基于捕食策略遗传算法的3电平中点箝位型逆变器特定谐波消除脉宽调制技术  

SHEPWM Technique Applied to Tri-level Neutral Pointed Clamped Inverter Based on Predation Strategies Genetic Algorithm

作　　者：叶满园[1] 周琪琦[1] 蔡鸿[1] 李宋[1] 

机构地区：[1]华东交通大学电气与电子工程学院,南昌330013

出　　处：《高电压技术》2014年第11期3569-3576,共8页High Voltage Engineering

基　　金：国家自然科学基金(51167006);江西省青年科学基金(20114BAB216004)~~

摘　　要：基于遗传算法(GA)的特定谐波消除脉宽调制(SHEPWM)技术存在易早熟、易收敛于局部最优解等问题,影响了开关角度解的精确度。为此,提出了基于改进遗传算法的3电平SHEPWM控制技术。该方法通过采用捕食策略遗传算法(PSGA)对3电平SHEPWM方程组进行求解,解决了传统数值算法对初值的依赖性、标准遗传算法易早熟等问题,同时该方法可拓展到更多电平的SHEPWM方程组求解中。以1/4周期3角度SHEPWM方程组为例,给出了各个调制度下的开关角度轨迹,同时给出了较高调制度下的另1组可行解。算例结果验证了该方法的正确性。The selected harmonics elimination pulse width modulation（SHEPWM） based on the genetic algorithm（GA） has certain defects such as premature phenomenon and converging to local optimal solution, which lower the precision of its solution of switch point. Consequently, we propose a tri-level SHEPWM control technology based on the improved genetic algorithm. The control method adopts the predation strategies genetic algorithm（PSGA） to solve tri-level SHEPWM equations, and hence avoids the dependence on initial values（which is common in the traditional numerical algorithms） and the problem of premature in the standard genetic algorithm. In addition, the application of method can be expanded into solving SHEPWM equations of more levels. Taking the three angles in 1/4 cycle SHEPWM equations as an example, we present the trajectory of switching angles under different modulations and a set of feasible solution under high modulations, and verify the proposed method according to these results.

关 键 词：3电平逆变器 遗传算法 特定谐波消除 脉宽调制 SHEPWM 多解性 调制度 

分 类 号：TM464[电气工程—电器]