Abstract
This paper investigates the operation of each power conversion system (PCS) for efficient energy management systems (EMSs) of microgrids (MGs). When MGs are linked to renewable energy sources (RESs), the reduction in power conversion efficiency can be minimized. Furthermore, energy storage systems (ESSs) are utilized to manage the surplus power of RESs. Thus, the present work presents a method to minimize the use of the existing power grid and increase the utilization rate of energy generated through RESs. To minimize the use of the existing power grid, a PCS operation method for photovoltaics (PV) and ESS used in MGs is proposed. PV, when it is directly connected as an intermittent energy source, induces voltage fluctuations in the distribution network. Thus, to overcome this shortcoming, this paper utilizes a system that connects PV and a distributed energy storage system (DESS). A PV-DESS integrated module is designed and controlled for tracking constant power. In addition, the DESS serves to compensate for the insufficient power generation of PV. The main energy storage systems (MESSs) used in MGs affect all aspects of the power management in the system. Because MGs perform their operations based on the capacity of the MESS, a PCS designed with a large capacity is utilized to stably operate the system. Because the MESS performs energy management through operations under various load conditions, it must have constant efficiency under all load conditions. Therefore, this paper proposes a PCS operation algorithm with constant efficiency for the MESS. Utilizing the operation algorithm of each PCS, this paper describes the efficient energy management of the MG and further proposes an algorithm for operating the existing power grid at the minimum level.
Highlights
The system configuration of a microgrid (MG) can be categorized into three types: AC MGs, DC MGs, and AC/DC hybrid MGs [1]
This paper proposes an energy management systems (EMSs) for reducing the operating cost of MGs by increasing the utilization rate of renewable energy sources (RESs) and minimizing the use of the conventional power grid through the MG EMS
Was 60%the at disadvantages the time of anand inverter operation. This experiment, an inverter operation was performed by utilizing the main energy storage systems (MESSs); when the were supplemented
Summary
The system configuration of a microgrid (MG) can be categorized into three types: AC MGs, DC MGs, and AC/DC hybrid MGs [1]. The proportion of renewable energy sources (RESs) in existing power systems has been gradually increasing. The proportions of photovoltaics (PV) and wind turbines (WTs) are the greatest [2]. Due to the recent increase in load and intermittent energy sources, such as PV and WTs, batteries are concurrently used [6,7]. By reducing the steps of power conversion, a system configuration with DC MG has many advantages in terms of energy efficiency. Systems are being upgraded to DC MGs and AC/DC hybrid MGs to reduce the power conversion loss
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