采用三阶模型的虚拟同步发电机功率振荡特性分析及附加阻尼控制  

Characteristics Analysis and Suppression of Power Oscillation of Virtual Synchronous Generator Using Three-order Model

作　　者：陈谦[1] 周文海 何承树 王晨晟 CHEN Qian;ZHOU Wenhai;HE Chengshu;WANG Chensheng(College of Energy and Electrical Energy,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学能源与电气学院,南京211100

出　　处：《高电压技术》2023年第2期682-690,共9页High Voltage Engineering

基　　金：国家自然科学基金(51837004)。

摘　　要：虚拟同步发电机(virtual synchronous generator, VSG)为电力电子化电力系统所存在的惯量不足等问题提供了新的解决方案,但VSG是基于同步发电机的数学模型设计的,因此也存在传统同步电机的功率振荡问题。采用同步发电机的三阶模型进行VSG–无穷大系统的小信号模型的构建,并通过复数力矩系数法,分析得出在一定条件下,VSG–无穷大系统在线路阻抗等因素的影响下将产生负阻尼力矩,且线路电阻对负阻尼力矩具有非线性影响,功率振荡的可能性较大。设计一种用于改善系统阻尼特性的附加阻尼力矩补偿器(additionaldampingtorquecompensator,ADTC),通过引入正阻尼力矩抑制功率振荡。最后通过仿真,验证了负阻尼力矩的影响因素及ADTC的可行性与有效性。Virtual synchronous generator(VSG) provides a new solution to deal with insufficient inertia in a power-electronic-dominated power system. However, the VSG is derived from the mathematical model of synchronous generator, thus the problem of power oscillation of traditional SG also exists. Consequently, a three-order model of the synchronous generator is used to construct VSG. Based on the small-signal model of the VSG under the connection to infinite bus system, analysis by a complex torque coefficient method shows that, in certain conditions, the system may produce negative damping torque under the influences of line impedance and other factors. Meanwhile, the line resistance will introduce nonlinear effects into the negative damping torque, which has the risk of power oscillation. The additional damping torque compensator(ADTC) is designed to improve the damping characteristics of the system, in which a positive damping torque is introduced to suppress the power oscillation. Finally, the simulation is built to verify the influencing factors of negative damping torque and the feasibility and effectiveness of ADTC.

关 键 词：电力电子化 虚拟同步发电机 功率振荡 小信号稳定 附加阻尼力矩补偿器 

分 类 号：TM712[电气工程—电力系统及自动化] TM341