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Power distribution network inverse time limit overcurrent protection

An inverse time, overcurrent technology, applied in emergency protection circuit devices, photovoltaic power generation, wind power generation and other directions, can solve the problems of distribution network relay protection no longer applicable, complex fault characteristics of micro power supply, and complex protection implementation, etc. Good application value, improved action time, improved action characteristics

Inactive Publication Date: 2017-06-20
魏莹
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Problems solved by technology

[0004] Compared with the traditional distribution network, the distribution network containing micro-power sources, lines and loads has a certain independent operation capability, but the existence of micro-power sources and complex fault characteristics have brought new problems to the original protection configuration. Make traditional distribution network relay protection no longer applicable
Combining the microgrid structure and fault characteristics, a microgrid inverse time low impedance protection based on load impedance is proposed, but the protection is complicated to implement and has low reliability

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Embodiment Construction

[0016] specific implementation plan

[0017] figure 1 Among them, E is the system power supply, and DG is the distributed power supply connected to the distribution network.

[0018] (1) For DG downstream protection 2 and protection 3, after connecting to DG, the distribution line is still a single-side power supply radial distribution network, which is set according to the traditional inverse time overcurrent protection setting principle, and protection 2 and 3 The action time can be coordinated to meet the requirements of relay protection for selectivity and quick action.

[0019] (2) For DG upstream protection 1 and downstream protection 2, after connecting DG: when line L2 fails, DG will provide boosting current IDG to protection 2, and the fault current Ik2 flowing through protection 2 is the fault current Ik2 flowing through protection 1 If the sum of fault current Ik1 and IDG is greater than Ik1, the time coordination between protection 1 and protection 2 will be affe...

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Abstract

Power distribution network inverse time limit overcurrent protection comprises three parts: a distributed power distribution system, a communication system and low-voltage acceleration inverse time limit overcurrent protection. The invention provides a low-voltage acceleration inverse time limit overcurrent protection cooperative scheme. The low-voltage acceleration inverse time limit overcurrent protection is applied to a distribution network with DG so as to accelerate the action time of the inverse time limit overcurrent protection, especially to improve the action time to protect the outlet failure, to eliminate the influence of low-voltage acceleration factor on the action time limit, to ensure the cooperation of the upper and lower protection action time limit. The implementation of the program can effectively improve the cooperative characteristic of the action characteristics and protection of the application of the inverse time limit overcurrent protection in a microgrid, and has a good application value.

Description

[0001] Technical field [0002] The invention relates to a distribution network protection, in particular to a distribution network inverse time overcurrent protection. Background technique [0003] With the improvement of the intelligence level of the power grid, micro-grid technology has developed rapidly, and distributed generation DG (Distributed Generation), including photovoltaic cell power generation, wind power generation, and energy storage technology, has been widely used in the distribution network. The microgrid is composed of load, micro power supply and energy storage device, which can provide electric energy and heat energy at the same time. The internal power supply of the microgrid is mainly converted by the load energy of the power electronic device, and provides the necessary control and interface. Microgrids can be divided into two types: AC and DC. Since the traditional large grid exists in the form of AC, AC microgrids are currently being studied more. H...

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Application Information

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IPC IPC(8): H02J3/38H02H7/26
CPCH02H7/261H02J3/383H02J3/386Y02E10/56Y02E10/76
Inventor 魏莹
Owner 魏莹
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