University of South Wales Master of Sciences Thesis

Fig. 2.28 Synchronous generator power electronics topology

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Standalone Hybrid Power Generation Syste

Fig. 2.30 Control block diagram of PWM converter with PMSG

Fig. 2.28 Synchronous generator power electronics topology

The most generalized form of power electronics topology for the wind energy application is the back-
to-back rectifier/inverter connection, which provides the improved power flow control as well as
increased efficiency. The voltage-fed converter scheme used in such systems is shown in Figure 18. A
PWM-based IGBT bridge rectifies the variable-frequency variable-voltage power from the wind
generator. The rectifier also supplies the excitation needs for the induction generator. The inverter
topology is identical to that of the rectifier, and it supplies the generated power at 50 Hz to the utility
grid (Simoes and Farret 2004).

Standalone hybrid generation system for the remote area of Thar, Pakistan

Fig. 2.29 Generalized power electronics converter for wind systems

This general structure is suitable for any type of wind energy systems. For the PM synchronous
generator, as discussed in Figure 16, the rectifier and boost converter can be replaced by the PWM
rectifier to achieve the same level of control. Based on the control design for the back-to-back PWM
converter system, various advantages can be obtained such as (Simoes and Farret 2004):
•
The line-side power factor is unity with no harmonic current injection (satisfies IEEE 519).
•
Wind generator output current is sinusoidal.
•
There are no harmonic copper losses.
•
Continuous power generation from zero to the highest turbine speed is possible.
•
Islanded operation of the system is possible with a start-up capacitor charging the
battery.
Fig. 2.30 Control block diagram of PWM converter with PMSG

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