交流电网逆变电源频率恒定优化控制

摘要

交流电网中的谐波对电能的质量造成严重影响,为了解决这一问题,对交流电网中的逆变电源进行了优化控制.针对交流电网单相桥式逆变电源的三种控制方式,即PI控制、瞬时重复控制和复合控制进行了理论分析,对比了不同控制方式的优缺点.通过分析可以看出,采用复合控制的逆变电源,可以有效地抑制系统的谐波和减少了开关损耗,提高了输出效率,同时还减小了系统的稳态误差,使电源的性能得到极大地提高.在输出端为了抑制高次谐波设计了LC滤波器,在理论分析的基础上,对三种不同控制方式的电路进行了MATLAB的仿真,结果表明,复合控制方式是一种可行有效抑制谐波的控制方法并且在工程中很容易实现.%The harmonics of AC grid will have a serious impact on the quality of electrical energy.In order to solve this problem,the optimized control is used in the AC grid.Three control models of single-phase bridge inverter are theoretically analyzed,and the advantages and disadvantages of different control models are compared.It is shown that,if the inverter uses complex control,it will effectively suppresses the harmonics of the system and reduces the switching losses,and improves output efficiency,while also reduces the steady-state error of the system,so the performance of the power supply has been greatly improved.In order to suppress the output of the higher harmonic,the LC filter is designed,and three control models for the circuit are simulated by MATLAB.The results show that compound control is a feasible and effective method of harmonic suppression control.At the same time,it is very easy to be implemented.