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This paper is focused on the operation analysis of transformer-based ac drive system with three modulated converters connected specifically to windings of power transformer. It provides multilevel voltage to induction machine by means of three sets of converter-side windings of power transformer. A special switching scheme has been disseminated for adjustment of converters, insuring synchronization...
The paper describes and compares algorithms of control and pulsewidth modulation (PWM) of three diode-clamped converters of PV system, insuring both minimization of common-mode voltage and symmetry of the output voltage of system. The analyzed installation includes also three strings of solar panels, connected with dc inputs of the corresponding inverters, and outputs of the inverters are connected...
Modified techniques and algorithms of space-vector pulsewidth modulation (PWM), assuring symmetrical voltage waveforms of voltage source inverters, have been disseminated for overmodulation adjustment of three inverters of transformer-based installation with new interconnection between converters and the inverter-side windings of power transformer. Simulation results show, that novel connection between...
Three-phase voltage source inverter driven induction motor is used in many medium- and high-power applications. Precision in speed of the motor play vital role, i.e. popular methods of direct/indirect field-oriented control (FOC) are applied. FOC is employed with proportional–integral (P-I) or proportional–integral–derivative (P-I-D) controllers and they are not adaptive, since gains are fixed at...
Hextuple-inverter configuration for multilevel nine-phase symmetrical open-winding DC converter is articulated in this work. Power modular unit consists of six classical three-phase voltage source inverters (VSI). Each VSI includes one bi-directional device (MOSFET/IGBT) per each phase and link to two capacitors for neutral connection. A modified single carrier five-level modulation (MSCFM) algorithm...
The paper presents results of research of quad-inverter-based automotive system with combined scheme of PWM control of inverters, supplied by two renewable dc sources (by fuel cells and by battery). It has been shown, that hybrid switching techniques can be used successfully for control of vehicle drive with non-equal (variable) voltages of dc-links. Results of modeling proved the fact of symmetries...
Possibility of hybridization of switching strategies for modulated inverters of six-phase multi-inverter drive has been shown in this paper. Hybrid switching schemes can be used for control of power system with unequal voltages of dc-links. In this case the proposed combined PWM techniques of inverters insure equal magnitude of the fundamental harmonics of the phase voltages for different ratios between...
In this paper, modulation processes have been analyzed in six-phase asymmetrical motor drive on the base of four inverters with discontinuous synchronous modulation. It has been shown, that flexible PWM strategy based on control of switching frequencies of inverters as function of dc voltages allows to improve system performance and to insure voltage waveform symmetries during adjustment range. Simulations...
This paper presents short review of both conventional and non-conventional methods of synchronized space-vector pulsewidth modulation (PWM) for three-level and multilevel inverters and ac drives. Accent has been done on overview of specialized techniques and algorithms of space-vector modulation, allowing continuous voltage waveform symmetries of multilevel systems in the whole control range for any...
Split-phase (dual three-phase or six-phase) drive systems are an interesting alternative of existing standard solutions. This paper describes operation of four-inverter-based six-phase system with special scheme of control and modulation, providing mutual compensation of common-mode voltages of dual inverters and continuous synchronization of the phase voltages. MATLAB-based simulations illustrate...
Multi-inverter and multiphase power electronic installations have additional degrees of freedom for construction of system topology, and for the choice of modulation schemes and algorithms for control of inverters in these systems. It has been shown, that in combined six-phase drives on the basis of two standard inverters and two neutral-point-clamped converters symbiosis of specialized control schemes...
Basic schemes of discontinuous synchronized space-vector modulation (providing continuous phase voltage symmetry), including combined scheme of discontinuous PWM, have been disseminated for control of dual inverters (with multilevel phase voltage) of transformer-based photovoltaic installation. Simulations give a behavior of these systems.
This paper presents results of dissemination of specific schemes of synchronized pulsewidth modulation (PWM) for adjustment of four neutral-point-clamped (NPC) inverters of dual three-phase system. Specifically, this drive includes openend windings induction motor with two sets of windings spatially shifted by 30 el. degrees. Schemes and techniques of synchronized PWM allow continuous phase voltage...
Algorithms of synchronized pulsewidth modulation (PWM), based on special space-vector control scheme (with utilization of minimal number of voltage space vectors), have been applied for synchronous control of four neutral-point-clamped (NPC) inverters feeding six-phase (dual three-phase) drive on the base of asymmetrical open-end windings induction motor. It allows providing continuous synchronization...
A novel method of synchronized PWM has been applied for flexible control of dual neutral-point-clamped inverters for photovoltaic installations. Algorithms of synchronized PWM provide continuous phase voltage synchronization for any operation condition of the system. Simulations show the behavior of a dual-converter-based photovoltaic system with three basic versions of synchronized PWM with low switching...
The paper presents a brief review of the operation of multiphase converters controlled by algorithms of synchronized pulse width modulation (PWM). Basic peculiarities of space-vector-based method of synchronized PWM have been described. Examples of dissemination of this new method are presented for the control of: a) five-phase inverters controlled at both under-modulation and over-modulation ranges;...
The paper presents results of application of a new method of synchronized pulsewidth modulation (PWM) for control of six-phase traction drive with two DC sources. Analysis of operation of six-phase systems with synchronized PWM with both balanced and unbalanced control, depending from the rated power of two DC sources, has been performed. Simulations results are given for basic continuous and discontinuous...
Novel method of synchronous pulsewidth modulation (PWM) has been disseminated for control of cascaded neutral-point-clamped inverters feeding open-end winding induction motor drive with single DC voltage source. Control algorithms provide in this case full elimination of the common-mode voltages both in each inverter and in the load. Phase voltages of the drive system are characterised by quarter-wave...
Novel method of synchronous pulsewidth modulation (PWM) has been disseminated for control of cascaded neutral-point-clamped inverters feeding open-end winding induction motor drive with single dc voltage source. Control algorithms provide in this case full elimination of the common-mode voltages both in each inverter and in the load. Phase voltages of the drive system are characterised by quarter-wave...
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