Theory of the adjustable speed generation systems

Abstract

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).

Variable Speed Diesel Electric Generators: Technologies, Benefits, Limitations, Impact on Greenhouse Gases Emissions and Fuel Efficiency

“…Many studies propose different control strategies for these generator sets to improve the system's efficiency [53][54][55][56][57][58][59][60][61][62][63][64]. In these studies, the power flow extracted from the engine through the generator is controlled by the electronic power converter.…”

“…Despite this characteristic, VSDG technologies that use power converters are the most widespread solutions today. They are present in applications connected to the grid [48,49] or isolated regions [46,[52][53][54][55][56][57][58][59][60][61][62]. These technologies are widely studied, and many projects develop control strategies to ensure the best efficiency of these systems, with the lowest fuel consumption.…”

Island operation of a three-phase adjustable speed generation system

“…An adjustable speed generation system (ASGS), in comparison with a fixed speed generation system (FSGS), provides lower fuel consumption and reduces weight and size of the generation system . The ASGS converts variable frequency and amplitude of a permanent magnet generator (PMG) voltage to a fixed direct current (DC) or alternating current (AC) voltage.…”

Conducted Electromagnetic Interference (EMI) in Smart Grids

“…In order to achieve the assumed high level of renewable energy content the application of advanced metering and control techniques (grid automatic enabling island operation contributes to increased reliability), energy storage devices, and demand management techniques e.g. active demand response (ADR) are required [6,16,18,19,25,31,43,54,55,67,68,72,73,75,82,112]. • A typical feature of this system is the high quality of electric energy, elimination of higher range harmonics, voltage dips, sags, interruptions, and asymmetry of phase voltages.…”