Modeling and Robust Control of a Three-Phase Buck+Boost PWM Rectifier (VRX-4)

IEEE Trans. Power Electron.

et al. 2016

Conventional three-phase rectifiers are controlled to achieve good power factor and low THD in the input. In the case of pulsating power loads, the fast dynamic response implies that the load pulses are reflected in the generator. These pulsating loads affect the life time operation of the generator, especially when it is not oversized (as in the case of aircraft applications). In order to smooth the power demanded from the generator, it is preferable to reduce the bandwidth of the output voltage controller for the rectifier but it affects its stability due to the fact that the right half plane (RHP) pole given by the negative impedance of a constant power load requires high bandwidth control loop to compensate it. In this paper, an energy control method is proposed that utilizes the energy stored in the output capacitor of the rectifier to control the output voltage of the rectifier. In such a way, the minimum bandwidth restriction imposed by the RHP pole of the power load is eliminated and the bandwidth of the voltage loop can be defined low enough to demand smooth power from the generator.

Section: Buck-type Rectifiermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Energy Control Method for Three-Phase Buck-Type Rectifier With Very Demanding Load Steps to Achieve Smooth Input Currents

Zhao

IEEE Trans. Power Electron.

et al. 2016

“…The main advantages of this topology are: it does not need a pre-charge circuit, it can still operate with power factor correction when one phase of grid fails [15] and it is easy to control. Considering that in the secondary stage there is a controlled converter, the rectifier can be operated in open loop, thus only two voltage sensors are needed to measure the grid without the necessity of any current sensor as in three phase boost rectifiers.…”

Section: B Topology Selection 1) Active Rectifiermentioning

confidence: 99%

Interleaved multi-cell isolated three-phase PWM rectifier system for aircraft applications

Hensgens

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

et al. 2013

Abstract-Recently there has been an important increase in electric equipment, as well as, electric power demand in aircrafts applications. This prompts to the necessity of efficient, reliable, and low-weight converters, especially rectifiers from 115VAC to 270VDC because these voltages are used in power distribution. In order to obtain a high efficiency, in aircraft application where the derating in semiconductors is high, normally several semiconductors are used in parallel to decrease the conduction losses. However, this is in conflict with high reliability. To match both goals of high efficiency and reliability, this work proposes an interleaved multi-cell rectifier system, employing several converter cells in parallel instead of parallel-connected semiconductors. In this work a lOkW multi-cell isolated rectifier system has been designed where each cell is composed of a buck type rectifier and a full bridge DC-DC converter. The implemented system exhibits 91% of efficiency, high power density (10kW/10kg), low THD (2.5%), and n-1 fault tolerance which complies, with military aircraft standards.

“…Furthermore, the advanced modulation method for the buckThree Phase Buck-Type Reclifiei type rectifier discussed in [2] and [3] is contributing because of its advantageous rms value [4], [5] in the ripple components. In the conventional control method discussed in [6], an inner DC inductor current loop and an outer output voltage loop [7] is implemented based on a resistive load; whereas in this application the rectifier is loaded with a DC/DC converter operating as a constant power source at steady state, which imposes more restrictions in the control design. Notably in this application, the DC/DC Full-Bridge with its load device presents a periodically dynamic power profile (see Pi oa d in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Starting from the conventional modeling approach for the three-phase buck-type rectifier [6], it is generally considered as a controlled current source (I g in Fig. 2) which denotes the DC inductor current in the output filter and can be controlled through an inner fast DC inductor current loop (neglected in Fig.…”

Section: Introductionmentioning

confidence: 99%

Design of energy control method for three-phase buck-type rectifier with very demanding load steps

Zhao

2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014

et al. 2014

Abstract-Conventional three-phase rectifiers are controlled to achieve good power factor and low THD in the input. In the case of pulsating power loads, the fast dynamic response implies that the load pulses are reflected in the generator. These pulsating loads affect the life time operation of the generator, especially when it is not oversized (that is the case in aircraft applications). In order to smooth the power demanded from the generator, it is preferable to reduce the bandwidth of the controller to the rectifier but it affects its stability due to the fact that the right half plane pole given by the negative impedance of a constant power load requires high bandwidth control loop to compensate it. In this paper, an energy control method is proposed to employ the energy stored in the output capacitor of the rectifier to control the amount of power demanded through the rectifier. In such a way the bandwidth restriction for stability is eliminated and the bandwidth of the loop can be set slow enough to ensure smooth power demanded from the generator.