Microcontrooler based design an implementation of parallel inverters

Project Title

Microcontrooler based design an implementation of parallel inverters

Project Area of Specialization RoboticsProject Summary

Modern world is moving towards the use of renewable energy resources since non-renewable resources are being depleted day by day. Following the trend, modern electrical systems also uses renewable(Solar& Wind) energy. This helps to lessen the greenhouse gas emissions. The renewable energy is being joined to electrical grids by usage of power converters with hundreds of megawatt power. But this system is not reliable and single point faults may occur which can lead to system failure on a larger scale. The point here is that, what measures should be taken to avoid these faults? How system can be made reliable and robust?

This project is the answer to these questions.

Project Objectives

Mostly, several inverters are connected in parallel and power is shared among these inverters rather using a single inverter with hundreds of megawatt power.
This project utilizes the parallel inverters that take out DC power from Photovoltaic array into AC power and merge it with the grid.

Project Implementation Method

• The following circuit flow diagram shows the implementation method when 3Ø input is considered. 

• We are to use the Photovoltaic Panels that extract solar energy as input, so the implementation tecnique we use is as follow:

? DC-DC Converter is a push-pull converter

? MPPT is Maximum Power Point Tracking Control for solar energy 

Benefits of the Project

For grid-tied inverters, the crucial control objectives are to keep the voltage and the frequency synchronized with the grid, control active and reactive flow to the grid and keep harmonic fluctuations lesser than a standard limit. For parallel operation of inverters, it is important to lessen the circulating currents among inverters, maintenance cost and it should have easy debugging of inverter section.

This kind of parallelism of inverters provides reliability, robustness, low initial and maintenance coast. For inverters connected across a common DC link capacitor, the circulating currents are no longer a problem as each inverter unit produces the same pulse width modulated (PWM) output.

Technical Details of Final Deliverable

1. Solar Panels
2. Maximum Power Point Tracking Control
3. 2 x High Frequency Transformers
4. 2 x Inverters
5. Sensor based control of Inverters
6. Interfacing and synchronization

Final Deliverable of the Project Hardware SystemType of Industry Energy Technologies RoboticsSustainable Development Goals Industry, Innovation and InfrastructureRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	75000
Solar panel	Equipment	2	9000	18000
TLP250	Equipment	14	100	1400
STM32 Microcontroller	Equipment	2	4000	8000
Raspberry Pi	Equipment	1	3500	3500
PCB printing and assembling	Equipment	8	4000	32000
12V batteries	Equipment	2	2000	4000
2 winding transformer	Equipment	2	500	1000
diodes, resister and capacitor, ferite cable etc	Miscellaneous	25	200	5000
current sesor	Equipment	2	500	1000
voltage sensor	Equipment	2	550	1100