摘要
常规比例—微分(PD)虚拟惯量控制策略可使直驱式风电机组为系统提供频率支撑,但其控制参数和算法固定,在风电场多机并网条件下调频效果欠佳。文中给出了PD虚拟惯量控制方式相关参数的整定方法,分析了不同风速区机组转子动能和变流器容量对机组调频能力的影响。据此提出了一种考虑机组间调频能力差异的虚拟惯量协同控制策略,该策略引入转子动能评估因子和变流器容量限制因子以体现功率协调。风电场仿真结果表明,该控制策略在充分发挥各机组调频能力的同时避免了系统频率的二次跌落现象,调频效果得到进一步改善。
The traditional proportion-differential （PD） virtual inertia control strategy enables directly-driven wind turbines to provide frequency support for the main power system. However, the frequency regulation is not effective since the control strategy introduced to the grid-connected wind farms using fixed control parameters and algorithms. This paper provides a novel method calculating the parameters in the PD virtual inertia control and analyzes the influence of rotor kinetic energy and converter capacity in different wind speed intervals on the frequency regulation ability of directly-driven wind turbines. A coordinated virtual inertia control strategy considering different frequency regulation abilities of wind turl：ines is proposed. The rotor kinetic energy evaluation factor and converter capacity limit factor are introduced to reflect power coordination. Simulation results demonstrate that this strategy maximizes the frequency regulation abilities of directly driven wind turbines and avoids the secondary drop phenomenon of system frequency, while further improves the main system frequency regulation results. This work is supported by National Basic Research Program of China （973 Program） （No. 2012CB215103） and National Natural Science Foundation of China （No. 51077130, No. 51377167）.
出处
《电力系统自动化》
EI
CSCD
北大核心
2015年第5期27-33,共7页
Automation of Electric Power Systems
基金
国家重点基础研究发展计划(973计划)资助项目(2012CB215103)
国家自然科学基金资助项目(51077130
51377167)~~
关键词
风电场
直驱式风电机组
虚拟惯量
调频能力
协同控制
wind larch
directly-driven wind turbines
virtual inertia
frequency regulation ability
coordination control
