背靠背双PWM变流器的协调控制策略  

Study on Cooperative Control Strategies of Back-to-Back Dual-PWM Converter

作　　者：沈阳武[1] 彭晓涛[1] 孙元章[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电网技术》2012年第1期146-152,共7页Power System Technology

基　　金：中央高校基本科研业务费专项资金资助(201120702020014);湖北省自然科学基金项目(2008CDB307)~~

摘　　要：以背靠背双脉宽调制(pulse width modulation,PWM)变流器为研究对象,首先建立了其动态数学模型,接着从实现其多种控制功能的角度出发,设计了其构成电压源型变流器(voltage source converter,VSC)的双闭环控制器结构,并基于所建立电压源型变流器的d-q同步旋转坐标数学模型,研究了双闭环控制中用于实现VSC输出电流解耦控制的内环控制策略,以及用于实现VSC直流电压恒定、交流电压跟踪和功率四象限动态调节的多种外环控制策略。最后通过数字仿真,不仅考察了双PWM变流器中2个VSC实现不同外环控制策略的动态协调响应特性,而且仿真结果同时验证了所研究控制策略的可行性。Dual-PWM converter can simultaneously realize multiple control functions, so it has been used increasingly and widely in renewable energy sources and power system. Taking dual-PWM converter as research object, firstly its dynamic mathematical model is built. For the purpose of implementing its multi control functions, a dual closed-loop controller for voltage source converter （VSC） composed of dual-PWM converter is designed and based on the built d-q synchronous rotational coordinate mathematical model of VSC the inner-loop control strategy of the dual closed loop controller to implement decoupled control for output current of VSC as well as the multi outer-loop control strategies to implement constant DC voltage, AC voltage tracking and dynamic power control in four quadrants are researched. By means of digital simulation, not only dynamic cooperative response characteristics of different outer-loop control strategies implemented by the two VSCs in dual-PWM converter are investigated, but also the feasibility of the proposed control strategies is verified by simulation results.

关 键 词：双脉宽调制变流器 电压源型变流器 双环控制 解耦控制 

分 类 号：TM46[电气工程—电器]