The power drive system of the pipeline compressor drives the brushless excitation synchronous motor with a voltage source converter. The synchronous starting control scheme can solve the problem of difficult starting without position sensor, but it may cause a short time inversion of motor rotation during starting. By analyzing the starting control scheme of brushless excitation synchronous motor commonly used in frequency converter, using commissioning process of a 16 MW electric motor driven system as an example, this paper introduces a Low-Frequency Pulse Signal Injection (LF PULSE) control scheme for sensorless brushless synchronous motor. The field test verifies the effectiveness of the improved control scheme in solving the issue of rotation inversion during starting and ensures the safe start-up and stable operation of the unit. The Low-frequency Pulse Signal Injection is successfully applied for the first time to suppress rotation inversion during starting of the brushless excitation synchronous motor, which has a significance in demonstrating and guiding the continuous improvement of the converter control scheme in the future.