基于同步调幅的逆变器并联技术研究

首先分析了单模块逆变器参数差异对输出电压跟踪基准电压幅值和相位的影响,得出参数差异对输出电压幅值的影响要比对相位的影响大得多的结论。然后分析了输出电压幅值差和相位差对并联系统输出功率的影响,最后得出参数差异造成的输出电压幅值差是使并联系统输出功率不均分的主要原因。在分析结果的基础上提出基准同步后调节基准幅值的环流控制策略,并分析了环流控制的效果,最后给出试验结果。

Study of Paralleling Inverter based on Phase Synchronizing and Amplitude Modulating

At first this paper analyzes the influence of the parameter differences of the single module on the output voltage when it tracks the reference voltage.The analysis result is that the effect on the amplitude of the output voltage is larger than that on the phase.Then the affects of the differences of the amplitude and phase on the output power of the parallel system are analyzed. Finally,the conclusion is given that the difference of the amplitude caused by the parameter differences is the main reason of the imbalanced output power in the parallel system. According to conclusion, a control strategy for the parallel system is proposed,which modulates the amplitude of the reference voltage in proportion to the loop current based on synchronizing the phase of the reference voltage.The effect of the loop current control strategy is an-alyzed,and the experiment results are given.