Guangxi Key Laboratory of Power System Optimization and Energy Technology (Guangxi University), Nanning 530004, China
This work is supported by National Natural Science Foundation of China (No. 51667003).
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 operating 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.