基于DPWM1的无差拍解耦控制的三相并网逆变器  

Deadbeat Decoupling Control of Three-Phase Grid-Connected Inverters Based on DPWM1

作　　者：杨勇[1] 阮毅[2] 吴国祥[3] 赵景波[1] 

机构地区：[1]苏州大学城市轨道交通学院,苏州215021 [2]上海大学机电工程与自动化学院,上海200072 [3]南通大学,南通226019

出　　处：《电工技术学报》2010年第10期101-107,共7页Transactions of China Electrotechnical Society

基　　金：台达环境与教育基金会<电力电子科教发展计划>资助项目(DRES2007002)

摘　　要：针对三相并网逆变器的特点,提出了一种新的基于不连续PWM调制的无差拍解耦控制策略。和传统不加补偿的无差拍控制器相比,新的无差拍控制器在相同的采样频率下可以减少输出电流脉动和畸变,改善了三相并网逆变器的性能。分析了不同不连续PWM的特点,根据三相并网逆变器的特点,DPWM1方式被采用。采用电网电压定向矢量控制和无差拍控制,实现了三相并网逆变器的d轴电流和q轴电流的解耦控制,使d轴电流控制三相并网逆变器的有功功率,q轴电流控制三相并网逆变器的无功功率。加了控制延时补偿的无差拍控制器,具备非常快速的动态响应能力,真正实现一拍达到给定值。实验结果验证了该方案的可行性和正确性。The paper proposes a novel deadbeat decoupling control strategy based on discontinuous PWM（DPWM） according to the characteristics of three-phase grid-connected inverters.The new deadbeat controller can reduce the ripple and distortion of output currents at the same sampling frequency compared with traditional deadbeat controller without control time delay compensation,which will improve the performance of the three-phase grid-connected inverter.Different discontinuous PWM are analyzed and the mode of discontinuous pulse width modulation 1（DPWM1） is adopted in view of the characteristics of three-phase grid-connected inverters.It is realized the decoupling control of d-axis current and q-axis current under using grid voltage orientation vector control and deadbeat control,which makes the active power and the reactive power be independently controlled by d-axis current and q-axis current.The deadbeat controller with control time delay compensation has a fast dynamic response,which really realizes getting the given values in one step.The experimental results show that the proposed deadbeat decoupling control strategy provides a high performance solution for three-phase grid-connected inverters,which verifies the feasibility and correctness of the control strategy at the same time.

关 键 词：不连续PWM 无差拍 电网电压定向 解耦控制 

分 类 号：TM721[电气工程—电力系统及自动化]