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Layered protecting configuration of outdoor low-voltage distribution area active compensation device and fault handling method

A fault handling method and low-voltage station area technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as reactive power and unbalanced comprehensive compensation functions, and achieve the effect of improving intelligence, improving effectiveness and reliability

Inactive Publication Date: 2015-08-05
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

The conventional method of using capacitor switching to control the power quality of the station area can no longer meet the demand. The outdoor low-voltage station area active compensation device using IGBT has comprehensive compensation functions for reactive power, harmonics and unbalance. Due to its performance advantages, it will be expected Replacing the conventional capacitive switching compensation device for large-scale application

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  • Layered protecting configuration of outdoor low-voltage distribution area active compensation device and fault handling method
  • Layered protecting configuration of outdoor low-voltage distribution area active compensation device and fault handling method

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with accompanying drawings and examples. It should be emphasized that the following description is illustrative only and not intended to limit the scope of the invention and its application.

[0018] figure 1 It is the structure diagram of the main circuit of the active compensation device in the outdoor low-voltage station area of ​​this embodiment, in which 2QF is a grid-connected switch.

[0019] Figure 2 is a flow chart of layered protection configuration and fault processing signals for active compensation devices in outdoor low-voltage station areas. It can be seen from Figure 2 that:

[0020] Such as figure 1 As shown, 4 pairs of IGBT tubes form a three-phase four-wire inverter circuit. The DC side uses electrolytic capacitors, and the DC voltage signal is collected by the Hall sensor. RD1-RD4 are fast fuses for over-current protection, and CT1-CT4 are Hall sensors are used for output current...

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Abstract

The invention provides a layered protecting configuration of an outdoor low-voltage distribution area active compensation device and a fault handling method. The protecting configuration is composed of three layers, namely a component grade, a device grade and a system grade. According to the fault handling method, according to different layers of the layered protecting configuration of the outdoor low-voltage distribution area active compensation device, different protecting signal handling modes and different fault handling modes are correspondingly adopted. The fault handling modes are composed of a mode for instantaneous recoverable faults and a mode for unrecoverable faults. After a fault output causes IGBT pulse blocking or grid-connecting switch tripping, a fault output signal is acquired in real time. When the fault output signal is eliminated, the instantaneous recoverable fault which is caused by an external reason is determined. When IGBT pulse blocking occurs, pulse blocking is eliminated after one-minute time delay. When grid-connecting switch tripping occurs, the grid-connecting switch is automatically switched on after 10-minute time delay, and the device operates again. According to the layered protecting configuration, software analysis is combined with hardware determination, and high complexity in operation of a distribution network is sufficiently considered, thereby effectively improving operation reliability of the outdoor low-voltage distribution area active compensation device.

Description

technical field [0001] The present invention relates to a layered protection configuration and fault handling method for an active compensation device in an outdoor low-voltage station area, which belongs to the field of power electronics technology. Background technique [0002] With the development of the power grid and the improvement of people's living standards, on the one hand, the load in the distribution network area is becoming more and more complex, which brings a lot of reactive power, harmonics and imbalance problems; on the other hand, the sensitive load of users is also increasing day by day. The requirements for power quality are getting higher and higher. The conventional method of using capacitor switching to control the power quality of the station area can no longer meet the demand. The outdoor low-voltage station area active compensation device using IGBT has comprehensive compensation functions for reactive power, harmonics and unbalance. D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
Inventor 范瑞祥邓才波徐在德潘本仁肖红霞
Owner STATE GRID CORP OF CHINA
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