电网不平衡情况下并网逆变器多目标协调控制策略研究

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摘要在电网电压不平衡情况下, 并网逆变器输出有功功率和电流将存在二次脉动和畸变。为了提高电网不平衡时并网逆变器并网电流质量, 有效降低并网逆变器对电网的冲击, 提出了一种基于神经网络的电网不平衡情况下并网逆变器多目标协调控制策略。该策略根据瞬时功率计算参考电流矢量, 建立多控制目标的统一解析表达式, 并利用ADALINE神经网络对参考电流矢量表达式系数进行优化。为了提高系统的抗干扰性能, 采用增量式PI控制器进行电流控制, 并利用RBF神经网络在线调整PI控制器参数。仿真和实验结果验证了所提方法的有效性和适用性。

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	阳同光
	桂卫华

关键词 ：电网不平衡, 并网逆变器, 多目标协调控制, 神经网络

Abstract：Under unbalanced power grid voltage conditions, the fluctuating active power and current have quadratic ripples and distortions in the grid-connected inverters.In order to improve the quality of the grid-connected current, and reduce the impacts to the grid caused by the grid-connected inverter effectively, a grid-connected inverter control strategy based on the neural network is proposed.The unified analytic formula of the control target is established based on the instantaneous power and the accordingly derived output reference current.An ADALINE neural network is use to optimize the coefficient of the reference current vector formula.In order to improve the system anti-interference capability, a RBF neural network is used to adjust the parameters of the PI controller on-line.The effectiveness and applicability of the proposed strategy are finally verified by simulation and experimental results.

Key words： Grid voltage unbalance grid-connected inverter multi-objective coordinated control neural network

收稿日期: 2014-11-21 出版日期: 2015-06-29

PACS:

TM315

基金资助:国家自然科学基金重点项目(61321003), 国家自然科学基金(51377050)和湖南省教育厅重点项目(13A011)资助。

通讯作者: 阳同光男, 1974年生, 博士, 副教授, 研究方向为光伏发电系统及其控制。

引用本文:

阳同光, 桂卫华. 电网不平衡情况下并网逆变器多目标协调控制策略研究[J]. 电工技术学报, 2015, 30(11): 148-157. Yang Tong-guang, Gui Weihua. Research on Multi-objective Coordinated Control Strategies of Grid-connected Inverter Under Unbalanced Voltage Conditions. Transactions of China Electrotechnical Society, 2015, 30(11): 148-157.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I11/148

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