Cloud Energy Internet Based High Optimum Control of Residential ESS-PV Inverters in Local Power Systems

Abstract

Alternating direction method of multipliers (ADMM) is effective for addressing optimal power flow (OPF) convex optimization. However, ADMM significant drawback is absence of guaranteed convergence. Considering OPF interactions resulting from the unstable voltage relationship among energy storage system-photovoltaic (ESS-PV) inverters, a steady state voltage security area is established for these inverters. To assess the voltage security margin between the operational state and the security boundary, a voltage excursion indicator is proposed for processing OPF within the local area. The proposed approach enables a fully guaranteed convergence and optimized power flow within a decentralized distributed energy management framework, systematically via multiblock ADMM handling of large-scale and distributed data via energy internet. This approach guaranteed convergence of OPF via local consensus control by distributed ESS-PV systems with energy internet via all-to-all communication between centralized energy managers and inverters. Simulation results show the effectiveness of proposed approach.