Abstract
The optimized dispatch of different distributed generations (DGs) in stand-alone microgrid (MG) is of great significance to the operation’s reliability and economy, especially for energy crisis and environmental pollution. Based on controllable load (CL) and combined cooling-heating-power (CCHP) model of micro-gas turbine (MT), a multi-objective optimization model with relevant constraints to optimize the generation cost, load cut compensation and environmental benefit is proposed in this paper. The MG studied in this paper consists of photovoltaic (PV), wind turbine (WT), fuel cell (FC), diesel engine (DE), MT and energy storage (ES). Four typical scenarios were designed according to different day types (work day or weekend) and weather conditions (sunny or rainy) in view of the uncertainty of renewable energy in variable situations and load fluctuation. A modified dispatch strategy for CCHP is presented to further improve the operation economy without reducing the consumers’ comfort feeling. Chaotic optimization and elite retention strategy are introduced into basic particle swarm optimization (PSO) to propose modified chaos particle swarm optimization (MCPSO) whose search capability and convergence speed are improved greatly. Simulation results validate the correctness of the proposed model and the effectiveness of MCPSO algorithm in the optimized operation application of stand-alone MG.
Highlights
Under the dual pressures of global energy crisis and environmental pollution [1], distributed generations (DGs) have received more and more attention for its advantages of low pollution, high efficiency and flexible installation site [2,3,4]
Based on the fact that little variation (5% in this paper) in environmental parameters will not have a great impact on people’s comfort feeling, this paper proposed a modified parameters will not have a great impact on people’s comfort feeling, this paper proposed a modified dispatch strategy for micro-gas turbine (MT)’s combined cooling-heating-power (CCHP) mode, which is shown in Figure 2 (Take the situation of thermal load dispatch strategy for micro-gas turbine (MT’s) CCHP mode, which is shown in Figure 2 (Take the situation of thermal for example)
It is obvious that the load demand is higher on weekends because of the output of wind turbine (WT) and PV
Summary
Under the dual pressures of global energy crisis and environmental pollution [1], distributed generations (DGs) have received more and more attention for its advantages of low pollution, high efficiency and flexible installation site [2,3,4]. Microgrid (MG) is an autonomous system that can realize self-control, self-protection and self-management It could operate interconnected with the utility grid or in an islanded mode [16]. H. Vahedi applied the optimization model in a certain scenario and got the power output of every micro resource in each period [23]. The basic data from various operation environments would impact the performance of algorithm and model. To make full use of the CCHP to improve the whole benefit of the MG system, this paper proposed a modified strategy for MT to operate in a more economical way.
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