基于双d-q坐标系的并网逆变器控制策略

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摘要根据三相并网逆变器的数学模型分析了直接电流控制策略和间接电流控制策略的控制机理。忽略线路电阻时, 在单位功率因数情况下, 逆变器输出电压d轴分量总等于电网电压峰值, 据这一特征提出对逆变器d轴电流分量#em/em#_d单闭环的间接电流控制策略。分析了新方法的并网功率因数受线路阻抗与电网电压检测精度的影响程度, 并根据造成功率因数低的原因提出了一种在双d-q坐标下的并网控制策略, 将不同的量设定在不同的坐标系中, 但双坐标中所有的量仍满足平行四边形法则, 实现了单位功率因数并网运行。仿真结果表明, 所提控制策略具有良好的控制效果。

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	吴云亚
	阚加荣
	谢少军

关键词 ：并网, 逆变器, 间接电流控制, 直接电流控制, 功率因数, 双d-q坐标

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

收稿日期: 2010-09-25 出版日期: 2014-03-07

PACS:

464

基金资助:国家自然科学基金资助项目(51077070)

作者简介: 吴云亚女, 1979年生, 讲师, 研究方向电力电子技术。阚加荣男, 1979年生, 硕士, 讲师, 研究方向为功率电子变换。

引用本文:

吴云亚, 阚加荣, 谢少军. 基于双d-q坐标系的并网逆变器控制策略[J]. 电工技术学报, 2011, 26(8): 106-112. Wu Yunya, Kan Jiarong, Xie Shaojun. Control Strategy for Grid-Connected Inverter Based on Double d-q Coordinates. Transactions of China Electrotechnical Society, 2011, 26(8): 106-112.

链接本文:

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

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