颜文辞,贾思思,杜波,王丹,罗金,周开茂,陶征
YAN Wenci,JIA Sisi,DU Bo,WANG Dan,LUO Jin,ZHOU Kaimao,TAO Zheng

• 1:乌东德水力发电厂
• 2:强电磁技术全国重点实验室(华中科技大学)
• 3:南京南瑞继保电气有限公司

摘要(Abstract)：

针对新能源机组动态无功支撑能力不足导致的系统电压稳定性和阻尼问题，提出了一种适用于大型水电机组的新型柔性励磁系统功率主回路拓扑。基于大型水电机组的特性，设计了包含前置ANPC（有源中点箝位型）三电平变换器和后置新型三电平斩波器的主回路，并详细分析了直流侧电压、功率器件耐压耐流、直流侧电容及网侧电感等关键参数。通过Simulink仿真平台，对比柔性励磁系统与常规晶闸管励磁系统的性能，结果表明柔性励磁系统在强励性能和故障扰动下的支撑能力方面具有显著优势，能够有效缩短振荡时间，增强电力系统稳定性。该研究为大型水电机组励磁系统的优化设计提供了理论依据，为柔性励磁系统的工程应用奠定了基础。
In response to the system voltage stability and damping issues caused by insufficient dynamic reactive power support capability of renewable energy units, this paper proposes a novel power main circuit topology for flexible excitation systems suitable for large hydropower units. Based on the characteristics of large hydropower units, a main circuit consisting of a front-end active neutral-point clamped(ANPC) three-level converter and a novel rearend three-level chopper is designed. Key parameters such as DC-side voltage, voltage and current withstand capability of power device, DC-side capacitance, and grid-side inductance are analyzed. Through the Simulink simulation platform, the performance of the flexible excitation system is compared with that of a conventional thyristor excitation system. The results demonstrate that the flexible excitation system exhibits significant advantages in terms of strong excitation performance and support capability under fault disturbances, effectively reducing oscillation time and enhancing power system stability. This research provides a theoretical basis for the optimal design of excitation systems for large hydropower units and lays the foundation for the engineering application of flexible excitation systems.

关键词(KeyWords)： 柔性励磁;大型水电机组;三电平变换器
flexible excitation;large hydropower units;three-level converter

Abstract:

Keywords:

基金项目(Foundation): 中国长江电力股份有限公司科研项目（Z522302059）

作者(Author): 颜文辞,贾思思,杜波,王丹,罗金,周开茂,陶征
YAN Wenci,JIA Sisi,DU Bo,WANG Dan,LUO Jin,ZHOU Kaimao,TAO Zheng

DOI: 10.19585/j.zjdl.202504002

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