Fault protection method and device with energy-storing power distribution system
A power distribution system and fault protection technology, applied in emergency protection circuit devices, fault locations, measuring devices, etc., can solve problems such as difficulty in coordination and setting, inability to adapt to distributed energy penetration rates, etc.
Inactive Publication Date: 2017-12-12
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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[0005] The present invention provides a fault protection method and device for a power distribution system with energy storage, which is used to solve the problem of using improved current protection to protect a power distribution system with multiple microgrids with energy storage elements in the prior art. Relay protection has led to difficulties in coordination and setting, and technical problems that cannot adapt to power distribution systems with high penetration rates of distributed energy
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[0048] The embodiment of the present invention provides a fault protection method and device for a power distribution system with energy storage, which is used to solve the problem in the prior art that the improved current protection is often used for power distribution of a microgrid with multiple energy storage elements. The relay protection of the system has led to the difficulty of coordination and setting, and the technical problems of being unable to adapt to the power distribution system with a high penetration rate of distributed energy.
[0049] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention....
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The invention discloses a fault protection method and device with an energy-storing power distribution system. The method comprises the following steps: acquiring a power direction and judging and excluding a fault position by virtue of the power direction; firstly, detecting if the power distribution system is in fault, then finding the fault from a transformer, busbar and feeder in layers and lastly confirming a fault section; performing relaying action for isolating the fault. The fault protection method is adopted for solving the technical problems of the prior art that the improved current protection is frequently adopted for performing relaying protection on a micro-grid power distribution system containing multiple energy-storing elements so that the matching and settling become difficult and the method cannot adapt to a power distribution system with high distributed energy permeability.
Description
technical field [0001] The invention relates to the field of relay protection, in particular to a fault protection method and device for a power distribution system including energy storage. Background technique [0002] The connection of energy storage and distributed power to the distribution network can improve the flexibility and reliability of the distribution network. In order to avoid its impact on the main network, the form of micro-grid is often used to accommodate energy storage components and distributed power units. When there is After the microgrid of energy storage elements and distributed power units is connected to the distribution network, it will not only change the short-circuit current of the nodes and lines, but also change the duration of the fault and its direction of flow. A single small-capacity energy storage element and distribution The micro-grid connection of the type power supply unit may have little impact on the protection of the power distrib...
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IPC IPC(8): H02H7/22H02H7/04H02H7/26G01R19/165G01R31/08
CPCH02H7/22G01R19/16571G01R19/16576G01R31/086H02H7/04H02H7/26
Inventor 徐琪曾杰张弛陈小军赵伟谢宁张威梅成林刘仲尧孙英英靳力姜贵询
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID