电力系统自动化2018，Vol.42Issue(9)：36-43,8.DOI:10.7500/AEPS20171122007
大电网中虚拟同步发电机惯量支撑与一次调频功能定位辨析
Functional Orientation Discrimination of Inertia Support and Primary Frequency Regulation of Virtual Synchronous Generator in Large Power Grid
摘要
Abstract
As the penetration of renewable energy increases continuously,the inertia of synchronous power grid and the ability of primary frequency regulation are declining.If renewable energy power generators adopt the virtual synchronous generator (VSG)technology,they can make due contributions to slow down the rate of system frequency variation and reduce the system frequency deviation under the impact of large power shortage.Aiming at the current situation of unclear functional orientation of inertia support and primary frequency regulation in the research on VSG,it is urgent to define the functional orientation demand of both inertia support and primary frequency regulation of VSG in its application in the large power grid.Firstly,this paper analyzes the inertia support function of VSG and its physical meaning.Then the expression formula of inertia support power of VSG is deduced.Secondly,the distinction between the inertial support function and the primary frequency regulation function of VSG is analyzed in detail.Thirdly,this paper simulates and analyzes the roles of the VSG using different control functions in the dynamic characteristic of system frequency changing caused by power imbalance in the large-scale synchronous grid.Finally,it is pointed out that,in a large synchronous power grid,the impact brought by reduction of primary frequency regulation ability is more serious than that brought by the decrease of system inertia.The power system needs the continuous power support of VSG for the primary frequency regulation more than short-term inertia support power.关键词
虚拟同步发电机/惯量支撑/一次调频/大电网Key words
virtual synchronous generator(VSG)/inertia support/primary frequency regulation/large power grid引用本文复制引用
秦晓辉,苏丽宁,迟永宁,郭强,徐希望..大电网中虚拟同步发电机惯量支撑与一次调频功能定位辨析[J].电力系统自动化,2018,42(9):36-43,8.基金项目
国家电网公司总部科技项目"基于虚拟同步技术的友好型新能源接入电网关键技术研究".This work is supported by State Grid Corporation of China. （）
