A Protection Method of Distribution Network Containing dg Based on Multipoint State Quantity Information
A state quantity, distribution network technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of expanding the scope of power outages, unable to achieve accurate fault location, and increasing the difficulty of implementation, achieving low requirements for information synchronization, Ease of implementation, low-traffic effect
Active Publication Date: 2018-04-03
TIANJIN UNIV
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Problems solved by technology
However, in this scheme, for different types of DG or different DG equivalent impedances of the same type of DG, the setting impedance value in the head-end protection is also different, and the system equivalent impedance and DG equivalent value need to be estimated resistance, increasing the implementation difficulty
In addition, when a fault occurs in the upstream area of the DG and the fault location cannot be judged only by the overcurrent protection action information, this scheme first sends a trip command to the protection in the middle of the area, decomposes the fault area into two radial lines, and then passes Overcurrent protection action information realizes fault location, this design cannot realize accurate fault location, and may expand the scope of power outages
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[0025] The technical solution of the invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.
[0026] The logic flow chart of fault location and protection action logic of distribution network containing DG based on multi-point state quantity information in the present invention is as follows figure 1 shown. For more generality, in such as figure 2 In the distribution network containing DG shown, two DGs are connected to feeder 1, and one DG is connected to feeder 2. Circuit breakers, protection 9, protection 10 and protection 11 are arranged at the end of line CD, line DE and line AG in the upstream area of DG near DG, so that the fault can be cut off from both ends of the line. Before introducing the basic principles of fault location, overcurrent protection setting values or setting impedance values need to be set for protection at different locations.
[0027] Let Z set_X and Z dir_X are t...
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The invention relates to a DG-contained power distribution network protection method based on multi-point state quantity information. The method comprises the steps that: an information processing center is set in a transformer substation of a DG-contained power distribution network, and overcurrent protection is configured to each kind of protection; compensation impedance is constructed, and the maximum sensitive angle of the compensation impedance is set to be a line impedance angle; when current III segment protection of one or some kinds of protection in the DG-contained power distribution network acts, the protection actively uploads the information; if the protection is DG upstream first end protection, the protection simultaneously uploads the polarity information of the compensation impedance; as long as the short circuit current flowing through the protection exceeds a current III segment set value, the action information is uploaded every a certain time interval; and after an information processing center receives state quantity information sent by different kinds of protection, the information processing center firstly judges the positions of the protection and then takes different action logics according to the different conditions. According to the invention, the fault on any position of a feeder line can be rapidly, reliably and precisely positioned and removed.
Description
Technical field [0001] The invention belongs to the field of power system distribution network protection and control, and proposes a DG-containing distribution network protection scheme based on multi-point state quantity information. Background technique [0002] Distributed generation (DG) is a new type of electric energy, including photovoltaic power generation system, wind power generation system, micro gas turbine power generation system, small hydropower and so on. Distributed power generation technology has a series of advantages such as environmental protection and economy, and can well meet people's requirements for power safety, stability and economic environmental protection. It has attracted widespread attention and has been gradually promoted and developed. [0003] The traditional medium and low voltage distribution network is usually equipped with three-stage current protection, which does not consider the connection of DG in the network. However, the access...
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IPC IPC(8): H02H7/26H02H7/28
CPCH02H7/262H02H7/28
Inventor 陈晓龙李永丽
Owner TIANJIN UNIV