张学军,许博,张一非,景江帆.基于小交流信号注入的接口变换器二次控制方法[J].电测与仪表,2019,56(18):141-147. zhang xue jun,xubo,zhang yi fei,jing jiang fan.Two-time control method of interface converter based on small AC signal injection[J].Electrical Measurement & Instrumentation,2019,56(18):141-147.
基于小交流信号注入的接口变换器二次控制方法
Two-time control method of interface converter based on small AC signal injection
In AC/DC hybrid microgrid, the Bidirectional interface converter plays an important role in the stable operation and power distribution of the system as a bridge connecting the AC subnet and the DC subnet. At present, the bidirectional Droop control method, which uses DC bus voltage and AC bus frequency to measure the power demand of DC and AC micro-grid and control the power flow, is widely used in the control of bidirectional interface converter, however, this method can make the voltage and frequency of the converter output deviate. At the same time, in practice, the parameters and output impedance of each converter will not be exactly the same, which will also cause the power distribution between the parallel converters is not accurate. In order to solve these problems, a two-time control method for small AC signal injection is proposed, in which the frequency and the droop bias of the fundamental voltage of the converter are the droop relation between the medium and small AC signals in the parallel converters as communication signals. The method can restore the voltage and frequency of the converter output to the rated value, and the power distribution between the parallel converters can be precisely made. Matlab/simulink Simulation Results Verify the effectiveness of the proposed method.
