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A Control Method for Preventing Power Adjustment Oscillation of Hydroelectric Units

A technology for unit power and power regulation, applied in the direction of reducing/preventing power oscillation, hydropower generation, adaptive control, etc., can solve problems such as weakening the damping torque of the unit, improve the level of safety and stability, increase damping, and prevent power control oscillating effect

Active Publication Date: 2017-07-28
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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Problems solved by technology

[0003] The excitation system may weaken the damping torque of the unit, and even cause the damping torque to be negative. Therefore, the negative damping mechanism is widely used in low-frequency oscillation analysis and research on suppression methods. With the input of a power system stabilizer (PSS) on the excitation side, It has a very good suppression effect on the oscillation caused by the low damping of the power grid, but the power low-frequency oscillation caused by the complex control object and control system of the generator set is still happening continuously

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  • A Control Method for Preventing Power Adjustment Oscillation of Hydroelectric Units

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Embodiment Construction

[0029] A control method for preventing power adjustment oscillation of a hydroelectric unit, implemented on the platform of the main control system of the hydroelectric unit, and the implementation method includes the following steps:

[0030] 1. Control function configuration for the main control system:

[0031] (1) By adding a parameter adaptive control link in the power control circuit of the hydroelectric unit, the head of the unit and the opening of the guide vane have a great influence on the power of the unit, to achieve the adjustment quality that does not affect the power control when the main operating parameters of the unit change greatly;

[0032] R=1×f1(h)×f2(V) (1)

[0033] h—water head;

[0034] f1(h)—the function of the water head of the unit to the power;

[0035] f2(V)—the function of the unit guide vane opening to the power;

[0036] The unit power control adopts the single-loop PID adjustment method, and the calculated unit power adaptive factor is used...

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Abstract

The invention discloses a control method for preventing power regulation oscillation of hydroelectric generating set. The method comprises the following steps of (1) by the provided parameter adaptive control links having relatively great influence on set power, such as additionally arranging a set water head in a hydroelectric generating set power control loop, realizing the purpose that regulation quality of power control cannot be influenced when an operation principal parameter of the set varies greatly; (2) by the provided means of additionally arranging a filtering link in the controlled parameter measuring link of hydroelectric generating set power regulation, increasing damp of a set closed-loop regulation loop and avoiding a resonance band with an electric grid, thus enabling set power control to be relatively steady; and (3) by means of increasing the linear correction of water turbine guide vane opening control, improving water turbine opening linearization level and enabling the power regulation of the set to be relatively steady. The method has the remarkable advantages of being capable of greatly reducing electric system low-frequency oscillation caused by power oscillation of the hydroelectric generating set, and improving safety and stability level of the set and the electric grid.

Description

technical field [0001] The invention belongs to the field of automatic control of hydroelectric power stations, and aims at the common risk of power control oscillation of current hydroelectric units. Through the application of this control method, the low-frequency oscillation of the power system caused by the power control oscillation of hydroelectric units can be greatly reduced, and the connection between the unit and the power grid can be improved. level of safe and stable operation. Background technique [0002] In recent years, the power low-frequency oscillation of domestic hydropower units has occurred from time to time, which has brought a great threat to the stable operation of the power grid. The stable operation of the unit is directly related to the safe and stable operation level of the power grid. The power oscillation of the unit will cause the oscillation of the power grid, which seriously threatens the safe and stable operation of the power grid. Although...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24F03B15/00G05B13/02
CPCY02E10/20
Inventor 刘友宽高东磊李晓娇张建辉李萍杜景琦李长更
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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