基于功率变化子空间的直接功率控制

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摘要根据瞬时功率理论,建立三相电压型并网逆变器的功率数学模型,考虑了瞬时功率对功率变化率产生的交叉耦合影响,推导出维持瞬时功率不变的平衡矢量的表达式,建立功率变化子空间,在子空间中研究逆变器输出电压空间矢量对瞬时功率的作用,分析传统方法矢量选择的不足之处。在此基础上,提出一种基于功率变化子空间的直接功率控制方法。该方法通过设定有功功率和无功功率优先级别,建立开关表,更准确地选择了电压空间矢量,使得并网逆变器拥有更宽的功率调节范围,减小了功率脉动。最后通过仿真与实验对两种不同的方法进行对比,验证了该方法的可行性和正确性。

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	周小杰
	张霞
	汪飞

关键词 ：并网逆变器, 功率变化子空间, 交叉耦合, 直接功率控制, 开关表

Abstract：The instantaneous power mathematical model of three-phase voltage-source inverter was established based on instantaneous power theory. Considering the instantaneous power for power rate of cross-coupling effect, the equilibrium vector was derived and the subspace of power variation was established. Then the effect of voltage space vector on instantaneous power in the subspace was studied, compared with the traditional switching tables. A new direct power control strategy based on subspace of power variation was proposed, which built a dynamic switching table by setting active and reactive power priority reference. The proposed strategy can select the voltage space vector more accurately, broaden the power adjustment range of inverter, and reduce the power ripple. The proposed control strategy was verified by the simulation and experiment.

Key words： Grid-connected inverter power variation subspace cross-coupling direct power control switching table

收稿日期: 2013-12-07 出版日期: 2015-12-30

PACS:

TM464

基金资助:国家自然科学青年基金项目（51107078）和台达环境与教育基金会《电力电子科教发展计划》项目（DREG2012006）资助

作者简介: 周小杰男,1979年生,博士研究生,讲师,研究方向为新能源并网发电。张霞女,1986年生,硕士研究生,研究方向为电力电子与电力传动。

引用本文:

周小杰, 张霞, 汪飞. 基于功率变化子空间的直接功率控制[J]. 电工技术学报, 2015, 30(24): 142-151. Zhou Xiaojie, Zhang Xia, Wang Fei. Direct Power Control Based on Subspace of Power Variation. Transactions of China Electrotechnical Society, 2015, 30(24): 142-151.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I24/142

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