Abstract
Microgrids are composed of distributed energy resources (DERs), storage devices, electric vehicles, flexible loads and so on. They may either operate connected to the main electricity grid (on-grid operation) or separated from the grid (islanded operation). The outputs of the renewable energy sources may fluctuate and thus can cause deviations in the voltage magnitudes especially at islanded mode. This may affect the stability of the microgrids. This paper proposes an optimization model to efficiently manage controllable devices in microgrids aiming to minimize the voltage deviations both in on-grid and islanded operation modes. RSE Distributed Energy Resources Test Facility (DER-TF), which is a low voltage microgrid system in Italy, is used to verify the algorithm. The test system’s data is taken through an online software system (REDIS) and a harmony search based optimization algorithm is applied to control the device parameters. The experimental results show that the harmony search based optimization approach successfully finds the control parameters, and can help the system to obtain a better voltage profile.
Highlights
Distribution systems are the key structures, which create a connection between transmission system and the consumers, in power systems
Conventional distribution systems used to satisfy most of the needs, distribution system operators (DSOs) are encountering many new problems due to the emergence of new technologies, such as integration of renewable energy resources, storage devices and electrical vehicles
This paper models the voltage deviation problem in microgrids utilizing harmony search algorithm
Summary
Distribution systems are the key structures, which create a connection between transmission system and the consumers, in power systems. It should be noted that previously given methods are applicable to small distribution systems or microgrids with a few number of DERs. In larger microgrids the number of controllable elements may be high and sudden changes in generation may yield unexpected voltage deviations. This paper will aim to solve of the voltage regulation problem of microgrid systems by using harmony search method. This paper models the voltage deviation problem in microgrids utilizing harmony search algorithm For this aim it needs to simulate the power flows on the microgrids both in isolated and grid connected operation modes. Several different number of control devices were optimally adjusted both using islanded operation modes and grid connected operation modes of the RSE Distributed Energy Resources Test Facility (DER-TF) microgrid test system.
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