Fault monitoring method and system for power supply unit of AC power grid

Abstract

The invention provides a frequency and magnetic field value based fault monitoring method for a power supply unit of an AC power grid. The invention also relates to a system for the method. The systemis composed of at least one power system frequency monitoring device, magnetic field monitors and central processing equipment communicated with one another via the network. According to the method,a frequency index of the power system serves as a first level criterion to determine whether the power supply unit of the AC power grid has a fault, and a magnetic field generated by a power plant andDC converter station access system serves as a second level criterion to determine which power supply unit has the fault. Compared with present system and method, the system and method of the invention can satisfy requirement for operation state information of a power generating unit of a power market participant, reduce the hardware and communication cost and reduce the computational complexity.

Description

technical field [0001] The invention relates to a fault monitoring method for power supply units such as a power plant and a high-voltage direct current converter station, in particular to a fault monitoring method for an AC grid power supply unit based on frequency and magnetic field. The invention also relates to a fault monitoring system for an AC grid power supply unit. Background technique [0002] At present, countries such as North America, Europe, the United Kingdom, and Australia have established electricity markets. Market participants such as power plants, power users, electricity sales companies, and market makers can trade electricity through various channels such as bilateral price difference contracts, futures, day-ahead or real-time markets. my country launched a new round of power market reforms in 2015, and plans to launch pilot power spot markets in Guangdong, Shandong and other places before the end of 2018. The state of electricity supply is a key fact...

AI Technical Summary

Problems solved by technology

The disadvantages lie in the following three aspects. First, the cost of the thermal imager is high. A thermal imager with a detection distance of more than 1 km generally costs about 15,000 RMB. Second, the communication cost is high, and real-time transmission of image data requires high communication costs. ; The third is that it is only suitable for thermal power units with chimneys, and is not suitable for large-capacity power sources such as nuclear power and high-voltage direct current (HVDC)

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