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Application Report
SPRAAE3 – May 2006
TMS320C2000™ DSP Controllers: A Perfect Fit for Solar
Power Inverters
Emmanuel Sambuis and Sangmin Chon
....
C2000 European Marketing Manager and C2000 Technical Marketer
ABSTRACT
A worldwide concern for future access to affordable, sustainable energy is driving the
development of more efficient solar power generation. In any photovoltaic (PV) based
system, the inverter is a critical component responsible for the control of electricity flow
between the module, battery, loads, and power grid. Inverters, which convert direct to
alternating current, can be designed to be used with different voltage ranges and
topologies for varying applications. They can also be designed with or without
transformers. Besides DC/AC conversion, inverters provide additional functions such as
maximizing power, battery charging, and protecting the circuit. All of these functions
require optimized intelligent control that can occur in real time or near-real time. The
wide variations in application and operational requirements mean that the system
control has to be highly flexible. Digital signal processor (DSP) based controllers, such
as the Texas Instruments TMS320C2000™ family of controllers, provide the high level
of computational performance and programming flexibility needed for the real-time
signal processing in solar power inverters. Highly integrated digital signal controllers
help inverter manufacturers create more efficient, more cost-effective products that can
support the growing demand for solar energy in upcoming years.
development of more efficient solar power generation. In any photovoltaic (PV) based
system, the inverter is a critical component responsible for the control of electricity flow
between the module, battery, loads, and power grid. Inverters, which convert direct to
alternating current, can be designed to be used with different voltage ranges and
topologies for varying applications. They can also be designed with or without
transformers. Besides DC/AC conversion, inverters provide additional functions such as
maximizing power, battery charging, and protecting the circuit. All of these functions
require optimized intelligent control that can occur in real time or near-real time. The
wide variations in application and operational requirements mean that the system
control has to be highly flexible. Digital signal processor (DSP) based controllers, such
as the Texas Instruments TMS320C2000™ family of controllers, provide the high level
of computational performance and programming flexibility needed for the real-time
signal processing in solar power inverters. Highly integrated digital signal controllers
help inverter manufacturers create more efficient, more cost-effective products that can
support the growing demand for solar energy in upcoming years.
Contents
1
The Need for Solar-generated Power
2
The Role of the Inverter
3
Obtaining Maximum Charging Power
4
Digital Signal Controllers
5
A Key to Solar Power
6
Reference
List of Figures
1
PV and Generator Hybrid System
2
Modular Inverters Serving Multiple PV Panel Strings
3
Transformerless DC/AC Conversion Circuit
4
Equivalent Circuit with Transformer
5
MPP for Different Conditions
6
TMS320F2808 Architecture
7
Design Example - Multichannel Buck Converter
TMS320C2000, TMS320F28x are trademarks of Texas Instruments.
SPRAAE3 – May 2006
TMS320C2000™ DSP Controllers: A Perfect Fit for Solar Power Inverters
1