Real-time monitoring and early warning method for subsynchronous oscillation

A sub-synchronous oscillation and real-time monitoring technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of long time consumption, long measurement and calculation time, poor real-time performance, etc., to overcome limitations, ensure real-time performance, The effect of guaranteeing accuracy

Active Publication Date: 2020-07-14
NORTH CHINA POWER ENG +1
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Problems solved by technology

The sub-synchronous oscillation analysis in the existing monitoring technology is offline, that is, WAMS or similar devices send out abnormal alarms, and the WAMS performs alarm confirmation and oscillation analysis, and then performs control operations. The whole process takes a long time and cannot quickly detect sub-synchronous oscillations. Synchronous Oscillation Frequency and Amplitude
At the same time, it is also possible to measure the frequency and amplitude of the subsynchronous oscillation signal by adding a spectrum analysis function to the PMU. However, the calculation of the subsynchronous oscillation signal by this method will affect the phase angle of the fundamental voltage and affect the power frequency phasor. Measurement accuracy, and the measurement and calculation time is long, and the real-time performance is poor

Method used

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  • Real-time monitoring and early warning method for subsynchronous oscillation
  • Real-time monitoring and early warning method for subsynchronous oscillation

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Embodiment Construction

[0035] A real-time monitoring and early warning method of subsynchronous oscillation in the present invention comprises the following steps:

[0036] Step 1: Multi-channel signal asynchronous sampling is performed on multiple points to be monitored in the power grid of the target area, and each channel of data includes current, voltage and speed sampling signals of the point to be monitored;

[0037] Step 2: Preprocessing each channel of data obtained in step 1, including: converting to a real physical quantity sampling value and / or unifying to the same sampling rate and / or aligning the time scale of each channel of data;

[0038] Step 3: Generate corresponding time-shifted data windows for each channel data, and perform high-speed parallel FFT calculations on all time-shifted data windows, more than 10 times per second;

[0039] Step 4: Perform interpolation correction on the FFT calculation result, and extract the amplitude and frequency of the frequency component in each ch...

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Abstract

The invention aims to provide a real-time monitoring and early warning method for subsynchronous oscillation in a regional power grid, which performs real-time measurement and parallel calculation ona plurality of measuring points in the regional power grid, performs centralized monitoring on subsynchronous oscillation on equipment in the power grid at the same time, and provides risk early warning according to the subsynchronous oscillation mode change trend and severity.

Description

technical field [0001] The invention relates to the field of electric power system automation, in particular to a real-time monitoring and early warning method and system for subsynchronous oscillation of a power grid. Background technique [0002] In recent years, with the needs of "West-to-East Power Transmission" and "North-to-South Power Transmission", a large number of large-capacity and long-distance transmission lines with series compensation have been put into operation. The series compensation capacitance on the line and the inductance of the line itself form a series electrical oscillation circuit , when the resonant frequency of the electrical circuit is coupled with the natural frequency of the generator shaft, it will cause subsynchronous resonance, which will endanger the safety of the generator shaft. [0003] With the rapid development of ultra-high voltage power grid and renewable energy power generation technology, a large number of new energy sources such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G06F17/14
CPCG01R31/08G01R31/088G06F17/141Y02E60/00
Inventor 徐珂王绍德黄晓峰王庆学朱芸康海燕任树东布林邹建红牛朋飞周军焰李盛程浩
Owner NORTH CHINA POWER ENG
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