DROOP CONTROL-BASED METHOD FOR ACCURATE DISTRIBUTION OF REACTIVE POWER OF MICRO-GRID

摘要

The present invention relates to the field of power system operation and control. Disclosed is a droop control-based method for accurate distribution of reactive power of a micro-grid. A distributed power supply in a micro-grid is mainly connected to a grid by means of an inverter interface, one of a plurality of inverters connected to the same bus in parallel is selected as a main control inverter, and local droop control parameters and line impedance from the inverter to a grid-connected point are transmitted to other inverters by means of a communication network. After other inverters obtain the parameters of the main control inverter, a local droop coefficient is adjusted according to droop control and a line characteristic constraint equation. Finally, the purpose of accurate distribution of reactive power is achieved. Different from conventional successive approximation adjustment, this method directly obtains output reactive power according to the droop control and the line characteristic constraint equation, and is thus simple, quick and reliable.