Topology structure and start-up method of hybrid direct current transmission system based on polarity switching
A hybrid DC and power transmission system technology, applied in electrical components, power transmission AC networks, output power conversion devices, etc. The effect of prolonging the service life
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[0019] Such as figure 1 is the topology diagram of the entire hybrid DC transmission start-up system, where 1 is the two-terminal AC system, 2.1 is the first AC circuit breaker, 2.2 is the second AC circuit breaker, 3.1 is the first converter transformer, and 3.2 is the second converter transformer, 3.3 is the third converter transformer, 4 is the AC filter, 4.5 is the converter reactor, 5 is the VSC converter, 6 is the LCC converter, 7 is the voltage stabilizing capacitor, 8 is the polarity switching DC circuit breaker, 9 is a DC filter, and 10 is a smoothing reactance.
[0020] figure 2 , 3 They are the basic control block diagrams of the VSC converter on the rectification side and the LCC converter on the inverter side, respectively. Among them, the VSC converter adopts the d-q decoupling direct current control method, the active power control is constant active power control, the reactive power control is constant reactive power control, and the LCC converter adopts tw...
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