Boost PFC变换器的动态斜坡补偿策略分析与设计

发布时间：2018-10-18 11:35

【摘要】：传统斜坡补偿方式可以有效抑制峰值电流模式,控制Boost功率因数校正(PFC)变换器系统的次谐波振荡不稳定现象,但是同时会造成电流过零处的死区问题,从而引起较大的被控平均电流畸变和功率因数恶化问题。对此提出一种动态斜坡补偿控制新思路,有效改善斜坡补偿方式存在的电流畸变问题,同时能确保对次谐波振荡的抑制。基于系统输入输出的准稳态关系导出了所提动态斜坡补偿的控制方程,其相应实现电路简单可行。进一步分析了被控平均电流的谐波畸变特性,给出了斜坡补偿方式和所提动态斜坡补偿方式下平均输入电流的谐波分解结果,从理论角度说明了所提控制的改进补偿效果。仿真结果与理论结果基本相吻合,所得的实验结果很好地证实了所提动态斜坡补偿控制的可行性,也证实了理论分析结论的正确性。
[Abstract]:The traditional slope compensation method can effectively suppress the peak current mode and control the Boost power factor to correct the instability of subharmonic oscillation in the (PFC) converter system, but at the same time, it will cause the dead time problem at the zero crossing of the current. Therefore, the controlled average current distortion and the deterioration of power factor are caused. In this paper, a new idea of dynamic slope compensation control is proposed, which can effectively improve the current distortion of slope compensation and ensure the suppression of subharmonic oscillation. Based on the quasi steady state relation of the input and output of the system, the control equation of the dynamic slope compensation is derived, and the corresponding circuit is simple and feasible. Furthermore, the harmonic distortion characteristics of the controlled average current are analyzed, the harmonic decomposition results of the average input current under the slope compensation and the proposed dynamic slope compensation are given, and the improved compensation effect of the proposed control is explained theoretically. The simulation results are in good agreement with the theoretical results. The experimental results confirm the feasibility of the proposed dynamic slope compensation control and the correctness of the theoretical analysis results.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;
【基金】：国家自然科学基金资助项目(51377185)~~
【分类号】：TM46

【相似文献】