Multi-port hybrid DC power transmission system topology for power supply to multi-droppoint passive network and control method of multi-port hybrid DC power transmission system topology
A technology of passive network and power transmission system, applied in the direction of AC network circuit, power transmission AC network, electrical components, etc., can solve problems such as unseen research, and achieve the effect of convenient expansion, smooth and stable start-up process, and perfect and clear control strategy
Inactive Publication Date: 2016-03-23
HUBEI UNIV OF TECH
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[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 DC 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 HybridHVDC of converter VSC). Background technique [0002] The multi-terminal hybrid DC transmission system has a variety of different topologies according to different application scenarios. When it is used to supply power to multi-drop passive networks, the following topology can be used: the rectifier side uses a line commutated converter (LCC) As the centralized power transmission end, multiple voltage source converters VSC (voltage source converter) are used on the inverter side to connect multipl...
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IPC IPC(8): H02J3/36
CPCY02E60/60H02J3/36H02J2003/365
Inventor 余瑜
Owner HUBEI UNIV OF TECH