Research on Power Flow Calculation of Hybrid Injection Model Based on PV Grid connected Power System

A power flow calculation strategy with network parameters of PV stations is put forward, the interaction between PV station and power grid is taken into consideration, and power flow results of PV station and power grid are obtained through once calculation. As for PV grid connected power grid, PV station network simplification strategy is proposed to decrease network nodes and to reduce the scale of Jacobian matrix. When solving power flow equations, a N-R power flow calculation algorithm is put forward based on current/power hybrid injection model, which not only inherits the advantage that the non diagonal elements of PQ node block in Jacobian matrix keeping constant during the iteration of the conventional current injection model, but also reduces Jacobian matrix scale, which save the storage space. By considering of the hybrid coordinate issues of hybrid injection model, a coordinate conversion strategy is presented to convert the right parts of power flow equations to those in same coordinate, which make the power flow equations more orderly and more convenient to encode programs. In the end, by taking the IEEE30 system with a 4 PV arrays from a certain PV station in Qinghai is used as example, power flow calculation is performed based on the actual parameters to the feasibility of proposed algorithm.