| As a great end-use energy, electrical energy has been common enough in our daily life and industrial production. But different devices need different types of electrical energy. And that’s why we need the converters to change the form of electrical energy. In addition, the PWM rectifier plays an important role in all kinds of converters. With the wider application of the rectifier, it must have higher ability of interference elimination and be smaller to satisfy the requirements of different work environments. PWM rectifier without sensors which can not only reduce cost, but also enhance anti- jamming ability and decreasing volume has been attracting increasing attention of researchers. Control technology of the PWM rectifier without AC-Side voltage sensors is researched in this paper.Fundamental principles and establish mathematical models of the PWM rectifier in static three-phase coordinates, static two-phase coordinates and rotary two-phase coordinates are analyzed in this paper. The double closed- loop PI control method is chose after analyzing and comparing with three common control methods. Additionally, double closed-loop PI regulators are designed. After analyzing the fundamental reason of over current during the equipment commissioning, the method of restraining overcurrent is proposed.The fundamental principle of virtual flux method is analyzed in detail. A kind of negative feedback resonant filter which is compared with first order low pass filter and double first order low pass filter in series is proposed. In addition, the parameters of resonant filter are adjusted. What’s more, a simple and effective method is proposed to compensate the delay of virtual flux in this paper. To support the simulation, the figure of PWM rectifier control system without AC-Side voltage sensors is brought forth.PWM rectifier system without AC-Side voltage sensors is designed. The figure of hardware system is brought forth. After clarifying the rated parameters, the AC-side inductance and DC-side capacitor are chose in this paper.Simulation model and experimental platform are both established to verify the PWM rectifier without AC-side voltage sensors. MATLAB simulation and experimental results confirm the correctness and effectiveness of the proposed algorithm. |
