考虑非线性负荷接入的交直流混合配电网电能质量优化方法OA

In the AC/DC hybrid distribution network,with a large number of nonlinear loads accessing,the power quality has been seriously affected.For this reason,this paper proposes an optimization method for power quality of AC/DC hybrid distribution network considering nonlinear load access.Firstly,the minimum mean square adaptive algorithm is used to detect the voltage and current distortion of the common mode coupling nodes,so as to avoid high-order harmonic compensation errors.Secondly,by designing an interconnected conversion unit with voltage control,the voltage of each phase of the common mode coupling node is sinusoidal under the condition of nonlinear load.Finally,considering the effect of voltage control of the interconnection conversion unit on the distortion current at the common mode coupling node,the expected output current of the parallel unit is increased.The simulation results show that the voltage at the common mode coupling is basically sinusoidal,and the total harmonic distortion rate is reduced from 6.80%to 0.90%,which is 1.71%lower than that of the traditional control method.After the current optimization,the total harmonic distortion rate is reduced from 13.62%to 1.51%,which is 4.03%lower than that of the traditional optimization method.After optimization,the voltage and current basically meet the normal operation conditions of isolated island type AC/DC hybrid distribution network.Compared with the conventional method,the proposed method can effectively improve the power quality of AC/DC hybrid distribution network,realize the AC-DC bidirectional fundamental wave power sharing,and has lower equipment cost and better computational performance.