【摘要】 本文主要针对交流电子负载的控制策略进行了研究,并进行了硬件实现以及对电子负载的性能进行分析。针对传统控制方法不能精确模拟各种类型负载的问题,提出了一种指令阻抗结合SVPWM的控制策略,并给出了指令阻抗转化为指令电流的计算方法。通过MATLAB仿真验证了该控制策略的可行性。在硬件实现部分采用了带LCL滤波的三相PWM变换器构成主电路,基于TMS320F28335 DSP控制器实现了基于指令阻抗和SVPWM的控制算法,并进行了实验研究。通过实验证明了设计方案的可行性,能够精确实现对不同性质负载的电子模拟。在此基础上,通过实验对交流电子负载的性能进行了研究,分析了不同开关频率下、不同性质电子负载模拟侧电流谐波情况,进行了频谱分析,总结了其变化规律。当电子负载硬件参数已经固定的情况下,在模拟不同类型负载时,为了得到谐波含量更低的电流,可根据变化规律对电子负载开关频率进行选择。更多还原

【Abstract】 The control strategy of AC electronic load is mainly studied, and the performance of AC electronic load is analyzed through hardware experiment. Aiming at the problem that various types of loads can′t be accurately simulated by traditional control methods, a control strategy of command impedance combined with SVPWM is proposed, and a calculation method for converting command impedance into command current is given. The feasibility of the control strategy is verified by the simulation of MATLAB. In the hardware implementation part, a three-phase PWM converter with LCL filtering is used to form the main circuit. Based on the TMS320 F28335 DSP controller, the control algorithm based on command impedance and SVPWM is implemented and experimental research is carried out. The feasibility of the design has been proved by experiments, and the precise control of different electronic analog loads has been realized. On this basis, the performance of AC electronic load is studied through experiments. Through spectrum analysis, the current harmonics of the analog side of different electronic loads at different switching frequencies are analyzed, and the variation law is summarized. When the hardware parameters of the electronic load are fixed, the switching frequency of the electronic load can be selected according to the changing law in order to obtain the lower harmonic current when simulating different types of loads.更多还原