Abstract
In view of the development trend of nuclear power and offshore wind power in China’s coastal areas, as well as the current situation of peak shaving pressure brought by reverse peak shaving of wind power to the power grid. In this paper, according to the number of failures and power loss per year in each region, the risk of peak load regulation is calculated comprehensively and quantitatively, and the risk cost increment of nuclear power peak shaving is calculated and evaluated. Optimize and linearize the constraints, and the relatively complete constraint conditions are established. Thus, the traditional peak shaving model of fixed gear nuclear power dispatch is improved, and the peak shaving depth is continuous within the safety regulation range of nuclear power. Then, based on the peak shaving operation model of nuclear power safety constraints, considering the nuclear power risk and wind power consumption, taking into account the operation cost, risk cost, environmental cost and safe operation constraints of various types of power supply, a multi-source optimal scheduling model of wind-nuclear-thermal-storage-gas is established. Based on the calculation example of the actual regional power grid, the security, low carbon and economy of the model are analyzed, and the sensitivity analysis of the risk cost coefficient and wind power reserve coefficient in the dispatching model is carried out. It can be concluded that the nuclear power has a little safety impact on the reactor core and coolant circulation system after participating in the peak shaving operation, and the increase in the probability of man-made misoperation is not obvious. The main source of the risk cost increase is the benefit loss of selling electricity, so that it can properly participate in the peak shaving of the system. When the nuclear safety risk is low and the risk of wind abandonment is high, the nuclear power peak shaving has a stronger economic advantage. The dynamic optimal allocation of wind power reserve capacity can further reduce the abandonment of nuclear power and improve the operation economy of the system.
Highlights
In China, with the increasing proportion of nuclear power installed, and the severe peak shaving situation of the system, the power grid requires it to have a certain peak shaving capacity
Due to the demand for cooling water sources, nuclear power units are generally built in coastal areas in China [1], [2]
If the optimization result requires nuclear power to participate in peak shaving, the corresponding nuclear power units will be involved in daily load tracking according to the operation states and safety times of all nuclear power units
Summary
In China, with the increasing proportion of nuclear power installed, and the severe peak shaving situation of the system, the power grid requires it to have a certain peak shaving capacity. Reference [11] conducted a detailed modeling analysis on the constraint conditions of ‘‘12-3-6-3’’ nuclear power output model, using multiple 0-1 variables to represent the nuclear power in different stages But it fixed the time of power up / down for 3 h On this basis, the author in [12] considered that the power up and down time of the third generation nuclear power unit can be 1 ∼ 3 h, further established the daily load tracking operation model of the fixed three gear peak shaving depth, and analyzed and calculated the peak shaving cost of the NPP. Based on the principle of economic dispatch, considering the operation cost of various types of units, incremental risk cost of peak shaving of nuclear power, wind power abandonment cost and system environment cost, an optimization model including multi-source coordinated dispatch is constructed.
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