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Abstract
The large-scale electric vehicles connected to the microgrid have brought various challenges to the safe and economic operation of the microgrid. In this paper, a hierarchical microgrid dispatching strategy considering the user-side demand is proposed. According to the operation characteristics of each dispatch unit, the strategy divides the microgrid system into two levels: source-load level and source-grid-load level. At the source-load level, priority should be given to the use of the renewable energy output. On the basis of considering the user demand, energy storage, electric vehicles, and dispatchable loads should be utilized to maximize the consumption of the renewable energy and minimize the user’s electricity cost. The source-grid-load level can smooth the tie-line power fluctuation through dispatching of the power grid and diesel generators. Furthermore, the study presents a modified MOEA/D algorithm to solve the hierarchical scheduling problem. In the proposed algorithm, a modified Tchebycheff decomposition method is introduced to obtain uniformly distributed solutions. In addition, initialization and replacement strategies are introduced to enhance the convergence and diversity. A wind-photovoltaic-diesel-storage hybrid power system is considered to verify the performance of the proposed dispatching strategy and the modified algorithm. The obtained results are compared with other dispatching approaches, and the comparisons confirm the effectiveness and scientificity of the proposed strategy and algorithm.
Highlights
With the shortage of global resources and the aggravation of ecological pollution, countries all over the world begin to take the microgrid as an important supplement for the operation of the main network [1]
We study the economic scheduling problem of the wind turbines (WTs)-photovoltaic arrays (PVs)-diesel generators (DGs)-energy storages (ES) microgrid system, which takes into account V2G and the dispatchable load
Referring to a real microgrid system in the central region of China, the output of the wind turbine and photovoltaic arrays and the total load are shown in Figure 3, in which the dispatchable load is 10% of the total load. e system contains two diesel generators with a capacity of 0.6 MW and 0.8 MW, respectively, 1 MW lead-acid batteries for energy storage, and 700 EVs with a battery capacity of 24 kw·h
Summary
With the shortage of global resources and the aggravation of ecological pollution, countries all over the world begin to take the microgrid as an important supplement for the operation of the main network [1]. Qiu et al [18] considered the cost of the interruptible load and proposed a scheduling model with the objective function of power grid economic optimization. Based on the above background and research results, this paper proposes a microgrid hierarchical dispatching strategy containing wind turbines (WTs), photovoltaic arrays (PVs), diesel generators (DGs), schedulable loads, and EVs. In the microgrid system, the hierarchical strategy gives full consideration to the influence of the user demands on the economic operation. The hierarchical strategy gives full consideration to the influence of the user demands on the economic operation It uses the modified MOEA/D algorithm to solve the problem. In order to solve the economic optimization problem of this complex microgrid system, this section proposes a hierarchical scheduling strategy considering the interests of multiple stakeholders and the characteristics of distributed power supply. The compromise optimal solution is selected to discuss the results
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