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Distributed generation systems are acquiring day by day bigger relevance regarding the conventional ones due to the energy requirements and to the use of sources of ecological and renewable energy. Regarding the energies, one of the most developed is the wind energy, which in many cases uses generating machines of the asynchronous type with multiple excitation feeding. The study was carried out on...
The use of slip-ring induction machines for isolated distributed generation is investigated. By varying the effective rotor resistance of a self-excited slip-ring induction generator (SESRIG), the magnitude and frequency of the output voltage can be controlled under variable-speed operation. Analysis of a SESRIG supplying isolated single-phase loads is presented. Practical implementation using a chopper-controlled...
The wind power generation technology has evolved significantly in the past few years with the demand for distributed, renewable energy growing. The doubly-fed induction generator (DFIG) is one of the most attractive solutions among many energy conversion devices for wind energy. The doubly-fed induction generator with a back-to-back four-quadrant ac-dc-ac power converter between the rotor side and...
Special features of ultrahigh-speed induction generators are analyzed, that are applied in a system developed to generate electric energy by utilizing renewable and waste energy resources. The solution is based on a system that consists of a high-speed turbine, coupled to a three-phase induction generator, an AC/AC converter and a supervisory control unit. The function of the system is to utilize...
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