Abstract
This paper proposes a stochastic economic dispatch (SED) model for hydro-thermal-wind-photovoltaic power system (HTWPPS) considering mixed coal-blending combustion (MCBC) to improve the operational efficiencies of thermal power units (TPUs) with deep peak-regulating operation (DPRO). Firstly, the rations for different types of coal can be acquired by meeting the operational requirements of boilers. Three functions including the cost of coal consumption, polluting gas emission, and the life loss cost for TPUs could be obtained by fitting coal quality. Besides, they would be strictly piecewise linearized, respectively. Consequently, the objective function involving the above three kinds of costs as well as the cost of oil injection can be presented. Secondly, there is a two-stage framework for reducing the coupling of HTWPPS and improving the solving efficiency. In the first stage, the Monarch Butterfly Optimization (MBO) algorithm is employed for obtaining the power outputs of hydro-power units (HPUs) taking the minimum water consumption as the objective. In the second stage, the load curve can be updated according to the results from the first stage. Besides, the Latin Hypercube Sampling method and the backward scene reduction technique are utilized to acquire a set of scenarios of wind power. In this way, the SED model considering MCBC can be achieved. The case studies have been carried out on a simplified provincial power system in China with the help of MATPOWER and CPLEX. The results show that the proposed model can effectively increase the economic and environmental benefits for TPUs.
Highlights
Renewable energy sources (RESs) have numerous benefits over the conventional energy generation sources, because they are clean energy with zero emissions [1,2,3]
It is well known that coal consumption is a critical indicator for assessing the energy conservation and emission reduction of thermal power units (TPUs), which is mainly affected by coal quality
Taking a simplified provincial power system in China as an example, the results suggest that mixed coal-blending combustion (MCBC) can reduce the cost of coal consumption and total emission of polluting gas in the power system with deep peak-regulating operation (DPRO), and may improve the operational efficiencies of thermal power plant (TPP)
Summary
Renewable energy sources (RESs) have numerous benefits over the conventional energy generation sources, because they are clean energy with zero emissions [1,2,3]. For improving the peak-shaving capacities and operational efficiencies for coal-fired units, the cost function related with DPRO was presented for the multi-angle economic analysis of those units with plasma ignition and oil injection [13]. These studies had not considered the influence of coal quality on the economy and environmental conservation of power system. The contributions of this paper are 1) A SED model for HTWPPS with MCBC is proposed, which presents a new idea for the TPPs with DPRO to reduce their costs and raise their efficiencies.
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