A Four-Leg Matrix Converter Ground Power Unit With Repetitive Voltage Control

Abstract

Abstract-In this paper a four-legs matrix converter is proposed as the power conversion core for Aircraft Ground Power Unit (GPU) applications. This structure allows easy management of unbalanced and non-linear loads with minimal disruption of the power supply operation.A hybrid repetitive-traditional control system is proposed to regulate the output voltage of the GPU. This solution reduces the steady state tracking error, maintaining fast dynamics characteristics, and increases the stability of the converter compared to conventional approaches.Simulations and experimental results from a 7.5KW converter prototype are presented to verify the operation of the proposed configuration and to prove the effectiveness of the solution.

A Hybrid Modulation Scheme for Dual-Output Five-Leg Indirect Matrix Converter

“…3 shows that two values of the virtual dc-link voltage are provided over a switching period. Indeed, the voltage V dc is equal to E ab during the application of the first switching state [1][2][3][4][5][6][7][8][9][10]. It becomes equal to -E ca during the application of the second switching state .…”

“…Their more important benefit over traditional ac/dc/ac power conversion topologies is the absence of electrolytic dc-bus bulky capacitors [3] [4]. The latter is suitable to design high compact and reliable power supplies operating in hostile environment such as high temperatures and high pressures.…”

Predictive Current Control With Instantaneous Reactive Power Minimization for a Four-Leg Indirect Matrix Converter

“…There are several topologies that can handle the zero sequence voltage and the current caused by an unbalanced source or load in three-phase, four-wire systems [7], [8]. A direct power converter can also be used to supply energy to an unbalanced three-phase load using a 4Leg-IMC [9], [10]. This type of converter is normally modulated using carrier-based pulse-width modulation (PWM) or threedimensional space vector modulation (3D-SVM) techniques [11], [12].…”

Evaluation of isolated DC/DC converter topologies for future HVDC aerospace microgrids

“…On the LVDC network typically Low Voltage (LV) emergency batteries and other energy storage elements, such as Electro-Mechanical Batteries (EMB) are connected together with the Electrical Power Unit (EPU) which supplies avionics circuitry [11]- [13]. On the HVDC network, High Voltage (HV) generators [14]- [18] provide the required voltage and power, together with HV batteries [11], [12] and other EPU [19], [20], which supplies electric actuators, de-icing systems and other MEA equipment [5], [21]- [23]. Moreover, Starter Generator (SG) systems [6], [24]- [28], together with their Electrical Control Unit (ECU) are able to provide the required power to start the aircraft engines, and generate additional power during flight, on the HVDC or LVDC network.…”