摘要
大规模光伏发电系统并网使电网等效惯量显著下降,因此带来的频率稳定问题备受关注。为改善电网频率稳定性问题,在光伏并网逆变器控制回路中采用虚拟同步发电机(VSG)控制可实现对电网频率的跟踪调节和主动支撑。首先建立了光伏VSG数学模型,研究了光伏VSG并网调频特性。其次,基于两机多端系统分析了不同虚拟转动惯量及渗透率参数下,光伏VSG对于电网频率的支撑作用。最后基于RTDS硬件在环实验平台搭建了4台光伏VSG并联系统,系统实验充分验证了电网高频/低频故障条件下,光伏VSG对于电网频率支撑的有效性。
The grid equivalent inertia of large-scale photovoltaic power generation system is significantly reduced,so the frequency stability problem caused by the grid is of great concern.In order to improve the frequency stability of power grid,virtual synchronous generator(VSG)control is adopted in the control loop of photovoltaic grid-connected inverter to realize the tracking adjustment and active support of power grid frequency.Firstly,a photovoltaic VSG mathematical model is established to study the frequency modulation characteristics.Secondly,based on the two-machine multi-terminal system,the supporting effect of photovoltaic VSG on power grid frequency under different virtual inertia and permeability parameters is analyzed.Finally,based on RTDS hardware in loop experiment platform,four photovoltaic VSG parallel systems are built.The system experiment fully verifies the effectiveness of photovoltaic VSG for the frequency support of the power grid under the condition of high-frequency/low-frequency fault.
作者
汤代斌
刘宿城
TANG Dai-bin;LIU Su-cheng(Anhui Technical College of Mechanical Electrical Engineering,Wuhu 241002,China;不详)
出处
《电力电子技术》
CSCD
北大核心
2021年第8期67-70,78,共5页
Power Electronics
基金
安徽省教育厅2017年高等学校省级质量工程项目(2017JXTD113)
安徽省高校省级自然科学研究重点项目(KJ2016A135)。
关键词
虚拟同步发电机
光伏发电
频率支撑
virtual synchronous generator
photovoltaic power generation
frequency support
