摘要
柔性直流换流站采用虚拟串联阻抗有源阻尼控制策略无法彻底将交流阻抗在中高频段全部重塑为正阻尼特性,高频振荡风险依旧存在。针对有源阻尼控制策略解决高频振荡全工况适应性难问题,首先基于换流器简化模型,以数学解析形式分析电压前馈环节如何影响换流器第一个高频段负阻尼频率区间及其电导最小值的规律;其次,为彻底解决高频振荡问题,提出有源和无源协调抑制方案与原则,其中有源阻尼控制策略并不用于抑制高频振荡,而是用于改善换流器第一个负阻尼区间的电导特性,以至于降低无源阻尼滤波器的参数;再次,以电压直接前馈特征和协调抑制原则为基准,分析传统二阶高通滤波器作为阻尼控制器改善换流器电导特性时的不适应性,提出采用四阶低通滤波器作为有源阻尼控制器的主导形式;最后,以换流站高频段电导正阻尼为准则,对有源阻尼控制器和无源阻尼滤波器的参数进行解析计算与优化设计,并开展电磁暂态仿真验证。
Active damping control with virtual series impedance features in flexible HVDC systems is impossible to completely reshape the AC impedance of converter station into positive damping in medium-high frequency range resulting in the risk of high frequency resonance(HFR)still exists.In response to the adaptable difficulties of active damping control strategy in solving the problem of HFR under all operating conditions,a simplified model with mathematical expression of converter is used to analyze how the voltage feed forward part affects the first negative damping frequency range of high frequency segment and its minimum conductivity value.Secondly,to completely solve the problem of HFR,an active and passive coordinated suppression method and principle have been proposed.The active damping control strategy is not used to suppress HFR,but rather to improve the conductivity features of the first high frequency negative damping range for reducing the parameters of passive damping filter.Thirdly,according to the characteristic of direct voltage feed forward and principle of coordinated suppression,the inadaptability of traditional second order high-pass filter as damping controller to improve the conductivity characteristics of converter is analyzed.Therefore,a fourth order low-pass filter is proposed as the dominant form of active damping controller.Finally,the parameters of active damping controller and passive damping filter are analytically calculated and optimized based on the positive damping criterion of converter in high frequency range.The electromagnetic transient simulation models are used to validate the correctness of the studies.
作者
李云丰
孔明
曹一家
朱介北
文涛
陈长胜
钱学威
LI Yunfeng;KONG Ming;CAO Yijia;ZHU Jiebei;WEN Tao;CHEN Changsheng;QIAN Xuewei(National Key Laboratory of Power Grid Disaster Prevention and Reduction(Changsha University of Science and Technology,School of Electrical&Information Engineering),Changsha 410114,Hunan Province,China;Beijing Huairou Laboratory,Huairou District,Beijing 101499,China;Tianjin University,Nankai District,Tianjin 300072,China)
出处
《中国电机工程学报》
北大核心
2025年第5期1874-1890,I0022,共18页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家自然科学基金项目(U23B20128,52207187)
湖湘青年英才(2023RC3145)
湖南省自然科学基金项目(2024JJ5021)。
关键词
柔性直流输电
高频振荡
有源阻尼控制
无源阻尼滤波器
协调抑制
参数解析计算
flexible HVDC
high frequency resonance
active damping control
passive damping filter
coordinated suppression
parameters analytical calculation
