Abstract
The use of battery energy storage system (BESS) is one of the methods employed in solving the major challenge of overvoltage, experienced on distribution networks with high penetration of photovoltaics (PV). The overvoltage problem limits the penetration levels of PV into the distribution network, and the benefits that could be gained. This study presents three loosely-related schemes for the coordination of multiple BESSs in such networks. Through the efficient selection, coordination and timing of charge and discharge operations of the BESS, the scheme maintains bus voltages within statutory ranges during periods of high PV power generation and high network load demand. Network segmentation was used in two of the schemes to encourage more even utilisation of the BESS in order to maximise the economic benefits of the BESS. The algorithms for the schemes were implemented and demonstrated on two different distribution networks. Simulation results showed that the schemes met the objectives of mitigating overvoltage and more even cycling of the BESSs during their operating lifetimes.
Highlights
The electricity network is currently undergoing transformative changes globally, as it transits from the more traditional structures that involve unidirectional power flow from large generating plants, often fossil fuel-powered, into more flexible structures
This paper presents three schemes that coordinate the operations of multiple battery energy storage system (BESS) installed on a network
The schemes in operation mitigated the occurrence of overvoltage as a result of high PV generation on the network
Summary
The electricity network is currently undergoing transformative changes globally, as it transits from the more traditional structures that involve unidirectional power flow from large generating plants, often fossil fuel-powered, into more flexible structures. A challenge with the transition from classical to so-called ‘smart grid’ is that the grid was not originally designed with these changes in mind The consequence of this is that technical complications arise, that must be dealt with, in the presence of increasing penetration of RES. Overvoltage, in particular, constitutes a major limitation to higher penetrations of PV in the network, especially because there are many periods with substantially higher PV generation levels when compared to consumption on the network Methods such as curtailment, use of reactive power injection and absorption, on-load tap changer operations and battery energy storage system (BESS) have been employed to solve these technical challenges [2]. This paper presents three schemes that coordinate the operations of multiple BESSs installed on a network. This model has been chosen because it captures the characteristics of the battery that are of interest
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