摘要
单元式虚拟同步机VSG(virtual synchronous generator)的接入环境往往面临电能质量问题,对此,提出具备电能质量复合控制功能的VSG。其拓扑采用三相四桥臂变流器结构。控制策略中,采用VSG功率外环控制与改进型虚拟阻抗控制并生成基波功率电流指令,采用基于滑动Goertzel变换的改进型FBD法检测补偿电流,采用多重准比例谐振控制跟踪基波与补偿电流指令,最终3维空间矢量调制生成四桥臂变流器驱动信号。RTLab硬件在环实验证明,VSG在惯性响应电网频率/电压变化的同时,能够补偿负载谐波、无功与不平衡电流,且适用于非理想电网条件。
The access environment of a unit virtual synchronous generator(VSG)often faces power quality problems.Accordingly,a VSG with power quality composite control function is proposed in this paper,and a three-phase four-leg converter structure is adopted in its topology.Under this control strategy,the VSG power outer-loop control and improved virtual impedance control are used to generate fundamental power current instructions,the improved FBD method based on sliding Goertzel transform is used to detect compensation current,and the multiple quasi-proportional resonance control is used to track fundamental and compensation current instructions.Finally,three-dimensional space vector modulation generates the driving signals for the four-leg converter.An RT-Lab hardware-in-loop experiment proved that the VSG can compensate load harmonics,reactive power,and unbalanced current while inertia responds to the variations of frequency/voltage of power grid,which is suitable for non-ideal power grid conditions.
作者
胡文强
吴在军
窦晓波
王建华
李晨阳
胡敏强
HU Wenqiang;WU Zaijun;DOU Xiaobo;WANG Jianhua;LI Chenyang;HU Minqiang(School of Electrical Engineering,Southeast University,Nanjing 210096,China)
出处
《电源学报》
CSCD
北大核心
2018年第6期18-26,共9页
Journal of Power Supply
基金
国家重点研发计划资助项目(2016YFB0900500)
国家自然科学基金资助项目(51677025)
国家电网公司科技资助项目(PD71-17-008)~~
关键词
虚拟同步机
电能质量复合控制
FBD法
准比例谐振控制
virtual synchronous generator(VSG)
power quality composite control
FBD method
quasi-proportional re-sonance control
