基于全状态模型的自同步电压源并网系统频率稳定分析  

Frequency Stability Analysis Based on Full State Model in Autonomous-Synchronization Voltage Source Interfaced Power System

作　　者：李振垚 甘德强[1] 栾某德 何国庆 LI Zhenyao;GAN Deqiang;LUAN Moude;HE Guoqing(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]中国电力科学研究院有限公司,北京100192

出　　处：《中国电力》2023年第5期182-192,共11页Electric Power

基　　金：国家电网有限公司科技项目(高比例新能源电力系统的自同步电压源型新能源发电关键技术研究,SGHBDK00DWJS2000362)。

摘　　要：使用自同步电压源控制方式的新能源是提升高比例新能源电力系统频率稳定的重要措施。针对自同步电压源并网系统,基于近似全状态模型,通过状态变量时域响应的解析解得到系统频率相关特征量与系统参数的量化关系。首先,将频率稳定问题转化为二次特征值问题,证明了系统惯量减小会降低系统频率惯量响应阶段的抗扰动性。其次,将自同步电压源模型与同步机模型参数进行对应,证明了调速器的作用相当于增加系统阻尼,能够减小受扰动后系统频率的稳态频率误差。然后,提出了一种满足预设频率动态安全要求的自同步电压源新能源虚拟惯量和下垂系数估计方法。最后,在10机39节点算例中验证了所提方法的正确性和有效性。The application of new energy controlled by autonomous-synchronization voltage source is an important measure to enhance the frequency stability of high penetration renewable energy power system.For autonomous-synchronization voltage source grid-connected system,the quantitative relationship between the frequency-related characteristic quantities of the system and the system parameters is obtained through the analytical solution to the time-domain response of the state variables based on the approximate full-state model.First,the frequency stability problem is transformed into a quadratic eigenvalue problem(QEP),which proves that the reduction of the system inertia will reduce the disturbance-rejection capability of the system frequency in the inertial response stage.Then,the parameters of the autonomous-synchronization voltage source model are compared with those of the synchronous machine model,and it is proved that the function of the governor is equivalent to increasing the system damping,which can reduce the steady-state error of the system frequency after being disturbed.Based on the above conclusions,a method for estimating the virtual inertia and droop coefficient of renewable energy with the autonomous-synchronization voltage source that meets the preset frequency dynamic safety requirements is proposed.Finally,the correctness and effectiveness of the above conclusions and methods are verified by a system with 10 machines and 39 nodes.

关 键 词：频率稳定 全状态模型 二次特征值问题 新能源发电 自同步电压源 

分 类 号：TM712[电气工程—电力系统及自动化]