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Ultra-low frequency oscillation control method for hydropower unit in asynchronous networking network scenario

A technology of hydroelectric unit and control method, applied in the direction of reducing/preventing power oscillation, circuit device, AC network circuit, etc.

Inactive Publication Date: 2019-03-01
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overseas, in the 1960s and 1970s, Canada’s BC Hydro Bureau conducted some basic research, conducted experiments, modeling, and simulations on simple power grids, and summarized some experiences. However, similar problems have rarely been reported in the past 30 years, and they have been found in a small number of literatures Only Turkey Power Grid, Colombia Power Grid

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  • Ultra-low frequency oscillation control method for hydropower unit in asynchronous networking network scenario
  • Ultra-low frequency oscillation control method for hydropower unit in asynchronous networking network scenario
  • Ultra-low frequency oscillation control method for hydropower unit in asynchronous networking network scenario

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The suppression effect of the ultra-low frequency oscillation with a frequency of 0.021 Hz using the ultra-low-frequency oscillation control method in the asynchronous networking scenario of hydropower units described above.

[0080] Use ADPSS, a full-digital real-time simulation device for portable power systems, to apply an ultra-low frequency oscillation with an oscillation frequency of 0.021 Hz to the GPSS device, record the curves of GPSS output, control output of the original speed control system, and the stroke of the servomotor of the speed control system, and test the effect of GPSS on the vibration the response to.

[0081] An example of a disturbance with an oscillation frequency of 0.021Hz Figure 11 As shown, "frequency" is the frequency of the analog grid, which is the ADPSS modulation output signal, "PIDOUT" is the output signal of the main loop control PID link of the speed control system, "GPSSOUT" is the output signal of the GPSS additional control, "o...

Embodiment 2

[0083] The suppression effect of the ultra-low frequency oscillation with a frequency of 0.085 Hz by using the ultra-low frequency oscillation control method in the asynchronous networking scenario of hydropower units described above.

[0084] Using a portable ADPSS, apply ultra-low frequency oscillation with an oscillation frequency of 0.085Hz to the GPSS device, record the curves of GPSS output, control output of the original speed control system, and servomotor travel of the speed control system, and test the response of GPSS to the oscillation. Test curve such as Figure 12 shown.

[0085] Oscillation frequency is 0.085Hz disturbance test such as Figure 12 As shown, the frequency difference of the input frequency disturbance signal gradually increases from 0 to plus or minus 0.55Hz. When GPSS is not put into operation, under the grid frequency disturbance, the control output of the speed control system gradually increases, and there is a trend of increasing oscillation. Wh...

Embodiment 3

[0087] The suppression effect of the ultra-low frequency oscillation with a frequency of 0.17 Hz using the ultra-low frequency oscillation control method in the asynchronous networking scenario of hydropower units described above.

[0088] Using a portable ADPSS, apply ultra-low frequency oscillation with an oscillation frequency of 0.170 Hz to the GPSS device, record the curves of GPSS output, control output of the original speed control system, and servomotor stroke of the speed control system, and test the response of GPSS to the oscillation. Test curve Figure 13 shown.

[0089] Oscillation frequency is 0.17Hz disturbance test such as Figure 13 As shown, the frequency difference of the input frequency disturbance signal gradually increases from 0 to plus or minus 0.55Hz. When GPSS is not put into operation, under the grid frequency disturbance, the control output of the speed control system gradually increases, and there is a trend of increasing oscillation. When GPSS A...

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Abstract

An ultra-low frequency oscillation control method for a hydropower unit in the asynchronous networking scenario is provided. The method comprises: 1) analyzing an ultra-low frequency oscillation phenomenon of a hydropower unit in the asynchronous networking scenario; 2) constructing a basic model of a turbine speed regulating system, and attaching a GPSS (General-Purpose System Simulator) device to the speed regulating system; 3) calculating the phase of the GPSS and the phase of the compensated speed regulating system; 4) performing time domain simulation check; and 5) outputting a time domain simulation check result. According to the method provided by the present invention, the problem that the ultra-low frequency oscillation phenomenon occurs after asynchronous networking of hydropowerunits of the power grid in Yunnan is overcome, a method for suppressing the ultra-low frequency oscillation phenomenon by using the GPSS based on the control technology principle of the GPSS is proposed, time domain simulation is performed on the proposed method, and the simulation result proves the validity and accuracy of the proposed method.

Description

technical field [0001] The invention relates to a hydroelectric unit, in particular to an ultra-low frequency oscillation control method in the asynchronous networking scenario of the hydroelectric unit, so as to solve the ultra-low frequency oscillation problem in the asynchronous networking scenario of the hydroelectric unit in a power grid. Background technique [0002] In the past two decades, the construction of hydropower stations in China has shown unprecedented prosperity, and the cumulative hydropower development has exceeded 300 million kilowatts. At the same time, many Chinese cities that rely on coal-fired power generation suffer from air pollution and urgently need to develop alternative energy sources such as solar, wind, nuclear and hydropower. China has the most abundant hydropower resources in the world, and the total amount of hydropower resources that can be developed reaches 540 million kilowatts. Therefore, it has become an important part of China's deca...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 李鹏徐光虎张建新邱建王波马恒瑞
Owner CHINA SOUTHERN POWER GRID COMPANY