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A method and system for regional current protection of electric vehicles connected to distribution network

A technology for current protection and electric vehicles, which is applied in the direction of emergency protection circuit devices, electrical components, etc., and can solve problems such as mismatching of the backup section of current protection

Active Publication Date: 2020-07-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a current protection method and system for electric vehicles connected to the distribution network area to solve the mismatch problem between the current protection backup sections caused by the large-scale penetration of the existing electric vehicles into the distribution network

Method used

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  • A method and system for regional current protection of electric vehicles connected to distribution network
  • A method and system for regional current protection of electric vehicles connected to distribution network
  • A method and system for regional current protection of electric vehicles connected to distribution network

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Embodiment 1

[0046] A specific embodiment of the present invention discloses a current protection method for an electric vehicle connected to a distribution network area. The flow chart is as follows figure 1 shown, including the following steps:

[0047] Step S1: When the distribution network fails, collect the current value on each feeder; specifically, if it is detected that the current value flowing through a certain point in the distribution network is much greater than the current value during normal operation, the distribution network A malfunction has occurred.

[0048]Step S2: Compare the current value on each feeder with the current setting value, and judge whether the current protection sections II and III of each feeder are activated; specifically, for the protection on each feeder, if the current value is greater than the current protection If the setting value of section II, the current protection section II starts; if the current value is greater than the setting value of t...

Embodiment 2

[0071] In Embodiment 2 of the present invention, the specific process of using the above method to realize current protection is given, and an IEEE 33 node standard power distribution system is built on the RTDS platform, such as Figure 4 shown. Five charging stations are connected to different locations in the system, and the maximum charging capacity of each station is 1.8MW. The regional host is set on the power node 1, and the starting information of all protected current segments II and III of the power distribution system are uploaded to this regional host.

[0072] (1) Regional current protection scheme verification

[0073] on line L 8-9 F at 70% of upper distance protection 1 A three-phase short circuit occurs at the point, according to the formula (8), the starting conditions of each protection and the results of the regional current protection criterion are shown in Table 2. It can be seen from the table that the domain hosts contribute to the protection R 8-9...

Embodiment 3

[0088] In Embodiment 3 of the present invention, a current protection system for connecting electric vehicles to the distribution network area is also disclosed, such as Figure 5 As shown, it includes: a data acquisition module, a start information acquisition module, a regional host identification module, a circuit breaker set on each feeder and close to the starting bus position of the feeder; wherein, the data acquisition module is used for power distribution When a network failure occurs, collect the current value on each feeder; the start information acquisition module is used to receive the current value on each feeder sent by the data acquisition module, and compare the current values ​​on each feeder and the current setting value to judge whether the current protection section II and III section of each feeder are started; the regional host identification module is used to receive the start information of the current protection section II and III section of each feeder...

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Abstract

The invention relates to a regional current protection method and system for a power distribution network accessed by electric automobiles, which belongs to the technical field of relay protection fora power system and solves the problem of mismatch between current protection backup sections caused by the large-scale penetration of electric automobiles into the distribution network in the prior art. The method comprises the steps of collecting the current value on each feeder line when the power distribution network breaks down; comparing the current value on each feeder line with a current setting value, and judging whether the current protection section II and the current protection section III of each feeder line are started or not; performing criterion calculation on the current protection on each feeder line by using a protection criterion according to the current protection starting information of each feeder line, and sending an action instruction to a circuit breaker on the feeder line according to the criterion calculation result so as to be executed by the circuit breaker. The method effectively solves the problem of upper and lower protection mismatch in the traditionalcurrent protection of the power distribution network, is not limited by factors such as the charging capacity of the electric automobile, the number and position of charging facilities and can stillcorrectly identify the fault section under the condition that the information is partially lost or incorrect.

Description

technical field [0001] The invention relates to the technical field of relay protection for electric power systems, in particular to a method and system for current protection in an area where an electric vehicle is connected to a distribution network. Background technique [0002] The large-scale access of electric vehicles not only has a profound impact on the operation mode and network structure of the distribution network, but also plays a decisive role in the distortion characteristics of the electrical quantity when the distribution line fails. With the increasing penetration of electric vehicles in the distribution network, traditional relay protection schemes will face severe challenges. Therefore, it is urgent to study and propose a new method of distribution network protection suitable for large-scale electric vehicle access. [0003] Existing protection schemes mainly focus on limiting access capacity schemes, adaptive protection schemes, and fault location schem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/262H02H7/263
Inventor 马静刘静李沛王瑞峰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)