Microgrid reactive power balanced allocation method based on impedance composite control

The invention provides a microgrid reactive power balanced allocation method based on impedance composite control. The technical scheme includes that the microgrid reactive power balanced allocation method includes: dynamically changing a droop coefficient in real-time by a dynamic Q-U droop coefficient adjuster according to outputted active power and reactive power of VSI (vertical speed indicator), adjusting VSI output impedance according to output current by Q-U droop control based on virtual impedance compensation, compensating voltage drop generated by virtual impedance by a virtual impedance open-loop compensator according to active power and reactive power, and controlling Q-U droop properties in a closed-loop manner via a PI (power integrations) adjuster by an impedance closed-loop compensator. The microgrid reactive power balanced allocation method has the advantages that voltage drop generated by the virtual impedance is compensated by open loop and closed loop, so that voltage sag generated by virtual impedance is avoided when output impedance is corrected; and mismatching of line impedance is eliminated by adopting a dynamic variable coefficient method and a transient state variable coefficient method, and dynamic and steady averaging properties of reactive power are improved.