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| High frequency stability analysis and oscillation suppression strategy for an MMC considering link delays |
| DOI：10.19783/j.cnki.pspc.240773 |
| Key Words:small signal stability state-space model high-frequency oscillation additional damping control high voltage DC transmission |
| Author Name | Affiliation | | XU Tao1 | 1. Kunming University of Science and Technology, Kunming 650500, China
2. Kunming Power Supply Bureau, Yunnan Power Grid Co., Ltd., Kunming 650011, China | | SHU Hongchun1 | 1. Kunming University of Science and Technology, Kunming 650500, China
2. Kunming Power Supply Bureau, Yunnan Power Grid Co., Ltd., Kunming 650011, China | | FENG Haiyang2 | 1. Kunming University of Science and Technology, Kunming 650500, China
2. Kunming Power Supply Bureau, Yunnan Power Grid Co., Ltd., Kunming 650011, China | | SUN Shiyun1 | 1. Kunming University of Science and Technology, Kunming 650500, China
2. Kunming Power Supply Bureau, Yunnan Power Grid Co., Ltd., Kunming 650011, China | | CHEN Youwei1 | 1. Kunming University of Science and Technology, Kunming 650500, China
2. Kunming Power Supply Bureau, Yunnan Power Grid Co., Ltd., Kunming 650011, China | | ZHANG Pihao1 | 1. Kunming University of Science and Technology, Kunming 650500, China
2. Kunming Power Supply Bureau, Yunnan Power Grid Co., Ltd., Kunming 650011, China |
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| Abstract:Because of the inherent link delay characteristics of a modular multilevel converter (MMC) based high voltage direct current (HVDC) transmission systems, high frequency oscillations may occur. Thus a small signal MMC model incorporating link delays is established. The eigenvalue analysis method is used to analyze the high frequency oscillation modes, and the underlying mechanism of high frequency oscillations is revealed. Also, a high-frequency oscillation suppression strategy based on a second-order notch filter is proposed to ensure sufficient positive damping in the high frequency band. A comparative analysis is conducted between this strategy and suppression methods using low-pass and nonlinear filters, evaluating their effectiveness in mitigating oscillations and their impact on MMC dynamic performance and fault ride-through capability. Finally, the correctness of the theoretical analysis and the effectiveness of the suppression measures are verified by electromagnetic transient simulations using the PSCAD/EMTDC platform. |
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