异步化汽轮发电机和同步汽轮发电机闭环阻尼特性的比较研究

以派克方程为基础，建立同步汽轮发电机单机无穷大系统线性化数学模型，该模型以机端电压偏差作为反馈进行励磁控制；同时建立异步化汽轮发电机在同步旋转X-Y轴系下的单机无穷大系统线性化数学模型，以深入分析双通道励磁控制策略对异步化汽轮发电机及其系统的影响。利用所建模型，对同步汽轮发电机和异步化汽轮发电机的闭环阻尼特性进行分析和比较。通过比较，揭示出同步汽轮发电机在引入快速励磁后可能导致电力系统发生低频振荡的原因，指出合理选取异步化汽轮发电机反馈励磁控制系数能够有效提高系统的静态稳定性、增强系统阻尼并有效遏制低频振荡。最后分析异步化汽轮发电机闭环阻尼特性与反馈励磁控制系数的关系，进一步明确异步化汽轮发电机在提高电力系统稳定性方面较同步汽轮发电机更具优势。

Closed-loop Damping Characteristics Analysis for Asynchronized Turbo-generators and Synchronous Turbo-generators

The one-machine infinite-bus system linearized mathematics model of the synchronous turbo-generator (STG) was established based on Park Equation. The stator voltage error was used as feedback of excitation control in this model. The one-machine infinite-bus system linearized mathematics model of the asynchronized turbo-generator (ASTG) in the synchronously rotational X-Y coordinate was established for analyzing the influence of dual-channel excitation control strategy on the ASTG and its system. The closed-loop damping characteristics of the ASTG and the STG was analyzed and compared. The reason of the low frequency oscillation in the STG resulted from fast excitation control was found. By choosing proper feedback excitation control parameters of the ASTG, the static stability of power system can be effectively improved, the system damping ability can be enhanced and low frequency oscillation of power system can be effectively restrained. The relationship between the closed-loop damping characteristics and the feedback excitation control parameters of the ASTG are investigated and the result shows that ASTG has advantage compared with STG in improving the stability of power systems.