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Voltage sag detection method for cascade type electric energy quality comprehensive treatment device

A technology for power quality and comprehensive management, applied in the direction of measuring devices, measuring current/voltage, measuring only voltage, etc., can solve problems such as direct and indirect economic losses, abnormal operation of sensitive load equipment, etc.

Active Publication Date: 2021-09-10
STATE GRID HUBEI ELECTRIC POWER RES INST +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] These sensitive loads are very sensitive to power quality, and voltage mutations of several to dozens of cycles will cause abnormal operation of sensitive load equipment, resulting in a chain reaction of user-side electrical equipment, resulting in huge direct and indirect losses. Economic losses

Method used

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  • Voltage sag detection method for cascade type electric energy quality comprehensive treatment device
  • Voltage sag detection method for cascade type electric energy quality comprehensive treatment device
  • Voltage sag detection method for cascade type electric energy quality comprehensive treatment device

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Embodiment Construction

[0045] In order to make the objects, technical solutions, and advantages of the present invention more clearly, the technical solutions in the embodiments of the present invention will be described in contemplation in the embodiments of the present invention, and will be described, and the embodiments described in the embodiments of the present invention will be described. It is a part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative labor are the scope of the present invention.

[0046] See figure 1 The present invention provides a cascade voltage power quality management means sag detection method comprising the steps of:

[0047] A step of three-phase grid voltage is sampled, obtaining the instantaneous value of the grid voltage three-phase signal;

[0048]Specifically, by the voltage sensor, the grid three-phase phase v...

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Abstract

The invention provides a voltage sag detection method for a cascade type electric energy quality comprehensive treatment device. The method comprises the following steps: 1, acquiring a three-phase phase voltage instantaneous value signal of a power grid; 2, calculating a power grid voltage phase angle and a voltage component of the three-phase phase voltage of the power grid in an alpha-beta rotating coordinate system according to the instantaneous value signal of the three-phase phase voltage of the power grid; 3, calculating a voltage component under a positive and negative sequence dq coordinate system according to a result obtained by calculation in the step 1, and obtaining positive and negative sequence fundamental wave components through positive and negative sequence decoupling and high-frequency filtering; 4, according to the positive sequence fundamental component and the negative sequence fundamental component, calculating negative sequence fundamental component angle characteristic quantity and three-phase power grid voltage positive sequence fundamental component amplitude modulus length, and obtaining a characteristic value based on a voltage sag voltage threshold value; and 5, according to the negative sequence fundamental component angle characteristic quantity, the three-phase power grid voltage positive sequence fundamental component amplitude modulus length and the characteristic value, determining the power grid voltage sag and the type thereof. The method can be realized by software, the algorithm is simple, the effect is obvious, and engineering application is facilitated.

Description

Technical field [0001] Technical Field The present invention relates to power electronic control device, in particular a cascade for voltage control power quality detection means sag. Background technique [0002] Currently, with the rapid development of industrial automation technology, put into operation in a wide variety of sensitive user load, as well as a large number of new technology products in the high standard of living in a wide range of applications, power quality more stringent. [0003] The sensitivity of the sensitive load is very high power quality, several to several tens of cycles voltage mutations cause abnormal operation of the load-sensitive device, the user-side electrical equipment to produce a chain reaction, resulting in enormous direct and indirect Economic losses. Wherein the voltage sag event is one of the most prominent power quality problems and the most prone to the types of problems. [0004] Therefore, rapid and accurate detection of power supply ...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/0084
Inventor 胡伟沈煜杨帆杨志淳宿磊雷杨王文烁蒋伟
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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