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| Predictive Current Control of Three-Phase Vienna Rectifier Without Grid Voltage Sensors |
| Xiao Huihui1,2, Su Xinzhu1,2, Guo Qiang1,2, Li Shan1,2, Chen Lan1,2 |
1. School of Electrical and Electronic Engineering Chongqing University of Technology Chongqing 400054 China;
2. Chongqing Engineering Research Center of Energy Internet Chongqing 400054 China |
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Abstract Designing the closed loop control system of the Vienna rectifier requires the collection of grid voltage information. However, the use of sensors will increase the cost and complexity of the system hardware. Therefore, a grid voltage sensorless control strategy for Vienna rectifier is proposed. Firstly, the virtual flux mathematical model of the Vienna rectifier was established in the two-phase static coordinate system, and the second-order low-pass filter was used to improve the voltage observer and estimate the grid voltage, which avoids the pure integral operation without increasing the algorithm complexity. Secondly, because the grid voltage estimated by this algorithm has errors, the predictive current control strategy is used to construct the control system. Aiming at the signal lag problem in the acquisition and processing stage of the actual system, a two-step predictive current method is proposed. Finally, the control strategy is proposed for the simulation analysis and experimental verification. The results show that the grid side input current has low harmonic content, the DC output voltage can accurately track the given value and keep running unit power factor, and the system has good dynamic and steady state performance.
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Received: 01 January 2020
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2021, Vol. 36 
