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Frequency measurement device and method

A frequency measurement, square wave technology, applied in the field of power system, can solve problems such as lack of solutions, achieve the effect of convenient hardware implementation, high processing accuracy and speed, and improve efficiency

Active Publication Date: 2012-10-24
北京德威特电气科技股份有限公司
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Problems solved by technology

But how to improve the efficiency of frequency measurement, there is still a lack of effective solutions

Method used

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  • Frequency measurement device and method
  • Frequency measurement device and method

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specific Embodiment approach

[0027] Those skilled in the art can understand that the frequency measurement process in this embodiment can be performed continuously, and the specific implementation of the timer is not limited. For example, in an application example, the timer may include multiple registers, such as an initial value register, a count output register, and a count register. The central processing can access the initial value register and the count output register, but cannot access the count register. The initial value register records the initial value of the count. The counter performs loop counting. The count output register records the current count value of the counter. When the rising edge or falling edge of the square wave electrical signal arrives, the counting register performs counting, and the counting output register outputs an interrupt signal to the central processing unit, and the central processing unit reads the count value recorded by the counting output register, and simu...

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Abstract

The invention relates to a frequency measurement device and a method, belonging to the technical field of a power system. The frequency measurement device comprises a central processing unit, a filter circuit and a timer; the filter circuit and the timer are respectively connected with the central processing unit; the filter circuit is used for converting sine-wave electric signals into square-wave electric signals with the same cycle as the sine-wave electric signals; the timer is used for recording the time of occurrence of turning of the square-wave electric signals; and the central processing unit is used for receiving the square-wave electric signals output by the filter circuit, reading the occurrence time recorded by the timer, determining the turning cycle of the square-wave electric signals, and then determining the frequency of the sine-wave electric signals according to the turning cycle. Since the sine-wave electric signals are converted into the square-wave electric signals within the same cycle as the sine-wave electric signals, and the hardware for capturing the turning of the square-wave electric signals can be realized conveniently and has high processing accuracy and speed, the efficiency of measurement of the frequency of the sine-wave electric signals is increased.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a frequency measurement device and method. Background technique [0002] The frequency of the power system reflects the balance between the active power generated by the generating set and the active power required by the load. The loss of frequency stability will cause the frequency of the power system to collapse and cause the power system to fail to work normally. Therefore, power system frequency stability has been widely concerned by the power engineering community in recent years. [0003] The accuracy of frequency measurement plays an important role in ensuring the operation of modern power systems. However, how to improve the efficiency of frequency measurement still lacks an effective solution. Contents of the invention [0004] The invention provides a frequency measurement device and method, which are used to improve the efficiency of frequency measurement o...

Claims

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Application Information

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IPC IPC(8): G01R23/02
Inventor 刘国营赵长兵常红旗王敬仁欧阳强
Owner 北京德威特电气科技股份有限公司
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