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Sökning: WFRF:(Tu Chunming)

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1.
  • Jiang, Fei, et al. (författare)
  • Optimum control scheme of output voltage based on cascaded H-bridge DVR
  • 2020
  • Ingår i: CSEE Journal of Power and Energy Systems. - : CSEE. - 2096-0042. ; 6:2, s. 249-258
  • Tidskriftsartikel (refereegranskat)abstract
    • This study presents an optimum control scheme to maximize the output voltage level number of the cascaded H-bridge dynamic voltage restorer (CHB-DVR). The relationship between the modulation index and the output voltage level number is analyzed in detail. The compensation reference voltage value is adjusted with the voltage drop depth to obtain high-quality output voltage with an acceptable total harmonic distortion. Thus, the modulation index remains within a certain range and thus meets the requirements of the maximum level number technique (MLNT). In addition, an improvement method based on the MLNT is proposed to achieve minimum active power absorption from a direct current link of the CHB-DVR. The traditional in-phase compensation and optimum control strategies are implemented to analyze the output voltage quality for verifying the feasibility of the proposed approach. Simulation and experimental results show the effectiveness of the proposed control scheme.
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2.
  • Tu, Chunming, et al. (författare)
  • Dynamic voltage restorer with an improved strategy to voltage sag compensation and energy self-recovery
  • 2019
  • Ingår i: CPSS Transactions on Power Electronics and Applications. - : IEEE. - 2475-742X. ; 4:3, s. 219-229
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, an improved control scheme is proposed to improve the voltage quality of sensitive loads using dynamic voltage restorer. The existing control strategies either put emphasis on the optimal control during steady operation stage of compensation or correct the phase angle jump in the initial stage of compensation. In current researches, the impact of phase jump characteristic of voltage sag on the load side after voltage sag recoveries is widely ignored, further, there are still drawbacks in existing energy self-recovery strategies of DVR. Therefore, to improve the overall voltage compensation time while correcting the phase jump and accelerate the energy recovery of dc link side, this paper aims to 1) Propose the strategies to minimum active power consumption during voltage compensation stage and maximum active power absorption during energy self-recovery stage. 2) Deliver smooth transition in dynamic process to ensure the flexible switching between two stages. Theoretical analysis of proposed strategy is been validated through simulation and experimental results.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Guo, Qi (2)
Cheng, Chen (2)
Jiang, Fei (2)
Tu, Chunming (2)
Li, Qing (1)
Cheng, Siju (1)
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Li, Xiaoyun (1)
Xiao, Fan (1)
Gao, Jiayuan (1)
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