Boost Inverter for Standalone Power applications
Overview
Importance of SIne wave Boost Inverter for standalone power applications.
Overview
Boost Inverter: Challenges & Best practices
Introduction
With fast depletion of exhaustible energy and need for cleaner energy drives the use for solar energy. In rural areas where grid connected power supply is scarcely available, non grid connected solar power acts as a boon.
Primary problem with standalone power systems involve voltage and frequency variation with change in load which can be solved through a closed loop inverter design.
In closed loop configuration the load voltage is sensed and fed back to the Sinewave inverter circuit. The sine wave output therby generated is much better for use in common household electrical apparatus.
Detailed overview
Inverters are used to convert DC to AC power. Traditional inverters have drawbacks with repect to power quality and efficiency. These isuues predominantly come from the fact that they all use square wave for DC to AC power conversion.The above problems can be solved with employing Sine wave Boost Inverters with harmonic cacellation using closed loop Microcontroller Based Design. The firing required for the inverter controlled through SPWM technique with feedback from load current.Total harmonic distortion(THD) less than 1% was achieved.
Best Practices
This sectioin will present best practices for generation of Sine wave Boost Inverter with Minimal THD.
Feedback is necessary in standalone systems as voltage and frequency varies with load.
Three types of feedback mechanisms possible.
1. Simple Current controlled feedback
2. Hysteresis current controlled feedback
3. Voltage controlled feedback.
Conclusion
Sine wave inverters are the best solutions for standalone power applications as they provide the best power output for household apparatus. If square wave inverters are used most motor controlled apparatus age faster due to degradation of Inductors used. So SIne wave inverters are the most viable way forward.