风电机组辅助水电主导调频电网的频率动态特性研究
Study on Dynamic Characteristics of Frequency in Wind Turbine-assisted Hydropower-dominated Power Grid
何鑫 1杨映海 2周鑫 1王德林2
作者信息
- 1. 云南电网有限公司电力科学研究院,云南 昆明 650217
- 2. 西南交通大学电气工程学院,四川 成都 611756
- 折叠
摘要
水轮机的水锤效应可能会恶化以水电机组为主的地区电网的频率动态特性,对电网的频率安全造成威胁.通过控制风机的传统虚拟惯量释放风机转子动能,可以有效遏制水锤效应,但是虚拟惯量控制由于引入了微分和比例环节,不利于电网频率的暂态性能.为此,提出了一种风电机组辅助、水电主导调频的改善电网频率动态特性的新方法.通过控制风电机组的短时附加功率,不仅能够抑制电网的频率偏移,而且减小了对频率暂态性能的影响.同时,通过合理设置控制参数,还能有效避免频率的二次跌落.基于搭建的仿真算例,验证所提出的方法的有效性.
Abstract
The water hammer effect of hydraulic turbine may worsen the frequency dynamics of the regional power grid dominated by hydropower units,posing a potential threat to the frequency safety of the grid.The control of conventional virtual inertia of wind turbine can release the rotor kinetic energy and suppress the water hammer effect,but the virtual inertia control also affects the dynamic performance of the power grid frequency due to the introduction of differential-and proportional links.This paper proposes a novel method to improve the frequency dynamic characteristics of hydropower-domina-ted power grid aided by wind turbines.By controlling the short-term additional power of wind turbines,not only can frequency offset of hydropower-dominated power grid be suppressed,but the impact upon frequency transient performance is also reduced.Then,by setting control parameters reasonably,it is also possible to effectively avoid secondary frequency drops.Finally,based on the constructed simulation examples,the effectiveness of the proposed method is verified.
关键词
水锤效应/频率调节/短时附加功率控制/暂态性能/二次跌落Key words
water hammer effect/frequency regulation/short-time additional power control/transient characteristic/secondary drop引用本文复制引用
出版年
2024
NETL
NSTL
万方数据