双PWM变换器一体化控制策略  

Integrated control strategy for dual-PWM converter

作　　者：李昆鹏[1] 万健如[1] 宫成[1] 李世群[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《电机与控制学报》2013年第4期72-78,共7页Electric Machines and Control

基　　金：国家质检总局公益性行业科研专项资助项目(2012104016-3;201310153)

摘　　要：针对双PWM变换器依赖附加协调控制策略解决一体化的问题,研究PWM整流器及逆变器独立控制策略对协调性能的影响,借助瞬时功率中间变量,提出一种不外加其他协调方法的双PWM变换器一体化控制策略。整流器侧建立在离散化数学模型基础上,在固定时间周期内,以满足指标函数最小为原则预测下一时刻电网电流,借助空间矢量调制技术获得整流器期望开关状态。逆变器侧采用基于空间矢量调制技术的直接转矩控制。理论分析表明,由负载参数变化直接引起的直流母线电压波动通过电压环调节以瞬时功率形式作用于整流器电网电流预测环节。仿真和实验结果表明,双PWM变换器能快速响应负载变化情况并恢复稳态,对负载及系统参数扰动具有鲁棒性,验证了所提策略的有效性。Aiming at the problem that dual pulse width modulation （PWM） converter relys on additional coordination control strategy to realize integrative control, the influences of PWM rectifier and inverter to coordination are studied. An integrated control strategy for dual PWM converter that not depends on the other harmonious methods is presented by use of the middle variable of instantaneous power. The control strategy for rectifier was built on the discrete mathematical model, and a cost function was chosen for pre- dicting ac input current through minimizing itself in fixed cyclical time. Meanwhile, the state of switches for rectifier was determined with the help of space vector pulse width modulation technology. The control strategy for inverter adopted direct torque control method based on the space vector pulse width modula- tion technique. A theoretical analysis shows that load parameter variation causes fluctuation of DC-bus voltage, and the fluctuation in instantaneous power shape acts on the predictive current for rectifier by voltage loop. The experiment and simulation results show quick response to the changes of the load and to resume steady state, and strong robustness to load and system parameters variations. The availability of the integrated control strategy for dual PWM converter is proved.

关 键 词：预测控制 空间矢量脉宽调制 直接转矩控制 指标函数 变换器 

分 类 号：TM461[电气工程—电器]