Research on capacitance voltage balance of modular multilevel converter based on improved quick sorting method

Qiu, Jun; Dai, Taozhen; Cui, Yanwei; Xin, Shuangzhi; Lu, Yanchun

doi:10.1109/cac.2017.8243782

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…In References [22][23][24][25][26], if the SM capacitor voltage deviation is within the acceptable range of the system, the SM switching frequency is reduced by different methods. In References [22,23], the SM operating state is determined according to the direction of the bridge arm current and change trend of the reference voltage.…”

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confidence: 99%

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Research on an Auto-Optimized Capacitor Voltage Balancing Control Strategy of MMC SM for Renewable Energy HVDC Transmission System

et al. 2019

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The Modular Multilevel Converter (MMC) is one of the most attractive converter topologies in the High Voltage Direct Current (HVDC) transmission field. The latest widely used sorting method has a low algorithm complexity. It can effectively balance the sub-module (SM) capacitor voltages, but it would cause relatively high switching frequency and power loss. Aiming at the problem that the sub-module (SM) capacitor voltage sorting algorithm has a large switching loss due to the high switching frequency of the device, this paper proposes an auto-optimized capacitor voltage balancing control strategy. Firstly, the topology and operation principle of MMC are analyzed. Secondly, a SM capacitor voltage control method based on the dynamic deviation threshold is proposed. Considering the switch switching state of the SM and the difference between the voltages of each SM, the algorithm can obtain the dynamic deviation valve using the closed-loop control. The method can avoid the unnecessary repeated switching of the Insulated Gate Bipolar Transistor (IGBT) under the premise of ensuring that the capacitance voltages of the SMs are basically the same, which effectively result in reducing the switching frequency of the MMC SM and reducing the switching loss, thereby improving the operating efficiency of the system. Finally aiming at the proposed control strategy, the simulation and experimental verification are carried out which shows that the proposed algorithm can better control the system voltage deviation, reduce the switching loss of the system and improve the stability of the system.

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confidence: 99%

“…However, a fixed module rotation number can only be obtained by multiple simulation tests. Reference [25] proposed a coefficient of variation (CV) algorithm, which can reduce the switching frequency by setting CV, but the value of CV is not easy to choose. Hofmann, V., et.al.…”

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confidence: 99%