Research On Power Coordinated Control Method For Microgrid Based On Consensus Protocol Of Multi-Agent

As an important component in the construction and research of smart grid,microgrid can effectively integrate all kinds of distributed generation technologies,and provide effective technical way for the large-scale application of new energy and renewable energy generation.However,the continuously growing number of intermittent power,such as wind power and photovoltaic power,and the random disturbance of the load power will affect the safe and stable operation of microgrid.In order to satisfy the real-time control of the power balance,it not only depends on adjustment ability distributed generation itself,but also needs a reasonable coordination between distributed generations.Therefore,the study of coordinated control on distributed power generation system in microgrid is significantly important.Firstly,this paper systematically analyzes control methods of grid-connected inverter and control strategies of microgrid system.On this basis,this paper studies the consistency of multi-agent system,and proposes to introduce the consensus protocol into the coordination control of microgrid according to the autonomous,distributed and cooperative characteristics of agent.After that,in allusion to the coupling problem of active and reactive power PV output when accessed to distribution low-voltage microgrid,as well as overcoming the influence of line impedance and local load on the voltage of grid connection node,this paper proposes a Q'-U virtual power droop control method based on multi-agent consensus protocol considering maximum power point tracking.Through the coordination of the active and reactive power PV output,the voltage quality of PV grid connection node is improved.Finally,Fully considering the effect of line impedance on power allocation,and based on establishing multi-agent structure of virtual leader in DC microgrid,this paper proposes a novel adaptive droop control method based on consensus protocol of multi-agent for DC microgrid consisting of multiple distributed generations,which can obtain reasonable power allocation,ensure voltage stability and improve dynamic response capacity of DC microgrid through adjusting the value of virtual impedance in real time and dynamically according to loads condition,local and neighbor set voltage information.Simulation results show that the proposed methods can achieve precise coordination control of power,enhance the controllability of microgrid,which is conducive to the security,stability and quality of microgrid.