Control Strategy And Experimental Research of 10kV Power Quality Disturbance Integrated Device

A power quality disturbance integrated device is proposed which can simulate the voltage and current disturbance of the power system, the output of the device include voltage sag, voltage fluctuation and flicker, voltage harmonic, current harmonic, three-phase voltage and current unbalance and so on. The output of the device has good waveform, large power and high voltage level. The device adopts the multi-winding transformer + Voltage Source PWM Rectifier + cascade multilevel inverter structure. The control strategy of the PWM Rectifier is dual-loop control, with good input current waveform and stable dc voltage. Based on carrier phase shift cascade multi-level inverter, the control strategy of the inverter is voltage feed-forward with repetitive learning, and the high accuracy output is achieved with the high precision output waveform. A simulation model based on PSCAD/EMTDC software platform is developed and the 1.5MVA/10kV Power quality disturbance integrated device is developed. Simulation and experimental results verify the correctness of the main circuit topology and control strategy.