Combined Optimal Dispatch Of Power System With Nuclear Power Participating In Peak Load Regulation

With the increasing of nuclear power's proportion of the power structure and the growing of difference between peak and valley, the situation of power system peak-load shaving is getting serious. In the water-starved area, if the million capacities nuclear power connectes to the power system, peak-load shaving of power system will become more difficult, in the load peak or valley, especially in load valley of the winter heating period. In the actual operation, if nuclear power participates in peak load regulation, it will been limited by the safe operation of nuclear power, it cannot track the load variation directly in the peak depth by controlling the nuclear reaction rate. If nuclear power runs stablely in the base load, it will be difficult to meet the load demand, only by thermal power plants and pumped storage plants participating in peak load regulation. Therefore, the limited output of clean energy becomes inevitable, it is of great significance to do the combined optimal dispatch with nuclear power participating in peak load regulation.Through the heat storage device's time transfer of energy, a model for combined optimal dispatch of nuclear-thermal-storage was proposed, to realize the nuclear power participating in equivalent peak load regulation. By means of the traditional economic dispatch model, the actual depth of power regulation was determined. After that, combined optimal dispatch of nuclear-thermal-storage was carried out, through the thermal storage device's heat and release, the amount of the nuclear power participating in peak load regulation was consumed, the output of other units was optimized, and the peak load regulation was come true with the nuclear power output was nominal.In view of the increasing of stochastic wind power installed capacity, the probability model of wind power was set up by following Beta distribution, the combined optimal dispatch of nuclear-thermal-wind-storage was builed, with nuclear power participating in peak load regulation by considering the uncertainty. The actual output of wind power was viewed as a random variable, probabilistic constraints were introduced to define the possibility of realizing the scheduled output of wind power, the difference between conditional expectations of the wind power's actual output in the next dispatch day and scheduled output of wind power was used to amend the positive and negative spinning reserve. Moerover, the stochastic programming was used to complete the scheduling plan, and realize the nuclear power participating in equivalent peak load regulation. Due to the versa load characteristics of wind power, the difference between peak and valley increased further, the difficulty of nuclear power participating in equivalent peak load regulation raised, nuclear power for base load peak task would been achieved by increasing the capacities of heat storage devices.This paper simulated the actual system of Northern province power network dispatch, and studied the combined optimal dispatch of nuclear-thermal-wind-storage with nuclear power participating in peak load regulation by considering the uncertainty. It compared the results, analyzed the feasibility of the model and its implications for the economy of Northern province power system.