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A Instantaneous Voltage dq Decomposition Method Used in Grid Voltage Drop Detection

A technology of instantaneous voltage and grid voltage, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve problems such as adverse effects of real-time control, and achieve the effects of cost reduction, good dynamic performance, and improved real-time performance.

Active Publication Date: 2021-07-16
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to the phase-shifting operation, when the voltage signal sags, the fictitious voltage amplitude change needs to be delayed by 1 / 6 of the power frequency cycle to be detected. The theoretical delay is 3.33ms, which has an adverse effect on real-time control.

Method used

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  • A Instantaneous Voltage dq Decomposition Method Used in Grid Voltage Drop Detection
  • A Instantaneous Voltage dq Decomposition Method Used in Grid Voltage Drop Detection
  • A Instantaneous Voltage dq Decomposition Method Used in Grid Voltage Drop Detection

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Embodiment Construction

[0043] What described in above-mentioned embodiment and description only illustrates the principle and preferred embodiment of the present invention, under the premise of not departing from the spirit and scope of the present invention, the present invention also can have various changes and improvements, and these changes and improvements all fall into within the scope of the claimed invention.

[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Experimental conditions: Let the mathematical analysis expression of the detected voltage signal be:

[0046]

[0047] Voltage u a In 0.04 ~ 0.12s, a jump of 50% of the amplitude sag occurred, and the duration was 4 power frequency cycles. The sampling frequency of the signal is 3.2kHz, that is, 64 data are sampled in each signal period. Such as figure 1 As shown, it is the overall flow chart of the system; the specific impleme...

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Abstract

The invention discloses an instantaneous voltage dq decomposition method for grid voltage drop detection, which relates to the field of voltage drop detection. By fabricating single-phase system voltage signals and using the space vector superposition principle, the currently commonly used grid voltage drop detection method is Algorithm, instantaneous voltage dq decomposition method is improved, so that the delay time of the above method is further shortened. Under the power frequency condition, the present invention has a theoretical delay time of 0.83ms and an actual delay time of only 0.9375ms compared with 3.33ms of the instantaneous voltage dq decomposition method, and the real-time performance is greatly improved. The invention adopts the single-phase voltage signal to fabricate a multi-phase system, thereby reducing the number of AC voltage sensors and reducing the cost. The algorithm of the invention is simple, practical, good in dynamic performance, and has strong engineering practical effect.

Description

technical field [0001] The invention relates to the field of voltage drop detection, in particular to an instantaneous voltage dq decomposition method for grid voltage drop detection. Background technique [0002] With the rapid development of the global economy, the problems of energy shortage and environmental pollution are becoming more and more serious. Renewable energy sources such as photovoltaic power generation and wind power generation, which are energy-saving, emission-reducing, and green and low-carbon, have received more and more attention and development. However, the inherent randomness and volatility of renewable energy make the problem of power quality more prominent, especially the problem of voltage stability under high penetration rate. [0003] At the same time, among many power quality problems, voltage sag is one of the most serious power quality problems, which can account for more than 80% of the entire power quality problem. No quality issues. In r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165
CPCG01R19/16528
Inventor 吴宁肖静韩帅冯玉斌陈卫东郭敏
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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