基于有限时间一致性的混合微电网分层控制

Hierarchical Control for Hybrid Microgrid Based on Finite-time Consensus Control

考虑混合微电网中存在未知线路阻抗,导致有功功率共享精度低的问题,提出了混合微电网分层控制方法。底层控制包括交、直流子微网与双向功率变流器(BPC)的下垂控制,用于确保有功功率共享的迅速响应,并维持频率、电压的平衡。上层控制基于有限时间一致性算法构造频率、电压修正量,调整交、直流子微网的输出有功功率,在有限时间内使各子微网的输出有功功率比例收敛一致。最后,搭建含3个子微网的实验平台验证所提控制方法的有效性。实验分析表明,分层控制方法能够使混合微电网精确地共享功率,在负荷扰动、子微网投退等不同工况下具有良好的控制性能,与传统渐进一致性算法相比,提高了收敛速度。

Considering the unknown line impedance in hybrid microgrid,which leads to problem of low active power sharing accuracy,a hybrid microgrid hierarchical control method is pro posed.The lower layer control includes the droop control of AC and DC sub-microgrids and bidirectional power converters(BPC),which is used to ensure the rapid response of active power sharing and maintain the balance of frequencies and voltages.The upper layer control constructs the frequency and voltage corrections based on the finite-time consensus algorithm to adjust the output active power of AC and DC sub-microgrids,and converge the output active power proportion of each sub-microgrid in a finite time.Finally,an experimental platform contains three sub-microgrids is built to verify the effectiveness of the proposed control method.The experimental analysis shows that the hierarchical control method can make the hybrid microgrid share power accurately,has good control performance under different operating conditions such as load disturbance and sub-microgrids in or off,and improves the convergence speed compared with the traditional progressive consensus algorithm.