Distribution network protection method taking randomness of photovoltaic power station into consideration

A photovoltaic power station and distribution network technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems such as randomness
CN102709890AInactive Publication Date: 2012-10-03STATE GRID SHANDONG ELECTRIC POWER +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID SHANDONG ELECTRIC POWER
Publication Date
2012-10-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

A distribution network protection method taking the randomness of a photovoltaic power station into consideration mainly solves the problems that conventional distribution network protection equipment is seriously affected in protection range, selectivity, sensitivity and reliability after being accessed into a distributed power supply. The method comprises the following steps: dividing the distribution network into areas, and real-timely monitoring the current output by each area; building a dynamic Thevenin equivalent parameter model of the distributed power supply; detecting faults of the distribution network; positioning and separating the fault area; and reclosing to resume power supply. The method is not affected by the access number, capacity and positions of the distributed power supplies, such as the photovoltaic power station, can realize fault detection, fault area positioning and separating, reclosing and power supply resuming quickly and reliably, is not only suitable for the requirement of large-capacity DG injection in the future and can reliably work when large-capacity DG is injected, but also suitable for the distributed power supply with large output random variation, and has the characteristic of shorter time in cutting off instant faults.
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Description

technical field

[0001] The invention relates to the technical field of power system distribution network protection, in particular to a distribution network protection method considering the randomness of a photovoltaic power station. Background technique

[0002] With the access of a large number of distributed power sources, the network structure of the distribution network will change from a radiating single power source to a dual power source, or even a complex topological structure where multiple power sources and loads coexist. Therefore, the protection scope and selection of the original feeder protection The performance, sensitivity, and reliability will be seriously affected, which will cause the protection device to malfunction or refuse to operate, seriously affect the safe and stable operation of the distribution network, and greatly reduce the reliability of power supply.

[0003] Scholars at home and abroad have done a lot of work on the hot issue of distributi...

Claims

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