Switched Control of Three-Phase Voltage Source PWM Rectifier Under a Wide-Range Rapidly Varying Active Load

The aircraft electric actuator is one of the most important kind of electric loads of the future more electric aircraft. The power characteristic of an aircraft electric actuator possesses the feature of rapidly varying in a wide range, and it shows constant power load nature in the small-signal sense. In this paper, a novel dc-bus voltage switched control method of three-phase voltage source pulsewidth-modulated rectifiers (VSRs), which aims to solve the problem of flexible voltage regulating under dynamic loads, is proposed under a cascade structure in rotating synchronous coordinates d-q . Several linear controllers are designed on different operating points of the VSR, and one controller is implemented on the VSR system according to certain switching law. The stability of the proposed control approach is guaranteed based on the common Lyapunov function method. Simulation and experimental results show that the desired control performance is obtained in the voltage regulating of a VSR with wide-range rapidly varying load. Compared with a classical PI controller, the derived switched controller can achieve a considerable reduction in the dip of the dc-bus voltage and a certain reduction in the overshoot of the dc-bus voltage during the control process under an aircraft electric actuator load.

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