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This paper deals with the estimation problem in three-phase, three-level neutral point clamped (NPC) converter via nonlinear observer. An observer based on adaptive backstepping approach is used for capacitor voltages estimation. It is assumed that capacitance value of the DC-link capacitors are unknown.
The operation and control of fuel cell (FC) distributed generation (DG) systems combined with energy storage are studied in this paper. For this purpose, modeling of hybrid FC/energy storage DG system is developed. Dynamic models for proton exchange membrane fuel cell (PEMFC), supercapacitor, DC–DC converters, and grid connected inverter are described. Then a PI controller for the FC converter (boost)...
This paper describes new controller architecture to enhance an Interior Permanent Magnet Synchronous Motor (IPMSM) drive robust to current sensor failure. In order to increase the reliability which is crucial topic in industrial applications a virtual sensor (nonlinear observer) and a voting algorithm are combined with the actual sensors to create fault tolerant controller. It is assumed that stator...
This paper presents variable voltage variable frequency (VVVF) control scheme to tubular linear permanent magnet synchronous machine (TLPMSM) with gas springs. To achieve constant drilling speed in the presence of different magnitudes of hardness of rocks, it is necessary to change the input voltage to the machine. Therefore, with change in input voltage, the natural frequency of the spring system...
Tubular linear permanent magnet machine with gas springs using for drilling applications is presented. This machine has the advantage of directly transmitting electric power to rock without gears. In this paper, mathematical model with hammering effect is established and dynamic process of oscillatory motion is analyzed. Simulation results show that this machine is suitable for drilling application.
This paper concentrates on the control of hybrid fuel cell/energy storage distributed generation systems under voltage sag in distribution systems. The proposed control strategy makes hybrid distributed generation system works properly when a voltage disturbance occurs in distribution system and it stays connected to the main grid. To distribute the power between dc power sources and stabilize the...
This paper presents a method for power loss analysis applied on single-phase grid-connected PV inverter. The often neglected current ripple effects are included in power device switching and conduction losses. The relationships amongst component losses, output inductance, switching frequency and dc-link voltage are investigated. It is shown that current ripple effect is important to power loss analysis...
This paper presents control strategy of hybrid fuel cell distributed generation system (HDGS) during voltage sag in distribution systems. The proposed control strategy is based on fuzzy logic and allows the hybrid distributed generation system to operate properly during the voltage sags in distribution systems. For tuning the parameters of fuzzy logic controller, the PSO (particle swarm optimization)...
Tubular linear permanent magnet motor with gas springs using for drilling applications is presented in this paper. This motor has the advantage of directly transmitting electric power to rock without gears. Mathematical model with hammering effect is established and dynamic process of oscillatory motion is analyzed. Dynamic response comparison of no load mode and load mode is done. Simulation results...
Traditional tuning techniques like modulus optimum or symmetrical optimum can be applied to the design of control loops for many power electronic applications. When directly implemented in digital control systems, this will lead to reduced stability margins since the sampling effects are not taken into account for the controller design. This paper is investigating a method for obtaining discrete time...
Single dwelling solar lighting systems fulfill the much-needed gaps in rural applications in less developed geographies. Many of these systems are designed to meet challenging cost objectives, but fail to consider the reliability and availability aspects. In this paper, a simple modification to the battery charging circuit for these applications is proposed that will increase the battery life and...
Circuits for synchronizing power converters to the three-phase utility voltages are often sensitive to voltage disturbances. Some kind of filtering device is needed. Voltage information is also important for system protection. Both voltage and frequency disturbances could be disadvantageous for the equipment. In this paper an alternative solution for improving the performance of a synchronizing circuit...
This paper presents several methods for active damping of resonance oscillations in LCL-filters. All the methods are implemented using only estimated values of the capacitor voltages and currents. The sensorless control strategy used in this paper is based on the virtual flux concept and all voltages and currents with the exception of the dc bus voltage and the converter output currents are derived...
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