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A switch displacement island detection and direct trip island protection method based on wide-area information

A technology of island detection and switch displacement, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of low sensitivity and no selectivity of anti-island protection actions, and achieve good sensitivity, fast action speed, and reliability. high effect

Active Publication Date: 2015-09-30
SHANDONG UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the islanding detection based on local information, the anti-islanding protection action has no selectivity, and the sensitivity is not high, and proposes a switch displacement islanding detection and direct trip islanding protection based on wide-area information method

Method used

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  • A switch displacement island detection and direct trip island protection method based on wide-area information
  • A switch displacement island detection and direct trip island protection method based on wide-area information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] Implementation Mode 1: Distributed power system such as figure 1 As shown, there are two distributed power sources DG in the system 1 and DG 2 , DG 1 The capacity is 10kW, DG 2 The capacity is 30kW. During normal operation, the Y switch is normally closed and the X switch is normally open. The steps of the wide-area information-based switch displacement island detection method and direct trip island protection are:

[0023] (1) Each FTU monitors the state information of the island-associated switch in real time, and at the same time sets the switch closed state signal to logic "1", and the switch off state signal to logic "0"; define the identity information of the PPC node and the FTU at the exit of each DG And the identity information of the FTU at the contact switch. Switches A and E are the switches at the PCC node, and switch F is the DG 1 Switch at exit, switch G is DG 2 Switch at the exit, switch X is a contact switch.

[0024] (2) When the system is ini...

Embodiment approach 2

[0029] Implementation Mode 2: Distributed power system such as figure 2 As shown, there are two distributed power sources DG in the microgrid system 1 、DG 2 , during normal operation, the X switch is normally open. The steps of the island protection method based on wide-area information direct trip type are:

[0030] (1) Each FTU monitors the state information of the island-associated switch in real time, and at the same time sets the switch closed state signal to logic "1", and the switch off state signal to logic "0"; define the identity of the FTU at the exit of the PPC node and each DG information. Switches A and E are the switches at the PCC node and switch J is the DG 1 Switch at exit, switch L is DG 2 Switch at the exit, switch X is a contact switch.

[0031] (2) When the system is initialized, the DG 1 and DG 2 The FTU at the exit exchanges switch signals with the adjacent FTUs step by step until the signal of the FTU at the PCC node is obtained to identif...

Embodiment approach 3

[0034] Implementation Mode 3: Distributed power system such as figure 1 As shown, there are two distributed power sources DG in the microgrid system 1 、DG 2 , during normal operation, the X switch is normally open. The steps of the island protection method based on wide-area information direct trip type are:

[0035] (1) Each FTU monitors the state information of the island-associated switch in real time, and at the same time sets the switch closed state signal to logic "1", and the switch off state signal to logic "0"; define the identity of the FTU at the exit of the PPC node and each DG information. Switches A and E are the switches at the PCC node and switch F is the DG 1 Switch at exit, switch G is DG 2 Switch at the exit, switch X is a contact switch.

[0036] (2) When the system is initialized, the DG 1 and DG 2 The FTU at the exit exchanges switch signals with the adjacent FTUs step by step until the signal of the FTU at the PCC node is obtained to identify...

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Abstract

The invention relates to a switch displacement island detection and direct-trip island protection method based on wide area information, which belongs to the technical field of power system relay protection. The method comprises the following steps of when the state of a certain island associated switch varies in the grid-connected running processing of a system including DGs (Distributed Generators), making the system perform one-time island detection and judgment; if a certain DG in the system is judged to be in an island running state, starting anti-island protection, and making the DG exit running; otherwise, making the system perform one-time island associated switch path scanning. According to the method, wide area information is acquired automatically by using a feeder line arranged in the system, and each feeder line automatic terminal only needs to exchange a switch state signal with an adjacent feeder line automatic terminal, so that those distributed power supplies in island running can be judged rapidly, and distributed power supplies with islands are protected.

Description

technical field [0001] The invention relates to an island protection method based on wide area information, in particular to a switch displacement island detection method and direct trip island protection based on wide area information, belonging to the technical field of electric power system relay protection. Background technique [0002] Under normal circumstances, after disconnecting from the distribution network, DG (Distributed Generator, DG for short) will lose electrical connection with the distribution network, forming an electrical island. After the island is formed, the power within the island is generally unbalanced, resulting in voltage and frequency fluctuations. If the total capacity of the power supply in the island is much smaller than the total load in the island, the island system cannot operate stably and may collapse rapidly in a short period of time. Islanding operation caused by circuit breaker tripping due to various faults and other reasons will bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 徐丙垠束洪春王敬华董俊蒋彪冯海欧黄文珍
Owner SHANDONG UNIV OF TECH
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