电力电容器过电压周期试验主回路技术方案分析

从国标对电力电容器过电压周期试验的波形要求出发,对进行电力电容器过电压周期试验的串联谐振法和并联谐振法进行了深入的理论分析,并利用Matlab/Simulink对这两种方法进行了仿真,理论分析和仿真均表明:串联谐振法在减少试验电源容量和满足国标规定的试验电压波形两方面存在矛盾,而且不容易进行折中选择,不适合作为电力电容器过电压周期试验的主回路方案;而并联谐振法在减少试验电源容量和满足国标规定的试验电压波形两方面不存在任何矛盾,是电力电容器过电压周期试验最合理的主回路方案.低压验证性试验进一步验证了并联谐振法作为电力电容器过电压周期试验的主回路方案的正确性.

Main Circuit Technical Program Analysis on Power Capacitor Over-voltage Cycle Test

The cascade resonant method and parallel resonant method of the power capacitor over-voltage cycle test were deeply analyzed in theory based on the GB requirements of the power capacitor over-voltage cycle test waveform, and both methods were simulated by Matlab/Simulink. Both theoretical analysis and simulation show that ： the cascade resonant method is not suitable for the main loop program of the power capacitor over-voltage cycle test because there is a contradiction between reducing the test power supply capacity and meeting the requirements of GB test voltage waveform, and it is not easy to carry out a compromise choice; however, the parallel resonant method is the most reasonable program of the main loop because there is not any contradiction between reducing the test power supply capacity and meeting the requirements of GB test voltage waveform. The low-voltage confirmatory test further verifies the correctness of the parallel resonant method as the main loop program of the power capacitor over-voltage cycle test.