Optimality in the Sense of Arm Current Distribution of MMC VSC-HVDC

Briff, Pablo

doi:10.1109/tpel.2018.2876222

Cited by 6 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using (2), (4), and the SMC voltage, the updated expression for arm voltage is obtained. The segregation of different frequency components provides respective components of arm voltage (7). Here, v udc and v uk are the dc and kt th order harmonic components of the arm voltages.…”

Section: Arm Voltagementioning

confidence: 99%

“…The modular multilevel converter (MMC) is the latest and most advanced version of the VSC [4–6] technology. In terms of arm‐current distribution, MMC is the most optimal linear time‐invariant converter [7] system. Recent advances in HVDC breaker [8] have provided additional momentum to the widespread adoption of MMC‐based HVDC systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Suppression of third‐order harmonic current in transformerless MMC

Yadav

Singh

Das

2022

Energy Conversion and Econom

View full text Add to dashboard Cite

The modular multilevel converter (MMC) based high voltage DC (HVDC) system can be effectively used for bulk power transmission. The MMC topology for the voltage source converter (VSC) has several advantages. In this work, the transformerless operation of MMC is explored. The internal dynamic of MMC can induce a third‐order zero‐sequence harmonic current. Its effect on the system is analysed, including the adverse impacts on energy requirement per arm and power transfer capability. The internal dynamic equations of the transformerless MMC configuration are derived, and two different controllers: the proportional‐resonant (PR) controller and proportional‐integral (PI) controller, were applied to suppress the unwanted third‐order current. The performance analysis of these controllers is presented and the results indicate that the controllers efficiently suppress the third‐order harmonic current. Moreover, the electromagnetic transient (EMT) models of MMC under different configurations have been developed on the real‐time digital simulator (RTDS) platform. An analysis of internal variables of the MMC is also included to ensure that the controller does not adversely affect the system. Lastly, the state‐space model is developed, and the stability is analysed.

show abstract

Section: Arm Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suppression of third‐order harmonic current in transformerless MMC

Yadav

Singh

Das

2022

Energy Conversion and Econom

View full text Add to dashboard Cite

show abstract

“…Modular multilevel converters (MMCs) are currently the most advanced voltage source converter topologies. As proven in [1], the MMC is the most optimal linear time‐invariant converter in terms of arm current distribution. Any topology that outperforms it would be either a non‐linear or time‐varying system.…”

Section: Introductionmentioning

confidence: 99%

Design of internal dynamics based MMC controller for HVDC transmission

Yadav

Singh

Das

2020

Energy Conversion and Economics

View full text Add to dashboard Cite

Currently, the modular multilevel converter (MMC) is the most advanced voltage source converter topology. Because the MMC is a converter topology, the most common approach for controller design is considering the conventional converter model to design the controller accordingly. Though this approach ignores the internal dynamics of the MMC, the modular structure enables distribution of the capacitors in six arms of the MMC. However, this distribution leads to a complex internal dynamic that affects the controller operation and cannot be disregarded. In this study, a detailed fundamental and circulating current model of the MMC is developed while considering its internal dynamics. The detailed modelling reveals cross-and inter-couplings. On the basis of the detailed model and analysis of the couplings, three controllers have been proposed. Moreover, the performances of the proposed and conventional controllers have been analysed and compared under steady-state and active and reactive power changes. The proposed controllers are observed to achieve improved decoupling compared to that achieved by the conventional controller.

show abstract