A Method of Power Flow Analysis of Grid-Connected Photovoltaic and Energy Storage System Suitable for Active Distribution Network

At present, the power flow analysis algorithm of power system has not been paid enough attention. Aiming at the problem of low accuracy and slow speed of conventional power flow algorithm, this paper proposes a new method of Improved Bisection Searching Technique(IBST) for power flow analysis, which is suitable for the active power distribution network. This method is used to find the upper and nasal point of PV curves, and compared with the classical continuous flow method. The search method can improve the calculation accuracy and speed. The IBST can be used to determine the corresponding load growth rate for the first time when the system load flow is not convergent. And the algorithm can quickly identify the range of previous iteration convergence, but the next iteration does not converge. The effectiveness of the proposed method is verified by the analysis of the IEEE30 node system which is added to the photovoltaic energy storage unit.