System and method for monitoring operation state of magnetic valve type controllable reactor and excitation unit of magnetic valve type controllable reactor

Abstract

The invention discloses a system and method for monitoring an operation state of a magnetic valve type controllable reactor and an excitation unit of the magnetic valve type controllable reactor. According to the monitoring system, the excitation unit current information measured by an AC/DC active CT transformer is transmitted to an AC/DC mixed signal processor, and the excitation unit current information processed by the AC/DC hybrid signal processor is wirelessly transmitted to a second Zigbee wireless transmission processor through a first Zigbee wireless transmission processor; the magnetic valve temperature information corresponding to a temperature measurement point is decoded by an optical fiber temperature measurement decoding module and then transmitted to an optical fiber temperature measurement signal demodulation processor; the excitation unit current information processed by the second Zigbee wireless transmission processor and the magnetic valve temperature information processed by the optical fiber temperature measurement signal demodulation processor are transmitted to a protocol conversion communication unit, and the signal is then transmitted by the protocol conversion communication unit to an integrated MCR operation state monitoring system. The system is advantaged in that problems of internal high voltage of a core of a magnetron reactor, strong magnetic field interference and reliability of signal transmission of a high voltage excitation unit are solved.

Description

technical field [0001] The invention belongs to the field of power system power transmission and transformation equipment, and relates to the monitoring and analysis of the operation performance and health status of power system power transmission and transformation equipment, specifically a magnetic valve type controllable reactor and its excitation unit operation state monitoring system and method. Background technique [0002] With the advancement of technology, more and more dynamic reactive power compensation devices based on magnetic control reactors are applied to the power grid, providing more flexible and effective voltage and reactive power adjustment capabilities for the power grid. However, in the actual application of such new flexible power transmission equipment that combines traditional grid equipment and power electronic control technology, special fault detection and online monitoring devices and other fault prevention methods have not been maturely develop...

AI Technical Summary

Problems solved by technology

However, considering the importance of the trigger signal to the reliable and stable operation of the system, the online acquisition of the thyristor gate trigger signal may reduce the operational reliability of the system, which is not conducive to the safe and stable operation of the system.

[0004] In order to realize the temperature measurement of the magnetic valve, as far as the existing temperature measurement technology is concerned, whether it is commonly used RTD thermal resistance (Pt100), thermocouple (high resistance wire) and other electrical temperature measurement sensors, or pressure thermometers, infrared temperature measurement and other temperature measurement technologies, first of all, they are unable to completely solve the safety hazards caused by the insulation of high-voltage equipment caused by metal wires, metal parts, shielding measures, installation of pressure temperature bulbs or infrared probes in high-voltage areas, and metal wires and metal parts. There will also be serious eddy current loss and heating problems in the environment; in addition, the weak current temperature signal will be seriously disturbed in the strong magnetic field environment, making it difficult to provide real-time, stable and reliable temperature information

The fiber grating temperature sensor, which is commonly used in temperature measurement applications of transformers and dry-type air-core reactors, has the characteristics of passive, strong anti-electromagnetic interference, and can be used in harsh environments, but is limited by its own technical principles. It is often necessary to solve the comprehensive interaction of environmental factors such as pressure, stress, temperature, vibration, and bending, and often requires more complex packaging technology, which is not conducive to the measurement of a single temperature physical quantity in a complex space environment.

As mentioned above, MCR changes the saturation of the magnetic valve by adjusting the magnitude of the DC excitation current, and then realizes the continuous adjustment of the reactive capacity; and the "excitation current detection circuit for magnetically controlled reactor" disclosed in Chinese patent 201420738387.6 In this method, the DC excitation current and magnetic valve saturation information are obtained by pre-embedding the DC shunt resistor inside the magnetron reactor; however, under the internal environment characteristics of high voltage, strong magnetic field interference and strong corrosion, The received electrical signal may be seriously interfered, and then problems such as data drift, high failure rate and data misreporting may occur, and the reliability and stability of the measurement information cannot be guaranteed

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