What are Inverters and their Classification

Today's inverter systems can power all your devices with ease, whether low-power-consuming appliances such as fans and lights or high-power-consuming air conditioners, washing machines, and refrigerators. The market now offers a wide range of inverters, making energy storage systems more accessible for households aiming to improve their energy efficiency. To get started, let's explore the definition of inverters, their classification, and their various applications.

 What Is An Inverter?

 An inverter is a device that converts DC voltage into AC voltage. It serves as a standalone equipment for applications like solar power or as a backup power system powered by separately charged batteries.

Inverters can be classified based on several factors, and it is essential to understand these classifications before delving into their applications. To learn more, continue reading.

 Classification Of Inverters

 Classification based on the mode of operation

Considering the classification based on the mode of operation, inverters can be classified into three broad categories:

A off-grid inverter is commonly employed to convert the direct current produced by renewable energy distributed generation sources, such as solar panels or small wind turbines, into electricity to power homes and small industries, especially in isolated areas without access to the main utility grid. Solar inverters come equipped with special features tailored to photovoltaic arrays to allow for optimal power point tracking and anti-islanding protection.

The on-grid inverters are aptly synchronized with the grid's frequency and voltage level. They come packed with maximum power point tracking features to enable the extraction of the maximum power and elaborate safety features. Furthermore, synchronous inverters are capable of connecting to the grid and facilitate routing to or from the grid based on the current requirement.

A bimodal hybrid inverter is a powerful device that seamlessly combines the essential features of both off-grid and on-grid inverters. With the flexibility to operate both independently and as a part of large power grids, bimodal hybrid inverters can switch between various modes to deliver optimal energy efficiency and high performance. Ideal for solar power generation systems, bimodal hybrid inverters are an innovative solution that cater to the diverse needs of modern energy consumption.

Classification based on Output Wave

The square wave inverter is designed to convert DC input into AC output in the form of a square wave. Although the conversion process is relatively simple, the high harmonic content present in the square wave makes it unsuitable for use in AC motors and transformers where high harmonic signals are prevalent. Nonetheless, this technology served as a stepping stone towards the development of newer and superior technologies.

The quasi-square wave inverter is a modified version of the square wave inverter. While its output resembles that of a square wave, it briefly drops to zero volts before switching polarity. Not only is this inverter simple and cost-effective, it also works well with most electronic devices.

As the name suggests, a pure sine wave inverter produces a near-perfect sine wave output with less than 3% total harmonic distortion. This allows the inverter to be compatible with both utility-supplied grid power and all AC electronic devices, making it an ideal choice for grid-tie inverters. However, due to the complexity of its design and the advanced features, it is slightly more expensive per unit power than other options.

 Classification based on the number of phases of the output AC

The single-phase inverter finds its application in low to medium demand power requirements and single-phase circuits. Its characteristics of affordability and ease of design make it a preferred choice.

When it comes to demanding three-phase inversion applications, three-phase inverters are the way to go. Nonetheless, the process of inversion in these types of inverters is considerably more complicated compared to single-phase inverters.

Conclusion

As the cost of renewable energy technologies continues to decrease, the utilization of inverter-based energy resources is poised to become more prevalent. This transition will play an important role in reducing our reliance on non-renewable energy sources and creating a more environmentally-friendly, sustainable future.

I hope you’ve liked this article on the basics of various inverters, their types and applications.