31-08-2013, 04:42 PM
Design of microturbine generator by using matlab Simulink for smart grid
Design of microturbine .docx (Size: 277.97 KB / Downloads: 23)
Abstract
This paper presents modelling simulation and analyses of load following behaviour of micro turbine as distribution energy resource have been performed. The system comprises as a Micro turbine interconnected to the utility grid. The micro turbine generation is predicated to play an important role in the electric power system in the near future. It is widely accepted that micro turbine generation are currently attracting lot of attention to meet user needed in the distributed generation market. the model consist of speed control, acceleration control and temperature control .the system comprise to the permanent magnet synchronous machine (PMSG) and coupled to the micro turbine This work considers that the MT supplies power to variable and critical loads. The model also used a speed controller to maintain the MT speed constant as the load varies.
Introduction
The deregulation of electric power utilities, advancement in technology, environmental concerns and emerging power markets are leading to increased interconnection of distributed generators to the distribution networks. Besides offering environmental benefits, integration of modular generating units to distribution network may bring other significant benefits such as increased reliability, loss reduction, load management and also the possibility of delaying the adjustment of transmission and distribution networks [1]. Various new types of distributed generator systems, such as microturbines and fuel cells in addition to the more traditional solar and wind power are creating significant new opportunities for the integration of diverse DG systems to the utility.
Microturbine system modeling
There are essentially two types of micro turbine designs. One is a high-speed single-shaft design with the compressor and turbine mounted on the same shaft as the permanent magnet synchronous generator. The generator generates a very high frequency three phase signal ranging from 1500 to 4000 Hz. The high frequency voltage is first rectified and then inverted to a normal 50 or 60 Hz voltage. Another is a split shaft design that uses a power turbine rotating at 3600 rpm and a conventional
Permanent Magnet Synchronous Machine
The model adopted for the generator is a 2 pole permanent magnet synchronous machine (PMSG) with non salient rotor the machine output is 30kw and is terminal line voltage is 480v the electrical an mechanical parts of the machine are each represented by the second order state space model. The model assumes that flux established by the PMSG in the stator is sinusoidal. The development of advanced magnetic materials, power electronics and digital control systems are making permanent magnet (PM) machine as an interesting solution for a wide range of applications. The advantages of PMSM compared to other AC machines are its simple structure, high-energy efficiency, reliable operation, high power density and Possibility of super high speed operation. Recent important applications of permanent magnet synchronous machine are in the area of distributed generation, mainly in wind and 192 Distributed Generation microturbine generation systems. An advantage of a high speed generator is that the size of the machine decreases almost in directly proportion to the increase in speed, leading to a very small unit. Super high speed PMSM is an important component of single shaft MTG system. The mathematical model of a PMSM is similar to that of the wound rotor synchronous machine.