Load equipartition method and apparatus of backup automatic switching apparatus
A technology of load sharing and automatic switching, which can be applied to AC networks with different sources of the same frequency, etc., and can solve the problems of reduced power supply reliability and load loss of the power grid.
Active Publication Date: 2017-05-10
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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Problems solved by technology
However, the problem with this method is that the standby self-injection device configured on the second section switch 6DL first disconnects the third switch device 3DL and then closes the second section switch 6DL, which will cause the second section switch 6DL connected to the third section switch 3DL. The three-bus 3M loses voltage for a short time. If the load carried by the third bus 3M is equipped with a low-voltage tripping device, it may cause load loss and reduce the reliability of the grid power supply.
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[0025] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "or / and" includes any and all combinations of one or more of ...
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The invention provides a load equipartition method and apparatus of a backup automatic switching apparatus. The method comprises the following steps: acquiring electrical information of a circuit which the backup automatic switching apparatus itself belongs to; determining whether load equipartition motion signals sent by another backup automatic switching apparatus are received; if so, when it is determined that buses at the two sides of a section switch satisfy same-period closing conditions according to the electrical information, sending a switch switching-on instruction for switching on the section switch; and after the section switch is switched on, sending a switch switching-off instruction for tripping off a first branch switch which is at an intermediate main transformer low-voltage side and is connected with the section switch. The method and apparatus can avoid bus short-time under-voltage, reduce load loss and improve the power supply reliability of a power grid.
Description
technical field [0001] The invention relates to the technical field of electric power systems and automation thereof, in particular to a load sharing method and device for a standby automatic switching device. Background technique [0002] Generally speaking, if figure 1 As shown, a 220kV or 110kV step-down substation with three main transformers is configured. The lower side of the middle main transformer is configured with double switches, and each supplies a section of busbar, specifically the second busbar 2M and the third busbar 3M. In the normal operation mode, the first switch device 1DL (the side main transformer is the switch device connected to the low-voltage side of #1 main transformer), the second switch device 2DL (the middle main transformer is the two connected to the low-voltage side of the 2# main transformer) one of the two switching devices), the third switching device 3DL (the other of the two switching devices connected to the lower side of the main tr...
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Inventor 陈兴华杨文佳陈锦昌陈睿魏宏李力吴国炳李新超郑丹袁泉
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD