Accident quick gate falling speed regulation device for wind hoist and control method

Abstract

The invention discloses an accident quick gate falling speed regulation device for a wind hoist and a control method. The accident quick gate falling speed regulation device comprises a brake, a height gauge, a speed sensor and a controller. The balancing magnitude relation of damping torque and holding force of the brake is controlled by acquiring the comparison value of the gate falling speed and the predetermined speed, and the purpose that a gate falls down at the predetermined speed is achieved; by acquiring the gate falling speed and the position signal, control is conducted according toa sequence closing method, quick falling of the gate and timely water flowing speed reduction are achieved, a hydraulic turbine set is prevented from operating in a runaway manner, the gate slowly falls into a bottom sill, the impact is reduced, and the gate and the bottom sill are protected from being damaged due to impact. According to the accident quick gate falling speed regulation device forthe wind hoist and the control method, the full-closed-loop automatic redundancy design is adopted, it is guaranteed that the gate is quickly, stably and safely closed in time under the accident state.

Description

technical field [0001] The invention relates to the technical field of fast gate control for water conservancy and hydropower accidents, in particular to a speed regulating device and a control method for fast gate falling in hoist hoist accidents. Background technique [0002] my country is rich in water conservancy resources, and the development of water conservancy and hydropower is rapid. The water intakes of small and medium-sized hydropower stations are generally designed with emergency fast gates controlled by winch-type fast gate hoists. A runaway accident occurred in the hydroelectric generating unit, which effectively avoided the occurrence of accident expansion. In 2009, Russia's Sayano-Shushensk Hydropower Station suffered a major accident expansion event because the accident fast gate failed to close in time and correctly. The emergency fast gate is the lifeline of the hydroelectric generating set. [0003] At present, the emergency fast gates of the water in...

AI Technical Summary

Problems solved by technology

Therefore, the balance speed of the centrifugal flying pendulum governor increases, and the falling speed of the door will increase with the decline of the gate. The speed at the beginning of the door drop is low, which makes the interception speed slow, and the emergency shutdown time of the turbine unit increases, which may cause a runaway accident of damage to the unit. Then, the speed of the door at the next stage is faster, and the water flow time is short, which affects the flow of the turbine chamber. Unfavorable state produces anti-water hammer effect and damages the turbine due to lifting phenomenon

[0007] 3. It is very inconvenient to determine the quality of the flying ball and the pressure of the starting spring when the centrifugal flying pendulum governor is working. It needs to be readjusted when the water level and other conditions change. For example, after the gate drops to a certain height, the water flow in the flow channel From full flow to under flow, the water flow has a great suction on the gate, causing the gate to drop faster and seriously affecting safe operation, which is difficult to meet in practical equipment management.

In recent years, it has been reported that the hydraulic governor and the mechanical governor used are basically the same, which cannot effectively solve the timely, accurate and safe problems of rapid door falling, let alone improve the hydraulic power required by the hydroelectric generator set under the accident state. working conditions

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