Abstract
This paper introduces a novel local Volt/var control strategy in a low-voltage smart grid. Nowadays, various Volt/var local control strategies built on customer photovoltaic inverters, e.g., cosφ(P) and Q(U), are introduced to mitigate the upper voltage limit violations in feeders with high prosumer share. Nevertheless, although these strategies are further refined by including more local variables, their use is still very limited. In this study, the effects of a new concentrated Volt/var local control strategy in low-voltage grids are investigated. Concentrated var-sinks, e.g., coils-L(U), are set at the end of each violated feeder. The concentrated local control strategy L(U) is compared with the distributed cosφ(P) and Q(U) strategies. Initially, both control strategies are theoretically investigated, followed by simulations in a test feeder. Finally, the expected practical significance of the findings is verified through simulations in a real typical urban and rural grid. Additionally, the impact of the different local control strategies used in low-voltage grids on the behavior of the medium-voltage grid is analyzed. The results show that the concentrated Volt/var control strategy eliminates the violation of upper voltage limit even in longer feeders, where both distributed local strategies fail. In addition, the concentrated L(U) local control causes less reactive power exchange on the distribution transformer level than the distributed cosφ(P) and Q(U) strategies. Therefore, the reactive power exchange with the medium-voltage grid and thus the distribution transformer loading are smaller in the case of concentrated local control strategy.
Highlights
Technological progress has led to a rapid growth of the use of distributed photovoltaic electricity production
P and Q are the active and reactive power provided by inverter; cosφ is the power factor set at inverter level; U is the voltage of the feeder bus where the inverter is connected
Distributed are applied to reactive power devices (e.g., PV-inverters), which are connected to various locations are applied to reactive power devices (e.g., PV-inverters), which are connected to various locations throughout the the length length of of the the feeder feeder in in order order to to mitigate mitigate the the violation violation of of the the upper upper voltage voltage limit
Summary
Technological progress has led to a rapid growth of the use of distributed photovoltaic electricity production. P and Q are the active and reactive power provided by inverter; cosφ is the power factor set at inverter level; U is the voltage of the feeder bus where the inverter is connected We discuss the effectiveness of distributed concentrated Volt/var local control strategies in LVG in three cases. Their theoretical behavior versus concentrated Volt/var local control strategies in LVG in three cases Their theoretical is analyzed and compared in a very simplified model. Impact of both control strategies on the reactive power exchange of an urban and rural real grid is Thirdly, the impact of both control strategies on the reactive power exchange of an urban and rural explored and compared Their effect on the medium-voltage grid (MVG) is analyzed.
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