Abstract
The incorporation of real and reactive power control of solar photovoltaic (PV) inverters has received significant interest as an onsite countermeasure to the voltage rise problem. This paper presents a comprehensive analysis of the involvement of active power curtailment and reactive power absorption techniques of solar PV inverters for voltage regulation in medium voltage (MV) distribution networks. A case study has been conducted for a generic MV distribution network in Malaysia, demonstrating the effectiveness of fixed power factor control, Volt–Var, and Volt–Watt controls in mitigating overvoltage issues that have arisen due to the extensive integration of solar PV systems. The results revealed that the incorporation of real and reactive power controls of solar PV inverters aids in successfully mitigating overvoltage issues and support network operating conditions. Furthermore, the comparative analysis demonstrated the importance of employing the most appropriate control technique for improved network performance.
Highlights
In recent years, Distributed Energy Resources (DERs), such as solar photovoltaic (PV)systems, have made inroads into distribution networks, gaining a significant share of the generation mix
This paper evaluates the involvement of several active power curtailment (APC) and reactive power absorption (RPA) techniques of solar PV inverters, namely fixed power factor, Volt–Var, and Volt–Watt controls, in mitigating overvoltage problems due to high PV penetration in Malaysian medium voltage (MV) distribution networks
In the Volt–Watt control mode, PV inverters are allowed to monitor terminal voltage and curtail active power output based on the Point of Common Coupling (PCC) voltage, and the Volt–Watt setpoints defined by the utility
Summary
In recent years, Distributed Energy Resources (DERs), such as solar photovoltaic (PV)systems, have made inroads into distribution networks, gaining a significant share of the generation mix. The increasing levels and intermittent nature of solar PV systems impose a variety of implications in conventional PV-rich distribution networks, where voltage regulation has become a difficult task due to the presence of distributed supply points [1,2]. The overvoltage issues attributed to reverse power flow have been recognized as the key limiting factor for solar PV integration in distribution networks [3,4]. In order to maintain grid voltage levels within the specified boundaries, the Distribution Network Operators (DNOs) that guarantee the power quality of the distribution network are required to enforce restrictions on the integration of new PV systems into the distribution grid, and to undertake network reinforcement, which would eventually lead to massive capital investments. It is of vital importance to propose effective mitigation strategies, focusing on a smooth operation and optimal PV penetration
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