一种无变压器无储能电容的串联型电压跌落补偿装置实验研究

针对电网电压跌落问题，提出了一种无变压器、无储能元件的串联型电压跌落补偿方案。与传统方案相比，该方案利用线电压对直流电容充电，扩大了补偿电压的范围，能在三相电压同时跌落至正常值的37%或一相电压保持额定而其余两相电压跌至0时实现补偿。在上述新型补偿电路拓扑的基础上对三相四线制系统进行了实验研究，采用三角波跟踪控制策略得到了三相实验结果，验证了该方案的正确性和有效性。

An Experiment Research on Transformerless Series Voltage Sag Compensators without Energy-Storage Capacitor

The authors propose a transformerless serial voltage sag compensation scheme in which the energy-storage component is not equipped.Comparing with traditional voltage sag compensation methods,in the proposed scheme the DC capacitor is charged by line voltage,thus the voltage compensation range is extended and the compensation can be realized while the voltage of each phase sags down by 37% of rated value or the voltage of one phase keeps its rated value and the voltages of other two phases sags down to zero.Based on the proposed scheme an experimental research on the control of inverter in three-phase four-wire system is performed in which the control strategy of triangle wave tracking and is used,and the result validates the correctness and effectiveness of the proposed scheme.