单相单级PFC变换器预测控制算法研究

Research on Predictive Control Algorithms for Single-phase Single-stage PFC Converter

预测控制算法可以克服典型数字功率因数校正(PFC)算法结构复杂、运算量大的缺点,其运算得到了很大程度的简化。但对系统动态性能要求较高时,输出电压纹波会通过电压环进入到电流控制环节,进而影响PFC效果。针对该问题,提出一种具有快速动态响应能力的改进预测控制算法。通过在预测控制算法中引入补偿量,来对占空比进行补偿计算,以保证在提高输出动态响应速度的前提下,较好地实现PFC功能。最后通过仿真和实验,验证了所提改进预测控制算法的有效性。

The predictive control algorithm can solve some problems of the digital power factor correction （PFC） algo- rithm, such as the complex structure and lots of calculations.However, the output voltage ripple will get into the con- trol loop when the system requires a high dynamic response speed and then affects the performance of PFC.Aiming at the problem,a fast dynamic response predictive control algorithm is proposed.The output voltage ripple is sampled to control the duty ratio.This algorithm can correct the power factor when the dynamic response speed of the system is improved.Simulation and experimental results verify the correctness and feasibility of the algorithm.