SYSTEMBALANCE
Figure 2. IGBT’s Gate Driver Block Diagram
44
devices is usually controlled by a DSP embedded controller via a fibre optic link, to provide efficient and reliable switching control with high galvanic isolation capability.
Examples of power semiconductor devices available in the market are:
Insulated Gate Bipolar Transistor (IGBT) Gate Turn Off Thyristor (GTO) Integrated Gate Commutated Thyristor (IGCT) Symmetrical Gate Commutated Thyristor (SGCT)
Emitter Turn Off Thyristor (ETO)
Fibre optic components are commonly used to control a high voltage and current switching device, with reliable control and feedback signals (Figure 2). The reason for this is fibre optic’s capacity to carry a large amount of electrical energy with limited voltage loss. Fibre optic avoids many of the pitfalls of convential wiring options.
Avago’s Versatile Link product family (HFBR-0500Z series) has been the most popular standard component for power semiconductor control board. Its simple transmitter driving circuitry and receiver circuitry make these components easily integrated into the system with TTL logic level. Figure 3 shows the common interface circuitry for 5MBd data rate operation.
Figure 3. HFBR-1521Z/2521Z Circuit Diagram for 5MBd Data Rate
Controlling and Monitoring System
There are 2 main ways to get the maximum electricity power from solar energy, one is to use the most efficient solar panel and another way is to track the sun’s movement through out the day. It has been shown that solar panel with tracking system shows higher electricity output as compared to the fixed system [1, 2].
As commercial solar farms are getting larger nowadays to generate more power for utility, there are needs to have intelligent features to monitor the performance of each solar panel, for example electricity output and temperature. It also has to control the angle and direction of the solar panels to get the maximum electricity output.
Figure 4. Controlling and Monitoring System over Fibre Optic within Solar Farm
In the commercial solar farm that generates few megawatts power, the solar panels are installed in huge area, where reliable controlling and
www.solar-pv-management.com Issue III 2010
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