Circulating Current Control in MMC Under the Unbalanced Voltage

Moon, Ji-Woo; Kim, Chun-Sung; Park, Jung‐Woo; Kang, Dea-Wook; Kim, Jang-Mok

doi:10.1109/tpwrd.2013.2264496

Cited by 214 publications

(37 citation statements)

References 14 publications

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“…8(C), the arm current is controlled to be less than the current capacity of the switching elements because this arm current is restricted to be within the arm capacitor voltage ripple that is less than the current capacity of the switching elements. [9], (B) conventional method [10], and (C) proposed method.…”

Section: Current Limit Methods Considering Sm Capacitor Voltage Ripplementioning

confidence: 99%

See 1 more Smart Citation

Design and Control Method for Sub-module DC Voltage Ripple of HVDC-MMC

Gwon¹,

Park²,

Kang³

et al. 2016

Journal of Electrical Engineering and Technology

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-This paper proposes a design and control method for a high-voltage direction current modular multilevel converter (HVDC-MMC) considering the capacitor voltage ripple of the submodule (SM). The capacitor voltage ripple consists of the line frequency and double-line-frequency components. The double line-frequency component does not fluctuate according to the active power, whereas the line-frequency component is highly influenced by the grid-side voltage and current. If the grid voltage drops, a conventional converter increases the current to maintain the active power. A grid voltage drops, current increment, or both occur with a capacitor voltage ripple higher than the limit value. In order to reliably control an MMC within a limit value, the SM capacitor should be designed on the basis of the capacitor voltage ripple. In this paper, the capacitor voltage ripple according to the grid voltage and current are analyzed, and the proposed control method includes a current limitation method considering the capacitor voltage ripple. The proposed design and control method are verified through simulation using PSCAD/EMTDC.

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Section: Current Limit Methods Considering Sm Capacitor Voltage Ripplementioning

confidence: 99%

“…Reference [10] proposed a control method for the circulating current and inner unbalanced current for an MMC under unbalanced voltage conditions. This control method consisted of DVCC for the ac-side current controller and had an advantage in that the active power did not fluctuate under the unbalanced voltage conditions.…”

Section: Introductionmentioning

confidence: 99%

Design and Control Method for Sub-module DC Voltage Ripple of HVDC-MMC

Gwon¹,

Park²,

Kang³

et al. 2016

Journal of Electrical Engineering and Technology

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show abstract

“…A decoupled current controller for the output and circulating current was proposed in [10] in a method that can be extended to other modular topologies such as the Modular Multilevel Matrix Converter of [11]. A circulating current control method based on energy within the arms and controllers on the positive and negative synchronous reference frame was presented in [13] and under unbalanced conditions in [12]. .…”

Section: A Current Control Methodsmentioning

confidence: 99%

Utilising redundant voltage levels for circulating current control in modular multilevel converters

Konstantinou

Pou

Ceballos

et al. 2015

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society

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Abstract-Control of the circulating current in the modular multilevel converter (MMC) is one of the major tasks for the proper operation of the converter topology. This paper develops a controller for the circulating current of the MMC that utilises the redundant voltage levels in 2N +1 modulated MMCs in order to regulate the current to its reference. The main advantages of the approach are the elimination of control loops that generate the voltages for the control of the circulating current, simple implementation and very fast dynamic performance. The application of the control is also independent of the circulating current reference. The simplicity and effectiveness of the proposed controller is illustrated through simulations and experimental results.

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“…The common internal failures are IGBT short-circuit and open-circuit faults. The fault-tolerant operations of MMCs under external failures have been extensively investigated [5][6][7][8][9][10][11][12], and the IGBT short-circuit fault detection and protection techniques in terms of the internal failures are relatively mature and have been embedded into commercial gate driver boards. Compared to the IGBT short-circuit fault, the IGBT open-circuit fault is not obvious for quick detection and it results in overcurrent, overvoltage, and waveform distortion problems, leading even to the failure of the whole MMC system.…”

Section: Introductionmentioning

confidence: 99%

The Fault Detection, Localization, and Tolerant Operation of Modular Multilevel Converters with an Insulated Gate Bipolar Transistor (IGBT) Open Circuit Fault

Zeng

et al. 2018

Energies

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Reliability is one of the critical issues for a modular multilevel converter (MMC) since it consists of a large number of series-connected power electronics submodules (SMs). In this paper, a complete control strategy including fault detection, localization, and tolerant operation is proposed for the MMC under an insulated gate bipolar transistor (IGBT) open circuit fault. According to the output characteristics of the SM with the open-circuit fault of IGBT, a fault detection method based on the circulating current and output current observation is used. In order to further precisely locate the position of the faulty SM, a fault localization method based on the SM capacitor voltage observation is developed. After the faulty SM is isolated, the continuous operation of the converter is ensured by adopting the fault-tolerant strategy based on the use of redundant modules. To verify the proposed fault detection, fault localization, and fault-tolerant operation strategies, a 900 kVA MMC system under the conditions of an IGBT open circuit is developed in the Matlab/Simulink platform. The capabilities of rapid detection, precise positioning, and fault-tolerant operation of the investigated detection and control algorithms are also demonstrated.

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Circulating Current Control in MMC Under the Unbalanced Voltage

Cited by 214 publications

References 14 publications

Design and Control Method for Sub-module DC Voltage Ripple of HVDC-MMC

Design and Control Method for Sub-module DC Voltage Ripple of HVDC-MMC

Utilising redundant voltage levels for circulating current control in modular multilevel converters

The Fault Detection, Localization, and Tolerant Operation of Modular Multilevel Converters with an Insulated Gate Bipolar Transistor (IGBT) Open Circuit Fault

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