Voltage Control Strategy of Distribution Network based on Coordinated Control of PV Inverter and SVG

With the increase of PV grid-connected capacity, the voltage stability becomes a severe problem. A usual solution is to install reactive power compensation equipment, however, the reactive power which is output by PV inverter itself is neglected. A novel voltage control strategy of distribution network based on spontaneous reactive power output by PV inverter and coordinated control of SVG is presented in this paper. By comparing the actual reactive power requirement with SVG output limit, the reactive power which was output by PV is depended, which could reduce the SVG investment and realize the maximum utility the PV power station to participate in the distribution network of reactive voltage regulation. To further verify the scheme, simulations of IEEE 33 nodes are done in MATLAB, and the effect is satisfactory.