A Method for Quickly Detecting Abnormal Voltage of Three-phase Mains

A technology of abnormal voltage and capacitor voltage, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve problems affecting the normal operation of loads, long detection time, excessive fluctuations in capacitor voltage, etc.

Active Publication Date: 2021-09-10
佛山市华葆电源设备有限公司
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Problems solved by technology

It is critical to quickly detect the abnormality of the mains voltage. However, the detection technology in the prior art uses the effective value of the mains to calculate, and then judges whether the mains voltage is abnormal according to the calculation result of the effective value of the mains. The effective value of the mains needs at least half a cycle, and the detection time is too long, which causes the BUS capacitor voltage to fluctuate too much, and the converted AC output voltage fluctuates too much, which affects the normal operation of the load

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  • A Method for Quickly Detecting Abnormal Voltage of Three-phase Mains

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Embodiment Construction

[0017] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0018] In an embodiment, when there is an abnormal power failure in the mains voltage, a method for quickly detecting the abnormality of the three-phase mains voltage, defining the three-phase mains voltage, according to the AC voltage amplitude A and the mains cycle 1 / f and ω=2πf List three voltage rms expressions, which are with The method includes:

[0019] A. Define a new variable Udc(t) by the effective value of the voltage, list the expression of the variable Substituting the three effective value expressions of the voltage into the expression of the variable, and simplifying the product and difference formula of the trigonometric function, the simplified expression of the variable is obtained The simplified expression of the variable is a DC quantity, which is only related to the AC voltage amp...

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Abstract

A method for quickly detecting the abnormality of three-phase mains voltage. Define a new variable through the effective value of the voltage, list the expression of the variable, and substitute the expressions of the three effective values ​​of the voltage into the expression of the variable to obtain only the sum of the AC voltage It is related to the amplitude and has nothing to do with the simplified expression of the mains cycle variable. The simplified expression of the variable is a DC quantity. The value of the variable is compared with the normal value of the mains voltage. The value of the variable is greater than the maximum allowable value, or less than the allowable value Minimum value, the mains voltage is abnormal. This detection method converts the detection of three AC variables into the detection of one DC quantity, which reduces the detection time from the mains power failure to the rectifier working, turns on the rectifier in time, and reduces the BUS capacitance that is always given due to no energy input. The magnitude of the voltage reduction caused by the load power supply reduces the fluctuation of the BUS capacitor voltage, which in turn reduces the fluctuation of the AC voltage converted by the inverter, improves the stability of the power supply to the load, and provides high-quality AC power for the load.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to a method for quickly detecting abnormal voltages of three-phase commercial power. Background technique [0002] UPS, uninterruptible power supply, is a system device that connects batteries (mostly lead-acid maintenance-free batteries) with the host, and converts direct current into commercial power through modular circuits such as the host inverter. UPS provides customers with uninterrupted power supply. When the mains power is abnormal, it needs to cut off the AC input and switch to DC power supply. It is critical to quickly detect the abnormality of the mains voltage. However, the detection technology in the prior art uses the effective value of the mains to calculate, and then judges whether the mains voltage is abnormal according to the calculation result of the effective value of the mains. The effective value of the mains needs at least half a cycle, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165H02J9/06
Inventor 封宁波
Owner 佛山市华葆电源设备有限公司
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