Transient voltage dq resolving method for 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 real-time improvement

Active Publication Date: 2019-10-29
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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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.

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  • Transient voltage dq resolving method for grid voltage drop detection
  • Transient voltage dq resolving method for grid voltage drop detection
  • Transient voltage dq resolving method for grid voltage drop detection

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Embodiment Construction

[0043] What described in above-mentioned embodiment and description just illustrate the principle of the present invention and preferred embodiment, 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 cycle. Such as figure 1 As shown, it is the overall flow chart of the system; the specific implement...

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Abstract

The present invention discloses a transient voltage dq resolving method for grid voltage drop detection, and relates to the field of voltage drop detection. A single-phase system voltage signal is virtualized, and a space vector superposition principle is used, to improve a grid voltage drop detection algorithm and a transient voltage dq resolving method that are currently commonly used, so that adelay time of the foregoing method is further shortened. In a power frequency condition, compared with 3.33 ms in the transient voltage dq resolving method, a theoretical delay time of the present invention is 0.83 ms, and an actual delay time is only 0.9375 ms, so that instantaneity is substantially improved. According to the method, a multiphase system is virtualized by using a single-phase voltage signal, the quantity of alternating current voltage sensors is reduced, and costs are lowered. The present invention is simple in algorithm, practical, and good in dynamic performance, and has astrong engineering practice function.

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...

Claims

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Application Information

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Patent Type & Authority Applications(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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