Method and device for judging operating state of converter station for multi-terminal flexible direct current transmission system
A DC transmission system, multi-terminal flexible technology, applied in emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve the problems of single-ended converter station troubleshooting, tripping and other problems, and achieve optimal safe operation and reliable collection. Effect
Inactive Publication Date: 2018-12-21
NR ELECTRIC CO LTD +1
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[0005] The purpose of the present invention is to address the deficiencies in the prior art, to provide a method and device for judging the operating status of a converter station in a multi-terminal flexible direct current transmission system, and to solve the problem of troubleshooting and maintenance of a single-terminal converter station in a multi-terminal flexible direct current transmission system. The problem of system tripping and the problem of flexible and safe operation of multi-terminal flexible direct current transmission system
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[0028] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0029] The invention discloses a method for judging the operating status of a converter station by a multi-terminal flexible direct current transmission system. Firstly, the pole connection or pole isolation state of each converter station is detected; when the inter-station communication is intact, the multi-terminal flexible direct current transmission system detects in real time The pole connection or pole isolation status of each converter station; in the case of abnormal inter-station communication, the multi-terminal flexible direct current transmission system locks the pole connection or pole isolation status of the converter station in the previous detection period of the inter-station communication abnormality, and judges it as an inter-station The pole connection or pole isolation state of the converter sta...
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The invention discloses a method for judging the operation state of a converter station by a multi-terminal flexible HVDC transmission system. Firstly, the method detects the pole connection or pole isolation state of each converter station. In the case of good communication between stations, the multi-terminal flexible direct current transmission system detects the pole connection or pole isolation state of each converter station in real time. In the case of abnormal communication between stations, the multi-terminal flexible HVDC system locks the pole connection or pole isolation state of the converter station in the previous detection period of abnormal communication between stations, and judges it as the pole connection or pole isolation state of the converter station after the abnormal communication between stations. If the converter station is in a pole-connected state, the system determines that the converter station is connected with a DC system and is in a networking state; Ifthe converter station is in a polar isolation state, the system determines that the converter station is separated from the DC system and in the off-grid state. The invention also correspondingly discloses a device for judging the operation state of a converter station by a multi-terminal flexible HVDC transmission system.
Description
technical field [0001] The invention relates to the technical field of flexible direct current transmission in electric power systems, in particular to a method and a device for judging the operating state of a converter station in a multi-terminal flexible direct current transmission system. Background technique [0002] The flexible DC transmission system uses a voltage source converter, which can independently and quickly control the active power and reactive power of the system, thereby improving the stability of the system, suppressing the fluctuation of system frequency and voltage, and improving the steady-state performance of the AC system. [0003] With the development of flexible DC transmission technology, multi-terminal flexible DC transmission and DC power grids have gradually been popularized and applied. In December 2013, Guangdong Nanao three-terminal flexible direct current was put into operation; in July 2014, Zhejiang Zhoushan five-terminal flexible direct...
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IPC IPC(8): H02J3/36H02H7/26
CPCH02H7/268H02J3/36Y02E60/60
Inventor 王柯卢宇董云龙胡兆庆李钢丁久东汪楠楠随顺科
Owner NR ELECTRIC CO LTD