PWM rectifier

About: PWM rectifier is a research topic. Over the lifetime, 2254 publications have been published within this topic receiving 25614 citations.

Control device for three-phase pwm rectifier

Abstract: PROBLEM TO BE SOLVED: To provide a control circuit for a three-phase PWM rectifier capable of reducing a DC ripple superposed to a DC output voltage and the variable component of a DC voltage SOLUTION: A current flowing to a capacitor Co connected between DC output terminals P, N is detected; a high-frequency component is removed from an outputted current detection signal iD through a lowpass filter 17, and further, the current detection signal iD from which the high-frequency component is removed is inputted to a delay integrator 120 as a filter signal, thereby generating a new corrective signal iR in which a corrective signal delayed by one cycle of a system AC power supply and the filter signal are added at every same phase of the system AC power supply; the adjustment of the gain of the corrective signal iR is performed by multiplying a previously set control gain to the signal; and a first reference current amplitude signal I* is corrected by subtracting the gain-adjusted corrective signal iR from the reference current amplitude signal I* COPYRIGHT: (C)2004,JPO

Simulation Study on the Virtual Line Flux Oriented Vector Control of the PWM Rectifier

Abstract: The main circuit of the PWM rectifier is similar to that of an AC machine fed by an inverter.So a virtual line flux has been constructed to serve as the oriented vector instead of the line voltage vector to remove the AC voltage sensors and reduce the cost of PWM rectifiers.A simple virtual line flux observer is proposed based on the method used in AC machines.A simulation model of the AC voltage sensorless virtual line flux oriented vector control of PWM rectifier has been established using Matlab/Simulink.Good steady and dynamic characteristics of this control scheme have been shown by simulation results.

Improvement of output voltage with SVM in three-phase AC to DC isolated matrix converter

Abstract: This paper discusses and evaluates the performance of a 50-kVA three-phase AC to DC matrix converter. Comparing to the conventional converter, which consists of a PWM rectifier and an inverter, the matrix converter does not require a large reactor at the three-phase input side, and require no DC smoothing capacitor at the DC link part. A space vector modulation based on the virtual AC-DC-AC conversion with four-step commutation patterns is proposed for the converter. From the experimental results, the converter can obtain 2.49% THD on the input current and achieves approximately 91.4% efficiency at 40kW.

A Carrier-Based Unipolar PWM Current Controller That Minimizes the PWM-Cycle Average Current-Error Using Internal Feedback of the PWM Signals

Abstract: A carrier-based unipolar pulsewidth modulation (PWM) current controller is described using a one-phase PWM rectifier bridge as a test circuit. The controller PWM signal generator uses a sawtooth carrier signal to obtain both synchronized PWM waveforms and a constant switching frequency. A current-error signal and an amplitude modulation depth signal are used to create the input reference signal to the PWM signal generator. The amplitude modulation depth signal is obtained from the PWM-cycle average of the PWM signal generator output signals. This internal feedback is illustrated using a second-order low pass Butterworth filter. With an appropriately designed low-pass filter, the current-error signal is forced to be centered on zero over a PWM cycle. The maximum peak-peak magnitude of the current-error signal is used as a design guideline for deciding an appropriate gain constant in the controller current feedback loop. The low pass filter design is examined to determine a suitable gain and 20-dB attenuation frequency to minimize the current-error signal. The steady-state and transient operation of the proposed current controller is compared with a proportional-integral controller and an average current-error controller. SPICE simulations and experimental results are used to demonstrate the characteristics of the controller.

PWM rectifier prediction power control method and system based on any period delay

Abstract: The present invention discloses a PWM rectifier prediction power control method based on any period delay. The method comprises a step of calculating the active power and novel reactive power of a current time and predicting the power value of a next time, a step of constructing a target function related to a current time power value and a next time power value, and solving an optimal voltage vector which allows a target function value to be minimum, a step of calculating the action time of the optimal voltage vector, emitting the optimal voltage vector according to the action time of the optimal voltage vector in a control period, and supplementing other times by a zero vector, and a step of obtaining the driving signal of a switch tube. The invention also discloses a PWM rectifier prediction power control system based on any period delay. The invention provides the PWM rectifier prediction power control method and system based on any period delay, the adding of an additional power compensation value is not needed, the amount of calculation is small, the delay period id short, the dynamic response of the system is fast, and the efficient working of a PWM rectifier in the condition of grid voltage balance or unbalance can be realized.