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Advancement of Variable Speed Drive (VSD) technology possesses energy efficient dynamic control. As well as, the doubly fed asynchronous machine based VSD suits for different variable speed applications due to its effective controllability with partial rated power converters. To improve the performance of the doubly fed system in the aspect of cost effective energy saving, a fuzzy logic controller...
Electric motors consume around 30 to 80% of total energy in industries. Part load operation of which leads to lower efficiency. To improve efficiency and conserve energy under such partial load operating conditions, a novel switching strategy is proposed. Wherein, the stator and rotor windings are alternatively energized (switched) in accordance with the varying load. Adopting this technique with...
Energy conservation is a crucial criterion in any industry. Generally, the process industry employs induction motors for its robustness and reliability. Engaging star-delta scheme based energy conservation for induction motors is a conventional practice in process industries. Although the star delta scheme provides economic benefits, it affects the outgrowth of the industries during electrical perturbations...
Functioning the hydroelectric pumped storage power plant in condenser regime for network stabilization is a common practice. During this operation, hydroelectric machines (doubly fed synchronous machine and doubly fed asynchronous machine) are influenced by various power quality perturbations causing failure to the system. This paper investigates the electro-thermomechanical effects on hydroelectric...
Enhancing the reliability of pumped storage hydroelectric system is mandatory for building the stable network. This paper experimentally analyses the electrical and mechanical effects of voltage unbalance on doubly fed synchronous (fixed speed) machine and doubly fed asynchronous (variable speed) machine operating under motoring mode. The input electrical quantities such as stator current, rotor current,...
Electric propulsion system integrated with doubly-fed asynchronous motor contributes efficient characteristics and flexibility in operation. However, in perception of energy saving and full-scale speed variation, the conventional doubly fed asynchronous motor is limited by the ratings of power converters. Generally, the electrical machines are designed to attain maximum efficiency around the full...
Pumped storage hydro power plant with doubly fed asynchronous machine offers impressive features and provide flexibility in operation. In pumped storage power plant, the starting method of doubly fed asynchronous machine is similar to the conventional asynchronous machine, where a substantial amount of energy is wasted. This paper proposes an effective energy loss reduction technique to the doubly...
Enhancement of cost effective energy conservation technology plays a vital role in process industries. Hence acquiring star-delta based energy conservation scheme for induction motors is common in industries. But the impact of transient and vibration during switchover are the main hindrance of the star-delta based energy conservation scheme. Thus, analyzing the effect of transient and vibration is...
Development of decentralized power generation for rural electrification has improved by the concept of micro hydropower plants. Generally in isolated areas self-excited synchronous or asynchronous generators are used and it had be continually haunted by voltage and frequency regulation issues due to the variation of consumer loads. Employing electronic load controller in the system regulates the generator...
Hydropower is a major energy source among the renewable energy sources. According to “BP Statistical Review of World Energy, June 2013”, 16.34 percentage of global power generation acquire from hydropower. To attain efficient generation in hydro plant, extensive design with the up to date technology is mandatory. To make the generation more effective various technologies are adopted, among these the...
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