An Enhanced Control Scheme Based on New Adaptive Filters for Cascaded NPC/H-Bridge System

Jin-Wook Kang, Hoon Lee, Seung-Wook Hyun, Jintae Kim and Chung-Yuen Won
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Jin-Wook Kang: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
Hoon Lee: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
Seung-Wook Hyun: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
Jintae Kim: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
Chung-Yuen Won: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea

Energies, 2018, vol. 11, issue 5, 1-25

Abstract: This paper studies the voltage fluctuation of dc-link generated in a 13-level cascaded neutral point clamped (NPC)/h-bridge (CNHB) with single-phase active front end (AFE) at the input side of each cell. The voltage fluctuation may deteriorate the power factor (PF) and current harmonics in the system. In this paper, new adaptive filters are proposed to overcome the problem. The center frequency of the proposed filters can be automatically varied, which allows to eliminate the specific harmonics in the dc-link well rather than the conventional one. Therefore, it can reduce the fluctuation of dc-link and maintain high PF and low current harmonic distortion without additional circuits externally or the current harmonics injection technique. As a result, capacitance for the dc-link can be optimally designed, and even cost and volume of the system can be reduced. This paper analyzes reasons of increasing voltage fluctuation theoretically and the conventional filter and proposed two types of adaptive filters are compared. In addition, the optimal design method of the dc-link capacitor necessarily used in NPC/h-bridge is presented. To verify the principle and feasibility of the proposed control method, a simulation and experiment are implemented with the CNHB system.

Keywords: adaptive filter; NPC/h-bridge; cascaded inverter; multilevel converter; harmonics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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