多电源系统切换时中性线不同接地方式对不间断电源电路性能影响的仿真分析

Simulation Analysis of the Influence of Different Grounding Methods of Neutral Wire on the Performance of Uninterruptible Power Supply Circuit in Multi-power Systems Switching

多电源系统在相互切换时因中性线接地方式的不同,将会对不间断电源(uninterruptible power supply,UPS)系统性能产生较大影响。首先,在三极和四极自动转换开关基础上,通过不同接地方式搭建了多电源系统电路等效模型,探讨了不同电路结构的优缺点,并通过搭建MATLAB/Simulink仿真模型,对多电源系统电路性能指标进行了仿真验证;在多电源系统电路基础上,搭建了多电源系统UPS电路MATLAB/Simulink仿真模型,对多电源系统UPS电路关键性能指标进行了仿真实验。其次,以多电源系统UPS电路不产生杂散电流,中性线不分流,中性线接地基准连续,多路输入电源之间、输入电源与输出电源之间、输入电源与旁路电源之间电气隔离等性能指标为优化目标,提出了3种多电源系统UPS电路结构优化方案。最后,搭建3种优化改进电路MATLAB/Simulink仿真模型,对3种UPS电路性能指标进行仿真实验,实验表明改进方案三“多电源系统UPS电源电路加装旁路隔离变压器”具有多电源系统UPS电源电路最优性能指标。

Due to the different grounding methods of the neutral line,the performance of the alternating current uninterruptible power supply(UPS)system will be greatly affected when the multiple power supply systems are switched to each other.Firstly,based on tripolar and quadrupole automatic transfer switch,the circuit equivalent model of multiple power supply system was established through different grounding modes.The advantages and disadvantages of different circuit structures were discussed,and the performance index of multi-power system circuit was simulated and verified by building MATLAB/Simulink simulation model.Based on the circuit of the multi-power system,the MATLAB/Simulink simulation model of the UPS circuit of the multi-power system was built,and the key performance indexes of the UPS circuit of the multi-power system were simulated.Secondly,three kinds of UPS circuit structure optimization schemes of multi-power system were proposed to optimize the performance indexes of UPS circuit of multi-power system,such as no stray current,no neutral line shunting,continuous neutral line grounding reference,electrical isolation between multiple input power sources,input power and output power sources,and input power and bypass power sources.Finally,three optimized and enhanced circuit MATLAB/Simulink simulation models were constructed,and the performance indexes of the three UPS circuits were simulated.The experimental results demonstrate that the improved scheme three of“multi-power system UPS power circuit with bypass isolation transformer”has the optimal performance indexes of the multi-power system UPS power circuit.