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Blanking time, also referred to as dead-time, is one of the dominant sources of output current and voltage distortion in pulse-width modulated power amplifiers. Extensive studies are known on elimination, minimization, and compensation of the effect. Most techniques achieve a reduction of the distortion but are not capable of completely removing it. Topologies like the opposed current converter do...
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...
This paper deals with a 3-phase H-bridge inverter feeding a Permanent Magnet Synchronous Machine drive. An innovative Space Vector PWM strategy gathers electric vehicle (EV) specifications and objectives like high reachable base speed, minimization of zero-sequence current ripple and switching losses. In this paper, authors present experimental results performed on inductive inverter prototype.
This paper proposes a systematic procedure to evaluate, compare and select different modulation techniques for a medium voltage variable speed drive. Several indicators are proposed to be analyzed, mainly based on thermal analysis, voltage limitations, dc bus evaluation and load current quality. The suggested procedure is evaluated on a simulation based analysis in a 6.6 kV adjustable speed drive...
This paper deals with a transformer-less Variable Speed Drive based on High Power Medium Voltage PWM Voltage Source Converters connected to a distribution network without transformer. This technology represents the new generation of high efficient and compact power conversion solution. The transformer-less “architecture” of this variable speed drive was proposed thanks to a global system study combining...
The optimal choice of switches within a hysteresis controller with a d-q-related constraint is discussed in this paper. The hysteresis controller controls a bidirectional two-level three-phase standard inverter. This paper expands the options of switching processes to a former published d-q-hysteresis controller. Despite a separate active and reactive hysteresis constraint which is offered, further...
We present in this paper a control of an induction generator wind turbine connected to the grid. We applied a modulated hysteresis direct torque control (MHDTC) to the induction generator (IG). This control strategy consists in superposing to the torque reference a triangular signal, as in the PWM strategy, with the desired switching frequency. We obtain a new modulated reference which is compared...
This paper points out the generic matrix approach to design Pulse Width Modulation strategies of three-phase Voltage Source Inverters. This well-known problem has infinitely many solutions, and many modulation methods already exist. This mathematical approach deserves to be explored by its rigor and must identify known but also new solutions.
A new generalized space vector modulator for cascaded multilevel converters is presented, featuring centralized control, fault tolerant and common mode voltage reduction capabilities. The SVPWM technique is based on the redundancy properties inherent in multilevel modulation schemes and is validated through a case study. Simulation and experimental results are presented.
This paper presents an adapted space vector modulation scheme for modular multilevel converters cascaded to higher levels. Instead of extending a single hexagon to the regions corresponding to the number of levels, this scheme uses multiple overlapping hexagons which are phase displaced relative to each other. The approach simplifies the modulation algorithm and brings flexibility in shaping the output...
This paper proposes a novel position sensorless control in the overmodulation range of an inverter for IPMSMs with magnetic non-linearity. This paper describes the simultaneous achievement of (1) position sensorless control, (2) robust maximum torque per ampere control in consideration of the magnetic non-linearity in an IPMSM, and (3) robust overmodulation drives of the inverter. First, this paper...
Space Vector Modulation (SVM) approaches that decrease current ripples and switching losses of voltage source inverters for automotive applications and their DSP implementation are presented in this paper. To improve the quality of the energy delivered by the voltage source inverter (VSI), we combine two modulation strategies; Random Space Vector Modulation (RSVM) and Discontinuous Space Vector Modulation...
Inner control of a Modular Multilevel Converter (M2C) based on direct tolerance-band modulation of the arm currents has been studied. This approach is attractive because it allows low switching frequency, directly provides the desired arm-current waveform and enables fast protective actions at the same time as the complexity of the over-all control system is reduced. Issues related to common-mode...
This paper deals with a comparative evaluation of the single-phase “VIENNA I” and the “DBE” rectifiers. Their cores respectively involve one and two coils. They operate in continuous current and PFC modes thanks to an AC side current control. The two coils allow to get a “Double Boost Effect” during each half-period of the mains, then transmitting the stored energy to both DC capacitors. This is not...
Smart grids feature distributed energy resources interfaced to the grid by means of switching power converters. Synergistic control of these units can considerably increase the distribution efficiency and power quality by limiting the unbalance, reactive, and harmonic currents flowing through distribution lines. This can be achieved by a distributed control and communication architecture which implements...
This paper presents a modular control platform which is tailored for teaching and research applications. It aims at being entirely “student-proof” and features software-independent safety mechanisms, extensive signal conditioning and easy-to-use interfaces, dedicated to power electronics. A practical example with various HIL simulation results illustrates the attractiveness of the presented platform.
The addition of Z-source components into the “source” of standard converters enables a boost functionality without the need for additional switch. This relatively recent conversion concept can be extended to the three-level two-stage matrix converter by inserting a single Z-source network into its intermediate dc-link. The topology formed is, therefore, physically not very different. However, its...
The paper presents a space vector based modulation technique able to reduce Common Mode Currents (CMC) in six phase integrated AC motor drives. The proposed modulation strategy performs a suitable selection of the inverter states in order to achieve a considerable reduction of the Common Mode Voltage (CMV) variations, with a slightly reduction of the DC bus utilization compared to the standard Space...
Multilevel Inverters are increasingly being used in high-power and medium voltage applications; there are many modulation techniques available to control their operation. In this paper, the Space Vector PWM Technique (SVPWM) to control a hybrid multilevel inverter is described. The inverter produces thirteen-level, SVPWM, three-phase waveforms using a bidirectional switch, twelve transistors and a...
The design of modulation schemes at low pulse ratios is a known topic. However, most of previous work has focused on Optimized Pulse Patterns, e.g. Selective Harmonic Elimination (SHE). For industrial applications, standard carrier modulators are still highly attractive in many cases. Unfortunately, few papers presented insightful studies on carrier modulators at extremely low pulse ratios. This paper...
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