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This paper represents the Hardware implementation of three phase three level inverter based DSTATCOM to reduce the THD. Inverter based DSTATCOM system using mc3phac IC. In this project mc3phac IC is used to generate PWM pulses with alternate phases these PWM signals are used to fire the IGBT. The system consists of mc3phac IC, IR2110 IC (IGBT drive IC), two voltage regulators (LM7805, LM7812). In...
Many new cascaded multilevel inverter (MLI) topologies have recently been proposed and published in the literature. All proposed topologies demand significant amount of semiconductor components and input dc supplies, which is considered the main drawback for the implementation of three phase cascaded MLIs. This paper proposes a new generalized concept that could be employed within any existing cascaded...
In this paper, a new multilevel inverter topology which can be operated in both symmetrical and asymmetrical configurations has been proposed. In order to produce all steps of voltage at output, four different algorithms are proposed to find the value of DC sources. The proposed topology reduce switch count, gate driver circuits, total voltage blocking capability and isolated DC voltage sources which...
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...
This paper presents a GaN FET-based 1kW spwm inverter using a promising next generation power semiconductor. A GaN FET-based inverter has various problem expected to the different switching characteristic of an IGBT. So, a different switching characteristic of a GaN FET-based inverter instead of an IGBT-based inverter is compared and analyzed. The experimental results as well as a theoretical analysis...
We applied advanced heat dissipating technology to reduce heat resistances of the key devices to increase the output power density of the inverter. The IGBT modules were direct water-cooled, and the integrated DC-link capacitor was indirect water-cooled. We conducted the simulation and the test, which proved that reducing the heat resistances was effective to improve the output density of the inverter...
In this paper, a basic design scheme of electric engineering maintenance rolling stock (EEMRS) is briefly described, which is composed of six power converters. In order to reduce the size of heatsink and increase the energy conservation and efficiency of power converters, the thermal resistance model of IGBT module and heatsink, and its thermal equivalent circuit are presented. A calculation method...
Reducing switch loss and increasing heat-sinking capability were very important research topic in the high power density inverter for EV/HEV applications. In this paper, an inverter with a new development power module was built. The power module was packed using a hybrid SIC power device to reduce the switching loss and direct cooling technology to decrease the thermal resistance. The double pulse...
In this paper the design of control law to calculate width of PWM pulse to generate the desire output voltage is described. Design of hardware and control law is carried out by considering 100 Watt application(load). This design is carried out with state space variable using digital control technique. Digital controlier is design using pole placement technique to achive desire transient response....
In this paper, two various transformer-based inverters are proposed. The proposed inverters consist of one center-tap transformer, two bidirectional switches and three unidirectional switches. The proposed inverters are capable of increasing the input voltage according to the winding turn-ratio of the transformers and isolating input DC sources with the load, resulting in enhanced reliability. The...
This manuscript introduces an efficient and generalized basic topology adopted for multilevel inverters. It is shown that the proposed structure is in line with significant savings in part counts and control devices. According to the basic topology, a new structure for sub-multilevel inverter is suggested. In continue, cascaded multilevel inverter is realized based on the series connection of n sub-multilevel...
This paper evaluates the state of the art in switching and conductivity losses for ac drives fed from three-phase voltage source cascaded multilevel inverters. Cascaded multilevel inverters schemes having relevance for industrial application are described and their respective advantages and disadvantages are explained. Secondary effects such as the influence of current displacement factor, dependent...
Pulsewidth modulation (PWM) variable speed drives are increasingly applied in many industrial applications that require superior performance. The carrier-based PWM strategy can be improved by adding different zero sequence signals to the reference sinusoidal phase voltages. This paper presents a comparative evaluation of five carrier-based PWM techniques with zero-sequence signal injection for a six-switch...
Reliability of Active Front End (AFE) converter can be improved if converter faults can be identified before startup. Startup diagnostics of the LCL filter can be an useful tool to accomplish this. An algorithm based on Fast Fourier Transform (FFT) of the filter step response is shown to be able to detect variation of filter components. This is extended to consider conditions of short circuit and...
Insulated gate bipolar transistors (IGBT) have evolved significantly and become exceedingly fast. Today, their typical switching speeds are of the order of 100ns. The resulting dv/dt is considerably large and when employed in a variable speed motor drive inverter, ringing over-voltages occur at the motor terminals even with cable as short as 1 meter in length. In any such power converter system, protection...
The global environmental activities in industries requires for motor drive inverters to expand application fields to higher capacity and with higher reliability. The paper introduces some of developments satisfying the requirements. The first development is a cell unit rated at high current in the range of kA. The advanced paralleling technologies are taken in both electric and cooling designs. The...
The impact of GaN devices and the improvement in efficiency while using such devices in three-phase traction inverter for Electric Vehicles are presented in this paper. Two versions of inverters have been illustrated: first one with Si-IGBT devices while second one is built with GaN-MOSFETs with similar rating of voltage and current. The loss model is expounded for both the inverters; thereafter total...
This paper presents the effect of dead-time and its compensation in a voltage source inverter for a scalar controlled induction motor drive at low speeds on light load condition. It is observed that the oscillations in the stator current under light-load conditions in a practical low voltage 690V, 875-kW and medium voltage 6.6kV, 1.8 MW 3-level inverter fed-induction motor drives is due to dead-time...
Induction welding and high frequency hardening are the two most straightforward applications in induction heating 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, while hardening power supplies require power levels up to 400 kW with frequencies...
This paper presents a power-hardware-in-the-loop (PHiL) grid emulator (GE) which is based on switch-mode voltage source inverters (VSI) with the magnetic coupling. The grid emulator is controlled to reproduce the typical grid fault behaviors (under-voltage, interruption, frequency variation, fault-ride-through etc.) for the equipment under test (EUT). In past several different commercial grid emulators...
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