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.
In this paper a modification to dual comparison one cycle control is proposed which enables bi-directional power flow in single phase grid connected converters. Advantages of dual comparison one cycle control when compared to conventional one cycle control is that it does not give any steady state dc offset, no light load instability and unipolar pwm without having to sense the grid voltage. Modification...
This paper discusses the different aspects of the interconnected operation of DC microgrid. Each source in a microgrid uses a proportional controller to eliminate the limitations of droop control. Effect of interconnecting line inductance and resistance on system stability is investigated using root locus plot. The sensitivity of different modes to the states of the system is analyzed using participation...
This paper provides importance of stationary VRLA battery health measurement system in critical energy storage applications. Factors affecting battery health and role of battery internal resistance on capacity loss are detailed. A comparison of different test methods used for health estimation in present industry is tabulated. Resistance estimation by dc method and ac methods are simulated and tested...
The phase modulated full bridge resonant transition converters are widely used for high gain, high power applications. For such applications, the difference in the output voltage predicted from the lossless DC gain model and the actual output voltage is significant. Hence the DC gain loss model for this converters is proposed and analyzed in this paper. The six intervals of operation of the converter...
This paper presents a methodical approach for the development of sliding mode controlled audio amplifier suitable for mid power audio applications. Various design aspects which includes the practical problem will be addressed with the appropriate solution. An easy to follow design strategy to build a 20W, 20Hz to 20kHz audio amplifier is described. Experimental result of the prototype with a 4Ω loudspeaker...
In this paper, a Square root Cubature Kalman filter (SCKF) is applied for speed and position estimation in the control of Interior Permanent Magnet Synchronous Motor (IPMSM). Cubature Kalman filter avoids the linearization errors prevailing in the Extended Kalman filter algorithm, and is much easier to tune than the Unscented Kalman filter. The square root version of the Cubature Kalman filter gives...
A modeling approach for the electrochemical batteries, which is suitable for in-circuit parameter extraction is presented. The charge flow in an electrode reaction is governed by the mass transport regime within the cells. For sufficiently higher charge flow rates, the mass transport rate decides the limit. Hence modeling the battery, centered around the mass transport mechanism can have the benefits...
This paper deals with a finite-element method based design of a liquid-rheostat reduced-voltage starter for three phase squirrel-cage induction motors which typically drive irrigation pump loads.
DC microgrid is becoming popular due to high efficiency, reliability and easy integration of renewable sources. Droop controller based distributed technique is used in dc microgrid for proportional power sharing among sources. However, due to interconnecting cable impedance, trade-off exists between power sharing accuracy and voltage regulation. Centralized controller achieves these objectives using...
One of the major challenges faced in the design of DC shipboard power systems (SPS) is the provision of effective DC protection. The selection of the current sensors plays an important role in the detection of fault current in DC systems. The Rogowski coil has emerged as a popular choice of current sensor for use in DC SPS protection system primarily because of its fast response and non-saturable...
This paper presents a method for online rotor flux linkage estimation for a variable flux interior permanent magnet synchronous machine (VF-IPMSM) drive system at different flux density levels. Since the stator winding resistance is temperature dependent, a thermocouple was used to obtain the actual stator winding temperature for accurate stator winding resistance measurement which was used for precise...
an optimal driving region (ODR) of electric vehicle (EV) is determined here for changing a speed during acceleration. The ODR which is restricted by two extreme driving points comprises multiple driving strategies (acceleration(s) and the corresponding acceleration duration). ODR was decided by solving an optimization problem that includes three conflicting objectives, minimizing total acceleration...
This work presents a novel urban transportation system based on supercapacitor driven electric vehicle. These electric vehicles will be charged at the bus stops located at a distance of 1–2 kilometres from each other. The bus stops have a large capacity flow batteries that are charged during off-peak hours of the grid. This reduces the stress on the grid during peak hours and drives the transportation...
Phase Shifted Full Bridge (PSFB) converters are widely accepted for high and medium power DC-DC conversion. These converters have features such as ZVS operation and reduced EMI operations, which leads to higher efficiency. In the traditional power loss calculation methods, only the fundamental component of switching frequency is considered. This paper describes more detailed power loss analysis of...
This paper deals with the investigation of the Extended Kalman Filter (EKF) for sensorless indirect vector control of an induction motor. The prime focus is low speed operation, when the EKF somewhat presents erroneous results. The effectiveness of the EKF as a speed estimator under machine parameter variations - change in stator resistance, rotor resistance is assessed. Furthermore, the effect of...
This paper presents a Resonant Converter with high frequency transformer(HF) magnetizing inductance (Lm) considered as shunt inductance. The resonant network comprises of series branch (Ls&Cs) and shunt branch (Lp&Cp). Shunt branch inductance (Lp) of resonant converter is used as magnetizing inductance of HF transformer. HF transformer is designed in such a way that Lm is equal to Lp which...
Low voltage distribution feeders have many imperfections. Their theoretical models give results far from actual values because of ignoring many extraneous factors. Small PV plants have a major share among renewable energy based Distributed Generators. They are interconnected with grid at Low Voltage (LV) distribution level which may adversely affect the voltage profile and phase balancing. Proper...
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.