Abstract
Operation scheduling is one of the most practical optimization problems to efficiently manage the electric power supply and demand in microgrids. Although various microgrid-related techniques have been developed, there has been no established solution to the problem until now. This is because the formulated problem becomes a complicated mixed-integer programming problem having multiple optimization variables. The authors present a framework for this problem and its effective solution to obtain an operation schedule of the microgrid components considering their coordination. In the framework, trading electricity with traditional main power grids is included in the optimization target, and uncertainty originating from variable renewable energy sources is considered. In the solution, the formulated problem is reformulated to reduce the dimensions of its solution space, and, as a result, a combined algorithm of binary particle swarm optimization and quadratic programming is applicable. Through numerical simulations and discussions of their results, the validity of the authors’ proposal is verified.
Highlights
Microgrids are used in electric power grids to manage a localized group of power sources and loads that can operate in both connecting and disconnecting to the traditional main power grids [1,2,3]
In Cases 1 and 2, the numerical simulations succeeded within a few minutes
This paper presented a problem framework and its effective solution to obtain an operation schedule to coordinate microgrid components considering
Summary
Microgrids are used in electric power grids to manage a localized group of power sources and loads that can operate in both connecting and disconnecting to the traditional main power grids [1,2,3]. Since the VREGs, whose outputs strongly depend on the weather condition, take a significant portion of electrical power sources of microgrids, it becomes very difficult to manage the power supply and demand with few adverse effects on the main power grids [1,2,3,4,5,6,7,8,9]. If microgrid operators cannot maintain the balance of supply and demand, the resulting electricity surplus/shortage must be compensated by trading electricity with an extra payment to the main grids, called imbalance penalty. These are reasons why an operation scheduling method for the microgrids is crucially required
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