Mitigating DC-side power oscillations and negative sequence load currents in Modular Multilevel Converters under unbalanced faults- first approach using resonant PI

Bergna-Diaz, Gilbert; Suul, J.-A.; Berne, E.; Egrot, Philippe; Lefranc, Pierre; Vannier, Jean-Claude; Molinas, Marta

doi:10.1109/iecon.2012.6388769

Cited by 24 publications

(13 citation statements)

References 11 publications

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“…17, under unbalance operation in [56]. With this controller the MMC acts as a ''power oscillation firewall'' as it absorbs the power fluctuations coming from the AC side and caused by the unbalance operation, yielding a constant power output at the DC terminals in spite of the unbalance.…”

Section: Modular Multilevel Convertermentioning

confidence: 99%

“…Nonetheless, the MMC achieves such operation by means of the differential current, leaving the load current free to attend a different task; e.g., balancing the currents at the AC side during the unbalance voltage operation. This was presented in [52,56] using a coordinate transform; while in [57], it was achieved with natural phase ''abc'' coordinates, allowing full independent control of the averaged phase variables of the converter.…”

Section: Modular Multilevel Convertermentioning

confidence: 99%

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HVDC Transmission for Offshore Wind Farms

Olguin

Garcés

Bergna-Diaz

2014

Large Scale Renewable Power Generation

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Large-scale wind energy expansion is limited by factors such as the land use and the visual impact of facilities on land. Offshore wind energy can overcome the above-mentioned limitations. In addition, wind velocity is higher and more constant offshore than onshore. This chapter will present an overview of different topologies for grid integration of offshore wind farms. Special emphasis is made on the offshore grid topologies and types of power electronic converters.

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Section: Modular Multilevel Convertermentioning

confidence: 99%

Section: Modular Multilevel Convertermentioning

confidence: 99%

HVDC Transmission for Offshore Wind Farms

Olguin

Garcés

Bergna-Diaz

2014

Large Scale Renewable Power Generation

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“…From (12) it is also clear that there is no unbalance between the two branches of a phase leg due to a negative sequence voltage existence in steady state. For a u cm with a third harmonic frequency, the associated term ∆p k cm is also oscillating and given by (14). The latter is also of common-mode nature.…”

Section: Operation Of MMC Under Grid Unbalancesmentioning

confidence: 99%

“…In [13], a zero sequence current controller was added to account for faults on the converter side. Other works have been focusing on the MMC control for DC-link oscillation cancellation due to symmetric current injection during grid unbalances [14][15][16][17]. Latest research has been also conducted on the analysis of the modified submodule capacitor voltage ripple expressions as a result of the grid asymmetry [18][19][20][21][22], mainly as the means to develop appropriate advanced control systems.…”

Section: Introductionmentioning

confidence: 99%

Impact of Grid Asymmetries on the Operation and Capacitive Energy Storage Design of Modular Multilevel Converters

Vasiladiotis

Cherix

Rufer

2015

IEEE Trans. Ind. Electron.

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The grid-connected Modular Multilevel Converter (MMC) is very likely to operate under asymmetric grid conditions. Such a converter features several unique characteristics, which make its analysis different from other types of power converters in similar cases. In this paper, the three well-established control techniques, i.e., balanced current and negative sequence current injection for active/reactive power oscillation elimination, are tailored for the MMC case taking into account grid current limitation under fault conditions. Since the focus is laid on the MMC design impact during grid asymmetries, the three methods are compared in terms of branch energy variation increase as well as maximum achievable active power transfer. Moreover, the effect of circulating current second-order harmonic injection for capacitive storage reduction as well as DC-link oscillation elimination is also studied. Finally, experimental results from a down-scaled laboratory prototype verify the theoretical studies.

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“…This paper investigates around an original idea based on the use of resonant controller. The idea of resonant controller has already been used for long time on the control of Voltage Source Converter [11], [12], [13]. More recently some authors have applied this strategy to the control of MMC.…”

Section: Introductionmentioning

confidence: 99%

Control and performance of modular multilevel converters currents using resonant controller

Belhaouane

Saad

Guillaud

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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Recently, Modular Multilevel Converters (MMCs)have received an increasing attention since this topology of converters is a viable solution for high-voltage and high-power applications. However, many research results concerning the control problems of modular multilevel converters have been proposed in the literature which the main control problems are to control the grid and differential currents as energy stored in each sub-modules. This paper deals with the modeling and the control of modular multilevel converters. Since the voltage fluctuations between the arms of each phase introduce circulating currents containing a second harmonic component, which distorts the arm currents and may increase the ripple on capacitor voltages, a control approach based on resonant controller is proposed to eliminate the circulating currents. The effectiveness of the proposed control method is illustrated by numerical simulations and compared with a classical approach commonly used in the literature.I.

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Mitigating DC-side power oscillations and negative sequence load currents in Modular Multilevel Converters under unbalanced faults- first approach using resonant PI

Cited by 24 publications

References 11 publications

HVDC Transmission for Offshore Wind Farms

HVDC Transmission for Offshore Wind Farms

Impact of Grid Asymmetries on the Operation and Capacitive Energy Storage Design of Modular Multilevel Converters

Control and performance of modular multilevel converters currents using resonant controller

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