Hybrid cascaded direct-current power transmission system coordination control method and 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: 2020-08-28
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 given are not intended to limit the present invention. Wherein, the same components use the same reference numerals.
[0044] attached figure 1 Shown is a flow chart of a specific embodiment of the hybrid cascaded direct current transmission system coordination control method of the present invention, which is applied to such as figure 2 The hybrid cascaded direct current transmission system shown, the hybrid cascaded direct current transmission system includes a rectifier converter station and an inverter converter station, and the rectifier converter station and the inverter converter station are connected through a direct current transmission line. The flow station includes at least one set of hy...
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The invention discloses a coordination control method for a hybrid cascaded direct-current power transmission system. The control method comprises the following steps that when it is detected that a current source type converter in a hybrid direct current converter of an inversion converter station quits operation, a rectification converter station immediately controls a direct current transmission power to follow a corrected direct current power reference value PREF, and the inversion converter station immediately controls a direct current voltage to follow a corrected direct current voltagereference value UdmREF. The invention also discloses a corresponding coordination control system. According to the invention, the problems of overmodulation of the voltage source type converter and the saturation of the rectification side current regulator due to quitting of the current source type converter in the inverter side hybrid direct current converter in the hybrid cascaded direct currenttransmission system can be effectively solved, the condition that the safe and stable operation of direct current is threatened due to out of control of the direct current controller for a long timecan be prevented, and equipment safety is well protected.
Description
technical field [0001] The invention belongs to the field of direct current transmission, and in particular relates to a coordinated control method and system for a hybrid cascaded direct current 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, and no inverter The hybrid DC transmission technology for the problem of commutation failure on the rectifier side has achieved rapid development 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. problems, and at the same time guarantee the advantages of project cost to a certain extent. [0003] In order to meet the requirements of long-distance and larg...
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Login to View More 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