Three-phase input voltage phase sequence online detection method applied to UPS
A technology of input voltage and detection method, which is applied in the direction of phase sequence/synchronous indication, etc., can solve the problems of complex phase sequence measurement method, inaccurate phase measurement, and unintuitive measurement results, so as to reduce computing overhead and memory usage , the effect of reducing overhead
Active Publication Date: 2020-04-24
厦门市爱维达电子有限公司
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The traditional phase sequence measurement method is complex and difficult to master, and the phase measurement is not accurate and the measurement results are not intuitive
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[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0022] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] refer to Figure 1-6 As shown, the present invention discloses a phase sequence online detection method applied to UPS three-phase input voltage, including the following steps: start the UPS, and after the ...
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The invention provides a three-phase input voltage phase sequence online detection method applied to a UPS. The method comprises the following steps: starting a UPS, and after a DSP sampling channel is initialized and calibrated, capturing a bypass signal through a CAP capturing unit of the DSP, obtaining a frequency signal input by a current bypass, calling a CAP processing function, and obtaining the access frequency of the current bypass through calculation; setting a fundamental frequency of a digital phase-locked program according to the bypass frequency, calling the digital phase-lockedprogram, and carrying out phase-locked tracking on the bypass; and if digital phase locking of the bypass fails, negating the fundamental frequency, continuing the phase locking operation, and when the phase locking process is completed, and judging the bypass three-phase input phase sequence according to the positive or negative bypass frequency obtained by phase locking. According to the three-phase input voltage phase sequence online detection method, the digital phase locking program is directly used for judging the phase sequence, the access phase sequence of the current system bypass canbe accurately detected without errors, an extra phase sequence detection program does not need to be written, and the DSP operation overhead and memory occupation are reduced.
Description
technical field [0001] The invention relates to the field of three-phase AC voltage phase sequence detection, in particular to an online phase sequence detection method applied to UPS three-phase input voltage. Background technique [0002] The phase sequence detector is a necessary equipment for the power supply and distribution department. All irreversible electromechanical products should also have a phase sequence detection circuit, a phase sequence locking circuit, and even a constant phase sequence output circuit to ensure that the equipment is normal under the premise of correct phase sequence. run. The traditional phase sequence measurement method is complex and difficult to master, and the phase measurement is not accurate and the measurement results are not intuitive. [0003] As for the phase sequence detection method, there are those that are directly detected by hardware, and those that are judged by software algorithms. Among them, there are complex algorithm...
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Login to View More IPC IPC(8): G01R29/18
CPCG01R29/18
Inventor 晏东陈一逢
Owner 厦门市爱维达电子有限公司