一种分布式系统的孤岛微电网无功功率分配算法

A Reactive Power Sharing Algorithm for Islanded Micro-grid Based on Distributed System

微网孤岛模式下由于线路阻抗分布不均衡,非线性负载等因素都会极大影响分布式电源(DG)对无功功率的分配控制,容易发生过流和过载故障从而降低供电可靠性。为此,依据分布式智能代理系统理论,把分布式电源看作智能代理,采用一阶动力学离散迭代方程依据状态估算误差设计通讯触发条件。通过李雅普诺夫稳定性分析方法提出一种基于分布式智能代理系统的孤岛微电网无功功率分配策略。最后通过MATLAB仿真验证了所提控制算法在微网孤岛模式下控制无功功率分配的有效性和可行性。

In islanded micro-grid due to the unbalanced distribution of line impedance,nonlinear load and other reasons have greatly limitations on the control of reactive power sharing.These factors are easy to cause over-current and over-load faults and worsen the liability of the islanded micro-grid.According to the theory of distributed intelligent agent system,each DG is regarded as an intelligent agent,and a communication event-triggered condition is designed by using the discrete iterative equation of first order dynamics according to the state estimation error.On the basis of Lyapunov stability analysis approach,a reactive power sharing algorithm for islanded micro-grid based on distributed intelligent agent system is proposed.Eventually,the feasibility and validity of the proposed control algorithm for reactive power sharing in islanded micro-grid are verified by the simulation of MATLAB.