多模块高温气冷堆热功率的分层动态矩阵控制
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摘要
多模块高温气冷堆(MHTGR)核电站是具有固有安全性和多用途特点的先进核电站,采用多个核蒸汽供应系统(NSSS)驱动常规岛负载装置,实现并网发电、电网调频和吸纳可再生能源。随着核蒸汽供应系统数量的增加,特别是当核电站运行在负荷跟踪模式时,操作员很难手动将核岛热功率指令分配给多个核蒸汽供应统。提出了热功率的上、下两层动态矩阵控制(DMC)方法。上层以跟踪核岛热功率为目标,为每个核蒸汽供应系统分配热功率指令;下层通过调节核功率,跟踪上层的热功率指令。采用截断奇异值分解(TSVD)方法,减少了海森(Hessian)矩阵的条件数,提高了系统的鲁棒性。利用该方法,实现了六模块高温气冷堆核电站的热功率优化。数值仿真结果验证了控制设计的有效性。多模块高温气冷堆热功率控制方法对于降低操作员工作强度、提高负荷跟踪能力具有重要价值。
Multi-module high temperature gas-cooled reactor(MHTGR) nuclear power plant is an advanced nuclear power plant features inherent safety and multipurpose.To realize grid-connected power generation,grid frequency control and absorb of renewable energy,MHTGR nuclear power plant uses multiple nuclear steam supply system(NSSS) to drive conventional island load devices.However,as the number of NSSS modules increases,it becomes difficult to allocate the total thermal load to each module manually,especially when nuclear power plant operates in load following mode.The upper/lower hierarchical dynamic matrix control(DMC) method is proposed.The upper layer aims to track the nuclear island thermal power and assigns thermal power commands to each nuclear steam supply system.The lower layer tracks the upper layer's thermal power command by adjusting the nuclear power. The truncated singular value decomposition(TSVD) method is utilized to reduce the condition number of the Hessian matrix and enhance the robustness of system.The proposed method is applied to the thermal power control of six-module high temperature gas-cooled reactor nuclear power plant and the effectiveness is verified by numerical simulation results.The thermal power control method proposed is of great value to reduce the working burden of operators and improve the load tracking ability.
Multi-module high temperature gas-cooled reactor(MHTGR) nuclear power plant is an advanced nuclear power plant features inherent safety and multipurpose.To realize grid-connected power generation,grid frequency control and absorb of renewable energy,MHTGR nuclear power plant uses multiple nuclear steam supply system(NSSS) to drive conventional island load devices.However,as the number of NSSS modules increases,it becomes difficult to allocate the total thermal load to each module manually,especially when nuclear power plant operates in load following mode.The upper/lower hierarchical dynamic matrix control(DMC) method is proposed.The upper layer aims to track the nuclear island thermal power and assigns thermal power commands to each nuclear steam supply system.The lower layer tracks the upper layer's thermal power command by adjusting the nuclear power. The truncated singular value decomposition(TSVD) method is utilized to reduce the condition number of the Hessian matrix and enhance the robustness of system.The proposed method is applied to the thermal power control of six-module high temperature gas-cooled reactor nuclear power plant and the effectiveness is verified by numerical simulation results.The thermal power control method proposed is of great value to reduce the working burden of operators and improve the load tracking ability.
引文
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[2] ZHANG Z Y,DONG Y J,LI F,et al.The Shandong Shidao Bay 200 MWe high temperature gas- cooled reactor pebble- bed module (HTR- PM) demonstration power plant:An engineering and technological innovation[J].Engineering,2016(2):112- 118.
[3] DONG Z,PANG Y F,ZHANG Z Y,et al.Dynamical modeling and simulation of the six- modular high temperature gas- cooled reactor plant HTR- PM600[J].Energy,2018,155:971- 991.
[4] KIM K K,BERNARD J A.Considerations in the control of PWR- type multi- modular reactor plants[J].IEEE Transactions on Nuclear Science,1995,41(6):2686- 2697.
[5] ZHANG B W,PENG M J,CHENG S Y,et al.Novel fuzzy logic based coordinated control for multi- unit small modular reactor[J].Annals of Nuclear Energy,2019,124:211- 222.
[6] 席裕庚,李德伟,林姝.模型预测控制——现状与挑战[J].自动化学报,2013,39(3):221- 236.
[7] DONG Z,PAN Y F,ZHANG Z Y,et al.Model- free adaptive control law for nuclear superheated- steam supply systems[J].Energy,2017,135:53- 67.
[8] DONG Z,SONG M X,HUANG X J,et al.Coordination control of SMR- based NSSS modules integrated by feedwater distribution[J].IEEE Transactions on Nuclear Science,2016,63(5):2682- 2690.
[9] DONG Z,ZHANG Z Y,DONG Y J,et al.Multi- layer perception based model predictive control for the thermal power of nuclear superheated- steam supply systems[J].Energy,2018,151:116- 125.
[10]JIANG D,DONG Z,LIU M,et al.Dynamic matrix control for the thermal power of MHTGR- based nuclear steam supply system[J].Energy,2018(11):2651.