谐波保持型平均值模型用于电磁暂态仿真中的换流器

The increasing utilization of power electronic devices has heightened the impact of harmonics in modern power systems. However, compared with detailed models, conventional average-value models (AVMs) result in reduced accuracy due to the neglect of switching harmonics, making it challenging to meet the accuracy requirements when focusing on transient responses or harmonic dynamics. To address this limitation, this paper proposes a system-level converter model called the harmonic-preserved AVM (HP-AVM). This time-domain-based model integrates AVM computation with harmonic component calculation into a unified simulation framework, enabling precision comparable to that of switching-function models (SFMs) for system-level simulation, while avoiding the high computational burden of detailed models. By leveraging AVMs as the backbone and preserving harmonic details, HP-AVM achieves both high computational efficiency and accurate harmonic representation in system-level simulations. Furthermore, HP-AVM demonstrates broad applicability across various converter topologies, including rectifiers, inverters, and choppers. Both simulation and experimental results validate the effectiveness of HP-AVM, demonstrating its high accuracy and computational efficiency.