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Method and device for inputting mechanical brake of pumped storage unit

A pumped-storage unit and mechanical braking technology, applied in mechanical equipment, safety devices, engine control, etc., can solve the problems of mechanical braking device damage, braking, mechanical braking device braking, etc., and achieve reliable and error-free input. , to ensure the effect of safety

Active Publication Date: 2021-08-03
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Some units have the problem of reverse rotation during the power failure of the water pump, which leads to the problem that the mechanical brake device has the problem of braking at the stage of high angular acceleration
At present, the mechanical brake device is activated when the unit speed is less than 5% after the guide vanes are fully closed; however, for units with reverse rotation, when the unit speed is less than 5%, the guide vanes are not fully closed. Failure of the lock signal will cause the unit to brake during the acceleration phase, causing serious damage to the mechanical brake device

Method used

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  • Method and device for inputting mechanical brake of pumped storage unit
  • Method and device for inputting mechanical brake of pumped storage unit
  • Method and device for inputting mechanical brake of pumped storage unit

Examples

Experimental program
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Effect test

Embodiment 1

[0065] see Image 6 , is a specific method for putting into the mechanical braking device of the pumped storage unit of the present invention. In this method, the tooth disc counter and the machine terminal voltage transformer are used to collect the pulse signal of high potential number and the electric frequency signal collected by the machine terminal voltage transformer, and the pulse signal and the electric frequency signal are converted into the rotational speed signal s, according to the rotational speed The signal s analyzes whether the rotational speed is less than 5% of the rated rotational speed, and when it is judged to be yes, the node at which the rotational speed is less than 5% is obtained, and it is judged whether the guide vane is fully closed. The feedback signal of the guide vane fully closed sensor is collected. When the feedback signal of the guide vane fully closed sensor is received, the guide vane full joint node is obtained, and the speed differential...

Embodiment 2

[0067] see Image 6 , is a specific method for putting into the mechanical braking device of the pumped storage unit of the present invention. In this method, the gear plate counter and the voltage transformer at the machine end are used to collect the pulse signal of the high potential number and the electric frequency signal collected by the voltage transformer at the machine end, and the pulse signal and the electric frequency signal are converted into the speed signal s, and the cut-off A low-pass filter with a frequency of 2Hz filters the speed signal and initializes the shift register. The initialized shift register stores three speed signals S 1 , S 2 and S 3 ;Collect a rotational speed signal value St at the current moment every 1 second, and update it as the rotational speed signal information of the register, that is, S 2 →S 1 , S 3 →S 2 , S t →S 3 ; Reuse the formula ds / dt=(S t -2·S t-1 +S t-2 ) / (2 T) to calculate the rotational speed differential value d...

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Abstract

The invention discloses a method for putting in a mechanical braking device of a pumped storage unit, comprising: obtaining the opening and closing state of a first relay, and the first relay is closed or disconnected according to a feedback signal from a guide vane fully closed sensor; collecting a rotational speed measuring device and convert the analog signal into a speed signal; obtain the opening and closing state of the second relay, and the second relay is closed or disconnected according to the relationship between the speed signal and the preset speed; obtain the opening and closing state of the third relay, and the second relay The three relays are closed or disconnected according to the relationship between the speed differential value of the pumped storage unit and the threshold value of the speed differential value; according to the opening and closing state of the first relay, the opening and closing state of the second relay and the opening and closing state of the third relay, judge Whether to put in the mechanical brake device. The method and device provided by the invention can prevent the unit from being mistakenly put into the mechanical braking device when the rotation speed of the unit is lower than the specified opening and the opening of the guide vane is non-zero, thereby reliably ensuring the safety of the unit.

Description

technical field [0001] The invention relates to the technical field of secondary equipment in electric power systems, in particular to a method and device for putting in mechanical brake of a pumped storage unit. Background technique [0002] The pumped storage unit has the characteristics of two-way high-speed rotation, large capacity, high water head, and frequent start-up. It undertakes important tasks such as peak regulation, frequency modulation, phase modulation, and emergency backup in the power grid. It is the most important energy storage means in the world. The consumption of intermittent, renewable energy is of great strategic importance. The mechanical brake device is an important auxiliary equipment for the pumped storage generator motor. It mainly acts as a brake on the unit during the shutdown of the unit, the conversion of working conditions (power generation to pumping, pumping to power, etc.) and the creeping process of the unit to reduce the inertia of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B15/00
CPCF03B15/00F05B2270/327Y02E10/20
Inventor 张飞王亮秦俊狄洪伟薛小兵李东阔王开成邓磊胡坤陈裕文蒋梦姣丁景焕
Owner STATE GRID CORP OF CHINA
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