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Method and system for high-speed voltage drop detection

A technology of voltage drop and detection method, which is applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve problems such as unfavorable power quality equipment, and achieve the effect of improving system speed

Inactive Publication Date: 2013-04-03
NANJING ANZHAO POWER ELECTRONICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This is not good for power quality equipment to achieve fast voltage compensation

Method used

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  • Method and system for high-speed voltage drop detection
  • Method and system for high-speed voltage drop detection

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with various embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

[0036] ginseng figure 1 As shown, a high-speed voltage drop detection method of the present invention specifically includes:

[0037] S1. Sampling the instantaneous value U of the three-phase voltage at time T1 x , see figure 2 The x shown is A, B or C phase;

[0038] S2. Predict and detect whether the voltage drops at the same time, and the prejudgment time is shorter than the detection time. The detection algorithm used to detect whether the voltage drops is a three-phase voltage drop detection algorithm based on a single-phase voltage detection method, or a three-phase improved dq voltage drop detection algo...

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Abstract

The invention provides a method and system for high-speed voltage drop detection. The method includes: step one, sampling a three-phase voltage instantaneous value; step two, simultaneously anticipating and detecting whether voltage drops; and step three, judging whether a anticipating result is correct according to a detection result. The method and system for the high-speed voltage drop detection is provided with an instantaneous anticipating function on the basis of a traditional voltage drop detection method. Through rapid anticipating, pre-movement time can be given to a device, and system speed is improved. When anticipating goes wrong, the system can return to the normal operation condition rapidly through a reasonable control process, no injurious effect is led to normal operation of a load.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to a high-speed voltage drop detection method and system. Background technique [0002] Voltage sags and short voltage interruptions account for about 90% of all power quality problems. Siemens company has studied the impact of voltage sag (sag) on ​​electronic equipment widely used in modern society. The research results show that voltage sag exceeds a power frequency cycle, which will have a significant impact on some sensitive loads. In order to solve the voltage drop problem, researchers have designed various related power quality equipment, such as UPS, solid-state switches, dynamic voltage compensation devices, etc. The rapidity of voltage sag detection algorithms is critical to the performance of power quality related equipment. [0003] IEEE related standards define a voltage drop as an amplitude per unit value between 0.1 and 0.9, and a duration of half a...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 彭宇
Owner NANJING ANZHAO POWER ELECTRONICS
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