An integrated protection method for distribution network suitable for distributed power access

A distributed power supply and distribution network technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as high cost and non-compliance, reduce the impact of short-circuit distribution networks, enhance practicability, and avoid large-scale The effect of transformation

Active Publication Date: 2017-01-18
STATE GRID CORP OF CHINA +2
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  • Claims
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Problems solved by technology

The above method is not in line with the national policy of supporting distributed power access to the distribution network, or requires large-scale transformation of the distribution network, which is costly and only applicable in special cases such as the access of distributed power dedicated lines

Method used

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  • An integrated protection method for distribution network suitable for distributed power access
  • An integrated protection method for distribution network suitable for distributed power access
  • An integrated protection method for distribution network suitable for distributed power access

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Embodiment

[0042] 1. If figure 1 As shown, when the end of the line BC is faulty, the access of the distributed power source reduces the fault current detected by the upstream line current protection A; and increases the fault current detected by the downstream line current protection B. At this time, in the two situations before and after the distributed power supply is connected, it is still necessary to ensure that the current protection can operate reliably. According to the power grid structure of the local distribution network, combined with the access of distributed power, two sets of fixed values ​​are calculated respectively: one set is not connected to the inverter-type distributed power (DG), and the network equivalent value is used The system parameters are obtained by the simple method, and the protection setting value obtained by using the conventional distribution network stage current protection setting method; the other group is the current protection of the distribution...

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Abstract

The invention provides a power distribution network integrated protection method suitable for access of distributed power supplies. The method includes the following steps that a power distribution network current protection constant value with the access of the inverter-type distributed power supplies reckoned in and a power distribution network current protection constant value with the access of the inverter-type distributed power supplies not reckoned in are calculated respectively; the two calculated distribution network current protection constant values are loaded into a local protector, and whether the two calculated distribution network current protection constant values meet detection limits or not is judged. According to the method, influence of the access of the photovoltaic distributed power supplies with different capacities on power distribution network current fault characteristics is taken into account; by adopting corresponding adaptive adjustment constant values based on local information in power distribution network current protection, faults can be quickly removed, influence of short circuit on a power distribution network is alleviated, large-scale reconstruction of the power distribution network is avoided, and good current protection performance can be achieved without communication or non-real time communication; the method is strong in feasibility, reduces investment and has high practicability in engineering practice.

Description

technical field [0001] The invention belongs to the technical field of distribution network relay protection, in particular to a protection method for an inverter-type distributed power source connected to a distribution network. Background technique [0002] Distributed generation (DG) makes full use of renewable energy, has good environmental friendliness, and has become an important form of electric energy. For the power distribution system with distributed power, due to the randomness of its power output, it will make it difficult to set the fixed value of the traditional current protection. Existing methods mainly include restricting the access scale of distributed power sources or prohibiting reverse current, and adopting methods such as longitudinal protection based on optical fiber and other communication channels (such as optical fiber longitudinal differential protection). The above method is not in line with the national policy of supporting distributed power acc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 李伟杨国生周泽昕王兴国杜丁香李仲青王晓阳王文焕姜宪国
Owner STATE GRID CORP OF CHINA
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