Shitao Sun1; Yu Lei1; Guowen Hao2; Yi Lu1; Jindong Liu3; Zhaoxin Song3; Jie Zhang1
1. North China Electric Power Research Institute Co., Ltd., Beijing, China
2. State Grid Xinyuan Co., Ltd., Beijing, China
3. Hebei Fengning Pumped Storage Energy Co. Ltd., Chengde, China
S. Sun et al., "Transient Damping of Virtual Synchronous Generator for Enhancing Synchronization Stability During Voltage Dips," in CES Transactions on Electrical Machines and Systems, vol. 8, no. 2, pp. 143-151, June 2024, doi: 10.30941/CESTEMS.2024.00021.
摘 要
虚拟同步发电机（VSGs）作为一种很有前途的并网方案被广泛应用于可再生能源发电、变速抽水蓄能机组等。指出VSGS可以为频率支持提供虚拟惯性，但较大的惯性会恶化同步稳定性，即在电压骤降期间保持与电网的同步。为此，本文提出了一种VSGS的暂态阻尼方法，以提高电压骤降时的同步稳定性。结果表明，VSGS的同步损失往往伴随着正频偏，当平衡点存在时，阻尼是消除同步损失的关键因素。为了提高电压骤降时的同步稳定性，提出了由有功环频率偏差产生的暂态阻尼。该方法还可以实现正常状态与电网故障的无缝切换。此外，针对暂态阻尼增益给出了详细的控制设计，以保证电压骤降时不同惯性要求下的同步稳定性。最后给出了实验结果，验证了分析结果和改进的瞬态阻尼方法的有效性。
Abstract
Virtual synchronous generators (VSGs) are widely introduced to the renewable power generation, the variable-speed pumped storage units, and so on, as a promising grid-forming solution. It is noted that VSGs can provide virtual inertia for frequency support, but the larger inertia would worsen the synchronization stability, referring to keeping synchronization with the grid during voltage dips. Thus, this paper presents a transient damping method of VSGs for enhancing the synchronization stability during voltage dips. It is revealed that the loss of synchronization (LOS) of VSGs always accompanies with the positive frequency deviation and the damping is the key factor to remove LOS when the equilibrium point exists. In order to enhance synchronization stability during voltage dips, the transient damping is proposed, which is generated by the frequency deviation in active power loop. Additionally, the proposed method can realize seamless switching between normal state and grid fault. Moreover, detailed control design for transient damping gain is given to ensure the synchronization stability under different inertia requirements during voltage dips. Finally, the experimental results are presented to validate the analysis and the effectiveness of the improved transient damping method.
作者信息
孙士涛，高级工程师，2013年获浙江大学电气工程硕士学位，现就职于华北电力科学研究院有限责任公司高电压技术研究所。研究方向：大容量电机运行控制、故障诊断。
雷雨，高级工程师，2012年获哈尔滨工业大学电气工程硕士学位，现就职于华北电力科学研究院有限责任公司高电压技术研究所。研究方向：大容量电机运行控制、故障诊断。
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《中国电工技术学会电机与系统学报（英文）》(CES TEMS)是中国电工技术学会和中国科学院电工研究所共同主办、IEEE PELS学会技术支持的英文学术期刊。期刊发表国内外有关高性能电机系统、电机驱动、电力电子、可再生能源系统、电气化交通等研发及应用领域中原创、前沿学术论文。中国工程院院士马伟明担任主编，IEEE的执委Don Tan博士为国际主编。目前已被EI、Scopus、 Inspec、Google scholar、IEEE Xplore、中国科学引文数据库(CSCD) 核心版、DOAJ、CSTPCD、知网、万方、维普等数据库收录。
