Local Coordination of Distributed PV-BESS for Grid Voltage Regulation

To mitigate bus voltage violations in active distribution networks, this article proposes a local coordinated voltage regulation (VR) algorithm involving distributed photovoltaic (PV) and battery energy storage system (BESS). First, a sequential coordination mechanism of reactive power compensation (RPC) of PV followed by active power compensation (APC) of BESS is designed. Then, the available maximum RPC capacity and the required minimum APC capacity are computed in turn based on the exact VR requirement of a selected crucial bus. Afterward, a capacity-based proportional RPC-APC control is adopted to keep each PV or BESS in a consistent controllable state, thereby preventing repeated parameter updates and extensive iterations. The algorithm only requires control of local PV and BESS on the buses experiencing voltage issues, which leads to a fairer sharing of the VR burden. Finally, the effectiveness is validated through the case study in a real grid scenario.