Research on Harmonic Monitoring Technology of Xiamen MMC-HVDC Transmission Project

In order to realize the comprehensive monitoring of DC side harmonics of Xiamen MMC-HVDC transmission project, this paper proposes a convenient and feasible harmonic monitoring scheme based on actual engineering conditions. According to this scheme, a DC side harmonic monitoring system is constructed. The system can not only perform harmonic analysis and over-limit alarm on the DC side harmonics of the whole station, but also has the function of fault recording, the degree of integration is high. Through this system, the distribution of the harmonics of the DC side of the whole station can be clearly understood. It provides guarantee for the safe and stable operation of the MMC-HVDC transmission project. The FFT and artificial neural network algorithm are used to analyze the harmonic signals within 50 times. The calculation is small and the real-time performance is high, which can meet the needs of actual engineering.