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This paper presents a novel autonomous optimal control strategy to relieve the increasing damage of inverters on PMSMs-driven rail vehicles when the demagnetization fault occurs. IGBTs damages caused by PMSM demagnetization are analyzed firstly. Then, a novel reconfigurable control strategy is proposed for health management of the whole PMSM-Inverter system by adaptively adjusting power distribution...
Reliability prediction is widely used in industry for estimating field-reliability of a system before empirical data are available for the system. The two branches of reliability prediction, statistical based method and physics-of-failure based method are adopted in different industry sectors to make full use of their different merits. However, for power converters in electric drive system, the operation...
In this proposed work a basic unit is developed. A single unit can generate two positive and a zero level at the output. As this basic unit can develop positive levels, for negative levels, H-bridge is in addition connected to it. This is advance cascaded H-bridge multi-level inverter. With this it is possible to generate all output levels i.e. positive, zero and negative level. Also in this paper...
Traction drives frequently operate at large torque and low speed states, which results in large junction temperature fluctuations and high peak value of inverter power devices. Therefore, the reliability of IGBTs will decrease significantly without suitable thermal control. In order to reduce power losses and junction temperature in low speed operation, the main studies of this paper are as follows:...
For clean and economical energy, renewable energy resources are widely used for providing electric supply to the consumers. But renewable resources produce dc supply, so multilevel inverters are required for conversion from dc to ac supply as the output voltage generated by multilevel inverters contain less harmonics as compared to conventional two level inverters. In this paper, a new asymmetrical...
This paper presents Paralleling of inverters with dynamic load sharing. The inverters with lesser power handling capability are paralleled to support the required load instead of going for one inverter with high power handling capability. This reduces the cost of installation and increases reliability of system. In this paper active paralleling technique with VSI inverters is implemented. The RMS...
This article analyzes the effect of the modulation strategy on the thermal behavior of the power devices in AC drives. Continuous and discontinuous modulation methods will be considered. The effects of the switching frequency and of the fundamental frequency on the temperature of the power devices will also be studied.
In high-power-density power electronics application, it's important to be able to predict the power losses of semiconductor devices in order to maximize global system efficiency and to avoid thermal damages of the components. In this paper a novel approach to model the power losses of Insulate Gate Bipolar Transistors (IGBT) in Induction Cooking (IC) application is proposed. The inherent lack of precise...
This paper presents the simulation analysis of three-level Neutral Point Clamped (NPC) converter with bi-directional power flow capacity. Neutral point fluctuation is the major limitation of NPC converter, which is analyzed and minimized in the proposed work. An offset voltage injected in level-shifted PWM estimated online in a switching period is investigated. A control technique is proposed to minimize...
A 180kW high-voltage pulse power supply for gyro-traveling wave tube (Gyro-TWT) is presented in this paper. Gyro-TWT is the most important microwave amplifier in millimeter microwave band. It is widely applied in rader system, communication and industry. The power supply designed in this paper can provide the rectangle pulse with output voltage up to 60kV, current of 3A to ensure normal operation...
Phase symmetry is one of the primary concerns for distribution system operators. Three phase charging infrastructure offers a new method of solving this problem. Here we describe a phase balancing system based on fast charging infrastructure components and evaluate it based on simulations and field tests performed on 22 kW charging infrastructure prototypes in a low voltage grid. As part of a project...
Energy management and control of a PV array and a battery based DC Microgrid is presented in this paper. Design and operation of PV and battery DC-DC converters are discussed in detail. Radiation input to the solar array is an actual variation which was measured in a normal sunny day. Battery is the main component responsible of keeping the DC bus voltage at a constant value by charging or discharging...
The 15kV SiC IGBT has second higher dv/dt turn-off slope above the punch-through level resulting in EMI. Increasing gate-resistance also slows the first dv/dt causing increased switching loss. A snubber capacitor assisted turn-off solves these issues for a high power dual active bridge (DAB) converter based on this device, but the light load turn-on ZVS becomes hard to achieve. This paper proposes...
In this paper, Steinmetz principle has been implemented for the phase current balance of three phase networks by supplying power to both slow as well as fast varying delta connected linear and unbalanced loads at unity power factor. The reactive power compensation of the proposed technique delivers close to unity power factor and also helps active load balancing of the three phase currents efficiently...
This paper discuses the design and simulation of a 40 kVA Power Conditioning System (PCS) for defence applications. The above simulation is a based on double conversion technique. This solid state power converter employing IGBT assisted double power conversion technique. The output of PCS produces electrical power which in turn can be used to power various mobile on board applications such as electronics...
As the number of DC loads are growing in our daily uses, the low voltage DC (LVDC) distribution system is becoming important. Power supplied through the low voltage AC (LVAC) distribution system needs both the AC/DC rectifier and the DC/DC converter to supply the DC loads. In comparison, LVDC system would only need the DC/DC converter to supply the DC loads. Integration of renewable energy sources...
In this paper the author designed a high-power and torque-limited electric wrench driver based on direct torque control, and hope that when the input is single-phase power frequency alternating current, the electric wrench can output limited torque by DTC according to the pre-set speed. And this electric wrench is able to limit the maximum torque and prevents the damage to the device. Also the electric...
In this paper, a hybrid mode control (HMC) is proposed to increase performance of light load operation without an extra hardware for a three phase PWM converter (TPPC). The proposed algorithm changes an operation mode of the TPPC to 3-phase or 2-phase according to the load condition. To select optimal mode change point, performance of TPPC is analyzed. The validity of the proposed algorithm is verified...
This paper compares Silicon Carbide (SiC) MOSFET and IGBT based electric vehicle (EV) traction inverters by considering the cost and efficiency of these two inverters. Commercially available SiC MOSFET CCS50M12CM2 (1200V / 50A) from Cree and IGBT PM50RL1A120 (1200V / 50A) from Powerex are modeled in detail in PSIM to obtain efficiency curves of inverters under different load conditions. The gained...
This paper presents modeling and power quality analysis of an integrated renewable energy system (RES) aimed at supplying electrical power to communities residing at remote locations, far from the grid supply. A decentralized power generation in the form of integrated system is proposed comprising of a solar photovoltaic (PV) system, a wind energy system (WES) and a micro hydro system (MHS) to supply...
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