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Transcript
WIND ENERGY CONVERSION SYSTEM USING CASCADED
H-BRIDGE MULTI LEVEL INVERTER
ABSTRACT
In this paper cascaded H-bridge multilevel inverter operation is explained. Here
maximum power is extracted from a wind energy conversion system using permanent magnet
synchronous generator along with cascaded H bridge multi-level inverter. The copper losses in
the rotor are eliminated and higher efficiency is obtained by using permanent magnet
synchronous generator.
To overcome the limitations linked to maximum voltage a blocking capability of existing
power semiconductor devices, several new techniques and topologies have been developed, such
as diode-clamped inverter, Flying capacitor inverter, and cascaded H-bridge inverter . A number
of modulation techniques are used in multilevel inverters.
The design of a wind turbine system is to be done complicated task due to the parameters
involved and the often conflicting requirements, such as the low cost, ruggedness, good
output power quality and dynamic characteristics[2]-[4].To get variable speed operation, a power
electronics converter interface is used to connect the generator to the grid, which is shown in
fig.1.To overcome the limitations linked to maximum voltage a blocking capability of
existing power semiconductor devices, several new techniques and topologies have been
developed, such as diode-clamped inverter, Flying capacitor inverter, and cascaded H-bridge
inverter . A number of modulation techniques are used in multilevel inverters [11]. They can
generally be classified into three categories: Multi-step, staircase of fundamental frequency
switching;
Space Vector PWM (SVPWM);
Multi-carrier PWM.
This paper focuses on space vector PWM techniques which have been extended for use
in cascaded H-bridge multi-level inverter topologies. By using SVPWM method for cascaded H
bridge multi-level inverter. A five level cascaded H-bridge multilevel inverter circuit along with
PMSG based WECS is simulated using MATLAB. Modeling and simulation results of a PMSG
based variable speed wind energy system is analyzed in this paper.
Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad
www.kresttechnology.com, E-Mail : [email protected] , Ph: 9885112363 / 040 44433434
1
BLOCK DIAGRAM FOR PROPOSED SYSTEM
DESIGNG SOFTWARE AND TOOLS:
MAT LAB /SIMULATION Software and sim power systems tools are used. Mainly control
system tools, power electronics and electrical elements tools are used.
Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad
www.kresttechnology.com, E-Mail : [email protected] , Ph: 9885112363 / 040 44433434
2