Electromechanical transient modeling method for distributed access type LCC-MMC hybrid direct current system
A transient modeling and hybrid DC technology, which is applied to AC network circuits, circuit devices, power transmission AC networks, etc., can solve the problems that the electromechanical transient modeling of UHV decentralized access hybrid DC systems has not been perfected, and achieves The effect of improving simulation speed and calculation efficiency and meeting calculation accuracy requirements
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[0045] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0046] In the hybrid DC system, considering the economy, the rectifier side uses the LCC converter station, while the inverter side uses the MMC to eliminate the commutation failure problem, figure 1 The unipolar topology of the distributed access LCC-MMC hybrid DC system is given, in which the LCC rectifier station is composed of two twelve-pulse LCC converters connected in series, which are centrally connected to the power grid at the sending end, and the MMC inverter station is composed of high-voltage It is obtained in series with two low-voltage MMC groups, and each MMC group is obtained by connecting several MMCs in parallel. Different MMCs can be connected to different AC buses to achieve the purpose of decentralized access.
[0047] The topology a...
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