Abstract
The increased utilisation of distributed renewable energy sources in low voltage grids leads to power quality problems such as overvoltages and voltage unbalance. This imposes challenges to the distribution system operators to maintain the power quality in their grids. To overcome these issues, energy storage systems could be integrated together with the distributed energy resources and the stored energy could be used when needed to better improve power quality and achieve better grid performance. However, integrating an energy storage system introduces additional cost, therefore, determining the right capacity is essential. In this article, an energy storage system is combined with the classical positive-sequence control strategy and the three-phase damping control strategy. The three-phase damping control strategy is able to mitigate the voltage unbalance by emulating a resistive behaviour towards the zero- and negative-sequence voltage components. This resistive behaviour can be set on different values such that the desired voltage unbalance mitigation is achieved. Hence, the three-phase damping control strategy, equipped with the energy storage system is investigated under different values of the resistive behaviour. Both control strategies are investigated under the same conditions and the impact of the different capacities of the energy storage systems is investigated.
Highlights
Because of environmental and economical concerns, the share of the distributed energy resources (DRES) in the distribution grids is growing continuously
The considered scenario of testing the presented grid configuration of DRESs, solar irradiation and load profiles does not lead to undervoltages so neither the droop nor the battery energy storage systems (BESS) controllers are operating in the undervoltage region
The abbreviation SB stands for “slack bus” which is at the medium voltage side and LV stands for low voltage side which is after the distribution transformer
Summary
Because of environmental and economical concerns, the share of the distributed energy resources (DRES) in the distribution grids is growing continuously. The decreasing prices of the photovoltaic (PV) panels accelerates the penetration of DRES even more compared to previous years [1]. Due to the single-phase DRES and asymmetrical loading, the voltage unbalance decreases the hosting capacity of the low voltage (LV) feeders [2]. To overcome these issues, the DSO could reinforce the LV grids in which the problems occur but this is an incredibly expensive solution. The DSO could reinforce the LV grids in which the problems occur but this is an incredibly expensive solution Installing dedicated equipment such as distribution static
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