Concept of Real and Reactive Power

This chapter explores the concepts of ‘real’ and ‘reactive’ power in sinusoidal systems, beginning with a discussion of single-phase (two-wire) circuits to understand energy flow within a representative circuit configuration of electrical machines. The analysis extends to three-phase (three-wire) circuits to provide a comprehensive overview. The chapter incorporates mathematical modeling, using Kirchhoff’s voltage laws to derive power balance equations that address instantaneous power, which is defined as the product of instantaneous voltage and current. Key terms such as the power supplied to the network and energy dissipation occur in resistors, where energy is lost as heat. Additionally, it discusses the conversion of electrical energy to mechanical energy through various circuit elements. The inclusion of tutorials aims to reinforce the theoretical principles discussed, ensuring a robust understanding of these essential concepts in electrical engineering. The findings indicate significant implications for the electrical machines' performance and efficiency.