A Novel DC Chopper Topology for VSC-Based Offshore Wind Farm Connection

Xu, Bin; Gao, Chong; Zhang, Jing; Yang, Jun; Xia, Bing; He, Zhiyuan

doi:10.1109/tpel.2020.3015979

Cited by 33 publications

(12 citation statements)

References 20 publications

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“…al., have proposed a new magnetic linked MVDC power converter, as it significantly reduces power losses, owing to its high current carrying capacity and high efficiency (46), whereas Xu et. al, have studied the existing DC chopper topologies, and based on that, have proposed a novel dc chopper topology with both centralized and distributed resistances, for VSC based offshore wind farm connections (57).…”

Section: Transmission Grid and Power Electronic Converter Technologymentioning

confidence: 99%

Global Offshore Wind Scenario: A Review

2022

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Every single ecosystem and environment is on the brink of destruction due to the adverse effects of global warming and pollution caused by the millions of machines and power plants operating all around the world, which primarily use fossil fuels, generating mammoth amounts of greenhouse gases. It is high time that we take action against this ruthless destruction by substituting conventional fossil fuels with green energy sources to generate power. This paper analyzes the current and past trends and developments in the offshore wind energy sector, all across the major regions of the globe, along with transmission, grid and novel power electronic converters, and wind turbine technology. Economics and life cycle assessments have been included to give an overall idea of the economic and financial side of the offshore wind farm sector.

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Section: Transmission Grid and Power Electronic Converter Technologymentioning

confidence: 99%

Global Offshore Wind Scenario: A Review

2022

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“…For R E which needs to absorb huge energy, the air‐cooling system, and the water‐cooling system are two viable options to solve the heat dissipation problem. Because R E in the AFCL is lumped, the air‐cooling system is recommended [35], which is much simpler than the water‐cooling system for the distributed resistor. It can be seen that the reduced fault current falling duration (∆ t ) not only contributes to the reduced energy absorbed by the arrestors, which significantly eases the thermal stress of the MOV, but also reduces the overall absorption energy level of the system.…”

Section: Simulation Case Studymentioning

confidence: 99%

An adaptive‐impedance fault current limiter for accelerating fault current suppression in MMC‐HVDC systems

Duan

Yang

et al. 2022

IET Generation Trans & Dist

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DC fault clearance is one of the critical issues for the modular-multilevel-converter-based high voltage direct current (MMC-HVDC) systems. Employing a hybrid DC circuit breaker (H-DCCB) to isolate the faulty line is a typical method to achieve fast fault clearance. However, the H-DCCB has to interrupt the fault current and absorb the energy up to tens of megawatts in several milliseconds. Through theoretical analysis of the interruption process using the H-DCCB, reducing the equivalent inductance of the fault circuit during the fault falling stage is recommended to accelerate the fault current suppression for the H-DCCBs. This paper proposes a novel adaptive-impedance fault current limiter (AFCL), which contains two coupled DC reactors and an energy absorption branch (EAB). The proposed AFCL can automatically limit the fault current during the current rising stage and works as a DC reactor with a fixed equivalent inductance through a two-state model analysis. Meanwhile, the AFCL contributes to accelerating the decline of the current by adaptively reducing the inductance of the discharge circuit. Consequently, the fault current suppression time and the energy absorbed by the H-DCCB are reduced. Simulation case studies and hardware experiments are carried out to verify the performance and practicality of the proposed AFCL.

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“…Considering that it is also a kind of HVDC solution, the FRT methods of the traditional MMC-HVDC system can still be used. On the one hand, the HVDC chopper is able to dissipate the excess energy to maintain the HVDC voltage [20]. On the other hand, the offshore grid voltages can also be reduced actively to trigger the FRT control of the WTs during the fault [21].…”

Section: Introductionmentioning

confidence: 99%

Harmonic suppression and fault ride‐through method of diode‐rectifier‐based hybrid high‐voltage direct current system for offshore wind farms integration

Fang

Yang

Cai

et al. 2023

IET Generation Trans & Dist

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The diode‐rectifier (DR)‐based high‐voltage direct current (HVDC) transmission is regarded as a low‐cost alternative to the HVDC transmission for offshore wind farms (OWFs) integration. However, the DR would generate harmonic voltages in the offshore grid, which greatly affects the power quality. To solve this problem, this paper utilizes a parallel‐connected small‐capacity auxiliary converter to suppress the harmonic voltages and provide black‐start energy for the OWFs. In addition, the submodule branches (SMBs) of the auxiliary converter can be used as part of the HVDC chopper. On this basis, a coordinated grid fault ride‐through (FRT) strategy is proposed in this paper. After a grid fault occurs, the HVDC chopper constructed by the auxiliary converter is able to constrain the DC‐link voltage. At the same time, the OWFs are controlled to reduce the output active power. As a result, the cost of the FRT can be significantly reduced. The proposed harmonic voltage suppression and the FRT method are verified through the simulation model in Simulink.

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A Novel DC Chopper Topology for VSC-Based Offshore Wind Farm Connection

Cited by 33 publications

References 20 publications

Global Offshore Wind Scenario: A Review

Global Offshore Wind Scenario: A Review

An adaptive‐impedance fault current limiter for accelerating fault current suppression in MMC‐HVDC systems

Harmonic suppression and fault ride‐through method of diode‐rectifier‐based hybrid high‐voltage direct current system for offshore wind farms integration

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