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RISS 인기검색어
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- 저자 : Renxian Cao (검색결과 3 건)
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Robust model predictive control for three-level voltage source inverters
Hong, Jianfeng,Zhang, Xing,Cao, Renxian The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.5
To solve the problem of parameter mismatch in model predictive control (MPC), this paper presents a robust model predictive control method based on a fixed window optimization (FWO) algorithm for a three-level voltage source inverter that only needs to sample the current value. When compared with the traditional observer-based model predictive control (such as the Luenberger observer, sliding mode observer (SMO) and Kalman filter (KMF)), the proposed method does not require an observer with a complicated design, and its algorithm is simple and easy to understand. Meanwhile, high current sampling accuracy is not needed in the proposed method. However, it is necessary in some types of model-free predictive control. In addition, low switching frequency operation and delay compensation are also considered in this paper. In general, the proposed method is simple to implement and does not have high requirements in terms of the accuracy of its current sensor. Experimental results show that the proposed method can accurately estimate parameter values and improve the parameter robustness of MPC.
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Baoji Wang,Xing Zhang,Chao Song,Renxian Cao 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Dual-inverter fed open end winding transformer (OEW-DI) topology can be an alternative scheme of the traditional parallel inverter topology used in high power medium-voltage (MV) grid-connected systems, due to its advantage of lower output voltage harmonics, which can reduce the requirement of the filter inductance. LCL filter is commonly used in this topology because of the attenuation and size tradeoff. Besides, the leakage inductance of the transformer in such systems is a relative large value and should be used properly, but none of the existing paper has noticed this. Therefore, this paper proposes a new arrangement of LCL filter for the OEW-DI topology, in which the transformer leakage inductance is set as the inverter-side inductor, the shunt capacitor and the grid-side inductor are set at the secondary side of the MV transformer. The overall inductance of the recommend filter can save a lot than the existing filters. The comparative analysis and discussions regarding to the existing LCL filter and the proposed one are presented and evaluated through simulation on a 1 MW dual-three-level inverter system and experiment on a 30kW dual-three-level inverter prototype.
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An Optimized Third Harmonic Injection Method for Three-Phase Cascaded H-Bridge Photovoltaic Inverter
Wang Mao,Xing Zhang,Tao Zhao,Yuhua Hu,Fusheng Wang,Zhiqiang Dai,Renxian Cao 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The uneven irradiation and temperature in photovoltaic (PV) modules of three-phase cascaded H-bridge (CHB) inverters will cause the unbalanced output power between solar panels, resulting in unbalanced grid current between three phases. In addition, since each phase can be regarded as a single-phase inverter, the second harmonic voltage pulsation of dc-side capacitors is a problem to be solved. To solve these two problems, a third harmonic injection optimization method on the basis of fundamental frequency zero sequence is proposed in this paper. The third harmonic with the same amplitude of fundamental modulated wave signal is injected into the modulated wave signal when the amplitude of synthesized wave signal is no greater than unity. Otherwise, the amplitude of third harmonic is decreased correspondingly to ensure the amplitude of synthesized wave signal being unity. With this method, the dc-side voltage pulsation is effectively restrained and the power balancing limit of CHB inverter is expanded. The feasibility and effectiveness of this method are verified by an experimental prototype of a three-phase seven-level CHB inverter.
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