Power tracking in a MMC-multi-terminal HVDC system with centralized and decentralized MPC using a black box modeling approach

Nowak, Timo; Suriyah, Michael

doi:10.1109/upec.2017.8232017

Cited by 2 publications

(1 citation statement)

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“…As FACTS or STATCOM, they exploit the existing line capacities and provide reactive power to support the grid [7], [8]. Due to the DC fault handling capability of the MMC and additional DC breakers, extensive DC networks can be established [9], [10]. The topology is also considered promising as galvanically isolated grid inverters [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Energy Pulsation Reduction in Modular Multilevel Converters Using Optimized Current Trajectories

Braeckle

Himmelmann

Gröll

et al. 2021

IEEE Open J. Power Electron.

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In power electronics, the modular multilevel converter (MMC) is an easily scalable topology with an high output voltage quality. It is suitable for the transmission of large amounts of electrical power over long distances, which supports the realization of the ongoing energy transition. State-of-the-art methods require a comparatively large total cell capacitance in the system for energy pulsations during operation. In the present paper, in order to minimize this total capacitance, first a new method is developed to model the system, and second, by help of this model, optimal current trajectories are calculated. These currents are used for control to reduce the energy pulsation over the complete operating range, and thus, to better utilize the hardware. The new method independent on the Clarke transformations is implemented on a laboratory scale setup, and measurement results are presented which validate the new method. Furthermore, the new method is compared to the state-of-the-art method of the compensation of the 2nd harmonic and outperforms the latter significantly. This applies to the entire operating range for different power factors. A total reduction of up to 44% of the energy pulsations is achieved.

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