Method and system for detecting zero-crossing point of power frequency voltage
A technology of zero-crossing point detection and power frequency voltage, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of insufficient real-time performance of analog phase-locked loops, and achieve the goal of solving real-time performance insufficiency, reducing design, The effect of improving rapidity
Active Publication Date: 2021-09-03
SUZHOU METABRAIN INTELLIGENT TECH CO LTD
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[0004] In order to solve the above technical problems, the present invention provides a power frequency voltage zero-crossing detection method and system, which solves the problem of insufficient real-time performance of analog phase-locked loops and reduces hardware consumption
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[0035] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the...
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The invention discloses a method for detecting the zero-crossing point of the power frequency voltage, which can obtain the power frequency voltage; perform voltage sampling in each cycle of the power frequency voltage to obtain several sampling points; set the timing period of the free-running timer T1 as T, T is greater than the power frequency voltage cycle; timer T1 records the time t1 at the end of the last sampling point of the power frequency voltage cycle; discrete Fourier transform is performed on the voltage of the sampling point obtained in the power frequency voltage cycle to calculate the initial voltage sampling point Phase angle θ; the calculation of the phase angle θ of the initial voltage sampling point is completed, and the timer T1 records the completion time t2; after recording time t2, calculate the power frequency voltage zero-crossing time t3, and assign t3 to the comparison output register of timer T1; when When the count value of timer T1 is equal to t3, an output comparison interrupt is generated to determine the zero-crossing point of the input voltage. A power frequency voltage zero-crossing point detection system is also provided, which can accurately judge the zero-crossing point of the voltage and improve the rapidity of equipment response.
Description
technical field [0001] The invention relates to the field of electric power commutation, in particular to a method and system for detecting a power frequency voltage zero-crossing point. Background technique [0002] With the improvement of users' demand for power quality and the development of power technology, people's requirements for power quality in daily power consumption are increasing. At present, various schemes have been proposed for terminal voltage control, and the power commutator has become an important Applied device for regulating unbalanced three-phase voltage. The commutator needs to be turned on at zero voltage and turned off at zero current, which requires locking the zero-crossing point of the power frequency voltage, and accurately and quickly controlling the switching of the commutation switch at the zero-crossing point of the voltage. [0003] However, at present, the analog phase-locked loop technology is mostly used to realize this function. The ph...
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IPC IPC(8): G01R19/175
CPCG01R19/175
Inventor 赵燕燕
Owner SUZHOU METABRAIN INTELLIGENT TECH CO LTD