Two-stage Reactive Power Optimization of Distribution Network with Random PV Output

As to such issues as the uncertainty of power output of PV and load, active power loss and voltage regulation brought by leaping transmission of reactive power, a two-stage reactive power planning model is proposed, whose objective is to minimize the power loss, leaping transmission of reactive power and the investment of the compensators. The model is solved by improved genetic algorithm. Normal vector of voltage stability limit surface is regarded as compensation alternative node to shorten region and time. The load flow and the node voltage margin are solved by probabilistic load flow combined with Latin hypercube. The effectiveness of the model and the algorithm are proved by the analysis and simulation of a modified Baran&Wu 33-bus distribution system.