基于LCL的风电并网逆变器无传感器控制  

Study on Voltage Sensor-less Control for Wind Grid Connection Inverter with LCL Filter

作　　者：王晗[1] 窦真兰[1] 张建文[1] 蔡旭[1,2] 

机构地区：[1]上海交通大学电子信息与电气工程学院电力传输与功率变换控制教育部重点实验室风力发电研究中心,上海200240 [2]上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室,上海200240

出　　处：《电工技术学报》2013年第1期188-194,共7页Transactions of China Electrotechnical Society

基　　金：上海市科学基金资助项目(08DZ1200504)

摘　　要：基于LCL滤波器的风电并网逆变器(LCL-GCI)需要增加传感器去检测电容电压或者电容电流来抑制LCL滤波器存在的固有谐振问题,提高了系统的控制成本,降低了系统的运行可靠性。鉴于此,在分析虚拟磁链观测思想和LCL-GCI数学模型的基础上,提出了LCL-GCI的无电网和无电容电压传感器控制技术,只检测变换器侧电流和直流母线电压,通过状态重构的方法设计电网电压观测器和LCL电容电压和电流观测器。利用观测器输出的电容电流进行前馈控制,从而实现了LCL-GCI的有源阻尼控制。采用低通滤波器来代替纯积分器来设计观测器,使得系统具有较强的抗干扰、抗负载扰动能力。实验结果表明,LCL-GCI的无传感器控制技术能够减少传感器数量,降低系统的控制成本,具有一定的应用价值。For the resonance problem of LCL filter,it is needed to increase the number of sensors to detect capacitor voltage or the capacitor current signals,which enhances the control costs and reduces the reliability of the system.In view of this,the core ideal of the virtual flux observing and the mathematical model of LCL-GCI are analyzed and then the sensor-less control technology without grid and capacitor voltage sensors for LCL-GCI is presented.The active damping control of LCL-GCI is realized using the capacitor current feed-forward which is fetched by the LCL capacitor observer in the case of only detecting the converter current and DC-link voltage.In the design of observer,the low-pass filter is used to replace the pure integrator to obtain strong ability of anti-load disturbances.Experimental results show that the voltage sensor-less control technology can observer the grid voltage and capacitor voltage precisely,make the system working steadily and has good anti-disturbance ability,and decrease the numbers of used sensors,reduce the system control cost and has great application values.

关 键 词：LCL滤波器 风电并网逆变器 无电压传感器控制 虚拟磁链观测 

分 类 号：TM461[电气工程—电器]