全桥式DC／AC／DC变换器的建模与仿真  

Modeling and Simulation of Full-bridge DC/AC/DC converter

作　　者：皇金锋[1] 

机构地区：[1]陕西理工学院陕西,汉中723003

出　　处：《计算机仿真》2013年第4期336-338,343,共4页Computer Simulation

基　　金：陕西省教育厅科学研究计划资助项目(2010JS042)

摘　　要：研究高频DC/AC/DC开关变换器的控制系统优化问题。由于该变换器是典型的非线性系统,采用的PI控制器存在响应速度慢、超调量大等问题。为克服上述问题,优化高频DC/AC/DC开关变换器的暂态和稳态性能,采用了三极点、两零点控制器,解决了高频DC/AC/DC开关变换器的暂态和稳态性能差的问题。利用状态空间平均法及欧拉公式建立了全桥式DC/AC/DC开关变换器的动态小信号数学模型,根据所建立的数学模型采用频域法对系统进行设计,保证系统输出电压具有良好的电源调整率和负载调整率。仿真结果表明,三极点、两零点控制策略比传统PI控制具有更好的动态调节和稳态误差调节特性,超调量、调节时间等都得到了明显的改善,并为控制器设计优化提供了参考。Research high frequency DC/AC/DC converter control system optimization. In order to optimize the frequency DC/AC/DC converter transient and steady - state performances, the paper used three - pole, two zero con- trollers to solved the question of high frequency DC/AC/DC switch converter transition condition and the stable state performance difference. By using state space average method and Euler formula, a small signal mathematical model of full - bridge DC/AC/DC converter was established. According to the established mathematical model, the fre- quency domain method was used to design the system and ensure that the output voltage of the system has a good line regulation and load regulation rate. The simulation results show that, the three - pole, two zero control strategy is better adjusting characteristics of both dynamic and steady state errors than the traditional PI control, and the over- shoot and adjusting time have been significantly improved, so it provide a reference to the optimization of controller design.

关 键 词：全桥式变换器 建模与分析 PSIM 仿真 

分 类 号：TM341[电气工程—电机]