下垂控制微电网容错运行的弹性控制框架

提出了一种下垂控制微电网客错运行的弹性控制框架,该框架以一种经济有效的方式实现功率控制.针对微电网中考虑非线性滤波电感的功率控制问题,提出了一种无传感器控制策略.首先,提出了一种虚拟通量模型用来估算输出电压信号,以取消实际电压传感器;然后,分析了非线性滤波电感对电压估计精度的影响,提出了一种基于鲁棒观测器的VF方法来消除这种影响.此外,通过在功率控制和电压控制回路中引入电压估计,提出了一种基于鲁棒观测器的无电压传感器下垂控制方法.仿真结果表明,所提出的控制策略能够在不使用电压传感器的情况下实现理想的功率控制性能.该控制器具有较好地抑制非线性电感影响的能力,提高了系统的可靠性,降低了微电网的设计成本.

A resilient control framework of droop-controlled microgrids for fault-tolerant operation

This paper presents a resilient control framework to implement power control in a cost-effective way.Sensorless control strategy is developed to perform desirable power control in microgrids considering nonlinear filter inductors.A virtual flux (VF) model is first established to estimate output voltage signal so that practical voltage sensors can be removed.Then,the effect of nonlinear filter inductor on voltage estimation accuracy is analyzed,and a robust observer-based VF method is developed to mitigate this effect.Furthermore,a robust observer-based voltage sensorless droop control method is developed by adopting voltage estimation in power control and voltage control loops.Simulation results show that the proposed control strategy is able to perform desirable power control performance without using voltage sensors.And the proposed controller has a sound capability to mitigate the effect of nonlinear inductor,which thus improves system reliability and reduces design cost of microgrid.