输入串联输出并联变换器的输入均压稳定性分析

Stability Analysis of Input-voltage Sharing for Input-series Output-parallel Converter

输入均压是输入串联输出并联(input-series output-parallel,ISOP)变换器稳定工作的保障。通过分析ISOP系统的输入电压与等效电阻及输入电压与输入功率的关系,提出实现输入均压稳定的必要条件,并给出两个输入均压稳定判据,判断ISOP系统的输入均压稳定性。分析ISOP逆变器输出有功功率和无功功率的传输过程以及对输入均压稳定性的影响,并用所提出的稳定判据证明ISOP逆变器的输出均流控制策略不能实现输入均压稳定,而输入均压控制策略可以实现输入均压稳定。通过实验验证了稳定判据及分析的正确性。

Input-voltage sharing is important for the input-series output-parallel （ISOP） system. Requirements were proposed to ensure the stability of input-voltage sharing by analyzing the relationship between input-voltage and equivalent resistor and the relationship between input-voltage and input power. Two stability theories of input-voltage sharing were also provided to evaluate the system stability. Active and reactive power was transformed in the ISOP inverter. How it works and what is the effect on the input-voltage sharing were analyzed. According to the stability theories, it proved that the output-current control strategy couldn’t keep input-voltage sharing, while the input-voltage sharing control strategy could do. Experimental results verify the stability theories and analysis.