大功率能量回馈型交流电子负载及其在电力系统动模实验中的应用

研究了基于现代电力电子技术的交流电子负载的控制方法和策略;为提高电子负载的动态性能,提出采用数值计算的方法得到实时参考电流,并给出了该方法的数值收敛域;提出将定阻抗工作模式下的电子负载应用于动模实验中模拟输电线路、用电负荷以及短路实验.仿真和实验结果表明,采用的控制策略和方法是有效的,所设计的实验样机不但能在定阻抗工作模式下有效地模拟恒定和突变的阻抗,而且还能将电子负载吸收的能量回馈电网,节约电能.本文所做的工作拓宽了电子负载的应用领域,是今后电力系统动模实验的发展方向之一.

High Power Energy Feedback AC Electronic Load and Its Application in Power System Dynamic Physical Simulation

The control methods and strategies of the AC electronic load based on modern power electronic technology are studied in this paper. To improve the dynamic performance of the electronic load, the real time reference current is calculated by means of numerical method, and the convergence area is discussed. It is proposed that the constant impedance mode of the electronic load can be used to simulate the transmission lines and the electric load during normal and short circuit operations. Simulation and experiment results have demonstrated the effectiveness of the proposed control strategies and methods. The experiment prototype has been designed and test results show that it can not only simulate both constant and sudden change impedance in the constant impedance mode, but can also feed the energy absorbed by the electronics load back to the power system simultaneously. The research work has extended the application area of electronic load and is proved to be one of development direction in power system dynamic physical simulation.