Quick tidal current reversal control method of hybrid direct current transmission
A technology of hybrid direct current transmission and power flow reversal, which is applied in the field of power transmission and distribution, and can solve problems such as the inability of the control system to play a role
Inactive Publication Date: 2014-10-15
CHINA SOUTH POWER GRID ELECTRIC POWER RES INST +1
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The present invention studies the rapid power flow reversal of a hybrid direct current transmission system in which the rectifier side is a grid commutation converter and the inverter side is a modular multilevel converter using a full-bridge sub-module topology. By turning off the mechanical switch, the power flow reversal of the hybrid DC transmission can be quickly controlled through the control strategy, and the situation that the control system cannot function when the DC voltage drops to close to 0 is avoided
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[0016] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0017] In the fast power flow inversion control method of the hybrid direct current transmission of the present invention, the rectification side of the hybrid direct current transmission is composed of a grid commutation converter, and the inverter side is composed of a modular multilevel converter, such as figure 1 As shown; the modular multilevel converter structure of the inverter test adopts the full-bridge sub-module topology, which has the ability to output positive and negative capacitor voltages, such as figure 2 shown. It is characterized in that the grid commutation converter on the rectification side adopts a 12-pulse converter, and the modular multilevel converter on the inverter side adopts a full-bridg...
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The invention discloses a quick tidal current reversal control method of hybrid direct current transmission in the field of transmission and distribution. A rectification side of the hybrid direct current transmission consists of a grid phase change converter; an inversion side of the hybrid direct current transmission consists of a modular multi-level converter; the modular multi-level converter on the inversion side adopts a full-bridge submodule topology; the grid phase change converter on the rectification side adopts 12 pulse converters; the modular multi-level converter on the inversion side is in a full-bridge submodule topology structure; the rectification side adopts constant direct current control; the inversion side adopts constant direct current voltage control; and after a hybrid direct current transmission system receives a tidal current reversal signal, the modular multi-level converter on the inversion side reduces direct current voltage at a set rate by the constant direct current voltage control, and then instantly adjusts the direct current voltage of the modular multi-level converter adopting the full-bridge submodule topology into a "negative pole" mode from a "positive pole" mode. The method can quickly control tidal current reversal of the hybrid direct current transmission by the control strategy, without on-off of a mechanical switch.
Description
technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a fast power flow reversal control method for hybrid DC power transmission. Background technique [0002] The large transmission capacity and high voltage level of traditional DC transmission projects have been widely recognized, and the highest transmission capacity and highest voltage level of flexible DC transmission projects under construction have reached 2×1000MW and 500kV respectively, although the capacity and voltage level of the two There is still a certain gap, but considering the development status and prospects of flexible DC power transmission, hybrid DC power transmission combining traditional DC power transmission and flexible DC power transmission will have engineering application prospects. The invention relates to a hybrid DC power transmission in which the rectification side is a grid commutation converter and the invert...
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Login to View More IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 李凌飞黄莹黎小林赵成勇徐洁俞露杰郭春义
Owner CHINA SOUTH POWER GRID ELECTRIC POWER RES INST