The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Due to the harmonics produced by inverter supply, the distribution characteristics of rotor copper and iron losses become more complicated in the inverter-fed induction motor (IFIM). To study the distribution characteristics of rotor copper and iron losses of the IFIM, we propose a new method to identify the harmonics of current density in the rotor bar and flux density in the rotor core using one...
This paper aims to offer insight into the topic of discrete-time ΣΔ ADCs. More specifically, we investigate the impact of non-ideal analog subcircuit parameters on the performance of a 16-bit, 1 kHz, differential second order, 1-bit quantizer, sigma-delta modulator in a 180 nm technology. The parameters in question are OPAMPs slew rate and gain which fulfill the role of fully differential, discrete-time...
In high speed systems, the recent trend is to couple the electric machine directly to the mechanical shaft, in order to avoid the use of a gear-box and to increase the overall efficiency and reliability. Surface Permanent Magnet mounted (SPM) machines are usually adopted in such systems for their high torque density thanks to rare-earth PMs. The cost of rare-earth PMs together with the risk of their...
This paper develops an analytical model to study the performance of dual-wound three-phase surface permanent magnet synchronous machines under normal operating conditions and various fault scenarios. A generic analytical model of inductance calculation is developed considering multiple layers of coils in the stator slots for different slot-pole combinations. The performance of three dual-wound machine...
Reliability of dc-link capacitors in modern design of power electronic converters is an important aspect that needs to be considered. The requirement of applying condition monitoring for health status estimation in many reliability-critical applications have been a focused demand. The existing capacitor condition monitoring methodologies are suffering from shortcomings such as, low estimation accuracy,...
Parallel three-level T-type inverters (3LT2Is) can increase power rating and reliability, but the circulating current problem will arise. Unbalanced conditions including unbalanced filter inductances and unbalanced grid voltage have negative effects on the operation of parallel 3LT2Is. This paper presents an improved repetitive control scheme for circulating current suppression in parallel 3LT2Is...
An inter-turn fault significantly affects the electromagnetic properties in electric machines, and its propagation may quickly lead to the shutdown of the machines within a few seconds. To build the prediction or detection techniques of the fault, a fault analysis should be carried out. Generally, most faults are analyzed by a method using negative-sequence components obtained from symmetrical coordinate...
This paper presents test results of the control of a pole-modulated permanent magnet synchronous generator (PM-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). Due to the low speed of the WEC, the size of the generator is increased and the machine is designed with large number of poles and concentrated winding. The electromotive...
This paper discusses a power rectifier based on a cascaded topology composed of a three-leg cell and three H-bridge cells. Each leg of the three-leg cell is cascaded connected to an H-bridge cell. Since different types of converter are series-connected, the topology is assumed to be hybrid. The capacitors of the H-bridge cells operate as floating capacitors. It is shown that the discussed topology...
Grid-tied Photovoltaic (PV) inverters are required to have harmonics mitigation control to reduce harmonics distortion on the output current caused by the impact of grid background harmonics. In this paper, a decentralized control strategy for reduction of the impact of distorted grid voltage on the AC-stacked PV inverter architecture is proposed. Two control schemes with the selective harmonics mitigation...
This paper presents a new topology of multilevel converter that allows to increase the number of output voltage levels reducing the numbers of semiconductors necessary in comparison with the standard multilevel converters like Active Neutral Point Clamped (ANPC) and Stacked Multicell Converter (SMC). This new topology called Reduced Multilevel Converter (RMC) consists of a tandem connection of basic...
In order to reduce the size of high-voltage flying capacitors in the five-level hybrid-clamped inverter, an improved modulation strategy based on phase-shifted PWM (PSPWM) is proposed in this paper. The four carrier waves are redistributed and the charge/discharge time of the high voltage capacitor can be largely reduced. The only disadvantage of this PWM scheme is that the harmonic characteristic...
To reduce the current loop reference distortion in traditional average current control and total harmonic distortion of line current, this paper employs improved average current control (IACC) of Boost PFC, in which a digital-generated unit sinusoidal half-wave (USHW) is introduced as current loop sinusoidal reference. Aimed at generating USHW with DSP's enhanced capture module correctly and conveniently,...
Multilevel topology and selective harmonic compensation (SHC) can control active power, reactive power, and to provide ancillary functions to support the grid. However, researchers find that with conventional L or LCL filter, multilevel SHC would act as noise source and inject harmonics to the grid by itself. Moreover, the output current of the multilevel converter is sensitive to the error of the...
A hybrid active filter with a new voltage synchronization control loop is proposed to improve the harmonic content of nonlinear active front end converters for mobile mining equipment. This hybrid filter topology utilizes the DC bus established by the AFE and provides load harmonics at the PCC. Unlike traditional hybrid active filters, this topology uses no real power or control loops to maintain...
A comparison of noise reduction currents in 36-24 and 18-12 switched reluctance motors in all operating region is presented. Radial force profile in these two machines are compared. It is seen that the difference in radial force profile causes different optimized current to reduce the noise in switched reluctance motor. Analysis, simulation, and experimental results are presented to verify the proposed...
This paper proposes an analytical method to quantify the effects of current and position sensor errors on torque ripple of a switched reluctance machine (SRM). First, an instantaneous torque equation for SRM is derived using the Fourier series representation. Then, analytical models are developed to describe the non-idealities of current and position sensors in the drive system. The electromagnetic...
Conventional Hybrid Power Quality Conditioner (HPQC) adopts LC coupling branch and L coupling branch in the back-to-back converters to reduce the converter compensation capacity as well as the DC voltage. However, HPQC could only achieve the minimum compensation capacity under certain special load condition. To maintain the converter compensation capacity at a low level under all load conditions,...
Harmonic and interharmonic distortions are considered as the main power quality issues especially in the distribution networks. The double-stage Adjustable Speed Drives (ASDs) in which the front-end diode rectifier is connected to a rear-end inverter through an intermediate DC-link filter may inject significant amount of harmonics and interharmonics into the grid and consequently degrade the grid...
This paper discusses loss reduction of a proposed inverter which outputs a frequency of 13.56 MHz based on a frequency multiplying circuit consists of a multi-phase half-bridge inverter and a multi-core transformer. The proposed circuit realizes loss dispersion to each semiconductors and transformers. As conventional circuits for an Industrial, Scientific, and the Medical (ISM) band, inverters with...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.