Title :
Control of Three-Phase PWM Rectifiers Using A Single DC Current Sensor
Author :
Bing, Zhonghui ; Du, Xiong ; Sun, Jian
Author_Institution :
Dept. of Electr., Comput., & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA
fDate :
6/1/2011 12:00:00 AM
Abstract :
This paper presents a new current control method for three-phase pulse width modulation rectifiers with active power factor correction (PFC). Conventional three-phase PFC control requires sensing of at least two input phase currents. Since the input line must be isolated from the control circuitry, current transformers or Hall effects current sensors are required for sensing the phase currents, which are bulkier and more expensive than resistive current sensors. Such electromagnetic current sensors are also difficult to integrate with the rest of the control circuitry, representing a major barrier for low-cost integrated PFC control development. The proposed current control method solves these problems by using only the dc-rail current as the feedback signal. The dc-rail current can be easily sensed by a shunt resistor, and the sensed signal can be directly used by the control circuitry without isolation or level shifting. The control method is developed based on a nonlinear average current control principle and avoids the steady-state phase error of conventional linear PI control.
Keywords :
PI control; PWM rectifiers; electric current control; electric sensing devices; feedback; nonlinear control systems; power factor correction; resistors; Hall effects current sensor; active power factor correction; control circuitry; current transformer; dc-rail current; electromagnetic current sensor; feedback signal; linear PI control; low-cost integrated PFC control; nonlinear average current control principle; phase current sensing; shunt resistor; single DC current sensor; steady-state phase error; three-phase PWM rectifier control; three-phase pulse width modulation rectifier; Converters; Current control; Pulse width modulation; Rectifiers; Sensors; Switches; Current sensing; PWM rectifiers; nonlinear current control; power factor correction;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2010.2070809