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Water turbine speed-regulation parameter setting method capable of suppressing ultra-low frequency oscillation

A speed control system and water turbine technology, applied in circuit devices, AC network flicker reduction, AC network circuits, etc., can solve the problems of neglecting the adjustment quality of the speed governor, failing to show performance, and failing to guarantee the frequency response capability of the unit, etc. To achieve the effect of ensuring effectiveness and good adjustment performance

Active Publication Date: 2018-10-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, in the above-mentioned research on the tuning of governor parameters, they only aim at suppressing the ultra-low frequency oscillation existing in the system, ignoring the deterioration of the governor's adjustment quality during the optimization process.
That is, the governor parameters set for ultra-low frequency oscillation cannot guarantee the unit has a fast frequency response capability, and may not be able to show the expected performance under various disturbance situations

Method used

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  • Water turbine speed-regulation parameter setting method capable of suppressing ultra-low frequency oscillation
  • Water turbine speed-regulation parameter setting method capable of suppressing ultra-low frequency oscillation
  • Water turbine speed-regulation parameter setting method capable of suppressing ultra-low frequency oscillation

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Embodiment

[0040] In this example, figure 2 It is the wiring diagram of the four-machine two-area system. It includes two areas and four generators. The four generators are first boosted to 230KV in the station, and then the power is sent out. The transmission power between the areas is about 400MW through two circuits, in order to better reflect the power angle characteristics of the motor in the transient state. The generators all adopt the fifth-order model. G1, G2, and G4 in the system are equipped with governors. The transfer function of the speed control system is shown in formula (1) below;

[0041]

[0042] In the pattern recognition of the above system, the identification results show that there is a certain ultra-low frequency oscillation mode -0.0246+0.663j in the above system. Therefore, it is considered to optimize the relevant parameters of the speed control system of the system based on the control measures mentioned above.

[0043] figure 1 It is a flow chart of ...

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Abstract

The invention discloses a water turbine speed-regulation parameter setting method capable of suppressing ultra-low frequency oscillation, and the method comprises the steps: firstly setting a frequency domain performance index according to a complex torque coefficient method; secondly setting a time domain performance index according to the improved ITAE criterion; thirdly performing the weightedsumming of the frequency domain performance index and the time domain performance index based on the information entropy theory to form a comprehensive performance index; and finally taking the comprehensive performance index as a target function, performing optimization through the particle swarm optimization algorithm to obtain a speed regulator parameter with the optimal comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of power grid safety and stability control, and more specifically relates to a parameter setting method of a water turbine speed regulation system for suppressing ultra-low frequency oscillation. Background technique [0002] In the hydropower-rich regional power grid, a large number of governors have been put into use in order to meet the needs of rapid frequency adjustment, and the water hammer effect of the governor system makes the system prone to ultra-low frequency oscillations with a frequency lower than 0.2 Hz. In 2016, when China Southern Power Grid was conducting an asynchronous networking experiment in Yunnan, the system experienced an oscillation with an oscillation frequency of 0.05Hz and a fluctuation between 49.9 and 50.1Hz, and the oscillation lasted for 25 minutes. The research shows that after the independent operation of the Southwest Power Grid, in the mode of small load, more than 50% of...

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/382H02J3/00H02J3/002H02J2203/20
Inventor 易建波黄琦井实张国洲董彬彬
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA