基于飞轮储能的网/储协调虚拟同步机控制策略的小信号模型分析  

Small Signal Model Analysis of Network/Storage Coordination Virtual Synchronous Generator Control Based on Flywheel Energy Storage System

作　　者：许振宇 石梦璇 周建宇 陈霞[1] 文劲宇[1] XU Zhenyu;SHI Mengxuan;ZHOU Jianyu;CHEN Xia;WEN Jinyu(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),湖北省武汉市430074

出　　处：《中国电机工程学报》2020年第20期6536-6547,共12页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(613294);国家电网公司科技项目(521500190017)。

摘　　要：针对储能元件自身惯性与并网变流器接口虚拟惯性的配合问题,分析电力系统惯性的物理意义,并规定其表征形式——转动惯量。将储能装置与变流器接口对电网表现的惯性量化为等效转动惯量和虚拟转动惯量,以虚拟同步机控制的飞轮储能系统为例,研究两转动惯量之间的配合关系。将并网控制的飞轮储能系统划分为3个模块进行小信号建模,并根据各模块输入输出量之间的关系,建立全系统的小信号模型。通过参量根轨迹分析,探究虚拟转动惯量与飞轮储能的等效转动惯量的配合规律,系统的惯性与两惯量中的较小值处在同一水平,电路参数在设定的变化范围中对系统的惯性无明显影响,控制器参数使系统惯性在设定值附近波动,并因惯性水平的不同具有不同的敏感性。搭建系统的时域仿真,验证了小信号建模结论的有效性。There is a coordination problem between the inertia of the energy storage element and the virtual inertia of the grid-connected converter interface. This paper analyzed the physical meaning of the inertia of the power system, and gave rotational inertia as its representational form. The inertia of the energy storage elements and the converter was quantified as the equivalent rotational inertia and virtual rotational inertia. Taking the flywheel energy storage system(FESS) with virtual synchronous generator(VSG) as an example, the relationship between two rotational inertias was studied. The grid connected FESS was divided into three modules. According to the input and output relationship among each module, the small signal model of the whole system was established. The sensitivity analysis of the eigenvalues explores the relationship between the virtual rotational inertia and the equivalent rotational inertia of FESS. The inertia of the system is at the same level as the smaller of the two inertias. The circuit parameters in the range of setting did not affect the inertia of the system. The controller parameters make the system inertia fluctuate near the set point, and due to the difference of inertia level have different sensitivity. The simulation of the system was built to verify the validity of the conclusions of small signal modeling.

关 键 词：电力系统惯性 转动惯量 虚拟同步机 小信号建模 

分 类 号：TM73[电气工程—电力系统及自动化]