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Pilot protection method for short-circuit fault of DC power distribution system

A short-circuit fault and longitudinal protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of lack of practical experience and standards of protection configuration of DC power distribution system, and achieve the effect of high reliability and fast action speed.

Inactive Publication Date: 2015-12-16
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Pilot protection method for short-circuit fault of DC power distribution system
  • Pilot protection method for short-circuit fault of DC power distribution system
  • Pilot protection method for short-circuit fault of 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 invention proposes a pilot protection method for a short-circuit fault of a DC power distribution system. The pilot protection method comprises the following steps of: 1, calculating DC current change rate di / dt according to acquired DC current information of a head end and a tail end of a DC circuit, judging whether the current change rate is beyond a set value, if yes, starting a fault distinguishing procedure to enter step 2, or protecting the fault distinguishing procedure from being started; and 2, determining the short-circuit fault of the DC circuit and tripping a DC circuit breaker of the DC circuit if the current jump value of the head end of the circuit is greater than the protected set value of the head end of the circuit and the current jump value of the tail end of the circuit is greater than the protected set value of the tail end of the circuit. In the protection method, the used protection principle is simple, and favorable rapidness and high reliability during the fault are achieved; and meanwhile, the protection method is prevented from being affected by a transition resistor and a system running mode, and a technical support is provided for safe and reliable running 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 Applications(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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