Abstract
The interconnection of multiple microgrids can form a microgrid cluster (MGC). The economic benefit and operation reliability of the whole system can be improved through the energy mutual-aid and coordination control between microgrids. This paper proposes a bi-level coordinated optimal dispatching strategy for microgrid clusters. The upper layer aims to minimize the operating costs of the microgrid cluster system and the power fluctuation of the tie lines. The exchange power and generation power of each sub-microgrid are coordinated and controlled, which are sent to the lower level model as scheduling instructions. The lower layer takes a single microgrid as the research object. By optimizing the output of power generation unit, the operation cost of single microgrid can be minimized. Iterative solution is adopted between the bi-level optimization models. In order to avoid the premature and local convergence of the algorithm in the optimization process, the improved artificial bee colony algorithm (ABC) is used to solve the objective function. Finally, simulation examples verify the effectiveness and feasibility of the proposed strategy.
Highlights
Upper Level Optimization ModelThe upper level optimization model of this paper is the microgrid cluster (MGC), and the objective function is established with the minimum operating cost of the MGC
Nowadays, the requirement for connecting the multiple microgrids, enhancing stability, improving energy management, optimization and promoting the ancillary services has received more and more attention
Various approaches are proposed for coordinated operation and management of microgrid cluster (MGC) distribution systems and different aspects of this concept are studied in the literature
Summary
The upper level optimization model of this paper is the MGC, and the objective function is established with the minimum operating cost of the MGC. The objective function of upper Level is as follows. The function f0 is the total operating cost of the MGC; CMG (t) and CPL (t) are the cost of operating and power exchange between the microgrid; Tis the dispatch period and t is time interval. PTL (t) is the exchange power on the MGC tie line during the t th time interval. The constraints include system power balance constraint, microgrid output constraints, and tie line power constraints. Pi (t) is the total output power of all distributed power sources of microgrid i during the t th time interval. The power output of the microgrid and tie line power constraint inequality are shown as follows. Are minimum and maximum power outputs of the ith microgrid. Is the maximum of the tie line power
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