Technology of Weak Node Identification of Grid-Connected Photovoltaic and Energy storage System

The effect of stability on reliability is a complicated problem of power system operation, and this issue has not yet been paid enough attention to the relevant research. Aiming at the problem of weak node based on voltage stability, This paper presents a method to evaluate the reliability and the weak points of optical storage and grid connected system from the angle of node voltage. Proposed the two identification of Minimum Voltage and Bus Voltage Change of the power system is the most weak node voltage indicators. This paper proposes node two description of voltage drop expectation and node voltage expectation of load node and system reliability of node voltage expectation index. And the probability of the weakest node is selected and sorted, and this can provide the risk information for the system operators to provide the uncertainty of load growth. The validity and consistency of the proposed method are verified by the analysis of the IEEE30 node system which is added to the photovoltaic energy storage unit.