High Frequency Pulasting Voltage Injection Method Based on Improved Generalized Second Order Integrator

To address the issue of compromised observation accuracy caused by system phase delays resulting from the use of multiple filters in traditional high-frequency pulsating voltage injection methods. This paper proposes the adoption of an improved second-order generalized integrator (improved SOGI) for signal demodulation. This method employs an improved SOGI to extract motor speed and rotor position information, reduces system phase delay, and consequently enhances observation accuracy. The final simulation and experimental results demonstrate that compared with the traditional pulsating high-frequency injection method, the improved approach introduces a lower delay (approximately 0.005s) and reduces speed estimation error by approximately 70%. Consequently, this method enhances system observation accuracy and improves dynamic response performance.