A coordinated control method and system for a hybrid cascaded direct current transmission system
A DC transmission system and hybrid cascading technology, applied in the direction of power transmission AC network, etc., can solve problems that threaten the stable operation of DC, and achieve the effect of preventing long-term loss of control and protecting equipment safety
Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +1
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Problems solved by technology
[0004] The purpose of the present invention is to provide a coordinated control method and system for a hybrid cascaded DC power transmission system, which can effectively deal with the problems caused by the exit of the current source converter in the hybrid DC converter on the inverter side in the hybrid cascaded DC power transmission system. Over-modulation of the voltage source converter and saturation of the current regulator on the rectification side prevent the DC controller from running out of control for a long time, threatening the safe and stable operation of the DC, and better protect the safety of the equipment
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[0043] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples are not intended to limit the present invention. Therein, the same reference numerals are used for the same components.
[0044] attached figure 1 Shown is a flow chart of a specific embodiment of the coordinated control method for a hybrid cascaded DC power transmission system of the present invention, which is applied to such as figure 2 The hybrid cascaded DC transmission system shown, the hybrid cascaded DC transmission system includes a rectifier converter station and an inverter converter station, and the rectifier converter station and the inverter converter station are connected by a DC transmission line, and the inverter converter station The flow station includes at least one set of hybrid...
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The invention discloses a coordinated control method for a hybrid cascaded direct current transmission system. The control method includes: when detecting that a current source converter in a hybrid direct current converter of an inverter converter station is out of operation, the rectifier converter station Immediately control the DC transmission power to follow the corrected DC power reference value P REF , the inverter converter station immediately controls the DC voltage to follow the corrected DC voltage reference value U dmREF . The invention also discloses a corresponding coordinated control system. The invention can effectively deal with the problems of overmodulation of the voltage source converter and saturation of the current regulator on the rectifier side caused by the withdrawal of the current source converter in the hybrid DC converter on the inverter side in the hybrid cascaded direct current transmission system. Prevent the DC controller from running out of control for a long time, threatening the safe and stable operation of the DC, and better protect the safety of the equipment.
Description
technical field [0001] The invention belongs to the field of direct current power transmission, and particularly relates to a coordinated control method and system for a hybrid cascade direct current power transmission system. Background technique [0002] In recent years, integrated LCC-HVDC has low cost, low loss, mature operation technology, and VSC-HVDC can realize active power and reactive power decoupling control, can supply power to passive network, compact structure, small footprint, no inverter The hybrid DC transmission technology with side commutation failure has been developed rapidly and has good engineering application prospects. By using LCC-HVDC on the rectifier side and VSC-HVDC on the inverter side, the commutation failure on the inverter side can be reduced or avoided. At the same time, to a certain extent, the advantages of the project cost are guaranteed. [0003] In order to meet the requirements of long-distance and large-capacity power transmission, ...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 赵文强常昊添侍乔明王冰倩唐俊王永平卢宇田杰李海英
Owner NR ELECTRIC CO LTD