Abstract
The matching characteristics of wind power output and nuclear power peak shaving are studied and the influence of coordinated dispatching of wind power and nuclear power on peak shaving flexibility and cost of the power grid is analyzed. Taking the lowest total operation cost of the system as the objective and considering the operation constraints, peak shaving cost of nuclear power units and the abandoned wind cost, a multi-power dispatching model for power system is proposed. In addition, in order to accurately optimize the output of nuclear power, a method of subdividing the peak shaving depth of nuclear power to linearize the constraint of nuclear power peak shaving is proposed. The analysis of example shows that the multi-power dispatching model considering the coordinated operation of wind and nuclear power has a high operation economy and can significantly reduce the amount of wind abandonment. The daily load tracking mode can be used for the participation of nuclear power units in daily peak shaving and the feasibility and necessity of coordinated wind-nuclear dispatching are verified.
Highlights
In recent years, with the increasing tension of the world’s energy supply and the increasingly severe climate and environmental problems, vigorous development and consumption of clean energy has become the consensus of the world’s energy and power industries [1,2]
(a) Model 1: Nuclear power units operate with base load and no wind abandonment is allowed. (b) Model 2: Nuclear power units operate with base load and wind abandonment is allowed. (c) Model 3: Nuclear power units can participate in peak shaving in daily load tracking mode and no wind abandonment is allowed. (d) Model 4: Nuclear power units can participate in peak shaving in daily load tracking mode and wind abandonment is allowed, that is the dispatching model proposed in this paper
The following four modes are set for simulation and comparison. (a) Mode 1: Nuclear power units are operated with base load and do not participate in daily peak shaving. (b) Mode 2: Nuclear power unit participates in daily peak shaving with 100 MW out-pressure. (c) Mode 3: Nuclear power units use three fixed peak shaving depths for daily load tracking and peak shaving [43]
Summary
With the increasing tension of the world’s energy supply and the increasingly severe climate and environmental problems, vigorous development and consumption of clean energy has become the consensus of the world’s energy and power industries [1,2]. The dispatching model with nuclear power participating in peak shaving can be established based on the cost and safety constraints of nuclear power peak shaving [29,30,31]. On this basis, an optimal dispatching model for the combined operation of nuclear power and other conventional energy sources can be constructed [32,33,34]. In order to alleviate the peak shaving pressure of the power grid, reduce the frequent start-up and shutdown of conventional units and promote the absorption of wind power, this paper studies the multi-power joint optimal dispatching strategy, considering the participation of wind power and nuclear power. An example is given to analyze the economy of wind-nuclear coordinated dispatching and the impact of daily peak shaving mode on optimization results, which verifies the validity of the model and the method proposed
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