Power Quality Improvement Device for Medium-Voltage Distribution Network

To improve the power quality of the distribution network sensitive load, a power quality improvement device for medium-voltage distribution network is developed, whose power unit and topology of charging circuit is designed and a fixed voltage slow closed loop control strategy is proposed. The control effect of the device for frequency fluctuation, voltage fluctuation, voltage flicker, voltage sag, and voltage short-time interruption, three-phase unbalance, harmonics, inter-harmonics, temporary overvoltage in medium-voltage distribution network is verified, and the quality of medium voltage distribution network power supply is improved.