Abstract:

There are many motors in operation or on standby in nuclear power plants, and the startup of group motors will have a great impact on the voltage of the emergency bus. At present, there is no special or inexpensive software to solve this problem, and the experience of engineers is not accurate enough. Therefore, this paper developed a method and system for the startup calculation of group motors in nuclear power plants and proposed an automatic generation method of circuit topology in nuclear power plants. Each component in the topology was given its unique number, and the component class could be constructed according to its type and upper and lower connections. The subordination and topology relationship of switches, buses, and motors could be quickly generated by the program according to the component class, and the simplified direct power flow algorithm was used to calculate the power flow for the startup of group motors according to the above relationship. Then, whether the bus voltage is in the safe range and whether the voltage exceeds the limit during the startup of the group motor could be judged. The practical example was used to verify the effectiveness of the method. Compared with other professional software, the method has high efficiency and low cost.

Key words: power supply for nuclear power plant, automatic topology recognition, startup of group motor, simplified direct power flow algorithm, verification method