Method and system for correcting water flow inertia time constant in water turbine and diversion system model

A water diversion system and water flow inertia technology, applied in data processing applications, special data processing applications, instruments, etc., can solve problems such as the deviation between the actual value of the water flow inertia time constant and the design value, and achieve simple test methods, accurate test values, and improved The effect of efficiency and precision

Pending Publication Date: 2022-01-28
云南电力试验研究院(集团)有限公司
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Problems solved by technology

[0004] The present invention derives and provides a correction method for the time constant of water flow inertia. By introducing the correction coefficient of the time constant of water flow inertia, the problem of deviation between the actual value of the time constant of water flow inertia and the design value is solved, and the stability calculation of the power system is improved in all working conditions. Simulation Efficiency and Accuracy

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  • Method and system for correcting water flow inertia time constant in water turbine and diversion system model
  • Method and system for correcting water flow inertia time constant in water turbine and diversion system model
  • Method and system for correcting water flow inertia time constant in water turbine and diversion system model

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example

[0082] A giant hydropower station, the hydraulic turbine type is vertical shaft mixed flow, the water diversion system adopts single-pipe stand-alone mode, rated power is 600MW, rated water head is 111m, and rated flow rate is 597.95m 3 / s, the design value of water flow inertia time constant is 2s.

[0083] Under three operating water heads of 108m, 113.8m, and 117m respectively, the unit has active power of 240MW, 480MW, and 600MW, and a given step of the guide vane is applied to the governor, and the actual active power reverse curve is measured; the statistics of the unit under the three water heads When the rated load is 600MW, the flow rate is 601.32m 3 / s, 561.72m 3 / s, 548.49m 3 / s, substitute the head and flow data into figure 2 The model shown (f(H i )=Q i (i=1, 2, 3...)), then the three-stage correction model of the water flow inertial time constant coefficient can be obtained.

[0084] The water flow inertia time constant correction coefficient is:

[0085]...

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Abstract

The invention discloses a method and system for correcting a water flow inertia time constant in a water turbine and diversion system model, and the method comprises the steps: selecting three operation water heads for the same grid-connected operation unit, selecting three same working condition points under each operation water head, carrying out the given step disturbance of a guide vane, recording output curves of the running water head, the active power and the unit flow, and analyzing an active power reverse regulation rule; introducing an active power initial value and a water flow inertia time constant correction coefficient which have a linear relationship with active power reverse adjustment to obtain an improved water turbine and water diversion system model; and verifying the effectiveness and accuracy of the improved water turbine and diversion system model and the water flow inertia time constant coefficient. According to the system and method, active power reverse adjustment changes under different operation water heads and multiple working condition points can be achieved, the test method is simple, the test value is accurate, and the efficiency and precision of all-working-condition simulation of stable calculation of a power system are improved.

Description

technical field [0001] The invention belongs to the field of regulation of hydropower units in power grids, and in particular relates to a water flow inertia time constant correction system and method for a water turbine and a water diversion system model. Background technique [0002] After the asynchronous network operation of the Yunnan power grid, the large-scale hydropower unit governor is in the adjustment process. Due to the rapid opening or closing of the unit guide vane, the unit flow rate changes suddenly, causing the water hammer effect, and then causing the reverse adjustment of the active power. This phenomenon presents a phase lag to the system and provides negative damping, which can easily induce the ultra-low frequency oscillation phenomenon of the system and seriously deteriorate the stable operation of the system. In the power stability calculation, the main parameters representing the water hammer effect are the water flow inertia in the water turbine and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F30/17G06Q50/06
CPCG06F30/28G06F30/17G06Q50/06
Inventor 王浩何常胜胡亚州杨剑锋徐叶松丁永胜
Owner 云南电力试验研究院(集团)有限公司
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