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Conventional voltage-source inverters used for induction motor drives generate a hexagonal space vector structure. In the overmodulation range, the hexagonal space vector structure generates low-order harmonics in the phase voltage resulting in low-order torque ripple in the motor. Inverter topologies with an octadecagonal (18 sided) space vector structure eliminate fifth-, seventh-, eleventh-, and...
In this paper, a variable dc bus control strategy is evaluated for a bidirectional grid connected electric vehicle (EV) charger topology. The EV charger under consideration comprises of an ac-dc 3-φ active rectifier stage followed by a dc-dc dual active bridge (DAB) converter. The voltage of the common dc-link between the ac-dc stage and the dc-dc stage is regulated such that it follows the voltage...
This paper addresses the stability challenges that exist in a bidirectional grid connected electric vehicle (EV) charger. The EV charger under consideration comprises of an ac-dc single phase active rectifier stage followed by a dc-dc dual active bridge (DAB) stage. small-signal models suited for stability analysis of this charger are derived. Controller design considerations are discussed in order...
This paper presents a medium voltage power conversion architecture for grid integration of multi-MW permanent magnet synchronous generator (PMSG) based wind energyc-conversion system (WECS). Converting the low voltage power output of the generator to medium voltage, can reduce the diameter of the power cable significantly. As a result, power loss and the overall cost of the system can be minimized...
This paper presents test results of the control of a pole-modulated permanent magnet synchronous generator (PM-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). Due to the low speed of the WEC, the size of the generator is increased and the machine is designed with large number of poles and concentrated winding. The electromotive...
In this study, design considerations of gate driver for silicon carbide (SiC) power devices is discussed. The work is focused in minimizing the common-mode current injection into the control circuit, thereby adapting the gate circuit to operate at higher dv/dt of fast switching transients. By reducing the common-mode interference with the control circuit, the signal integrity can be increased, spurious...
A hybrid active filter with a new voltage synchronization control loop is proposed to improve the harmonic content of nonlinear active front end converters for mobile mining equipment. This hybrid filter topology utilizes the DC bus established by the AFE and provides load harmonics at the PCC. Unlike traditional hybrid active filters, this topology uses no real power or control loops to maintain...
In this paper, a state-of-the-art controller architecture for controlling modular multi-level converter (MMC) family is proposed. By using this controller architecture, single point of failure in the power converter, controller board or the communication network does not interrupt the functionality of the system. In order to achieve that, a two-dimensional array of controllers are formed to handle...
Advanced control techniques such as Volt-Watt and Volt-VAR Control have been developed for high integration of distributed renewable energy, such as Photovoltaic (PV) resources, on an electric distribution system. However, designing these control parameters which yields the best results in the system is complicated and depends on feeder conditions. This paper proposes a method to properly design the...
The power flow capability of high frequency phase-shifted dc-dc converter depends on transformer leakage inductance and switching frequency. The design of multi-port transformer requires optimized volume and losses with required leakage inductance for rated power flow. Use of fast-switching SiC devices also demand low inter-winding parasitic capacitance for reduced common mode current. The work in...
Designing of gate drivers for high voltage SiC power devices in medium voltage applications is challenging due to high dv/dt and di/dt at the switching instants. During short circuit fault, the device current rises with high di/dt, and eventually the device fails within few of micro seconds if not protected. Short circuit protection of power devices is an essential feature to improve reliability of...
This paper presents a comparative study between a conventional boosted-VSI electric/hybrid electric vehicle (EV/HEV) powertrain converter with alternative topologies including bidirectional CSI, Silicon (Si)-based current-fed Quasi Z-Source Inverter (CF-qZSI), and Silicon Carbide (SiC)-based CF-qZSI. The higher switching frequency operation of SiC MOSFETs enables the size reduction of reactive elements...
The medium voltage (MV) high-speed drives are required for traction, wind energy, marine, aerospace, oil, and gas compressors applications. The MV converter must be able to switch at higher switching frequencies (> 5 kHz) to generate higher fundamental frequency AC input voltages for the motor (≥ 500 Hz) and thereby achieving high speed at the motor output (≥ 15000 rpm). This paper presents the...
This paper proposes an electromagnetic transient model of the Convertible Static Transmission Controller (CSTC) system in shunt-shunt operation mode. This proposed transient model is used for dynamic analysis and system design. Two recently proposed control structures, which aim to suppress the DC link voltage oscillations under unbalanced AC grid, are applied and compared to the conventional state...
Power Hardware in the Loop (PHIL) simulations have recently been developed as a substitution for traditional methods of testing and analyzing real and physical electric power apparatus, especially power electronic based devices. However, due to some inherent characteristics of the PHIL test setup — such as use of power amplifiers, software/hardware interfaces, and real time simulations — there are...
This paper proposes a hybrid convertible static transmission controller (CSTC), in shunt-shunt mode, with dual active filters and photovoltaic (PV) power integration. The combined system aims to back up and control the power of the transmission transformer, as well as, improve the transmitted power quality. The filters are also designed to eliminate the harmonics due to the injected renewable energy...
Single switch capable of blocking 10 kV and higher voltages are presently being developed and demand improved gate drivers for their functioning. Induction based gate drivers have been the foremost solutions in this regard. Design challenges that have been outlined for these drivers are low coupling capacitance, strong magnetic coupling and smaller dimensions with isolation not considered in depth...
This paper presents results of the control of a magnetic gear integrated permanent magnet synchronous generator (MG-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). The generator has two rotors and one stator. By magnetic gearing, the low speed of the outer rotor is amplified to the high speed of the inner rotor, which faces...
Magnetic Core Characterization is returning as a critical area of research. This is due in part to the rise of wide bandgap semiconductors that have enabled new applications, new converter topologies and system designs that are pushing the limits of passive components. Similarly, new core materials are opening design spaces previously unfilled by legacy cores. With all of these new opportunities,...
Voltage unbalance in a three-phase system introduces oscillations to the DC Link voltage and power. Moreover, it causes performance deterioration of a pulsewidth modulation (PWM) of the back-to back voltage source converter systems (BTB-VSC) by producing the double-line-frequency ripples in the dc link voltage and power. This paper proposes a new control strategy by developing the conventional vector...
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