A control strategy of converters based on constant extinction area for UHVDC system under hierarchical connection

Han, Pingping; Sun, Haoyu; Tong, Qingyang; Zhang, Yan; Zhong, Chen; Yang, Wei; Yang, Xiangzhen

doi:10.1016/j.ijepes.2021.106968

Cited by 6 publications

(12 citation statements)

References 13 publications

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“…The UHVDC‐HCM system in Figure 1 is implemented with the PSCAD/EMTDC to verify the proposed control strategy. It is found from (28) and the parameters with the Changji‐Guquan UHVDC‐HCM system in Table 1 [37] that Δ I dc,cr is about 0.25 p.u.…”

Section: Simulations and Discussionmentioning

confidence: 99%

“…Compared with the Ref. [37] control, the proposed control better suppresses the fluctuations of α of both layers after the fault. The above findings show that the adjustment effect of the proposed control to α is better than that of the other three controls.…”

Section: Comparison Of Transient Performance With Different Control S...mentioning

confidence: 99%

“…The recovery time of blocking capability of the thyristor is about 400 µs, corresponding to the critical γ, that is, γ cr , of 7 • [14]. Based on CIGRE benchmark model [37,40,41], the constant current control (CCC) with the minimum firing angle limit is applied to the rectifier. The CCC, the current error control (CEC), the CEA, and the VDCOL, are applied to the inverter.…”

Section: Structure and Control Strategy Of Uhvdc-hcmmentioning

confidence: 99%

“…The extinction angle of the non‐fault layer is adjusted by calculating its variation at the fault layer [36]. The gain to compensate the commutation area is defined as 2.5 times of the rated dc current, which may overcorrect the firing angle of the non‐fault layer [37]. The larger value of the extinction angle at two layers found with the ac voltage variation is chosen as the input of the constant extinction angle (CEA) control [38].…”

Section: Introductionmentioning

confidence: 99%

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Suppression to concurrent commutation failure of UHVDC with hierarchical connection mode based on improved dc current prediction

2023

IET Generation Trans & Dist

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For the ultra high‐voltage dc (UHVDC) transmission with hierarchical connection mode (HCM) at the inverter side, local commutation failure (LCF) at one layer after the ac fault may cause concurrent commutation failure (CCF) at the non‐fault layer. The inter‐layer couplings at the ac and dc sides add the difficulty to suppress the CCF. The fault instant may decide the dc current variation during the commutation, which affects the suppression effect. This paper shows the mechanism of the CCF including the inter‐layer ac and dc coupling, and proposes a control method for the inverter at the fault and non‐fault layers. First, an analytical expression among the dc current, ac voltage, and extinction angle of both layers is newly derived to find the dominant factors to the CCF. Second, to improve the calculation accuracy, a three‐point sampling function using Newton interpolation is newly proposed to predict the dc current. Finally, a coordinated control strategy based on the constant extinction area, the overlap‐arc area, and the dominant factor of the CCF is proposed to adjust the firing angle and suppress the CCF. The simulation results using the PSCAD/EMTDC software are given to verify the control effect of the proposed method against the CCF.

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Section: Simulations and Discussionmentioning

confidence: 99%

Section: Comparison Of Transient Performance With Different Control S...mentioning

confidence: 99%

Section: Structure and Control Strategy Of Uhvdc-hcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Suppression to concurrent commutation failure of UHVDC with hierarchical connection mode based on improved dc current prediction

2023

IET Generation Trans & Dist

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“…The following properties must be in UHV transmission networks: long-distances, high capacity, flexible configuration, secure, stable and resilient to severe fault conditions. The world's first ultra-high voltage direct current (UHVDC) transmission line from Zhundong to Wannan is installed in China having 24 GW power, voltage of ±1100 kV with a line length of 3324 km [144].…”

Section: Development Of Uhv Transmission Systemsmentioning

confidence: 99%

Electric Power Network Interconnection: A Review on Current Status, Future Prospects and Research Direction

Imdadullah¹,

Alamri

et al. 2021

Electronics

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An interconnection of electric power networks enables decarbonization of the electricity system by harnessing and sharing large amounts of renewable energy. The highest potential renewable energy areas are often far from load centers, integrated through long-distance transmission interconnections. The transmission interconnection mitigates the variability of renewable energy sources by importing and exporting electricity between neighbouring regions. This paper presents an overview of regional and global energy consumption trends by use of fuel. A large power grid interconnection, including renewable energy and its integration into the utility grid, and globally existing large power grid interconnections are also presented. The technologies used for power grid interconnections include HVAC, HVDC (including LCC, VSC comprising of MMC-VSC, HVDC light), VFT, and newly proposed FASAL are discussed with their potential projects. Future trends of grid interconnection, including clean energy initiatives and developments, UHV AC and DC transmission systems, and smart grid developments, are presented in detail. A review of regional and global initiatives in the context of a sustainable future by implementing electric energy interconnections is presented. It presents the associated challenges and benefits of globally interconnected power grids and intercontinental interconnectors. Finally, in this paper, research directions in clean and sustainable energy, smart grid, UHV transmission systems that facilitate the global future grid interconnection goal are addressed.

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Commutation failure prediction method based on characteristic of accumulated energy in inverter

Zhao

Jiang

et al. 2021

International Journal of Electrical Power & Energy Systems

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A control strategy of converters based on constant extinction area for UHVDC system under hierarchical connection

Cited by 6 publications

References 13 publications

Suppression to concurrent commutation failure of UHVDC with hierarchical connection mode based on improved dc current prediction

Suppression to concurrent commutation failure of UHVDC with hierarchical connection mode based on improved dc current prediction

Electric Power Network Interconnection: A Review on Current Status, Future Prospects and Research Direction

Commutation failure prediction method based on characteristic of accumulated energy in inverter

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