This study presents a novel voltage control strategy for low voltage (LV) distribution grids, addressing the lack of coordination between photovoltaic (PV) reactive control and energy storage system (ESS) active control. The proposed strategy concentrates on group coordination of PV and ESS to improve LV grid performance.
In low-voltage distribution networks, the method of controlling reactive power to regulate voltage is less effective due to the large distribution network line impedance ratio R/X. Controlling the active power output from distributed PV can provide better voltage regulation.
Initially, a control strategy was suggested through a comparative analysis of the voltage cost sensitivity factor (VCSFs) associated with the PV system and the ESS. This strategy emphasized the prioritized use of reactive power from the PV for voltage regulation, followed by the utilization of active power from the ESS for the same purpose.
Hence, in instances of voltage deviations, the suggested approach is to prioritize the utilization of PV reactive power for voltage regulation, followed by tapping into the active power reserves of the ESS for further voltage control measures. 2.2.2. Voltage cost sensitivity factor for different nodes
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