Power distribution network automatic reclosing control method suitable for distributed power source connection

Abstract

The invention discloses a power distribution network automatic reclosing control method suitable for distributed power source connection. The method comprises the following steps: collecting fault detection information uploaded by various scattered intelligent protecting terminals (Intelligent Electronic Device, IED) to form a fault information matrix, and determining a fault line section by a network topological structure matrix of the power distribution network; forming a distributed power source trip matrix according to a fault section position, a distributed power source connection point position and a used reclosing mode, and stopping running of related distributed power sources; and further forming a reclosing matrix on this basis, and realizing closing control of related circuit breakers accordingly. By the power distribution network automatic reclosing control method disclosed by the invention, impact current generated due to nonsynchronous closing after the distributed power sources are connected into the power distribution network can be avoided effectively, and the utilization rate of the distributed power sources and power supply reliability of a power grid are improved.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and in particular relates to an automatic reclosing control method of a distribution network suitable for accessing distributed power sources. Background technique [0002] Most of the short-circuit faults in the actual power grid are line faults, and they are mainly "transient faults". For transient faults, when the fault line is quickly disconnected by the relay protection, the arc is extinguished, and the insulation strength of the fault point is restored. At this time, the circuit breaker can be automatically reclosed to restore normal power supply. Therefore, when a transient fault occurs on the line, automatic reclosing can greatly improve the reliability and continuity of power supply, and thus has been widely used in power systems. [0003] With a large number of distributed generation (DistributedGeneration, DG) connected to the distribution network, the original single-...

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Problems solved by technology

[0003] With a large number of distributed generation (DistributedGeneration, DG) connected to the distribution network, the original single-power radiation network is transformed into a multi-power supply network. If the original reclosing method suitable for single-ended power is still used, the distribution The automatic reclosing of the power grid brings the following problems: On the one hand, because the radial network of the traditional single-ended power supply adopts the non-periodic reclosing mode, after the distributed power supply is connected, if the system power supply and the distributed power supply access point If a fault occurs on the line, at this time, the non-synchronous reclosing will generate a large inrush current, which will have a serious impact on the safe operation of the power grid and the distributed power supply; It belongs to a weak power supply system. During the island operation period, its voltage and frequency may change, and it is difficult to meet the synchronization conditions, resulting in reclosing failure, which will seriously affect the power supply reliability of the power grid.

The main problem brought about by this processing method is that during the fault period of the distribution network, a large number of distributed power sources will be unnecessarily out of operation, reducing the utilization efficiency of distributed power sources, and thus may cause insufficient load power supply, resulting in power outages The scope is further expanded; in order to avoid the asynchronous closing problem caused by the access of distributed power sources, it is proposed to install power direction components on the incoming line side of the system power supply to distinguish faulty feeders and selectively cut off the DG unit connected to the faulty feeder. (See Zhao Yueling, Li Huazhong, Sun Ming. The impact of distributed power access on substation distance protection and reclosing [J]. Power System Protection and Control, 2010, 38(20): 217-224), etc., this research mainly It is a method to discuss how to effectively remove all DGs on the feeder before the automatic reclosing action. There are still disadvantages such as low utilization efficiency of distributed power supply, which may cause insufficient power supply and expand the scope of power outages.

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