With more and more wind power generation integrated into power grids to replace the conventional turbine-generator (T-G) units,how the subsynchronous resonance (SSR) of conventional T-G units is affected becomes an im...With more and more wind power generation integrated into power grids to replace the conventional turbine-generator (T-G) units,how the subsynchronous resonance (SSR) of conventional T-G units is affected becomes an important technical issue.In this paper,a group of T-G units are interconnected with a series compensated transmission line,and some units are substituted by a nearby DFIG-based wind farm (WF).Under such circumstances,the SSR of power systems would change accordingly.This paper establishes the mathematical model to analyze the torsional interaction (TI) and the induction generator effect of the T-G units.Both eigenvalue analysis and time domain simulations demonstrate the impact of DFIG-based WF on SSR of power systems and how the control parameters of wind farms can affect the SSR.展开更多
文摘针对风电场接入串补输电系统,研制一种网侧次同步阻尼控制器(grid-side subsynchronous damping controller,GSDC)抑制次同步谐振(subsynchronous resonance,SSR)。GSDC由次同步阻尼计算器(subsynchronous damping calculator, SDC)和次同步电流发生器(subsynchronous current generator,SCG)构成,通过向风电场注入可控的次同步频率电流,实现抑制风电场SSR的目标。阐述了GSDC的工作原理和设计方法。研发了一套等效容量为10MVA、输出电压为35k V的装置,并通过基于实时数字仿真仪(real time digital simulator,RTDS)的硬件在环试验验证效果。结果表明:研发的GSDC能提高系统次同步频率的阻尼并有效抑制SSR,为解决风电场次同步谐振和振荡问题提供一种有效的技术手段。
文摘With more and more wind power generation integrated into power grids to replace the conventional turbine-generator (T-G) units,how the subsynchronous resonance (SSR) of conventional T-G units is affected becomes an important technical issue.In this paper,a group of T-G units are interconnected with a series compensated transmission line,and some units are substituted by a nearby DFIG-based wind farm (WF).Under such circumstances,the SSR of power systems would change accordingly.This paper establishes the mathematical model to analyze the torsional interaction (TI) and the induction generator effect of the T-G units.Both eigenvalue analysis and time domain simulations demonstrate the impact of DFIG-based WF on SSR of power systems and how the control parameters of wind farms can affect the SSR.
