Method and system for fault monitoring of AC grid power supply unit
An AC power grid and power supply technology, which is applied in the direction of fault location and fault detection according to conductor type, etc., can solve the problems of high cost of thermal imager, high communication cost, high communication cost of real-time transmission of image data, etc., to reduce the amount of calculation, Reduce traffic, reduce the effect of hardware
Active Publication Date: 2019-02-01
广州能控电气技术有限公司
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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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[0059] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0060] figure 1 It is a block diagram of an embodiment of the power supply unit fault monitoring system proposed by the present invention.
[0061] The power supply unit failure monitoring system of this embodiment includes:
[0062] Several magnetic field monitors 101, 102, 103 and 104 with network communication interfaces are used to measure the magnetic field value generated by the power flow of overhead transmission lines.
[0063] A power system frequency monitoring device 106 with a network communication interface is connected to the voltage distribution system for measuring and recording power system frequency data;
[0064] The central processing device 105 is used to receive, store, and analyze frequency and magnetic field values, as well as store power system frequency characteristics, power plant, converter station capacity and c...
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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...
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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 李天强王克英
Owner 广州能控电气技术有限公司