To address this problem, this paper presents a coordinated control method of distributed energy storage systems (DESSs) for voltage regulation in a distribution network. The influence of the voltage caused by the PV plant is analyzed in a simple distribution feeder at first.
In terms of research on PV participation in distribution voltage regulation, refs. [ 13, 14] dynamically adjust the voltage at the grid connection point based on PV inverters’ reactive power compensation capability.
In distributed voltage control, the distribution network with EVs and PVs connected is first partitioned into several regions based on the similarity of bus voltage sensitivity. Then, regional voltage control is applied to each regional distribution network via the active and reactive power control of their member EVs and PVs [ 34, 35 ].
Some major standards for PV integration in distribution systems such as IEC 61727, IEEE 1547, and VDE-AR-N4105 are defined and used in to ensure that the power quality and stability defined by grid codes for PV sources connected to the grid are maintained.
The traditional distribution network has multiple voltage regulation methods, such as on-load tap changer (OLTC) , reactive power regulator . However, these methods cannot always regulate the voltage flexibly and effectively, because the voltage is different from the network without PV.
The SEGCC specifies the special requirements for connecting both Medium-Scale Solar Plants (MSSPs) and Large-Scale Solar Plants (LSSPs) to the distribution networks or to the transmission network according to the capacity of the solar power plant. The capacity of MSSPs’ range is from 500 kW to less than 20 MW.