无电容电压传感器的LCL滤波器控制策略
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摘要
对于三相LCL逆变器并网系统中的谐振问题,提出一种基于虚拟电容电压反馈的有源阻尼控制策略。该控制策略是在传统电容电压反馈有源控制策略的基础上,研究滤波电容电压和并网电压的拓扑结构,推导出滤波电容电压和并网电压之间的简单数学关系,从而在不加装滤波电容电压传感器的情况下,将得到的虚拟滤波电容电压反馈到电压控制内环,抑制滤波器谐振。最后,通过仿真验证了该控制策略的有效性。
An active damping control strategy based on virtual capacitor voltage feedback is proposed for the resonant problem in the grid-connected system of three-phase LCL inverter.The topology of filter capacitor voltage and gridconnected voltage on the basis of the traditional active control strategy of capacitor voltage feedback are studied and to derive a simple mathematical relation between filter capacitor voltage and grid-connected voltage.The virtual filter capacitor voltage is feedback to the voltage control inner ring without the filter capacitor voltage sensor which can suppress the resonance of the filter.Finally, the effectiveness of the control strategy is verified by the simulation.
An active damping control strategy based on virtual capacitor voltage feedback is proposed for the resonant problem in the grid-connected system of three-phase LCL inverter.The topology of filter capacitor voltage and gridconnected voltage on the basis of the traditional active control strategy of capacitor voltage feedback are studied and to derive a simple mathematical relation between filter capacitor voltage and grid-connected voltage.The virtual filter capacitor voltage is feedback to the voltage control inner ring without the filter capacitor voltage sensor which can suppress the resonance of the filter.Finally, the effectiveness of the control strategy is verified by the simulation.
引文
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[2] Wenming Guo,Longhua Mu.Control Principles of Microsource Inverters Used in Microgrid[J]. IEEE Trans. on Protection and Control of Modem Power Systems, 2016,1:1-7.
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[4]鲍陈磊.LCL型并网逆变器的并网电流调节器和电容电流反馈有源阻尼设计[D].武汉:华中科技大学,2013.
[5]沈量,尹洪全,李振清.一种单相并网逆变器的控制策略的研究[J].东北电力大学学报,2013,33(Z1):76-79.
[6]金亮亮,周荔丹,姚钢,等.适用于并网逆变器的新型LCL滤波器[J].电力系统保护与控制,2016,44(11):1-8.
[7]魏星,肖岚,姚志垒,等.三相并网逆变器的LCL滤波器设计[J].电力电子技术,2010,44(11):13-15.
[2] Wenming Guo,Longhua Mu.Control Principles of Microsource Inverters Used in Microgrid[J]. IEEE Trans. on Protection and Control of Modem Power Systems, 2016,1:1-7.
[3] Erickson W,Maksimovic D.Fundamentals of Power Electronics(2nd. Editon)[M].Norwell, MA:Kluwer 2001.
[4]鲍陈磊.LCL型并网逆变器的并网电流调节器和电容电流反馈有源阻尼设计[D].武汉:华中科技大学,2013.
[5]沈量,尹洪全,李振清.一种单相并网逆变器的控制策略的研究[J].东北电力大学学报,2013,33(Z1):76-79.
[6]金亮亮,周荔丹,姚钢,等.适用于并网逆变器的新型LCL滤波器[J].电力系统保护与控制,2016,44(11):1-8.
[7]魏星,肖岚,姚志垒,等.三相并网逆变器的LCL滤波器设计[J].电力电子技术,2010,44(11):13-15.