Buck变流器级联系统直流母线电压补偿控制策略

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Abstract For the design of DC distributed power system(DPS), stability analysis is the most important but complex issue. As the size of system gets increasingly larger, it is almost impossible to take the DC DPS as a whole for stability analysis. Since cascade connection is one of the most popular connection forms of distributed architecture, investigating and improving the stability of cascaded system is very important to ensure stable operation of DC DPS. In addition to optimizing the parameters of converters, the voltage bus conditioner(VBC) is also an effective way to improve the stability of DC bus voltage in DC-DC cascaded system. Many research results were proposed in the control method and compensation capacity of VBC. Some of them can be applied to large-signal disturbance occasions. Overall, there is still room for further investigation. From the point of view of large-signal stability, this paper proposes a novel compensation control method for VBC based on the mixed potential theory and gyrator large signal model. With the proposed control method, effective compensation can be achieved according to the parameters of source and load converters. Meanwhile, this control method is derived from the stability theorem of mixed potential theory, so the large-signal stability of cascaded system with VBC is guaranteed theoretically. A cascaded system formed by two peak current-mode controlled Buck converters is adopted for simulation and experiments. The effectiveness of the proposed control method are verified by the experimental results.

Key words： Cascaded system control strategy of bus voltage compensation large-signal stability mixed potential theory gyrator model

Received: 12 March 2013 Published: 23 March 2015

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TM46

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	Du Weijing
	Zhang Junming
	Qian Zhaoming

Cite this article:

Du Weijing,Zhang Junming,Qian Zhaoming. Compensation Methodology for DC Bus Voltage of Cascaded System Formed by Buck Converters[J]. Transactions of China Electrotechnical Society, 2015, 30(1): 135-142.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I1/135

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