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High speed motor control is a key technology in the locomotive traction system. Because of the limitation of the switching frequency and voltage level in high power inverter, modulation method with high voltage utilization ratio and lower low-frequency harmonics is necessary. In this paper, a novel PWM method equivalent with the traditional SVPWM method is proposed, which is realized by the comparison...
The paper presents a conception of power electronics inverter based on a modified sigma-delta modulator (SDM) in the inverter's control block. The proposed modulator includes the comparator with dynamic hysteresis instead of a latched comparator, being typically used in 1-bit SDMs. Thank to this feature a resolution of SDM output bit stream is, theoretically, unlimited. As result, value of THD of...
Power electronic converters for medium and high power / voltage applications employ low frequency fundamental switching that is dictated by the necessity to minimize switching losses. There are two major approaches to switching angles determination — Total Harmonic Distortion (THD) minimization and Selective Harmonic Elimination (SHE). For the THD minimization, the switching angles are found so as...
In this paper cascaded h-Bridge multilevel inverter with SPWM technique is presented. Multilevel inverter have high power application & low harmonics due to these applications it is used widely in the area of control and energy distribution. This paper includes performance of 3-Level, 5-Level & 7-Level cascaded H-Bridge multilevel inverter with respect to number of switches, total harmonic...
This paper proposes a nonlinear control system based on a nonlinear observer to manage the active and reactive power within a single-phase-frequency-modulated Dual-Active-Bridge DC/DC converter directly. It is accomplished by employing a nonlinear controller to regulate the direct and quadrature current, id(t) and iq (t), as they are directly proportional to two power components, respectively. A nonlinear...
This paper presents a study on two converter topologies suitable for driving high-speed three-phase electrical machines. In such applications the use of standard inverters with Si-based IGBTs may lead to high switching losses due to the elevated fundamental frequencies of high-speed machines. The use of wide bandgap devices allows reducing losses at high switching frequencies but problems related...
In this paper ground leakage current suppression in a 50 kW 5-level T-type transformerless PV inverter has been presented. Compared to a 3-level T-type PV inverter, this topology allows a simple modulation method such as carrier-based (CB) PWM can be used to suppress the leakage current without the penalty of the traditional methods. Phase disposition (PD) and phase opposition disposition (POD) based...
High penetration of Converter-Interfaced Generation (CIG) presents challenges because there exists no or very little mechanical coupling between CIGs and the power grid. During transients, the operational constraints of the inverters may be exceeded to the point of damaging the inverters or causing the shutdown of the inverters (LVRT logic). This paper proposes a Dynamic State Estimation (DSE) enabled...
The ubiquitous presence of power electronics devices in power conversion applications across various voltage levels creates new challenges for the designers of insulation systems. The stresses applied to insulation systems by power electronics devices require new approaches for evaluating the intensity and frequency content of working electric field strength and degradation processes. Typically these...
Recently multilevel inverters are emerged as very important factor in high power and medium voltage application. Number of inverter topologies have been introduced and used for various application. Among these inverters cascaded MLI is used because of its advantages over other MLIs. Different control techniques are available to control these inverters. This paper presents a comparison of different...
This paper proposes a new hybrid coupled-inductor and cascaded H-bridge (CHB) multilevel inverter. In the proposed topology, one 5-level coupled inductor inverter is cascaded with several H-bridges so that a hybrid multilevel inverter is obtained. The main aim is to use the advantages of both topologies (coupled-inductor and CHB) in one structure. In the 5-level coupled-inductor inverter, the current...
Materials of this paper show possibility of realization of any nonlinear dependences between voltage and frequency (nonlinear V/F (Volt/Hertz) dependences) of the open-loop six-phase drive on the base of four inverters, controlled by specialized algorithms of space-vector modulation. Specific continuous and discontinuous schemes of modulation allow providing in this case symmetry of the phase voltage...
The paper presents the study of a process's calculation in circuits with incommensurable frequencies. In such circuits the analysis of processes is realized by the use of an additional independent variable. Definitions of RMS currents, voltages and active power are introduced on the base of double integrals. Calculations of an active power in circuits with two independent voltage sources and a single-phase...
The paper proposes an original DC-AC inverter that is based on combination of buck converter with standard three-level H-bridge inverter. This inverter uses simple feed-forward control in order to obtain almost sinusoidal output currents and voltages.
This paper deals with the control of single phase voltage source inverter to reduce conductive electromagnetic interference (EMI) by improved chaotic sinusoidal PWM (CSPWM) method. Improvement in conventional CSPWM is obtain by tuning the parameters to maximize certain index, based on analysis of power spectrum density. First, CSPWM principle and its ability to conducted EMI reduction comparing to...
Conergy power converter is among single-phase transformer-less topologies that have been proposed to mitigate the leakage current problem in photovoltaic (PV) systems. It is an NPC derived structure, which significantly reduces the leakage current and improves the efficiency. Conergy includes fewer switches compared to other single-phase transformer-less topologies. The reactive power generation capability...
The paper deals with the implementation of a Multi-level inverter which is based on cascaded half-bridge, producing a 31 level output with high power quality. This paper primarily focuses on generating high level inverter output with optimal number of switches. Fundamental frequency switching method is adapted to trigger the MOSFETs for output voltage level control. Level generation circuit produces...
This paper presents a low power DT sigma-delta modulator for wide variety of sensor application using a ring amplifier for SC-integrator. The topology is a second order modulator with single-bit quantizer. Dead-zone effect of the ring amplifier in oversampling ADC is discussed. The fabricated test chip in 65nm CMOS process achieved SNDR of 62dB and 1MHz signal band at sampling frequency of 102.4MHz...
The main problem shown in the paper is effective control of semiconductor converters, which are used in various applications. Nowadays for the converter control purposes the pulse-width modulation algorithms are applied. But such algorithms does not provide effective converter operation, and it energy characteristics is low-leveled. Combination of pulse-width modulation with control signal premodulation...
The power conversion is one of the major requirements in utilizing the Electricity generated from the Solar Energy. This paper involves the boosting of DC output of the solar panel by Super-Lift Luo Boost Converter. The converter employs the Super-Lift technique to obtain the boosted output voltage. The output voltage of the Super-Lift Luo Boost converter increases in geometric progression. The Super-Lift...
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