多谐波耦合下三相不平衡电网Boost变换优化控制

Optimal Control of Boost Transform in Three-phase Unbalanced Power Grid With Multi-harmonic Coupling

研究三相不平衡主动配电网的优化控制问题,可通过优化控制Boost变换器改善输出电压质量。依据小信号构造Boost变换器等效数学模型;在等效数学模型内添加动态补偿器,优化控制Boost变换器的输出电压与电流;通过粒子群算法优化动态补偿器的对称矩阵,提升优化控制效果。实验结果表明:该方法可快速有效优化控制Boost变换器的三相电压与三相电流;谐波次数不同时,应用该算法优化控制后,Boost变换器三相电压的电压谐波失真度均较低;出现负荷突增时,仍可快速优化控制输出电压,改善电压质量,降低电网有功损耗。

The optimal control problem of three-phase unbalanced active distribution network is researched.The output voltage quality can be improved by optimizing the control of Boost converter.The equivalent mathematical model of Boost converter is constructed according to small signal.A dynamic compensator is added to the equivalent mathematical model to optimize the output voltage and current of the Boost converter.The symmetry matrix of the dynamic compensator is optimized by particle swarm optimization algorithm to improve the optimal control effect.The experimental results show that this method can quickly and effectively optimize the three-phase voltage and three-phase current of Boost converter.When the number of harmonics is different,the voltage harmonic distortion of three-phase voltage of Boost converter is low after applying the algorithm to optimize the control.In case of sudden load increase,it can still quickly optimize and control the output voltage,improve the voltage quality and reduce the active power loss of the power grid.