Modeling And Simulation Of Nuclear Power Generating Unit And Speed Governor Svstem

With the development of society, the electricity demand is growing and the energy requirements are increasingly rigor. In the past for a long time, coal and oil are the two energy of human development. But coal and oil are non-renewable energy sources. According to some data, coal will be exhausted in200years and oil will be exhausted in100years with the current producing rate. And the burning of coal and oil will do harm to the environment. Therefore it is necessary to find a new energy to replace coal and oil. Wind and solar are the two clean energy. Because of its instability and immature technology, it is impossible to replace coal and oil. Nuclear power is a safe, clean and economic energy, which can be the only large-scale alternative energy of coal and oil. Currently main use of nuclear power is generating electricity. The initial investment of nuclear power plant is larger than thermal power plant, but when completed, the cost of per unit electricity is lower. The next few decades, China will actively develop nuclear power. According to our country’s medium-and long-term nuclear power development plan (2005-2020), by2020China’s nuclear power installed capacity will reach40million kW and the annual generating capacity of nuclear power will reach260-280billion kWh.As the proportion of nuclear power in the grid grows, the problem of power system peaking is more and more prominent. Since the initial investment of nuclear power plant is very large, under the support of national policy, currently nuclear power plants operate with base load. When the proportion of nuclear power is low, nuclear power plants can run with base load. But when the proportion of nuclear power increases, it will have a great impact on other generating units if nuclear power plants are not involved in power system peaking. Some thermal generating units will have to shut down at night and start in the next day, which only need to reduce the load originally. So in order to insure the power system operate safely, stably and economically, the nuclear power plants will gradually participate in power system peaking. Since the nuclear power plants are generally operating with base load and run at full capacity, lacking of the experience of peaking, it is necessary to find out whether nuclear power plants have the ability to participate in power system peaking like thermal power and hydropower plants, what power regulation means nuclear power plants have, what peaking experience foreign countries have.The capacity of nuclear power generating units are generally larger than thermal power and hydropower generating units. Its operating characteristics are also very different. In current power system simulation, the nuclear power plant is treated as a constant power source. Once the nuclear power plants participate in power system peaking, it will have an impact on the operation of power system. And the safety requirements of nuclear power plants are higher than thermal power and hydropower plants, so it is necessary to establish the mathematical model of nuclear power plant which can be used to study the interaction between nuclear power plant and power system. This paper will focus on researching the peaking experience of nuclear power plant at home and abroad, comparing nuclear power plant with thermal power plant, and establishing the detailed lumped parameter mathematical model of nuclear power plant in Matlab-Simulink. Based on the established mathematical model, the inherent characteristics and load-following capability of nuclear power plant, as well as the interaction between nuclear power plant and power system are researched. The main contents of the paper will contain:(1) Whether nuclear power plants have the necessity to participate in power system peaking;(2) The load-following capacity of nuclear power plant, including:power adjustable range, load-following speed, the impact on nuclear power plant’s economic and safe operation;(3) Peaking means of nuclear power plant, as well as the evolution of the load-following technology;(4) The peaking experience of nuclear power plant at home and abroad;(5) The establishment of nuclear power plant lumped parameter mathematical model and the simulation of its inherent characteristics;(6) The simulation of interaction between nuclear power plant and power system.