Boost PFC带恒功率负载控制方法的研究

Research on the Control Method of Boost PFC with Constant Power Load

恒功率负载在电力系统中所占的比重越来越大,而为保证带恒功率负载的BoostPFC变换器稳定运行的控制方法尤为复杂。利用输入输出线性化方法构造出一种适宜恒功率负载的控制方法,并通过研究发现BoostPFC变换器的输出电压纹波与负载成比例关系,进而提出通过测量纹波变化预测出负载功率变化,利用预测得到的负载功率代入控制方法可实现BoostPFC变换器带恒功率负载的稳定运行。PSIM数字仿真实验结果表明,该方法具有良好的动、静态特性,输入电流能精准跟踪输入电压,电流波形光滑;负载跳变时,动态响应快,输出稳定,表明该方法对负载具有良好的鲁棒性。

Constant power load plays a more and more important role in power system,and the control method to ensure the stable operation of Boost PFC converter with constant power load is particularly complex.A new method was proposed to solve this problem.The input-output linearization method was used to construct a control method suitable for constant power load.Through research,it was found that the output voltage ripple of Boost PFC converter is proportional to the load,and then it was proposed that the load power change can be predicted by measuring the ripple change,and the stable operation of Boost PFC converter with constant power load can be realized by bringing the predicted load power into control method.The results of PSIM digital simulation show that the method has good dynamic and static characteristics,the input current can accurately track the input voltage,and the current waveform is smooth;when the load changes,the dynamic response is fast and the output is stable,which show that the method has good robustness to the load.