A Pilot Protection Method for Short Circuit Faults in DC Power Distribution System

A short-circuit fault and longitudinal protection technology, which is applied in the direction of emergency protection circuit devices and electrical components, can solve problems such as the lack of practical experience and standards for protection configuration of DC power distribution systems, and achieve high reliability and fast action speed

Inactive Publication Date: 2017-11-14
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on DC distribution protection technology is still in its infancy, and there is no practical experience and standards for DC distribution system protection configuration.

Method used

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  • A Pilot Protection Method for Short Circuit Faults in DC Power Distribution System
  • A Pilot Protection Method for Short Circuit Faults in DC Power Distribution System
  • A Pilot Protection Method for Short Circuit Faults in DC Power Distribution System

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] The topology diagram of a typical DC power distribution system is attached figure 1 As shown, a 10kV AC system is used as the main power supply, which is rectified into 10kV DC by a power distribution converter station composed of a 10 / 3.8kV transformer and a rectifier, and directly connected to the 10kV DC bus; the system feeder line is divided into three sections, and the load It is connected to the DC bus through a DC cable; the system is also connected to a photovoltaic power supply, and its interface circuit is a DC / DC converter, and it adopts maximum power tracking control. The principle of longitudinal protection for DC lines based on current mutations in DC power distribution systems of the present invention uses the DC current information collected at the head end and end of each DC line, and is based on a hybrid DC circuit breaker, using the ...

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Abstract

The present invention proposes a longitudinal protection method for short-circuit faults in DC power distribution systems, including: Step 1: Calculate the DC current change rate di / dt according to the collected DC current information at the head end and end of the DC line, and judge the current Whether the rate of change exceeds the setting value, if it exceeds, start the fault identification program and enter step 2, otherwise, the protection fault identification program does not start; If the current sudden change is greater than the line end protection setting value, it is determined that the DC line is short-circuited, and the DC circuit breaker of the DC line is tripped. This protection method uses a simple protection principle, good rapidity and high reliability when a fault occurs, and is not affected by transition resistance and system operation mode, providing technical support for the safe and reliable operation of the DC power distribution system.

Description

Technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a protection method for short-circuit faults of DC power distribution systems. Background technique [0002] Smart grid is the latest trend in the development and transformation of the power system in the world today, and it is a major technological innovation and development trend of the power system in the 21st century. The future development direction of the smart grid is mainly concentrated in the distribution network, and the forward-looking research in the field of distribution network is being actively carried out internationally. [0003] At present, more and more household appliances and office appliances are based on electronic products, and the final form of power consumption is DC, such as mobile phones, LCD monitors, computers, electric vehicles, etc.; increasing household loads and industrial loads use frequency conversion technology to impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 薛士敏高峰孙文鹏齐金龙李博通
Owner TIANJIN UNIV
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