A Decoupled Control Strategy of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System

Liu, Shenquan; Wang, Xifan; Meng, Yongqing; Sun, Pengju; Luo, Hanwen; Wang, Biyang

doi:10.1109/tpwrd.2016.2646384

Cited by 74 publications

(40 citation statements)

References 23 publications

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“…In the M3C, branch currents can be divided into two parts, the basic branch currents in (4) and the additional circulating currents in (19). In combination, the branch currents are written in (20 …”

Section: B Optimal Circulating Currents Injectionmentioning

confidence: 99%

“…This advantage makes M3C more suitable for high-voltage, high-power adjustable speed drive (ASD) applications such as offshore wind-power generations [17] and full-electric marine propulsion systems An Optimal Full Frequency Control Strategy for the Modular Multilevel Matrix Converter Based on Predictive Control [18]. The application of M3C in low-frequency AC transmission (LFAC) systems [19], [20] is also very promising where M3C can substitute the thyristor-based cycloconverter to reduce current harmonics and improve the power factor. However, the frequency coupling of the input and output system in M3C also causes large capacitor-voltage fluctuation when the input and output frequencies get closer [21].…”

Section: Introductionmentioning

confidence: 99%

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An Optimal Full Frequency Control Strategy for the Modular Multilevel Matrix Converter Based on Predictive Control

Fan

Wang

Wheeler

et al. 2018

IEEE Trans. Power Electron.

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Fig. 1 (a), can be used to connect two three-phase electrical systems (input side and output side systems) using nine active branches. Each branch consists of a cascaded connection of full-bridge cells and a branch inductor. This topology was first proposed by R. Erickson and O. Al-Naseem in 2001 [2]. In common with other members of the modular multilevel cascade converter family [1], the M3C can easily reach high voltage ratings as well as significantly reduce voltage harmonics and electromagnetic interference. In addition, the modular structure makes it easier to accomplish construction, maintenance and thermal designs.Initially, the M3C topology was presented and researched without branch inductors. Space vector modulation (SVM) based capacitor-voltage balancing methods are proposed in

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Section: B Optimal Circulating Currents Injectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Optimal Full Frequency Control Strategy for the Modular Multilevel Matrix Converter Based on Predictive Control

Fan

Wang

Wheeler

et al. 2018

IEEE Trans. Power Electron.

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“…In terms of controlling the M3C in an LFAC system, previous control methods such as [15] represent the state-of-the-art. A land located M3C is proposed to interface an LFAC system connecting an offshore wind farm with onshore grid, and the M3C is controlled as a voltage source using a decoupled control strategy.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the cycloconverter has a low power factor and poor quality of output voltage response. They can be represented by the existence of a significant low order harmonic distortion that calls for the need of using large filters [10,13].The modular multilevel matrix converter (M3C), also known as triple star bridge cell converter (TSBCC) [14], has been successfully proposed in the wind energy conversion system (WECS) as a frequency converter [15,16]. The M3C belongs to the modular multilevel converter (MMC) family.…”

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confidence: 99%

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A Novel Control Scheme for Multi-Terminal Low-Frequency AC Electrical Energy Transmission Systems Using Modular Multilevel Matrix Converters and Virtual Synchronous Generator Concept

et al. 2020

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This paper proposes a new control scheme for the low frequency AC transmission (LFAC) system aiming at extending the point-to-point configuration to form a multi-terminal electrical energy network. The multi-terminal low frequency ac (MT-LFAC) system configuration is based on the use of modular multilevel matrix converters (M3Cs) and virtual synchronous generator (VSG) control. The M3C is the next ac/ac converter generation, which is used as an interface with the conventional AC network and the LFAC electrical energy system. Application of VSG control is proposed to enable proper power sharing, to provide synchronization of each terminal, and frequency stabilization, thus, to offer multiterminal forming capability. Two different operation modes are applied in the system to damp the frequency deviation after a dynamic perturbation, which provides additional stabilization feature to the VSG. Frequency restoration mode and commanded mode of power sharing are applied as dynamic states to validate the robustness of the VSG control system. Besides, to solve the negative impact of low X/R ratio in the LFAC electrical energy system, we enhance the VSG control by proposing a virtual-impedance-based solution, which increases the output total impedance on the low frequency side and prevents the coupling between P and Q. The operation of the proposed system is examined by simulation results with a precise model of M3Cs in the PSCAD/ EMTDC software environment (version 4.2.1, Winnipeg, MB, Canada).Energies 2020, 13, 747 2 of 19 delivery. However, neither technology is flawless. For example, the existence of the power electronic switches in the dc circuit breakers make them more vulnerable than the HVAC transmission system, especially when a fault takes place in the converter, due to the low dc-side impedances and sensitive semiconductor power converters [1,2]. On the other hand, the HVAC system offers advantages, such as more reliability of the well-known protection schemes and the change capability of voltage levels using transformers [3]. However, the HVAC transmission system's main disadvantage is the existence of the reactive power in comparison to no reactive power in the HVDC electrical energy system. Due to that, the existence of the reactive power can be translated as losses in the grid [4].The aforementioned points have led to an alternative solution which combines both sets of HVACs and HVDC advantages, known as a low frequency ac (LFAC) transmission system, or a fractional frequency transmission system (FFTS) [5][6][7]. This system transmits the power at a lower frequency range of about 1-60/3 Hz. The LFAC has already been proposed for the offshore wind energy and has offered attractive advantages compared to both transmission solutions. For example, in the HVDC electrical energy system, the implementation of a high capacity dc circuit breaker is difficult due to the absence of the zero crossing points of the DC current [8]. On the other hand, the LFAC system has zero-crossing, thus, the protection is more advantag...

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Dual‐passivity‐based control strategy of modular multilevel matrix converter

Cheng

et al. 2020

Int Trans Electr Energ Syst

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A Decoupled Control Strategy of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System

Cited by 74 publications

References 23 publications

An Optimal Full Frequency Control Strategy for the Modular Multilevel Matrix Converter Based on Predictive Control

An Optimal Full Frequency Control Strategy for the Modular Multilevel Matrix Converter Based on Predictive Control

A Novel Control Scheme for Multi-Terminal Low-Frequency AC Electrical Energy Transmission Systems Using Modular Multilevel Matrix Converters and Virtual Synchronous Generator Concept

Dual‐passivity‐based control strategy of modular multilevel matrix converter

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