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This paper explore the odevity coordinate to conduct virtual space vector modulation for the neutral point clamped inverter. It deduced the mathematical expressions of the duty ratio of six sectors and presented a unified space vector sequence. This modulation simplifies the calculation and eliminates the difference between sectors of virtual space vector algorithm as well as removes the low frequency...
A muti resonant controller for high-frequency-link single-phase inverter is proposed in this paper. An equivalent circuit, which behave just like conventional unipolar PWM inverter is proposed for the converter. The dynamic model of the inverter, which built in continuous domain, is built. The inverter has the advantages of high efficiency, high power density, low-cost, low noise, bidirectional power...
This paper presents a mixed three-level neutral point clamped (NPC) inverter with hybrid modulation method. It enables traditional Si devices and wide bandgap devices integration to reduce power loss and achieve high power density. Simulation results are firstly provided to verify the validity of the proposed approach.
This paper proposes half-wave Class DE low dv/dt rectifier using thinned-out method with delta-sigma (Δ-Σ) modulation. The thinned-out method, which eliminates some switch voltage pulses by maintaining the switch in on-state for one switching period, is applied to the half-wave Class DE low dv/dt rectifier. The thinned-out pulses which are generally given as predetermined pulse patterns are continuously...
Inverters are widely applied in industrial fields. To acquire the analytical solution of sinusoidal pulse width modulation (SPWM) Single-phase inverters, a traditional harmonic balance based method is extended, in which the double Fourier transform is used to describe the nonlinear switching function of the converter. Thus the steady-state periodic solution of the inverter can be obtained by our approach...
This paper further develops the concept of very large size flash-memory-based pulse-width-modulation (PWM) with the implementation of an over-modulation algorithm for a three-phase inverter. The compensation of voltage for linearization is incorporated within the same flash memory with a multi-optimal PWM generator. Using flash memory demonstrates a low cost alternative to advanced processors. This...
The LCL-type grid connected inverter has been widely used as the intelligent power interface between the distributed generation unit and the power grid. To reduce the cost and volume of the filter, it is desirable to design the LCL filter with higher resonance frequency provided that the quality of injected grid current is not compromised. Actually, it is the typical case for the T-type or NPC three-level...
The common-mode current casued by the parasitic parameters in the transformerless multilevel converters degrades the performance of converters and brings security issues. This paper presents a new zero common-mode voltage space vector modulation for common-mode voltage suppression in the five-level modular composited converter. Firstly, the common-mode equivalent circuit model of five-level modular...
Pulse Width Modulation (PWM) control method has been widely studied and applied in the industrial area. For majority of the conditions, the PWM frequency is fixed to guarantee easier control implementation. However, the time constant of the IGBT thermal system is much lower than that of the inverter fundamental frequency at low speed. The lifetime of the inverter are severely reduced under low speed...
This paper proposes the modeling of single phase symmetric flying capacitor multilevel inverter (SFC-MLI) for Static synchronous compensator (STATCOM) application. The proposed topology is composed of cascade-connected five-level SFC modules. The linear current controller with phase shifted and phase disposition pulse-width modulation (PS-PD-PWM) base switching technique has been implemented. To takes...
The multimedia system for e-learning about modulation techniques in three phase voltage controlled inverters is introduced. The multimedia system features for Block commutation, Sine Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM) are illustrated. Advantages of proposed multimedia system for e-learning about modulation techniques in three phase voltage inverters are indicated...
Common mode voltage (CMV) and switching frequency of an inverter fed induction motor drive are dependent quantities. Increase in common mode voltage (CMV) with increase in switching frequency for induction motor drive is studied in this paper. Conventional sinusoidal pulse width modulation technique is used to drive an inverter fed induction motor. It is demonstrated that the peak value of CMV increases...
The active or passive decoupling method has to be utilized to deal with the second-order harmonic existing in the DC-bus of the grid-tied single-phase inverters. Compared with the active decoupling method, the passive decoupling method is simpler, cheaper and more reliable. The electrolytic capacitors are usually used in the DC-bus as typical passive decoupling components. The film capacitors can...
In recent years, the wireless EV chargers have been spotlighted as convenient, safe, and clean apparatus. In this paper, proposed has been a newly developed large-gap wireless power transfer EV charger which can communicate control signal to a power feeding unit from a power receiving unit without any additional communication equipment. The wireless power transfer (WPT) system with a single-ended...
A fully-integrated transmitter is presented in DARPA's DAHI process technology, featuring heterogeneous integration of 45nm SOI CMOS and 0.2pm GaN technologies. This transmitter is capable of transmitting SOQPSK-TG telemetry waveforms across 2–5 GHz with a peak transmitter power efficiency of 41.32% and peak output power of 32.93 dBm. A reconfigurable CMOS phase modulator is implemented to provide...
This paper proposes improved multi-loop control strategies for three-phase four-leg virtual synchronous generator with unbalanced loads. Through the decoupling control of active and reactive power, inverter can simulate the characteristics of synchronous generator, including primary frequency modulation, primary voltage modulation, inertia and excitation characteristics. To improve the dynamic performance...
This paper presents a symmetrical hybrid nine-level inverter with reduced voltage sensors. A capacitor voltage estimation method is proposed based on phase-shifted PWM by only measuring the total DC-link voltage and the multilevel phase voltage. Under certain conditions, a modified algorithm to further reduce the number of voltage sensors is given. Simulation results are presented to demonstrate these...
A Full Redundant Drive consists of two independent drive units each supplying the stator windings of a dual winding synchronous motor. The implementation of a Full Redundant Drive on the Hardware in Loop Simulation platform provides faster and an economical solution for testing the drive control software without any compromise in controller transient and steady state response. This paper describes...
Brushless DC motor in 180° conduction operation may occur the phenomenon the same leg short, in order to solve this problem, the traditional non-isolated three-phase inverter is replaced, and the high-frequency link matrix inverter is studied for driving brushless DC motor 180° conduction operation. In this paper, the non-isolated three-phase inverter is replaced for the brushless DC motor in the...
This paper presents a single stage, unidirectional, three level, three phase high frequency link inverter topology. The proposed topology can be used for applications like grid integration of renewable energy sources such as fuel cell, solar photovoltaic where power flow is mainly unidirectional. The use of high frequency transformer reduces overall system volume and cost as well as improves power...
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