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Converter power loss analysis is one of the main knowledge bases to further handle and improve the performance and efficiency of the conversion systems. This paper significantly investigates the power losses in the reduced-switch innovation of the nine-switch inverter powering two common three-phase inductive loads with the potential operation of the common-frequency mode. A new contribution is based...
This paper further describes our work presented in Industry Application Society 2016 Conference, with more details related to the control and operation of the microgrid. The DC microgrid facility was custom designed and implemented at CCNY with minimal off-the-shelf components to enable flexibility and reconfiguration capability. The design steps, requirements, and experimental results of the developed...
This paper proposes a junction temperature estimation method for IGBT power module in three-phase inverter through coupling the temperature-corrected power loss calculation model and Foster thermal model. Considering the structural characteristics of IGBT, the loss calculation model is established with full study about the influence rule of temperature, gate resistance and other factors on the loss...
Impedance source inverters have attracted much attention in recent years due to their ability to behave as voltage elevators/reducers at their output terminals without the need of an extra dc/dc converter to accomplish this task. Among these inverters, the quasi-impedance source inverter (qZSI) is one of the most known topologies. It considers two basic operating states, the no-shoot-through state...
This work investigates maximum efficiency control strategies of permanent magnet (PM) traction machine drives that are adopted in General Motors (GM) hybrid and electric vehicles. First, three different current vector control techniques, Maximum Torque Per Ampere (MTPA), Maximum Torque Per Motor Loss (MTPML), and Maximum Torque Per System Loss (MTPSL), are presented to identify the most attractive...
Multiphase machines have several advantages and are attractive for some applications. Reliability is one of the most important of those advantages. Faults commonly occur in inverter switches and stator windings. In the case of an inverter-fed nine-phase induction machine drive, this paper focuses on experimental results, comparisons and analysis of several types of inverter and machine faults: one,...
A major drawback of the NPC inverter is an unequal power loss distribution among the power devices which leads to unequal temperature stress among them. Therefore, certain power devices experience higher temperature stress, which is the main cause of power device module failure and thus both the power rating and lifetime of the NPC inverter are limited by the most stressed devices. In this paper,...
An original overvoltage mitigation technique is presented in this paper for Sic based motor drives, exploiting an open-end winding motor configuration. According to the proposed solution over-voltage occurring at the terminals of the motor phases is mitigated by driving the two inverters through a modified switching pattern including a suitable dwell time. No passive RLC networks are required, thus...
Steady-state motor efficiency control has been shown to provide significant motor loss savings and efficiency improvement. Including adjustable speed drive inverter losses into the steady-state motor control optimization is also of interest. What is shown here is the effect that these two efficiency improvement schemes have on the distribution of losses between the motor and the inverter when an efficiency...
The four-quadrant converters applied to the locomotive traction have higher requirements for the power density and reliability. Compared with conventional IGBTs, RC-IGBTs have the advantages of low thermal resistance and high current density. In this paper, RC-IGBT is applied to four-quadrant converter and the working characteristics and pulse distribution of four-quadrant converter under the desaturation...
Pulse Width Modulation (PWM) control method has been widely studied and applied in the industrial area. For majority of the conditions, the PWM frequency is fixed to guarantee easier control implementation. However, the time constant of the IGBT thermal system is much lower than that of the inverter fundamental frequency at low speed. The lifetime of the inverter are severely reduced under low speed...
In this paper, design considerations for transitioning from a Si-IGBT based inverter to a SiC-MOSFET based inverter are discussed. An existing Si-IGBT power structure is modified using a footprint compatible SiC-MOSFET module, with changes made to the power structure and gate drive for the high PWM switching frequency required for SiC devices. Design issues such as inductance minimization, EMC mitigation...
Series connected IGBTs provide a useful method to improve the voltage level, and which is a very important approach to achieve high-voltage power converters. However the imbalance of collector-emitter voltages across IGBTs is a key issue that must be addressed. This paper proposed a novel type of series connected IGBT circuit with voltage self-balance by using clamping diode and snubber capacitor,...
Multilevel Inverters play key role in grid integration of photovoltaic (PV) systems. Although power semiconductor devices in multilevel inverters represent the most expensive and vulnerable parts according to the recent reliability surveys. Thermal stresses in power semiconductor devices represent the main cause of their failures. Therefore, improved controllers with lower thermal stresses are highly...
Induction industrial welding is one of the most straightforward application for the power inverter. Practical industrial welders require at the same time power levels up to 1 MW while frequencies are in the range between 200–500 kHz, depending on the characteristics of the tube to be weld. SiC devices, as per its superior high frequency characteristics, are ideal components for this type of high power,...
In this paper a laboratory power inverter platform is proposed. The platform can operates autonomously by choosing an adequate signal processor or controlled by the powerful dSpace 1104 board, facilitating the rapid implementation of the design algorithms. At the same time, scalar and field oriented control of the three-phase asynchronous machine through the ControlDesk tool have been developed. Functional...
Electrolytic Capacitor (E-cap) is one of the lifetime bottlenecks in power electronic converters. In the last two decades, various active power decoupling circuits have been proposed to improve the reliability of the DC link by eliminating the DC-link E-caps. However, additional active devices could change the stresses of the existing converters, whether the system reliability is improving or not...
A novel frequency-domain EMC modeling technique is proposed to predict the conducted electromagnetic interference (EMI) in a three-phase inverter system. The proposed model can predict the conducted emissions up to 30MHz. Moreover, the proposed model can analysis noise source and the noise propagation respectively. Based on the model, the influence of the IGBT stray capacitance on total EMI noise...
High frequency is an effective method to improve transmission efficiency of inductively coupled power transfer (ICPT) system. However, it is hard for the high capacity semiconductor device to meet the high frequency need. In this paper, a novel multiple-frequency inductively power transfer system is proposed. By adopting a novel multiple-frequency topology of inverter, the transfer frequency of the...
This paper presents a new ZVZCS three-level inverter with T-type structure. The proposed inverter can achieve ZCS on arm switches and ZVS on neutral point switches by series connecting the arm switches with resonant inductors and parallel connecting the neutral point switches with resonant capacitors. The proposed inverter can achieve a significant reduction in power loss dissipation. In this paper,...
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