基于背靠背三电平电压变换器的直驱式风力发电系统  

Direct-Driven Wind Power Generation System Based on Back-to-Back Three-Level Converter

作　　者：杨勇[1] 阮毅[1] 张朝艺[1] 沈欢庆[1] 汤燕燕[1] 

机构地区：[1]上海大学机电工程与自动化学院,上海市闸北区200072

出　　处：《电网技术》2009年第18期148-155,共8页Power System Technology

基　　金：台达环境与教育基金会电力电子科技发展计划的资助(DRES2007002)

摘　　要：直驱式风力发电系统由2个背靠背二极管中点钳位型三电平电压变换器构成,机侧变换器采用间接转矩向量控制,通过调节永磁同步发电机的转速,实现风能最大跟踪;网侧变换器采用电网电压定向的向量控制,实现d、q轴电流解耦控制,使d轴电流控制有功功率,q轴电流控制无功功率。针对直驱式风力发电系统中能量流向以及二极管中点钳位型三电平的特点,提出了一种只需检测上、下电容电压,首发向量全部为负短向量,利用冗余电压向量控制中点电压平衡的方法。为提高该系统抗电网电压波动能力,采用软件锁相环,实现电网电压的同步。仿真结果表明,该控制策略实现了最大风能跟踪和功率因数为1的逆变。A direct-driven wind power generation system constitutes by two diode neutral-point-clamped back-to-back three-level voltage converters, the indirect torque vector control is applied to converter at generator side and the maximum wind energy tracking is implemented by adjusting the rotating speed of permanent synchronous generators; the grid voltage orientation vector control is applied to the converter at power grid side to implement decoupling control of d-axis and q-axis currents, the d-axis current controls active power and the q-axis current controls reactive power. According to the energy flow direction in direct-driven wind power generation system and the feature of diode neutral-point-clamped three level back-to-back three-level voltage converter, a voltage balancing approach is proposed, in which only the voltages of top- and bottom-capacitors are to be detected, the negative short vectors are taken as the first-sending vectors and the neutral voltage balance is controlled by redundant vector voltages. To enhance its ability against grid voltage fluctuation, the software phase-locked loop（PLL） is adopted to synchronize the voltage of wind power system with grid voltage. Simulation results show that the proposed control strategy realizes the maximum wind energy tracking and unity power factor for the grid-side inverter.

关 键 词：间接转矩向量控制 三电平 解耦控制 软件锁相环 

分 类 号：TM614[电气工程—电力系统及自动化]