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

Azeem, Syed Waqar; Tariq, Irfan; Mehmood, Kashif; Ehab, Muhammad; Rizwan, Mian; Mond, Muhammad Asim

doi:10.1049/iet-rpg.2019.1401

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The tail current effect can be minimized by the zerocurrent switching (ZCS) approach, as it reduces the turnoff switching loss [23], [24]. However, to achieve ZCS, the current has to reach zero before the commutation takes place.…”

Section: Introductionmentioning

confidence: 99%

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

Waqar Azeem,

Ehab,

Wang

et al. 2024

IEEE Access

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A zero-voltage zero-current-switching (ZVZCS) full-bridge DC-DC converter, based on a dual transformer with two output filter capacitors, is proposed in this paper. The proposed topology is suitable for application in renewable energy at medium voltage, integrated with a DC collection system. To realize voltage and power regulation for the converter, pulse width modulation (PWM) is employed with a fixed duty cycle for the main switches. Through careful design of the turns ratio of the main transformer, most of the power under full load range is delivered by the main full-bridge circuit, which also achieves zero-voltage switching (ZVS). This significantly reduces the switching losses. A small portion of the total power is delivered by the auxiliary circuit that realizes ZVZCS. Therefore, the turns ratio of the auxiliary transformer can be optimized such that the efficiency of the proposed converter can be improved. The optimzation is discussed in detail, along with the design parameters of the proposed converter. A prototype of 200V-2kV/3kW has been developed to verify the simulation results and validate the working of the proposed scheme.

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Section: Introductionmentioning

confidence: 99%

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

Waqar Azeem,

Ehab,

Wang

et al. 2024

IEEE Access

Self Cite

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“…As a result, the switching frequencies of the converter are increased to a much higher level than those of PWM converters, which enables further shrink of the dimension of the converter and increment of the power density. Due to less switch number and voltage stress, half‐bridge LLC resonant converter with full‐bridge rectifier is widely used in high voltage applications [9].…”

Section: Introductionmentioning

confidence: 99%

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

Ma,

Cao,

et al. 2023

IET Renewable Power Gen

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LLC resonant converter has the features of low noise, high efficiency and power density, which is suitable to be integrated into DC microgrid. Due to severe stresses in the resonant tank, achieving fast and safe transient performance has been challenging for resonant converters. With less switch number and voltage stress, half‐bridge LLC resonant converter with full‐bridge rectifier (H‐F LLC resonant converter) are more suitable for high‐voltage application. To improve the transient response of the converter, this paper proposes a method based fixed center state trajectory for the converter to achieve soft start‐up. To reduce dynamic response time during start‐up, each step of fixed center state‐trajectory is designed optimally for the shortest path with symmetrical current limitation. In addition, the proposed method is also applicable to full‐bridge LLC converters. Moreover, according to the state‐plane analysis, load stepping‐up and stepping‐down transient state trajectories with the shortest path are carried out as well. To minimize the adverse effect of digital delay, fast load transient control based on 3D look‐up table is given based on FPGA‐EP3C25E144I7, which would also significantly reduce the computation requirement of the hardware controllers. The experimental results are verified on a 380V/12V LLC converter prototype at 130 kHz.

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“…Due to the lack of energy storage methods suitable for largescale deployment, most of the distributed photovoltaic power generation still needs to be connected to the upper-level distribution network through grid connection, so the local utilization of photovoltaic power generation is very low. Furthermore, in view of the photovoltaic power generation during the peak period of power generation, the risk of equipment overload or even burn-out is easy to occur [12,13]. The local consumption capacity of distributed power grids in this type of area needs to be improved, and it is necessary to take an careful investigation on and put forward some countermeasures of the power consumption capacity in photovoltaic poverty alleviation areas [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

On-Site Energy Consumption Technologies and Prosumer Marketing for Distributed Poverty Alleviation Photovoltaic Linked to Agricultural Loads in China

et al. 2020

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In China, photovoltaic poverty alleviation projects play important role in promoting social and economic development in poverty-stricken areas. They can help stabilizing and increasing incomes of the poor. However, poverty alleviation photovoltaics are mainly connected to the rural distribution network in large numbers, which have a greater impact on the safe and stable operation of the distribution network, making the rural distribution network difficult to solve the problem of collecting and consuming distributed photovoltaic energies on-site. Meanwhile, photovoltaic poverty alleviation projects mainly rely on subsidies from the government and power grids, and the prosumer marketing methods are inadequate. In this paper, an effective on-site consumption technology for photovoltaic power generation linked to agricultural load for poverty alleviation is discussed, together with new energy management and planning technologies for stable two-way energy flow between photovoltaic power generation and rural distribution networks, which can increase the photovoltaic power supply radius, and deal with load fluctuations, and perform precise reactive power control of agricultural load. Furthermore, a prosumer marketing that can simultaneously create maximum economic benefits for power grid and poverty alleviation targets is proposed. The detailed economic benefits are calculated for a demonstration project in Funan county, Anhui province, China. INDEX TERMS On-site energy consumption, photovoltaic poverty alleviation, prosumer energy management, agricultural load WU LU (S'12-M'16) was born in Bozhou, Anhui Province, China in 1991. He obtained the B.Eng. degree in electrical and electronic engineering (2011) and the Ph.D. degree in electrical power engineering (2015) from The University of Manchester in UK.

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

Cited by 4 publications

References 18 publications

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

On-Site Energy Consumption Technologies and Prosumer Marketing for Distributed Poverty Alleviation Photovoltaic Linked to Agricultural Loads in China

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