基于双d-q坐标系的并网逆变器控制策略

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Abstract The control mechanism of direct current control mode and indirect current control mode for grid-connected inverter is analyzed according to mathematical model of inverter. The d-axis component of inverter voltage (u_d) is always equal to peak voltage of inverter when power factor (PF) is equal to 1 and line equivalent resistor (R) is ignored. A novel indirect current control strategy, which uses closed-loop of d-axis component of inverter current (#em/em#_d) adjusting q-axis component of inverter voltage (u_q), is proposed according to this conclusion. The power factor is affected by R and accuracy of detecting voltage. In order to improve the power factor, a control strategy for grid-connected inverter based on double d-q coordinates is proposed. The different variables are located in different coordinates. However, all variables satisfy parallelogram law and the inverter can run in unity power factor. The validity and advancement of the proposed control scheme are verified by the simulation results.

Key words： Grid-connected inverter indirect current control mode direct current control mode power factor double d-q coordinates

Received: 25 September 2010 Published: 07 March 2014

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	Wu Yunya
	Kan Jiarong
	Xie Shaojun

Cite this article:

Wu Yunya,Kan Jiarong,Xie Shaojun. Control Strategy for Grid-Connected Inverter Based on Double d-q Coordinates[J]. Transactions of China Electrotechnical Society, 2011, 26(8): 106-112.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I8/106

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