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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...
In this paper, a novel method for the digital implementation of one-cycle controller (OCC) is introduced for the control of AC-DC full-bridge converter. The use of this technique eliminates the need of high sampling rates for data acquisition or of using averaged input parameters for control, which is usually the case for digital implementation of OCC. Since, the instantaneous result of integration...
Modular Multilevel Converters(MMCs) are considered to be state-of-the-art power converters for high voltage applications. MMCs typically consist of a stack of capacitor-switch assemblies (known as sub-modules), and requires voltage balancing control of multiple floating capacitors. To make these control decisions accurate, it is necessary to have precise knowledge about voltages across each of these...
Variable flux machines use low coercive-force magnets to control the air-gap flux density. The magnet flux is controlled by applying direct-axis armature current pulses. The magnetization state of the magnets depends on the peak value of the direct-axis current. Any overshoot in the direct-axis current adversely affects the magnetization state. As the controller parameters are dependent on the inductance...
Rapid progress in the Electronics Industry, and the need for more efficient energy conversion techniques, has necessitated the quest for alternate materials for power semiconductor devices, as Silicon (Si) is reaching its performance limits. The recently developed Gallium Nitride (GaN) power devices, promises to deliver high-frequency switching, high power density converters having better performance...
A novel current controller for constant current injection based characterization of switched reluctance machine (SRM) is proposed here. Unlike conventional characterization methods, where the rotor is locked at a fixed position, the current injection based method maintains the phase current constant while the machine is run at constant speed. The proposed constant current injection scheme yields the...
Multi-phase self excited induction generators (SEIGs) are increasingly being considered for standalone renewable energy generation due to better fault tolerance and ruggedness offered by them compared to the poly-phase counterparts. This paper presents modeling and analysis of a self voltage regulating, short shunt six-phase SEIG (6Ph-SEIG) supplying RL load. Mathematical model of the 6Ph-SEIG is...
This paper presents torque-angle characterization of a Synchronous Reluctance Machine (SynRM). Advancement in power electronics and machine design have allowed these motors to be used in various industrial and traction drive applications. An appropriate torque-angle characterization can reduce the size of the converter and provide an optimal operation of the machine. It also gives insight about the...
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