Micro-grid reactive power sharing control method based on equivalent feed line theory

The invention discloses a micro-grid reactive power sharing control method based on an equivalent feed line theory, and the method can accurately achieve the reactive power equalization in a micro-grid. The inconsistency of a local load in the micro-grid and the mismatching of feed line parameters are main factors which cause the imbalance of inverter output reactive power. The method enables a network mismatching factor, which causes a reactive power equalization error, to be parameterized through the concept of an equivalent feed line at first, and calculates an equivalent feed line parameter in real time through employing feed line current sensing. The method sets virtual impedance secondly according to the obtained parameters, and effectively eliminates the reactive power equalization error through the compensation of the mismatching factor in a connection circuit. Compared with a conventional virtual impedance method, the method gives consideration to the factor of a local load, can make parameter adjustment for the change of the load, and achieves the accurate power equalization.