1. Basic Knowledge of the Electrolytic Capacitorless Motor drive

This chapter delves into the critical aspects of electrolytic capacitorless motor drives, focusing on harmonic suppression for grid currents, beat suppression methods for the motor side, and techniques to improve voltage utilization. The text explores various control strategies and topologies designed to enhance system stability and performance. Key technologies discussed include resonance suppression based on negative impedance regulation, parallel virtual impedance, and auxiliary circuits. Additionally, the chapter examines beat suppression methods to address issues caused by DC-link voltage fluctuations and sampling delays. Strategies for improving voltage utilization, such as overmodulation control and linear modulation region extension, are also thoroughly analyzed. The chapter concludes with a summary of the advancements in motor drive systems, highlighting the importance of electrolytic capacitorless drives in reducing energy consumption and improving system reliability.