Abstract
In this paper, a practical passivity-based control (PBC) with active disturbance rejection control (ADRC) is proposed to improve performance of the Vienna rectifier under unbalanced grid conditions. In general, the traditional double-loop control based on positive and negative sequence transformation is used in Vienna rectifier under unbalanced grid conditions. However, it could not fundamentally solve the additional time delay caused by the second harmonic filter and loss of performance caused by a linear weighted sum of proportional integral (PI) controller. What's more, the complexity of the controller is high for the positive and negative sequence currents need to be controlled separately. The PBC is a nonlinear controller based on energy dissipation and it has strong robustness to interference. Further, the line voltage based PBC in inner current loop can deal with the voltage unbalance effectively and easily without negative sequence transformation. To improve the disturbance rejection ability, the ADRC is applied in outer voltage loop, which could overcome PI's drawbacks of step overshoot and slow response. Under unbalanced grid conditions, the proposed control strategy has good performance, easy implementation and less consuming time with PBC control in inner current loop, and it has strong robustness and fast track performance with ADRC control in outer voltage loop. The detailed mathematical model, control principle and controller design of the Vienna rectifier are thoroughly analyzed. In addition, simulation results based on SIMULINK are also given in the paper. Finally, a downsize 5kW Vienna rectifier prototype is built to validate the correctness and effectiveness of the proposed strategy.
Highlights
The Vienna rectifier, which was proposed by Johann W
Li et al.: passivity-based control (PBC) With active disturbance rejection control (ADRC) of Vienna Rectifier Under Unbalanced Grid Conditions unbalance factor must be less than 2% during a long period of time according to the IEC standard
The dc voltage is always stable at 800V, and the upper and lower capacitors share the same voltage. It proves that the proposed PBC with ADRC control strategy can operate the Vienna rectifier stably with unity power factor and low total harmonic distortion (THD) under balanced grid condition
Summary
The Vienna rectifier, which was proposed by Johann W. J. Li et al.: PBC With ADRC of Vienna Rectifier Under Unbalanced Grid Conditions unbalance factor must be less than 2% during a long period of time according to the IEC standard. The Vienna rectifier is controlled as a positive sequence voltage source [7]–[9], and it works normally under balanced grid conditions. A double-loop based control strategy is used in Vienna rectifier system, which consists of an outer voltage loop and an inner current loop. Compared with linear control and other nonlinear control strategies, line voltages based PBC control strategy in inner current loop can be designed and realized, and be expected to improve Vienna rectifier’s static and dynamic performance under unbalanced grid conditions. A practical PBC with ADRC control strategy is proposed to improve performance of the Vienna rectifier under unbalanced grid conditions. X is the state variable vector, and V is the control input variable vector
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