A Hybrid Resonant ZVZCS Three-Level Converter for MVDC-Connected Offshore Wind Power Collection Systems

Ning, Guangfu; Chen, Wu; Shu, Liangcai; Zhao, Jianfeng; Cao, Wu; Mashino, Jun; Chun, Liu; Qiao, Guifang

doi:10.1109/tpel.2017.2758924

Cited by 26 publications

(18 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The features of high-gain voltage and high power should be considered in terms of selecting the DC-DC converter in this application, since the converter are used to boost the voltage generated by wind turbines [64], [89], [98]. In addition, reliability is an important issue because of the difficulty in getting access to the turbine at sea and transporting equipment to installation sites [77].…”

Section: B Offshore Wind Farmsmentioning

confidence: 99%

Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Alhurayyis¹,

Elkhateb²,

Morrow³

2021

IEEE J. Emerg. Sel. Topics Power Electron.

100

View full text Add to dashboard Cite

MVDC technology is a promising solution to avoid installation of new AC networks. MVDC can provide optimum integration of large-scale renewable energy sources, the interconnection of different voltage levels of DC and AC grids with the ancillary services. The development in MVDC depends significantly on the DC-DC converters. Such converters support the modern trends of utilising medium-frequency transformers in power networks. Research on isolated converters technology is in its infancy and limited by the conversion ratio and component ratings. Besides, there is no standards exist covering specific aspects of isolated converter product. Thus, a review of such converters is needed. This work presents, for the first time, a review of the DC-DC power converter families in MVDC grids including the leading families which are isolated and nonisolated converters, as well as other subfamilies comparing the specifications and characteristics. Also, the applications of these converters are provided by focusing on the essential requirements for each application. Index Terms-MVDC grids, DC-DC power converters, dual active bridge (DAB), multilevel converter. TABLE I RECOMMENDED CLASSES FOR MVDC VOLTAGE MVDC Class (kV) Nominal Rated Voltage (kV) Maximum Rated Voltage (kV)

show abstract

Section: B Offshore Wind Farmsmentioning

confidence: 99%

Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Alhurayyis¹,

Elkhateb²,

Morrow³

2021

IEEE J. Emerg. Sel. Topics Power Electron.

100

View full text Add to dashboard Cite

show abstract

“…The inclusion of resonant inductor Lr in the auxiliary switches behaves as a constant current source and reduces the voltage stress and insulation requirements. The resonant inductor Lr also affects the turn ratio of auxiliary transformer, the current stresses of two main switches and two auxiliary switches and the switches and conduction losses of the switches, and it should be designed small to improve the converter performance so this way ZCS is realised as inspired from [15]. Furthermore, ZCS is a type of soft switching when a switch is turned on/off while the current flowing through it is at zero or very close to zero in order to save energy.…”

Section: Main Zcs Approach and Operation Principlementioning

confidence: 99%

“…The recent advancements of distributed PV capacity has attracted the researchers to integrate it with DC distribution networks, specifically of medium voltage, and the key device connecting them is a MVDC converter with a high voltage ratio. Since the last decade, the MVDC converter having a high rise voltage ratio has been studied widely, such as non-isolated switched capacitor converters [9], and resonant switched capacitor converters [10][11][12], and isolated composite full-bridge zero-current switches (zero current switching, ZCS) inverter [13][14][15][16]. Nonisolated converters do not have the ability to isolate electrical faults between the renewable energy side and the MVDC bus.…”

Section: Introductionmentioning

confidence: 99%

Hybrid resonant three‐level ZCS converter suitable for photovoltaic power MVDC distribution network

Azeem

Tariq

Mehmood

et al. 2020

IET Renewable Power Generation

View full text Add to dashboard Cite

This study presents a hybrid resonant three-level (TL) zero-current-switching (ZCS) converter for distributed photovoltaic power applications accessing medium-voltage DC (MVDC) distribution network. The main constituents of the converter is a neutral point clamped TL circuit, an auxiliary circuit along with two transformers and six switches. The ZCS condition of the TL circuit is reached by operating the auxiliary circuit utilising pulse width modulation technique. It delivers the majority of the power and the switching loss is remarkably reduced. A section on the influence of the turn's ratio of the auxiliary transformer on the current is also presented. The piecewise linear electrical circuit simulation simulation results validate the designed parameter principles. For the sake of comparison, an experimental prototype is developed of 300-1500 V/1500 W to validate the performance of the proposed converter.

show abstract

“…While the insulated‐gate bipolar transistors (IGBTs) have gained increasing attention in high‐voltage high‐power applications due to their much higher voltage/current ratings compared with MOSFETs. Hence, the realisation of zero‐current switching (ZCS) for a SRC is preferred to minimise turn‐off switching loss of IGBTs due to the tail current effect [27, 28], and thus DCM is more attracting.…”

Section: Introductionmentioning

confidence: 99%

Magnetic flux density analysis of series resonant converter operating in discontinuous conduction mode for high‐voltage high‐power applications

Ning

Chen

Ling

et al. 2020

IET power electron.

Self Cite

View full text Add to dashboard Cite

Due to its zero‐current switching characteristic, the series resonant converter operating in discontinuous conduction mode (DCM‐SRC) is suitable for high‐voltage high‐power applications. To meet the requirement of a wide output voltage range, the pulse frequency modulation with constant on‐time can be adopted for DCM‐SRC. By comparing the resonant capacitor voltage with input voltage, it is first discovered that there are two different operation cases with different magnetic flux density (MFD) values for the transformer core. The boundary conditions for the two cases are revealed, and the exact maximum MFD (MMFD) expression of each case is derived. According to the obtained expressions, the MMFD has the smallest value under the lowest switching frequency and increases with the increase of switching frequency for both cases, indicating that the high‐power transformer can be designed at the highest switching frequency. The fundamental cause of higher MMFD case is derived according to the in‐depth analysis of resonant capacitor voltage. Moreover, a transformer turns ratio design guideline can be easily obtained to reduce the MMFD. Both the simulation model and laboratory prototype are established for verification, and the results show that the theoretical analysis is convincing.

show abstract

A Hybrid Resonant ZVZCS Three-Level Converter for MVDC-Connected Offshore Wind Power Collection Systems

Cited by 26 publications

References 26 publications

Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Hybrid resonant three‐level ZCS converter suitable for photovoltaic power MVDC distribution network

Magnetic flux density analysis of series resonant converter operating in discontinuous conduction mode for high‐voltage high‐power applications

Contact Info

Product

Resources

About