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Safety Output Model with Tight Constraints and Flexible Regulation for Nuclear Power Plant Participating in Peak Load Regulation
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Guangxi Key Laboratory of Power System Optimization and Energy Technology (Guangxi University), Nanning 530004, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51667003).

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    Abstract:

    With the increasing proportion of nuclear power and intermittent power supply, nuclear power plant (NPP) is facing higher peak-shaving pressure. Since the present mathematical models of NPP participating in peak load regulation are imperfect, a peak-shaving safety output model for NPP is proposed, which effectively unifies the specific safety requirements and flexible regulation patterns of NPP. By means of compacting the constraints and making the peak regulating depth continuous, the shortcomings of the existing models in general applicability, economy and flexibility could be solved. To guarantee accurate safety output under various operation conditions, the feasible region of nuclear power output is shrunk by introducing decoupled auxiliary variables of power up/down and fully considering the coupling characteristics and mutex relationship between power changes. In addition, regulating depth is made to be continuous in order to obtain the optimal regulating depth and time, which increases the flexibility of peak regulating operation mode for NPP. The model could be easy to solve because the non-linear term is equivalently transformed into linear by using the math transformation technique. The simulation results, which verify the validity of the model, show that the proposed model can accurately, flexibly and economically arrange the peak-shaving safety output of NPP and reduce about 5% peak regulating depth and 18% peak regulating cost.

    表 9 Table 9
    表 2 3种模型的对比Table 2 Comparison of three models
    表 3 原模型中取值为1的运行标志位Table 3 Running flags valued 1 in original model
    表 6 Table 6
    表 17 Table 17
    表 13 Table 13
    表 16 Table 16
    表 5 Table 5
    表 7 Table 7
    表 14 Table 14
    表 10 Table 10
    表 8 Table 8
    表 1 核电机组运行标志Table 1 Running flags of nuclear power unit
    表 11 Table 11
    图1 德国某些核电机组调峰实例Fig.1 Peak shaving examples of some nuclear power units in Germany
    图2 调峰深度离散的核电机组调峰出力Fig.2 Peak load regulation output of nuclear power unit with discrete regulating depth
    图3 调峰深度连续的核电机组调峰出力Fig.3 Peak load regulation output of nuclear power unit with continuous regulating depth
    图4 原模型与改进模型3 h安全出力的对比Fig.4 Comparison between 3-hour safety outputs of original model and improved model
    图5 3种安全出力模型的对比Fig.5 Comparison of three safety output models
    图6 考虑升降时间相等约束的安全出力Fig.6 Safety outputs considering constraints of equal regulating time
    图 约束不紧凑区域Fig. Uncompact region of constraints
    表 12 Table 12
    表 15 Table 15
    表 4 模型2与模型3的比较Table 4 Comparison between model 2 and model 3
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LI Zhaoyu,WEI Hua,HU Hong.Safety Output Model with Tight Constraints and Flexible Regulation for Nuclear Power Plant Participating in Peak Load Regulation[J].Automation of Electric Power Systems,2020,44(4):63-71.DOI:10.7500/AEPS20190312007

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History
  • Received:March 12,2019
  • Revised:June 05,2019
  • Adopted:June 11,2019
  • Online: February 25,2020
  • Published: