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Resonance Parameter of Variable Mode LLC Converter for Auxiliary Converter
XiaoQiong He,Yang Chen,Chen Chen,ZhiQin Zhao,PengCheng Han 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A precise modeling and resonant calculation method are proposed for variable mode LLC resonant converter. With normal operation of the converter, the redundancy of components is reduced. By establishing equivalent circuit model considering device characteristics, DC gain function is deduced. The resonant parameters are solved by simulated annealing algorithm. The DC gain obtained by the general algorithm and the proposed algorithm are compared. The stable operation of the converter is realized by using the control strategy of digital voltage controlled oscillator and intermittent modulation strategy. The feasibility of this research is verified by simulation and experiment.
Han, Pengcheng,He, Xiaoqiong,Zhao, Zhiqin,Yu, Haolun,Wang, Yi,Peng, Xu,Shu, Zeliang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
This study proposes a new modulation strategy to deal with unbalanced output voltage that is based on three-level neutral-point-clamped cascaded rectifiers. The fundament idea is to reallocate the value of the voltage levels generated by each of the modules on the basis of space vector pulse width modulation. This proposed modulation strategy can reduce the switching frequency while maintaining the mutual-module voltage balance. First, an analysis of unbalanced output voltage is reflected. Then a new modulation strategy is introduced in detail. Internal module capacitor voltages are balanced by the selection of redundant vectors. Moreover, the voltage balance ability is calculated. Finally, the feasibility of this modulation strategy is verified through experimental results.
Sequence Pulse Modulation for Voltage Balance in a Cascaded H-Bridge Rectifier
Xu Peng,Xiaoqiong He,Pengcheng Han,Xiaolan Lin,Zeliang Shu,Shibin Gao 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
With the development of multilevel converters, cascaded single-phase H-bridge rectifiers (CHBRs) has become widely adopted in high-voltage high-power applications. In this study, sequence pulse modulation (SPM) is proposed for CHBRs. SPM is designed to balance the dc-link voltage and maintain the smooth changes of switch states. In contrast to phase disposition modulation, SPM balances the dc-link voltage even after removing the load of one submodule. The operation principle of SPM is deduced, and the unbalance degree of SPM is analyzed. All the proposed approaches are experimentally verified through a prototype of a four-module (nine-level) CHBR. Conclusions are drawn in accordance with the results of SPM and its imbalance degree analysis.
Pengcheng Han,Xiaoqiong He,Zhiqin Zhao,Haolun Yu,Yi Wang,Xu Peng,Zeliang Shu 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
This study proposes a new modulation strategy to deal with unbalanced output voltage that is based on three-levelneutral-point-clamped cascaded rectifiers. The fundament idea is to reallocate the value of the voltage levels generated by each ofthe modules on the basis of space vector pulse width modulation. This proposed modulation strategy can reduce the switchingfrequency while maintaining the mutual-module voltage balance. First, an analysis of unbalanced output voltage is reflected. Then a new modulation strategy is introduced in detail. Internal module capacitor voltages are balanced by the selection ofredundant vectors. Moreover, the voltage balance ability is calculated. Finally, the feasibility of this modulation strategy isverified through experimental results.
Sequence Pulse Modulation for Voltage Balance in a Cascaded H-Bridge Rectifier
Peng, Xu,He, Xiaoqiong,Han, Pengcheng,Lin, Xiaolan,Shu, Zeliang,Gao, Shibin The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
With the development of multilevel converters, cascaded single-phase H-bridge rectifiers (CHBRs) has become widely adopted in high-voltage high-power applications. In this study, sequence pulse modulation (SPM) is proposed for CHBRs. SPM is designed to balance the dc-link voltage and maintain the smooth changes of switch states. In contrast to phase disposition modulation, SPM balances the dc-link voltage even after removing the load of one submodule. The operation principle of SPM is deduced, and the unbalance degree of SPM is analyzed. All the proposed approaches are experimentally verified through a prototype of a four-module (nine-level) CHBR. Conclusions are drawn in accordance with the results of SPM and its imbalance degree analysis.
Stability Analysis of External Ramp Compensation on Valley V² Controlled Boost Converter
Haoyang Gan,Shengzhong He,Xiaoqiong He,Songrong Wu,Ping Yang,Minrui Leng 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
V² control has fast transient response so it has been widely used voltage regulator modules. Although valley V² control has been proposed to control boost converter, there still exist instability issues. To stabilize instability caused by small duty or equivalent series resistance of output capacitor, external ramp compensation has been used. However, there is no reference for choosing proper ramp slope. In this paper, a discrete iterative model of valley V² controlled boost converter with external ramp compensation is established. Based on the model, bifurcation behaviors under different duty cycle and ESR are observed as equivalent ramp slope increases. The orbit of converter transfers from chaos to multi-period then to period-1, consistent with maximal Lyapunov exponent. By analyzing loci of eigenvalues, stability boundaries in different operation regions are obtained to guide equivalent ramp slope design. Experimental prototype is also built up to verify the theoretical analysis.
Li Zeng,Pengcheng Han,Tongyue Huang,Xiaoqiong He 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.5
A bidirectional-friendly control strategy of three-phase NPC rectifier under unbalanced voltage for advanced traction power supply system (ATPSS) is proposed in this study. Negative-sequence current and DC voltage ripple are restrained effectively with very low total harmonic distortions (THDs) on the basis of predictive current control theory. First, power balance equation containing only positive-sequence voltage of the three-phase grid voltage is derived, and the secondary fluctuation of instantaneous active and reactive powers on the grid side is analyzed and calculated. Second, expression of the DC-side voltage fluctuation is deduced to fix the calculation of Pref for the optimization of the control system. Third, command current that can achieve bidirectional-friendly control is calculated according to the power expression and the reference voltage value is obtained on the basis of the predictive current control principle. Finally, simulations and experimental results verify the correctness of the theoretical analysis and the effectiveness of the proposed strategy.