Conventionally, the distribution network voltage regulation is in the charge of the local distribution network operator (DNO) and is conducted in a centralized way with the operational settings of OLTC transformers and SCBs globally optimized.
5. Conclusions Due to the intermittent power generation of distributed PV systems and the spatiotemporal uncertainty of uncontrolled EV charging, the accelerating grid penetration of EVs and PVs brings in severe voltage deviations and voltage fluctuations.
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 addition, in , to prevent overvoltage problems in power distribution networks, the use of the battery has an important role and three various scenarios for grid conditions, are tested as the voltage control mode, mitigating reverse power flow mode, and scheduling mode.
The PV systems and EVs act as supplementary voltage regulation resources. The PV systems are always grid-connected, and their voltage regulation capability is achieved using the device-level reactive power control, with the control range mainly determined by the operating power level (and hence the solar irradiation level).
Current power systems are not designed to support the massive integration of PV and to respond to the grid codes. The application of intelligent and online control methods for better coordination between all parts of modern electrical systems is very important.
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