摘要
本文提出一种基于幅相控制方式、具有电流前馈的单位功率因数三相电压型SAPWM变流器。根据相量间的直角三角形关系和能量平衡原则,建立了该系统的低频数学模型,分析了系统的相量调节方式。在此基础上,将直流侧负载电压的变化率转化为到达下一个平衡状态时相位与调制深度的附加控制量,以提高系统的快速性。实验证明:控制系统实现了单位功率因数和能量的双向流动,且输出直流电压恒定可调,相电流的谐波含量非常小,系统动态性能较好。
This paper presents a novel current feedforward control strategy for a three\|phase SAPWM AC to DC voltage type converter based on phase and amplitude control (PAC). With right\|angle triangle relation of phasors and principle of conservation of energy, a phasor adjusting method and the relevant low\|frequency math model of the system are analyzed in details, and both converting and inverting operating mode of the converter are discussed. For improving the traditional PAC dynamic performance, variable load current is detected indirectly by the change of the DC voltage, which is fed to the control system as an additional control variable to generate modulation index and phase angle. Also, the algorithm is deduced and principle of system is introduced. Experimental results from a 3kw laboratory device are included to demonstrate the effectiveness of the proposed control strategy.
出处
《电工电能新技术》
CSCD
2003年第2期10-14,共5页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金资助项目(59977012)
2002年台达电力电子科教发展基金资助项目
