A Fault Self-healing Method for Non-Effectively Grounded Neutral Point System
A non-effective grounding and system fault technology, applied in the field of power system, can solve the problem that the fault processing technology of distribution line cannot meet the requirements of high power supply reliability of intelligent distribution network, etc.
Active Publication Date: 2016-06-29
TSINGHUA UNIV +2
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Problems solved by technology
[0006] To sum up, the existing distribution line fault handling technology cannot meet the requirements of high power supply reliability of smart distribution network.
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[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0014] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the present invention is not limited to the specific embodiments disclosed below limit.
[0015] figure 1 The flow of the fault self-healing method is shown.
[0016] Closed-loop structure of distribution lines, open-loop segmented operation. Each section is equipped with a switch that can cut off the short-circuit current.
[0017] Step 1, fault detection. Real-time detection of voltage and current on the distribution line to determine whether there is a fault on the distribution line; if any phase current is greater than the set value, or any phase voltage is lower than the set value, it is determined th...
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The invention discloses a fault self-healing method for a neutral point non-effective earthing system, wherein the fault self-healing method is used for quickly isolating a fault of a distribution line and quickly restoring power supply of a non-fault zone. The method comprises the following steps: step one, performing fault detection, and judging whether the distribution line is in fault; step two, performing fault isolation, and judging whether the fault is single-phase earthing; and step three, performing fault isolation, if the fault is not single-phase earthing, protecting quick-acting based on a condition that three-phase current is increased or three-phase voltage is reduced, and choicelessly isolating the distribution line; and if the fault is single-phase earthing, identifying the faulty line based on information obtained by a zero sequence current mutual inductor of all lines on the same bus, and choicelessly isolating the distribution line; and step four, performing power supply restoration, and restoring loaded power supply in electricity shutdown in the non-fault zone. According to the fault self-healing method, fault self-healing of the neutral point non-effective earthing system can be effectively realized. During the fault self-healing process, the fault zone is quickly isolated, and the electricity shutdown of the non-fault zone is quickly restored.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a power distribution line fault processing technology. Background technique [0002] Distribution lines (also known as feeder lines, feeder lines) are an important part of the power distribution system. After a fault occurs in the distribution line, automatic detection and removal of the faulty section is a prerequisite for ensuring the reliability of power supply for users. [0003] Fault self-healing means that no or only a small amount of human intervention is required to isolate problematic components in the power network or restore them to normal operation, minimizing or avoiding power supply interruptions for users. Fault self-healing includes fault diagnosis, fault isolation and fault recovery. [0004] In the 1980s, developed countries appeared distribution line automation systems marked by intelligent switching devices such as sectionalizers and reclosers. The search and i...
Claims
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IPC IPC(8): H02H7/26
Inventor 施慎行董新洲沈冬吴家华
Owner TSINGHUA UNIV