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DC power supply mode is used for high power fast charging of electric vehicles, the voltage ripple generated by rectifier of preceding stage causes overvoltage and overcurrent in the battery, which can reduce the battery life, the operation stability of post-stage DC-DC chopper is also reduced, so the quality of charging is affected. Hence it is important to restrict voltage ripple generated by rectifier...
During the control process of the three-phase PWM rectifier, the parameters of the conventional PID controller are kept constant. It's unable to make appropriate changes according to the actual working condition of the rectifier and the change of working environment, which limits the adaptability of the rectifier to environment and working conditions. Against this point, the single neuron adaptive...
The grid connected photovoltaic (PV) system have been modeled and simulated using control algorithm with dedicated PI control for dc link voltage regulation. Generally, the PI controller used for the system is tuned using trial and error method but this method is having manual limitation for the tuning of controller so as to obtain the desired response like as regulating dc link voltage to reference...
In order to quicken the dynamic response and strengthen the ability against the disturbance of nonlinear load, three-phase voltage source PWM rectifier widely employs dual loop PI control scheme which consists of inner current controller and external voltage controller. The parameters of dual loop PI regulators have significant influence on the dc-link voltage, AC harmonic components and power factor...
This paper presents a new pulse width modulator dedicated basically for under determined systems. The solution of the under determined problem is performed by minimum 1-inflnity norm solution. One of known under determined system is a four-leg three-phase converter because four reference signals must be created from three control commands. The infinity norm enables to find proper solution to generate...
This paper investigates a novel control strategy of three-phase voltage source PWM rectifier (VSR) system with the combination of proportional-integral (PI) control method and sliding mode control method. To have satisfactory performances, the condition of uncertain disturbances and loads disturbances should be taken into consideration when designing the controllers. The whole double closed loops...
In this paper, comparative study of three algorithms of digital PI control, that is, conventional PI control, offset control and modified PI control, is presented. Conventional PI control is subjected to numerical error because the gain must be small in order to move zero of the control to output transfer function to low frequency. To prevent this undesired issue, authors have already proposed novel...
Power conditioning system (PCS) is an interface between distributed generation and utility grid. It regulates voltage, current and power transmitted from the hybrid direct fuel-cell/turbine (DFC/T) power plant to utility grid. This paper presents a self-adaptive fuzzy PI controller of three phase inverter in PCS for the DFC/T power plant. One of the main tasks of PCS for distributed generations is...
This paper presents a high-performance design of dc-dc switching power converter system, which can deliver a regulated 0–50V and 0–15A output. The full-bridge phase-shift converter is realized with zero voltage switching and UCC3895 IC to achieve higher efficiency and pulse width modulation. For wide range of adjustable voltage output control, a PI gain-scheduling control scheme is proposed and implemented...
Proposed a three-phase voltage PWM rectifiers control plan based on the sliding mode variable structure control theory. After simulate confirmation we can see that the sliding mode variable structure control system has a good robustness and good dynamic performance. At the same time established the three-phase voltage PWM rectifiers control system based on PI algorithm. After simulate confirmation...
Plug-in hybrid electric vehicles (PHEVs) are equipped with a high energy density battery pack, which should be externally charged form the grid. This requires a high power battery charger circuit which can operate at universal input voltage and be capable of maintaining the required output voltage and current with low ripple. The topology composed of PWM boost rectifier cascaded with a bidirectional...
This paper presents the design of simple but powerful soft switching scheme for a DC-DC Boost Converter with a closed loop control. A new novel soft switching scheme is proposed with a single switch and minimum components which offers load independent operations. Here only one switch is used in this converter which is switched ON at zero current and switched OFF at zero voltage. The proposed Controller...
Distributed resources are finding increased penetration in developing countries like India. The increased acceptance of such resources is mainly due to their modularity, increased reliability, good power quality and environment friendly operation. These are currently being interfaced to the existing systems using voltage source inverters (VSC's). The control of such distributed resources is significantly...
Poor voltage and frequency regulation under source and load perturbations limit the use of self excited induction generator (SEIG) in isolated and dispersed generation, which can exploit wind/microhydro type renewable energy sources. In the present work, a Generalized Impedance Controller (GIC), which is a pulse-width-modulated voltage-source-inverter with a dc-link battery, is used to regulate both,...
Presently work exists within the IEEE to develop a test standard for Permanent Magnet AC (PMAC) machines that includes a specification on the quality of current supplied to the machine. The research presented in this paper offers a comparison on the quality of current provided to the machine for three control strategies; Space Vector, PI and Bang-Bang. The tests conducted were of an “on the fly” nature...
A novel power converter for battery used in the Plug-in Hybrid Electric Vehicle (PHEV) is proposed, which could charge and discharge the battery effectively. The system is composed of two parts: a three phase full bridge PWM rectifier and a DC/DC converter. The PWM rectifier is utilized to rectify the three phase AC to DC voltage, which should be higher than the battery terminal voltage. The DC/DC...
PWM rectifier technology is introduced to the main Power Circuit of the charger for aircraft battery to enhance the charging efficiency of aircraft battery and improve its long term reliability and save its life in this paper. A new strategy of DPC Based on the Space Vector Modulation (SVM) is used in PWM rectifier, Meanwhile, a fuzzy PI controller is designed in DC voltage control loop. The simulation...
The design of the voltage loop and current loop of three-phase high power factor PWM rectifier was introduced, the strategy of dual-mode control that combine fuzzy control to PI regulator is proposed, which use fuzzy controller to obtain quick dynamic response when deviation is in small range and adopt PI regulator to realize no static error when deviation is in long range, improving the control accuracy...
In this paper, a thermal dilatory system is suggested, which can simulate the thermal process of a sample system with electrical circuits and LABVIEW software. In a real system, we can expect to have a combination of a linear equation and one delay. It's needed to be mentioned that we can use a combination of delay and linear equation to model a higher degree system. In this paper, this model will...
Voltage sag is one of the major power quality problem which results in a failure or a mis-operation of end use equipments. Sensitive industrial loads and Utility distribution networks all suffer from various types of outages and service interruptions which can cost significant financial loss per incident. The aim therefore, is to recommend measures that can improve voltage sag. In this paper a method...
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