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In this paper, a control method for three single-phase isolated ac-dc converter modules employed to implement an isolated three-phase, three-wire ac-dc converter is presented and its detailed design procedure provided. In the described control the input voltages of the Y-connected single-phase modules with floating common Y point are kept within a safe range by equalizing their input admittances....
Synchronous PI controller is usually used to track current in three-phase PWM rectifier with zero steady-state error which is difficult to achieve in the single-phase system. A novel proportional-resonant (PR) control scheme for single-phase PWM rectifier is proposed in the paper. Compared with traditional PI control and current hystereis control (CHC) methods, the PR control structure is simple and...
Based on the traditional hysteretic current control, this paper presents a control approach using switching frequency closed-loop. A switching frequency feedback link is introduced to control the switching frequency dynamically. It solves the problem of the volatile switching frequency in hysteretic current control, as well as the slow current response of the fixed switching frequency current control...
According to high power factor and accurate outputs DC voltage which are requirements of three-phase rectifier control as known, the research establishment of one outer voltage loop and two inner current loops as double-loop control system. The outer voltage loop could resist disturbance to achieve accurate output; the inner current loop based on space vector control to achieve high power factor....
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
This paper presents the design of a digital programmable control IC which is intended for controlling thyristors to produce a constant current source via a single- phase controlled rectifier. The architecture of the control IC consists of three major parts: a single-phase controlled triggering circuit, an inverse cosine look-up table, and a proportional-integral current controller. All the three parts...
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