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Absfract-This paper is focused on the performance of a novel type of adjustable speed power generating set.The set consists of a diesel engine, an axial type permanent magnet generator and ACIAC converter. The engine is designed to operate over a wide speed range powering a high efficiency permanent magnet generator. The generator output is fed to a power electronics controller designed to maintain the voltage and frequency to the requirement of the load. The power to weight ratio of the set is considerably more than conventional set incorporating a wound field generator and RIC engine running a t 1500/1800 rpm. The axial flux generator used is light, short and higher in eficiency than conventional type. The unique feature of the system is the control algorithm, which ensures fast system response and accurately map the engine torque curve to load demand. The paper will present the concept and main features of the recently developed Variable Speed-Integrated Generating set.

PurposeThe purpose of this paper is to provide a new theory of adjustable speed decoupled generation which has the potential to challenge existing coupled generation based on a classical synchronous generator operating with fixed speed.Design/methodology/approachThe paper's approach is a theoretical consideration of the drawbacks of conventional fixed speed generation based on a synchronous generator and proposal of problem solutions by the introduction of a decoupled generation system with additional degree of freedom. Computer calculations are used as design and for preliminary verification. Tests in a real laboratory system equipped with modern components such as electrical machines and power electronic converters proved the theory.FindingsDecoupled generation is realized in a very original way using new blocks, integration method and control. The developed system has been awarded more than six world patents. The system has additional degrees of freedom in speed and grid connection operation.Originality/valueThe research team has concentrated its research over many years and developed a generation system which has been awarded a great number of patents. A special axial flux, light and simple permanent magnet generator was developed and integrated to the prime mover. A three‐phase AC/AC power electronic converter and a DSP controller are integrated to a very small size and low weight. The invented topology provides a very reliable operation, high‐quality AC voltage in fully three‐phase non‐symmetrical load. There were also presentations on world conferences (EPE, PESC, EPE‐PEMC).

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