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.
This paper explains a new control strategy for controlling active and reactive powers in a single phase Z or qZ source inverter to increase the active functions of these converters when they are interfacing with distributed energy resources. The proposed strategy is based on a d-q synchronous reference frame and it is validated by simulation in a single phase three-level neutral-point-clamped topology...
In this paper, a wireless current sharing Scheme for paralleled online uninterruptible power system (UPS) inverters is proposed, based on which effective power sharing under phase locking condition and fast dynamic response of sharing load are obtained. The output impedance of UPS inverter is designed to be resistive, and the droop method based on resistive output impedance is employed. Moreover,...
Grid connected voltage source inverters require both current regulation and synchronisation to control the power flow and to maintain stability during grid disturbances. For this type of application, non-linear current control of VSIs using techniques such as hysteresis current regulation offer advantages compared to linear current regulation, such as inherent over-current protection, robustness to...
This paper presents an electro-thermal simulation model to estimate the power devices junction temperatures of traction inverter. The model includes four sub-systems: hybrid electric vehicle simulation, model of traction motor, temperature dependent power loss model, and the thermal model of traction inverter. Firstly, load profile of the traction inverter is obtained considering the vehicle dynamic,...
Control techniques, applied to single-phase two-stage grid-connected photovoltaic (PV) systems, mainly achieve functions of maximum power point tracking (MPPT), voltage adjustment at inverter DC-link, and grid current control. Conventional control techniques require measurements of PV voltage and current, DC-link voltage, and grid voltage and current. Commonly, sensorless techniques are proposed to...
This paper describes expansion of operating range and improvement of torque response of Permanent Magnet Synchronous Motor (PMSM) drive by using Model Predictive Control (MPC). Controller based on MPC selects the voltage vector of inverter by predicting and evaluating future states (torcue, current) of PMSM. Proposed torque control system of PMSM based on MPC makes it possible to drive PMSM in overmodulation...
This paper presents a model predictive-based current control for PMSMs. In our approach, a reference voltage to an inverter can be strictly treated as a discrete voltage vector so that the output saturation of the inverter is avoided. Various constraints can be also taken into consideration in our approach. Both tolerance ranges for control variables and number of switching operations are incorporated...
Rapid advancement of gallium nitride (GaN) based device technologies enables the possibility to design inverters that have superior performance capabilities compared to Si-based inverters. It is prevalently acknowledged that GaN-based switching devices outperform the Si-based counterparts in many aspects such as lower power consumption, and faster switching frequencies. GaN devices will benefit many...
This paper presents a method for current controller design in a single phase grid-connected inverter (GCI). The proposed controller addresses the following items: transient performance; steady state tracking; output current distortions and dc; active damping; and start-up transient. The proposed controller is based on various extensions of the linear quadratic regulator (LQR) method and it inherits...
There is a large body of literature on modeling, design, and analysis of static-synchronous-series-compensator (SSSC) for voltage restoration and regulation. Most of them focus on investigating the impacts of source voltage disturbance only and give less emphasis on characterizing the whole system under load disturbances. This paper will derive a mathematical model to describe the static and dynamic...
A significant amount of green power is being installed at the distribution level through the installation of green power generation facilities in many parts of the United States and Canada. Green sources such as solar and wind are some of the green generation being interconnected at the distribution level. These non-conventional generators use inverter-based technologies and operate in parallel with...
This paper presents a study on the effect of increasing the inverter-based Distributed Generators (DGs) penetration in the dynamics and stability of a hybrid Microgrid. An analysis is also done to compare different inverter control techniques as a way to reduce voltage and frequency variations after a disturbance. The purpose of this study is to compare Microgrids with different percentage of inverter...
In AC servo system, the output voltage is restricted by inverter output limitations. Voltage saturation occurs as a result of this limitation. The settling time of current and speed increases because of voltage saturation. This paper proposes a new control system for improving the transient response of surface permanent magnet synchronous motor (SPMSM) by using the proposed flux-weakening control...
The aggressive scaling of semiconductor devices has caused a significant increase in the soft error rate caused by radiation hits. This has led to an increasing need for fault-tolerant techniques to maintain system reliability. Conventional radiation hardening techniques, typically used in safety-critical applications, are prohibitively expensive for non-safety-critical electronics. This work proposes...
Usually the top and bottom IGBT devices in an inverter leg are of the same make (i.e. from same manufacturer). At low power level, these two devices even may be contained in the same module. However at high power levels the top and bottom devices are in separate modules. Sometimes, in the event of device failure, device of particular make may be replaced by one of another make, but of same ratings...
This paper exploits the pulse quenching effect in order to reduce circuit error rates due to single event transients in combinational logic. Although the effect allows for substantial reduction in the sensitive area of a single cell, logical masking at circuit level has to be also considered. Our results show that pulse quenching has a limited effectiveness at circuit level. The results of the proposed...
A new control scheme to improve in dynamic response of parallel inverters is proposed in this paper. The conventional droop method is a good choice for managing microgrid in a decentralized manner. The proposed control technique, based on the droop control method, uses current feedback signal and Power Angle of VSIs. This method is usually applied to achieve good active and reactive power sharing...
The development of the internet of things provides the basis for monitoring systems used in the building structure monitoring area, and this makes it possible to collect data for the safety of different kinds of building structure. A series of intelligent services can be provided according to these data. This paper proposes a monitoring system for the safety of building structure based on semantic...
The LCL-filtered current controlled voltage source inverter (VSI) is commonly applied for integrating distributed generation into the utility grid. Due to the topology of the LCL filter, multi-loop control strategies using different feedback control variables have been developed to fulfill the goal of generating the desired active and reactive power by controlling the output current of the VSI. According...
This work proposes a novel built-in current sensor for detecting transient faults of short and long duration as well as multiple faults in combinational and sequential logic. Unlike prior similar strategies, which are formed by pairs of PMOS and NMOS sensors, the proposed scheme is a single sensor connected to PMOS and NMOS bulks of the monitored logic. In comparison with existing transient-fault...
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.