A Unidirectional Hybrid HVDC Transmission System Based on Diode Rectifier and Full-Bridge MMC

Li, Rui; Xu, Lie

doi:10.1109/jestpe.2020.3015342

Cited by 31 publications

(11 citation statements)

References 39 publications

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“…5) It cannot block the DC short circuit fault current. In [27], a short circuit current transferring thyristor is parallel connected to the FB-MMC to protect it, and the AC side circuit breaker also switches off in DC pole-to-pole fault. In [27], a series-connected DRU and FB-MMC topology is proposed, in which the active power is regulated by a proportional and integral controller that is not applicable to a sending valve for offshore wind power transmission because the OWF active power is stochastic and varying.…”

Section: Introductionmentioning

confidence: 99%

“…In [27], a short circuit current transferring thyristor is parallel connected to the FB-MMC to protect it, and the AC side circuit breaker also switches off in DC pole-to-pole fault. In [27], a series-connected DRU and FB-MMC topology is proposed, in which the active power is regulated by a proportional and integral controller that is not applicable to a sending valve for offshore wind power transmission because the OWF active power is stochastic and varying. Meanwhile, the DC voltage of FB-MMC is only 165 kV with 1100 kV overall DC voltage, so that the reverse FB-MMC DC voltage when blocked is too small to be utilized to block DC short circuit current because of severe overvoltage of FB-MMC SM capacitors.…”

Section: Introductionmentioning

confidence: 99%

“…The transformer for FB-MMC and the compensator and harmonic filter for DRU are unnecessary. The analysis is based on the offshore wind power scenario, considering that the output characteristic of converter is different from that of ideal voltage source in [27]. The main contributions are as follows.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Improved Series-Connected Hybrid Valve Based on Diode Rectifier Units and Full-Bridge MMC for Large-Scale Offshore Wind Power Transmission

Wang

Zhang

et al. 2022

Preprint

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An improved hybrid valve based on diode rectifier units (DRUs) and full-bridge MMC (FB-MMC) to transmit large scale offshore wind power to onshore is proposed to balance the performance and cost of pure DRU- or MMC-based schemes. Approximate one third of DC voltage is constructed by the FB-MMC and the remaining by DRUs. Active power-DC voltage droop control is proposed to regulate the DC voltage of FB-MMC to adaptively transmit the offshore wind farm active power to onshore. Meanwhile, the reactive power consumed by DRUs and generated by wind turbine converters (WTCs) is dynamically balanced by the FB-MMC. During start-up of offshore wind farm, the DC link capacitors of WTCs and auxiliary systems can be energized from onshore. And most importantly, DC pole-to-pole short circuit fault can be ridden-through as quickly as possible by the reverse and double DC voltage of FB-MMC with no severe submodule (SM) capacitor overvoltage after fault occurrence. The system performance is investigated by time-domain simulations in PSCAD/EMTDC. Thus, the feasibility of the proposed scheme is verified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Improved Series-Connected Hybrid Valve Based on Diode Rectifier Units and Full-Bridge MMC for Large-Scale Offshore Wind Power Transmission

Wang

Zhang

et al. 2022

Preprint

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“…Given the defects of the sub-module operation characteristics ex-hibited by the half-bridge MMC type VSC converter, the application of the full-bridge and half-bridge full-bridge hybrid VSC converter was studied as well. Literature [15], [16] studied the commutation failure of the LCC, and compared the transient overvoltage characteristics of the LCC-FBMMC system and the LCC-HBMMC system. Literature [17] analyzed the indirect faults in the station of the bipolar HVDC transmission system.…”

Section: Introductionmentioning

confidence: 99%

Research on Overvoltage Suppression by Blocking Diode and DC Circuit Breaker in LCC-VSC Hybrid HVDC System

Wang

Zhou

2021

IEEE Access

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In this study, a LCC-VSC hybrid HVDC transmission system was taken as an example. The valve and neutral overvoltage of the hybrid HVDC system were simulated and then calculated at the VSC converter station by installing a blocking diode and a DC circuit breaker, as well as by grounding after neutral bus outage. The isolation effect of the blocking diode and the DC circuit breaker on the VSC converter station in the protection and the effect on the DC overvoltage were compared, and the difference was analyzed by complying with the mechanism of overvoltage. The effect of different locations of the blocking diode on the overvoltage suppression was compared, and it was concluded that different locations of blocking diode could raise different requirements for the insulation coordination of the converter valve. By analyzing energy sources of the neutral bus overvoltage at different stages, it was further concluded that the energy stored in the distributed inductance of the metal return line could be a vital source of neutral bus overvoltage energy. On that basis, an overvoltage suppression strategy for grounding neutral bus directly after the stop of the converter station was proposed.

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“…usage of high voltage rated switches, more voltage stresses (d v /d t stresses) on the switches for quick transitions in the voltage levels that limit the two‐level inverters to a low‐voltage and low‐power applications [1] only. The MLIs have various usage in power applications like Flexible alternating current transmission system (FACTS) devices, photovoltaic (PV) applications [2], traction drives [3], High voltage direct current transmission system (HVDC) systems [4], several industrial applications (pumps, conveyors, fans, and blowers) etc. The usage of MLIs results in the shrinkage of the filter size, quality of output voltage is improved, the magnitude of lower order harmonics gets attenuated etc.…”

Section: Introductionmentioning

confidence: 99%

Analysis and implementation of a generalised switched‐capacitor multi‐level inverter having the lower total standing voltage

Majumdar

Mahato

Jana

2020

IET power electron.

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Most of the switched capacitor multi‐level inverters (SC‐MLIs) are designed with a single isolated voltage source and capacitors where voltage levels are obtained by the addition of these sources only. The common problems arise in SC‐MLIs are an unequal number of conducting paths, higher voltage drop across capacitors, sum of total inverter DC link voltages across the highest voltage rated switches and higher total standing voltage (TSV). The motivation of this work is to design a hybrid generalized SC‐MLI with reduced components aiming to maintain a constant voltage across the capacitors, to achieve higher voltage gain with minimum components used, minimum conducting paths, lower TSV, cost‐effective and an efficient inverter. A generalised SC‐MLI structure is also proposed, which can multiply the voltage across the capacitors in a binary asymmetrical manner. The design parameters of the proposed hybrid SC‐MLI topology are compared with the recently developed SC‐MLIs in terms of the number of switches, capacitors, TSV, conducting switches and industrial components cost to prove its superiority and effectiveness of the proposed inverter. The experimental prototype of a specimen 9‐level and 17‐level inverters are implemented using DS1103 and the corresponding results are presented.

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A Unidirectional Hybrid HVDC Transmission System Based on Diode Rectifier and Full-Bridge MMC

Cited by 31 publications

References 39 publications

An Improved Series-Connected Hybrid Valve Based on Diode Rectifier Units and Full-Bridge MMC for Large-Scale Offshore Wind Power Transmission

An Improved Series-Connected Hybrid Valve Based on Diode Rectifier Units and Full-Bridge MMC for Large-Scale Offshore Wind Power Transmission

Research on Overvoltage Suppression by Blocking Diode and DC Circuit Breaker in LCC-VSC Hybrid HVDC System

Analysis and implementation of a generalised switched‐capacitor multi‐level inverter having the lower total standing voltage

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