Topology and Control Strategy of PV MVDC Grid-Connected Converter with LVRT Capability

Wang, Huan; Yu, Zhiping; Huang, Xinke; Wang, Yibo; Xu, Huiling

doi:10.3390/app11062739

Cited by 6 publications

(8 citation statements)

References 20 publications

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“…A unidirectional, isolated dc-dc converter was proposed in [19] for interfacing PV strings with an MVdc network. The topology is based on the isolated boost converter [20].…”

Section: Introductionmentioning

confidence: 99%

Phase-Shifted Full Bridge DC–DC Converter for Photovoltaic MVDC Power Collection Networks

et al. 2023

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The connection of photovoltaic sources to a medium voltage dc collection network requires a dc-dc converter having specific grid-connected converter capabilities. This article presents the application of a phase-shifted full bridge (PSFB) converter for medium voltage dc collection networks suited to photovoltaic power plants. The unidirectional structure of the converter is beneficial in terms of cost and simplicity of hardware implementation of the MV circuit components. The design of the PSFB converter is presented considering ratings of 250 kW power, 1.2 kV input, and 20 kV output. A converter model and a novel PSFB input voltage control regulating the dc-link voltage are developed and verified. A tuning method is given taking into account the effect of different transformer leakage inductance values. The behaviour of the PSFB under the PV power production profile and MV network faults is studied in simulation and verified against a reduced-scale prototype with ratings of 30 kW and 350 V / 600 V operating at 20 kHz. The experimental verification of the control is performed considering a real PV power profile. The experimental results under faults show the same response as in simulations. The PSFB fault response is observed to be superior compared to other dc-dc topologies with capacitive output filter only, making it suitable for gridconnected operation.INDEX TERMS DC-DC power converters, photovoltaic systems, medium voltage.

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“…A unidirectional, isolated dc-dc converter was proposed in [19] for interfacing PV strings with an MVdc network. The topology is based on the isolated boost converter [20].…”

Section: Introductionmentioning

confidence: 99%

Phase-Shifted Full Bridge DC–DC Converter for Photovoltaic MVDC Power Collection Networks

et al. 2023

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“…The control of DC SST must ensure that in case of a voltage dip at MVDC terminals, the voltage of the LVDC bus remains stable [9]. Control for FRT of a DC-DC converter based on an isolated boost converter is presented in [10]. An inductor is added at the output, on the MVDC Paper n° 10335 CIRED 2023 2/5 network side, to reduce the speed of discharge of the output capacitor during FRT.…”

Section: Introductionmentioning

confidence: 99%

Fault ride through of DC solid state transformer in medium voltage DC systems

Le Metayer,

Dujic,

Buttay

et al. 2023

IET Conf. Proc.

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…To provide the best grid support, the PCS converter needs not only to survive the grid's abnormal conditions, but also to keep operating under most of these conditions. There are some research works considering the grid requirements in LV SiCbased converters, such as unbalanced grid voltage [38,39], LVRT and HVRT [40,41], fault ride through [42,43], and MV SiC-based converters in terms of LVRT [44,45], unbalance [46], and fault ride through. However, most of these works focused on converter control strategies, while the converter hardware design was rarely discussed.…”

Section: Introductionmentioning

confidence: 99%

Design, Development, and Testing of a Flexible Combined Heat and Power (F-CHP) System With 10-kV SiC MOSFET-Based Power Conditioning System (PCS) Converter

Li,

Gao,

Wang

et al. 2023

IEEE Access

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This paper discusses the design, development, and testing of a flexible combined heat and power (F-CHP) system. It includes two parts: the power conditioning system (PCS) converter, which connects the system to the grid and is the key component to provide grid support services, and the F-CHP central controller, which accommodates the control of local sources, local loads, and the PCS converter. The functions and structures of the central controller are discussed. The central controller's system-level performances are verified with hardware-in-the-loop (HIL) tests, and the mode transition and grid transient performances are validated with power electronic converter-based hardware testbed (HTB) tests. The PCS converter is designed with 10 kV SiC MOSFETs. The grid requirements are considered in the 13.8 kV/1 MW PCS converter design, and the impact of different requirements on the converter design is identified. Also, converter scalability is studied with the paralleling operation. Two 13.8 kV/100 kW converter prototypes are developed to verify the converter design and scalability. The second prototype is an improved design of the first one; the volume is reduced by 49% and the efficiency at the rated output power is increased from 96.4% to 98.4%. The test results of the converter performances, grid support functions, and parallel operation are also discussed.INDEX TERMS 10 kV SiC MOSFET, Flexible Combined Heat and Power (F-CHP) System, grid support, grid requirements, medium voltage converter, power conditioning system (PCS).

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Topology and Control Strategy of PV MVDC Grid-Connected Converter with LVRT Capability

Cited by 6 publications

References 20 publications

Phase-Shifted Full Bridge DC–DC Converter for Photovoltaic MVDC Power Collection Networks

Phase-Shifted Full Bridge DC–DC Converter for Photovoltaic MVDC Power Collection Networks

Fault ride through of DC solid state transformer in medium voltage DC systems

Design, Development, and Testing of a Flexible Combined Heat and Power (F-CHP) System With 10-kV SiC MOSFET-Based Power Conditioning System (PCS) Converter

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