankle singular value of the balanced system, key state variables in the balanced system are retained to achieve system reduction. In this paper, voltage source converter (VSC) were used as examples. Based on the proposed method, reduced-order models of single and multiple grid-connected converters system considering the connection impedance between the converters were established. Matlab/Simulink time-domain simulation shows that the proposed method can achieve effective and accurate order reduction for grid-connected converter systems.

Key words： Voltage source converter (VSC) small signal model balanced realization theory Hankle singular value model reduction

Received: 18 November 2019

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TM46

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	Articles by authors
	Xu Jiancheng
	Sun Jianjun
	Zhong Peijun
	Yin Yaozong
	Zha Xiaoming

Cite this article:

Xu Jiancheng,Sun Jianjun,Zhong Peijun等. Reduced-Order Model of Grid-Connected Converter System Based on Balanced Realization Theory[J]. Transactions of China Electrotechnical Society, 2021, 36(zk1): 255-264.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191507 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/Izk1/255

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