Microgrids and their operations
Fedorov, Filipp (2007)
Diplomityö
Fedorov, Filipp
2007
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe20071245
https://urn.fi/URN:NBN:fi-fe20071245
Tiivistelmä
Interconnection of loads and small size generation forms a new type of distribution
systems, the Microgrid. The microgrids can be operated together with the utility grid
or be operated autonomously in an island. Thesesmall grids present a new paradigm
of the construction of the low voltage distribution systems. The microgrids in the
distribution systems can become small, controllable units, which immediately react
to the system's changes. Along with that the microgrids can realize the special
properties, such as increasing the reliability, reducing losses, voltage sag correction,
uninterruptible supplying.
The goals of the thesis are to explain the principles of the microgrid's functioning, to
clarify the main ideas and positive features of the microgrids, to find out and prove
their advantages and explain why they are so popular nowadays all over the world.
The practical aims of the thesis are to construct and build a test setup of a microgrid
based on two inverters from SMA Technologie AG in the laboratory and to test all
the main modes and parameters of the microgrid's operating. Also the purpose of the
thesis is to test the main component of the microgrid - the battery inverter which
controls allthe processes and energy flows inside a microgrid and communicates
with the main grid. Based on received data the main contribution of the thesis consists of the estimation
of the established microgrid from the reliability, economy and simplicity of
operating points of view and evaluation ofthe advisability of its use in different
conditions. Moreover, the thesis assumes to give the recommendations and advice
for the future investigations of the built system.
systems, the Microgrid. The microgrids can be operated together with the utility grid
or be operated autonomously in an island. Thesesmall grids present a new paradigm
of the construction of the low voltage distribution systems. The microgrids in the
distribution systems can become small, controllable units, which immediately react
to the system's changes. Along with that the microgrids can realize the special
properties, such as increasing the reliability, reducing losses, voltage sag correction,
uninterruptible supplying.
The goals of the thesis are to explain the principles of the microgrid's functioning, to
clarify the main ideas and positive features of the microgrids, to find out and prove
their advantages and explain why they are so popular nowadays all over the world.
The practical aims of the thesis are to construct and build a test setup of a microgrid
based on two inverters from SMA Technologie AG in the laboratory and to test all
the main modes and parameters of the microgrid's operating. Also the purpose of the
thesis is to test the main component of the microgrid - the battery inverter which
controls allthe processes and energy flows inside a microgrid and communicates
with the main grid. Based on received data the main contribution of the thesis consists of the estimation
of the established microgrid from the reliability, economy and simplicity of
operating points of view and evaluation ofthe advisability of its use in different
conditions. Moreover, the thesis assumes to give the recommendations and advice
for the future investigations of the built system.