Dynamic Model, Control and Stability Analysis of MMC in HVDC Transmission Systems

Mehrasa, Majid; Pouresmaeil, Edris; Zabihi, Sasan; Catalào, João P. S.

doi:10.1109/tpwrd.2016.2604295

Cited by 102 publications

(48 citation statements)

References 25 publications

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“…To improve the quality of converter output waveform, nearest level modulation (NLM) method has been widely adopted [6]. Compared with two-level and three-level voltage source converters (VSCs), MMC has higher reliability and lower switching frequency [7,8]. Thus, MMC-MVDC has been favored in flexible DC projects such as ±10 kV hand-in-hand China Southern Power Grid [9].…”

Section: Introductionmentioning

confidence: 99%

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

et al. 2018

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Nowadays, the efficient and reliable protection and location schemes for MMC-MVDC (Modular Multilevel Converter-Medium Voltage Direct Current) grid are few. This paper is the first to propose a scheme to not only protect the feeders and the busbar, but locate the segments in MMC-MVDC grid. To improve the reliability, this paper analyzes the transient characteristics of the pole-to-pole fault and then obtains the characteristic frequency band. Based on S-transform, STCFB (S-transform characteristic frequency band) Phase of fault component is utilized to construct the identification criterion for faulty feeder and faulty segment. The whole scheme can be divided into three steps, namely, protection starting criterion, faulty feeder and busbar protection criterion, and faulty segment location criterion. Firstly, the current gradient method is utilized to quickly detect the fault and start the protection device. Secondly, the non-unit protection criterion on busbar and feeders is proposed according to STCFB Phase of the voltage and current fault component. Thirdly, according to the STCFB Phase on both sides of the feeder segment, the faulty segment can be located. A radial MMC-MVDC distribution network model was built in PSCAD/EMTDC software to evaluate the performance of the protection and location method. Simulation results for different cases demonstrate that the proposed scheme has high accuracy, good adaptability and reliability.

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Section: Introductionmentioning

confidence: 99%

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

et al. 2018

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“…With its unique advantages of decentralized energy storages, modular structure, easy redundant SMs (SMs), simple fault identification, and clearance [5], MMC has been widely applied at various levels of power converters, such as high-voltage direct current (HVDC) transmission systems [6,7], DC-DC power electronic transformers [8], battery electric vehicles [9], distributed energy resources (DERs) [10,11], and flexible AC transmission systems (FACTS) [12]. Considering the long-existing issues of low utilization rate of light energy and potential influence on power grid in photovoltaic (PV) grid-connected system, the application of MMC in PV grid-connected systems is gaining more and more attention [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Lots of research has been conducted to find effective control methods for MMC topology [5][6][7]16,17]. Reference [5] proposes a control method based on a dynamic model, where six independent dynamical state variables are considered for effectively attaining the switching state functions of MMCs, as well as for an accurate control of the circulating currents.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [5] proposes a control method based on a dynamic model, where six independent dynamical state variables are considered for effectively attaining the switching state functions of MMCs, as well as for an accurate control of the circulating currents. On basis of this, a multi-loop control strategy based on a six-order dynamic model of the modular multilevel converter is presented [6], and the MMC is well controlled during normal operation.…”

Section: Introductionmentioning

confidence: 99%

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Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Liu

Jin

et al. 2018

Energies

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Abstract:The average switching model of modular multilevel converter (MMC) is built in this paper when the hot reserved strategy is adopted as a fault-tolerant control. When the MMC SM faults, the rest of the SMs cannot support the DC-link voltage, which results in interruption of the inverter. To tackle this issue, a novel fault-tolerant control strategy is proposed to bypass the SM under fault and re-regulate the SM capacitor voltage and carrier phase-shift angle to maintain the main components of circulating current, and reduce the Total Harmonic Distortion (THD) of grid connected current to enable the stable operation of the photovoltaic inverter. The maximum power tracking control is improved to solve the problem of long restoration time when faults occur, based on a constant voltage startup method combined with a fix-step incremental conductance method. Simulations in MATLAB/Simulink and experimental results have verified the feasibility and effectiveness of the proposed control strategy.

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“…Many academic papers have focused on modeling [16][17][18][19], control [20][21][22][23][24], and modulation techniques [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] for MMCs. The multilevel converter pulse width modulation technique is one of the key technologies for MMCs as it affects the harmonic characteristics, voltage balancing and system efficiency.…”

Section: Introductionmentioning

confidence: 99%

Double-Carrier Phase-Disposition Pulse Width Modulation Method for Modular Multilevel Converters

Zhou

Luo

et al. 2017

Energies

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Modular multilevel converters (MMCs) have become one of the most attractive topologies for high-voltage and high-power applications. A double-carrier phase disposition pulse width modulation (DCPDPWM) method for MMCs is proposed in this paper. Only double triangular carriers with displacement angle are needed for DCPDPWM, one carrier for the upper arm and the other for the lower arm. Then, the theoretical analysis of DCPDPWM for MMCs is presented by using a double Fourier integral analysis method, and the Fourier series expression of phase voltage, line-to-line voltage and circulating current are deduced. Moreover, the impact of carrier displacement angle between the upper and lower arm on harmonic characteristics is revealed, and further the optimum displacement angles are specified for the circulating current harmonics cancellation scheme and output voltage harmonics minimization scheme. Finally, the proposed method and theoretical analysis are verified by simulation and experimental results.

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Dynamic Model, Control and Stability Analysis of MMC in HVDC Transmission Systems

Cited by 102 publications

References 25 publications

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

A Novel Protection and Location Scheme for Pole-to-Pole Fault in MMC-MVDC Distribution Grid

Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Double-Carrier Phase-Disposition Pulse Width Modulation Method for Modular Multilevel Converters

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