A multi-terminal hybrid direct current transmission system topology and control method for supplying power to multi-drop passive networks
A passive network and power transmission system technology, applied in the field of electric power engineering, can solve problems such as unseen research, and achieve the effects of convenient expansion, perfect and clear control strategy, and smooth and stable start-up process
Inactive Publication Date: 2018-10-26
HUBEI UNIV OF TECH
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Problems solved by technology
[0005] How to smoothly start the multi-terminal LCC-VSC hybrid DC transmission system has not been studied in the literature at home and abroad
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[0024] figure 1 Topology diagram of the multi-terminal LCC-VSC hybrid DC transmission system for the entire multi-drop passive network. In the figure, AC system 1, AC filter 2, converter transformer 3, LCC converter 4, smoothing reactor 5. The VSC1 converter 6, the VSC1 side is connected to the transformer and the equivalent resistance 7 of the phase reactor, and the VSC side is connected to the transformer and the equivalent inductance 8 of the phase reactor. The equivalent resistance and equivalent reactance of the passive network 1 are 9 and 10 respectively, the VSCn converter 6n, the equivalent resistance 11 of the VSCn side connected to the transformer and phase reactor, and the equivalent inductance 12 of the VSCn side connected to the transformer and phase reactor . The equivalent resistance and equivalent reactance of the passive network n are 13 and 14 respectively;
[0025] Among them, the active power flow flows from the LCC converter 4 to the VSC converters 6 and...
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The invention relates to a multi-port hybrid DC power transmission system topology for power supply to a multi-droppoint passive network and a control method of the multi-port hybrid DC power transmission system topology. According to the method, line commuted converter-voltage source converter (LCC-VSC1) hybrid DC power transmission systems at two ends are firstly and stably started; when a newly-added VSC<n> convertor station and a connected passive network n are accessed, a DC power supply is introduced from a DC side to charge a voltage stabilization capacitor of the newly-added VSC<n> converter station through an AC switch and a current limiting resistor; an auxiliary power supply is not needed to be additionally arranged; and since the switch acts on a connection loop and does not act on a disconnection circuit, the charging current is limited within 1kA by the current limiting resistor, thus, the AC switch can be used, and a DC switch is unnecessarily used. The whole starting process is smooth and stable when the multi-port LCC-VSC hybrid DC power transmission system for power supply to the multi-droppoint passive network is in transition to a normal running state from a complete stopped state, meanwhile, the control strategy of the hybrid DC system is complete and clear, and the system can accurately track a target reference value to stably run after completion of starting.
Description
technical field [0001] The invention belongs to the technical field of electric power engineering. It specifically relates to a multi-terminal hybrid direct current transmission system topology and start-up method for supplying power to a multi-drop passive network (a current source converter LCC based on multiple thyristors and a voltage source converter based on multiple fully-controlled power electronic devices) Multi-terminal hybrid high-voltage direct current transmission technology Hybrid HVDC of inverter VSC). Background technique [0002] The multi-terminal hybrid DC transmission system has a variety of topologies according to different application scenarios. When it is used to supply power to multi-drop passive networks, the following topology can be used: a line commutated converter (LCC) is used on the rectifier side ) as the centralized power transmission end, the inverter side adopts multiple voltage source converters VSC (voltage source converter) to connect m...
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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 余瑜
Owner HUBEI UNIV OF TECH