Frequency measurement method, device and system for pumped storage unit

A technology for pumped storage units and frequency measurement, which is applied to measuring devices, devices using electric/magnetic methods, linear/angular velocity measurement, etc., can solve problems such as different frequency requirements, ensure reliability and improve frequency measurement Reliability, effect of preventing false signals

Active Publication Date: 2014-08-27
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0015] The purpose of the present invention is to propose a new frequency measurement method, device and system for pumped storage units to ove

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  • Frequency measurement method, device and system for pumped storage unit
  • Frequency measurement method, device and system for pumped storage unit
  • Frequency measurement method, device and system for pumped storage unit

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[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0028] figure 1 It is a flowchart of a frequency measurement method of a pumped storage unit according to an embodiment of the present invention. Such as figure 1 As shown, the frequency measurement method of this embodiment includes: step S1, acquiring control instructions of the pumped storage unit in different working modes, the working modes including turbine-direction power generation mode and water pump-direction pumping mode; step ...

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Abstract

The invention provides a frequency measurement method, device and system for a pumped storage unit. The method comprises the steps of obtaining control instructions of the pumped storage unit in different working modes, wherein the working modes include the water turbine direction electricity generation module and the water pump direction water pumping mode; according to the control instructions and set selection logic, selecting PT frequency measurement or toothed disc frequency measurement at different stages in each working mode. According to the frequency measurement method, device and system for the pumped storage unit, the specific frequency measurement schemes and frequency measurement measures are adopted for a special working condition to avoid error signals, the exclusive frequency measurement schemes are developed particularly for the two special working conditions of SFC dragging and electric braking halt, and safe and reliable running of the unit is ensured; meanwhile, three probes are selected in the toothed disc frequency measurement scheme for frequency measurement, the real rotating speed of the unit can be given according to the health status and switching logic of the three probes, the confidence level of the toothed disc frequency measurement is ensured, and the frequency measurement reliability of the whole unit is improved.

Description

technical field [0001] The invention relates to the field of frequency measurement of a pumped storage unit, in particular to a frequency measurement method, device and system for a pumped storage unit. Background technique [0002] As the most important work of the speed control system, frequency measurement directly affects the safe and stable operation of the pumped storage unit, and also involves the control of auxiliary equipment. Therefore, frequency measurement has always been the core of the speed control system design. Currently, PT frequency measurement and sprocket frequency measurement are the most frequently used frequency measurement methods in conventional power stations. Among them, PT frequency measurement is to use the residual voltage signal of the voltage transformer at the machine terminal to be used for frequency measurement of the governor after being amplified. The toothed disc is a ring-shaped toothed device installed on the large shaft of the hydro...

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Application Information

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IPC IPC(8): G01P3/44G01P3/00
Inventor 周喜军周攀高翔秦俊马进潮邓磊吕滔周东岳
Owner STATE GRID CORP OF CHINA
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