Control Strategy of Interlinking Converter in Hybrid Microgrid based on Line Impedance Compensation

In order to solve the problem of power deviation caused by voltage drop of line impedance, a control strategy of interlinking converter (IC) in hybrid microgrid based on line impedance compensation is proposed. In this method, one specified harmonic signal whose frequency is closely related to the voltage of point of common coupling (PCC) is injected into IC. The harmonic frequency is obtained by the usage of a filter and phase-locked loop at the ac side of IC, and the line impedance is obtained consequently. Compensating the voltage drop with the estimated line impedance, and the accurate power transmission can be realized. Finally, simulation results verify the effectiveness of the proposed method.