Abstract
The existing distributed operation schemes for microgrids lack the ability to determine the power selling to the grid during normal operation mode and are unable to provide service reliability to critical loads, during islanded operation mode. In order to overcome these issues, in this study, we have proposed a distributed operation method for both grid-connected and islanded modes of microgrids. Unlike the existing studies, where the utility grid is considered as a dispatchable generator, the bi-directional flow of power with the grid is considered in this study. Similarly, different load agents are considered for different priority loads to assure the service reliability to the critical loads during islanding. A two-step operation method is proposed for both grid-connected and islanded mode operations. During the first step, each agent in the network shares information with its neighboring agents to determine the total load and available renewable power in the network. Whereas, in the second step, each agent in the network determines the optimal operation points based on the local information received from the neighboring agents. Moreover, a modified cost function for the battery is also proposed in this study, which utilizes the information of market price and load to enhance the battery operation. A comparison is made between the centralized method, conventional distributed method, and the proposed distributed operation method. Simulation results have proved the effectiveness of the proposed method for realizing distributed operation for microgrids in both grid-connected and islanded modes.
Highlights
The trend of adopting low carbon generation technology and high-efficiency devices in the power system has encouraged to adopt more renewable generation, distributed generation, and energy storage system
NUMERICAL SIMULATIONS In order to realize the effectiveness of the proposed distributed operation method, a microgrid network is considered as shown in Fig 3 and 4 for grid-connected and islanded
A novel distributed operation method for a microgrid network has been proposed in this study
Summary
The trend of adopting low carbon generation technology and high-efficiency devices in the power system has encouraged to adopt more renewable generation, distributed generation, and energy storage system. Most of the existing studies have focused on the distributed operation of islanded microgrids [6], [8], [19] where the power trading with the utility grid is not possible. In case of connection failure with the main grid, the microgrid network operates in an islanded mode and load shedding is performed because of power shortage. In existing studies, the algorithms proposed for the distributed operation of grid-connected microgrid lacks the ability to determine power selling to the main grid [21]–[23]. In the existing studies [9], [10], [20], the cost functions of battery utilize the information of SOC and/or charging/discharging power only This information is not enough and limits the battery’s operation.
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