Calculation of power losses for MMC-based VSC HVDC stations

Jones, Phil S.; Davidson, Colin

doi:10.1109/epe.2013.6631955

Cited by 108 publications

(59 citation statements)

References 2 publications

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“…2(b); and the same IGBT is employed to construct a HB-MMC with same dclink voltage and power rating. The loss calculation for both cases are carried out in a numerical simulation as given in [36,37] >1% as suggested by [18,27,37] 0.553% in the case study of 30~40KJ/MVA as suggested by [38] 35kJ/MVA in the case study of [26] 20.55kJ/MVA in the case study of [18] 16.6kJ/MVA in the case study of It is observed from TABLE III that the AFC-bridge offers following key advantages for building high voltage high power capacity converters:…”

Section: B Dc-fault Ride-through Strategymentioning

confidence: 99%

Operation Analysis of Thyristor-Based Front-to-Front Active-Forced-Commutated Bridge DC Transformer in LCC and VSC Hybrid HVDC Networks

Adam

Finney

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-The active-forced-commutated (AFC) bridge employs a symmetrical thyristor-bridge with auxiliary self-commutated full-bridge chain-link (FB-CL) circuit to assist its soft transition and forced commutation. This combination can form a thyristor based voltage source converter (VSC) with significantly reduced on-state losses and dc-fault blocking capability. Due to the full topological symmetry of the AFC-bridge, either current direction or dc-link voltage polarity can be reversed for power flow reversal as for the full-bridge modular multilevel converter (FB-MMC). Thus, the AFC-bridge is compatible with both line-commutated-converter (LCC) and VSC terminals in a multi-terminal high voltage direct current (MT-HVDC) network. This paper investigates its frontto-front (F2F) dc-dc application for matching the regional dc grids in a LCC and VSC hybrid HVDC network.Simulation studies are carried out to demonstrate its potentials as a high efficiency multi-functional solution for dc-dc conversion.Index Terms-Active-forced-commutated bridge, thyristor, IGBT, high efficiency VSC, front-to-front dcdc converter, dc-link voltage reversal, LCC and VSC hybrid HVDC grid.

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Section: B Dc-fault Ride-through Strategymentioning

confidence: 99%

Operation Analysis of Thyristor-Based Front-to-Front Active-Forced-Commutated Bridge DC Transformer in LCC and VSC Hybrid HVDC Networks

Adam

Finney

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

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“…Each IGBT in the sub-modules(SM) is normally switched only at a equivalent frequency of 100-150Hz under Nearest Level Modulation (NLM). As a result, the power loss can be reduced to about 1 % per converter station [4].…”

Section: Introductionmentioning

confidence: 95%

“…The valve power loss can be subdivided into 5 iterms:1) IGBT conduction losses; 2) diode conduction losses; 3) IGBT switching losses; 4) diode recovery losses; 5) IGBT and diode cut-off losses. The formulas for each item of valve power loss has been well developed in [4][5][6][7][8]. To be concise, they are listed in the Appendix.…”

Section: Categories Of Valve Power Lossesmentioning

confidence: 99%

Fast valve power loss evaluation method for modular multi-level converter operating at high-frequency

Fen

Xie

Cheng

et al. 2016

Prot Control Mod Power Syst

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There is no common accepted way for calculating the valve power loss of modular multilevel converter (MMC). Valve power loss estimation based on analytical calculation is inaccurate to address the switching power loss and valve power loss estimation based on detailed electro-magnetic simulation is of low speed. To solve this problem, a method of valve power loss estimation based on the detailed equivalent simulation model of MMC is proposed. Results of valve power loss analysis of 201-level 500MW MMC operating at 50Hz~1000Hz are presented. It is seen that the valve power loss of a MMC increased by 12, 40 and 93 % under 200Hz, 500Hz and 1000Hz operating frequency. The article concludes that in a device with isolated inner AC system, MMC operating at higher frequency will be more competitive than typical 50Hz/60Hz MMC with moderate increase of operating power loss and significant reduction of the size of the AC components.

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“…Generally, conduction losses can be evaluated either through simulations fed with precise curve fit data for device on state voltage as a function of current [8,9] or analytical method based on linear characteristics to achieve average conduction losses [10]. The on-state voltage drop is expressed as…”

Section: Conduction Lossmentioning

confidence: 99%

“…Few have dealt with such important issues as their effects on power losses of the MMCC and on the loss distributions which determine temperature differences between individual semiconductor devices and modules. Some publications have reported power loss studies in MMCC using 2L-HB and 2L-FB modules [8][9][10] but not controlled by PWM schemes. There is no work in the literature investigating power loss in the 3L-FCC modulebased MMCC's.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Pulse Width Modulation Techniques for Losses Reduction in Modular Multilevel Flying Capacitor Converter

Oghorada

Zhang

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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This paper presents the analysis and evaluation of power losses in a modular multilevel flying capacitor converter (MMFCC) controlled by three different pulse width modulation techniques. A new unipolar hybrid PWM scheme, which combines phase disposed PWM (PD-PWM) and phase shifted PWM (PS-PWM), is proposed. Detailed electrical and thermal models of the single star configured FC cells are implemented and simulated using MATLAB/SIMULINK and PLECS. The conduction and switching losses of semiconductor devices and power losses of floating capacitors in the simulated MMCC are evaluated. The results show that the proposed PWM scheme gives the lowest overall power losses and hence the highest efficiency of the three methods under different modulation index variations. Furthermore, the quality of the voltage waveform of the proposed method is as good as that obtained by using PS-PWM.

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Calculation of power losses for MMC-based VSC HVDC stations

Cited by 108 publications

References 2 publications

Operation Analysis of Thyristor-Based Front-to-Front Active-Forced-Commutated Bridge DC Transformer in LCC and VSC Hybrid HVDC Networks

Operation Analysis of Thyristor-Based Front-to-Front Active-Forced-Commutated Bridge DC Transformer in LCC and VSC Hybrid HVDC Networks

Fast valve power loss evaluation method for modular multi-level converter operating at high-frequency

Performance Evaluation of Pulse Width Modulation Techniques for Losses Reduction in Modular Multilevel Flying Capacitor Converter

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