Abstract
As the interconnection of renewable-energy-based distributed generations (DGs) to the distribution system increases, the local and temporary voltage and current problems, which are difficult to resolve with the existing operation method, are becoming serious. In this study, we propose a short-term operational method that can effectively resolve voltage and current violations caused by instantaneous output fluctuations of DGs in a system with a high hosting capacity of renewable energy sources. To achieve the objectives, a modified heuristic network reconfiguration method, and a method determining the maximum power output limit of individual DGs are proposed. We propose a cooperative method for controlling the power output fluctuations of renewable-energy-based DGs, which includes voltage control, network reconfiguration, and power curtailment. The proposed algorithm was verified through case studies by using a test system implemented in MATLAB environments. It can effectively resolve violations caused by DGs while minimizing the number of switching operations and power curtailment. The proposed method is an appropriate operation method to be applied to the real system as it can cope with the instantaneous output fluctuation of DGs, which was not dealt with in the existing operation method.
Highlights
Renewable energy sources (RESs) have been increasingly used in electric power systems to reduce the consumption of fossil fuels and greenhouse gas emissions
The real-time output fluctuation of RESs, which was difficult to respond with existing operation methods, becomes a greater risk to the operation of the distribution system as the hosting capacity (HC) increases
We proposed a short-term operation method to effectively resolve the congestion in a distribution system with high HC, combining the methods of voltage control, network reconfiguration, and distributed generations (DGs) curtailment
Summary
Renewable energy sources (RESs) have been increasingly used in electric power systems to reduce the consumption of fossil fuels and greenhouse gas emissions. RESs introduce new problems to the distribution system, such as overvoltage, overcurrent, and protection coordination failure [1]. The conventional distribution network has been designed with a fit-and-forget approach, assuming the worst scenario at the planning stage; it does not require special controls [2]. Additional system infrastructure is required to address the problems introduced by the increased use of RESs. infrastructure reinforcement requires large investments and new site locations to expand and install new lines or facilities. It is difficult to secure new sites because of opposition from residents or environmental problems. Countermeasures must be taken to enhance the penetration rate of renewable energy generation with minimal investments in additional infrastructure
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