Dry-type reactor monitoring method based on waveform reduction technology and implementation device thereof

A technology of dry-type reactors and waveforms, applied in circuit devices, information technology support systems, electrical components, etc., can solve problems such as rising hardware costs, difficulties in engineering applications, and decreased data accuracy, achieving improved accuracy, stable algorithm convergence, and The effect of avoiding calculation errors

Inactive Publication Date: 2019-07-05
ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The urgent problem is that the high sampling frequency and complex mathematical operations lead to a sharp increase in hardware costs and a decrease in data accuracy, making it difficult and bottleneck in the engineering application of online monitoring

Method used

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  • Dry-type reactor monitoring method based on waveform reduction technology and implementation device thereof
  • Dry-type reactor monitoring method based on waveform reduction technology and implementation device thereof
  • Dry-type reactor monitoring method based on waveform reduction technology and implementation device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] This embodiment is used for monitoring the turn-to-turn short circuit process of a dry-type air-core reactor. The reactor has a rated voltage of 20.207kV, a rated capacity of 20000kvar, a rated current of 989.74A, a rated inductance of 64.99mH, and an operating frequency of 50Hz. In the upper and lower envelopes outside the reactor, inter-turn drawing is performed in advance, and the actual inter-turn short circuit fault is simulated through the instantaneous short circuit between the drawing lines. The sampling module adopts 485 bus to connect to the main control room, the sampling frequency is 2000Sa / s, the total voltage and current signals of the reactor are collected in groups of 2, the sampling precision is 16 bits, and the fitting factor is selected as 1 / 3. The voltage frequency V|Freq. and phase difference ΔPhase monitoring graph of the monitoring module during the artificial turn-to-turn short-circuit fault period are as follows: Figure 5 shown. When the inter...

Embodiment 2

[0063] It is used for inter-turn short-circuit process monitoring of dry-type air-core reactors. The rated voltage of the reactor is 831.4V, the rated capacity is 168.0kvar, the rated current is 202.07A, the rated inductance is 13.10mH, and the working frequency is 50Hz. In the upper and lower envelopes outside the reactor, inter-turn drawing is performed in advance, and the actual inter-turn short circuit fault is simulated through the instantaneous short circuit between the drawing lines. The sampling module adopts ZigBee wireless transmission, and is connected to the main control room through the receiver. The sampling frequency is 4000Sa / s, and the reactor voltage and current are collected in groups of 2 channels. The sampling accuracy is 16 bits, and the fitting factor is selected as 1 / 20. The frequency I|Freq. of the current signal of the monitoring module during the artificial short circuit and the monitoring graph of the power factor PF are as follows: Image 6 shown. ...

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Abstract

The invention relates to a dry-type reactor monitoring method based on waveform reduction technology and an implementation device thereof. In the method, voltage and current signals are collected in pairs through a DSP (digital signal processor) or a single chip microcomputer, and the waveform restoration calculation of the corresponding signals is performed by adopting an improved spline fittingmodel; determining the zero crossing point of the obtained waveform, and if a zero crossing point criterion is triggered, calculating the corresponding signal frequency of the waveform by using the time interval of two zero crossing points of the same signal waveform according to the sampling frequency or the clock sequence of the DSP or the single chip microcomputer as a reference; calculating phase difference according to the time difference of successive zero crossing points in the same signal group; further calculating a power factor; and transmitting the real-time phase difference, frequency and power factor calculation results to a remote computer through a protocol, storing and processing the real-time data by the computer, performing statistic analysis of the change and the abnormal fluctuations of the frequency, the phase difference and the power factor to monitor the states of operation of an electric power system and an electric power device for timely early warning and alarm.

Description

technical field [0001] The invention belongs to the technical field of power grid monitoring, and relates to the monitoring technology of dry-type reactor state parameters, in particular to a dry-type reactor monitoring method and device based on waveform restoration technology, which are used for monitoring and evaluating the operating state of the power grid and for reactors and other non-conductive devices. Fault warning, alarm and other fields of power compensation equipment. Background technique [0002] With the popularization and application of high-voltage and large-capacity power grids and power harmonic pollution caused by nonlinear loads, online monitoring means and methods to characterize the safe operation status of dry-type reactors have become the key technologies of current smart grids. In order to ensure the healthy and reliable operation of the grid, suppress high-order harmonics, and improve active power transmission, it is necessary to digitize the voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00
CPCH02J13/0006Y04S20/242Y02B70/30
Inventor 杨海涛丁国成吴兴旺刘全峰郑莉军梁艺超赵倩谢佳田宇柯艳国罗纱尹睿涵张晨晨张竹刘虎成马骁兵刘啸野浦劲松胡细兵张仁标程坤徐云郑雨果
Owner ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER
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