摘要
风电机组若具备常规发电机组对系统功率振荡的阻尼作用,有利于提高风电渗透率较高的区域电网的稳定性。本文首先分析了电网扰动时引起永磁直驱风电机组全功率变流器直流侧电压波动的原因,并提出了抑制直流电压波动的解决方案,以保证风电机组在稳定运行的前提下能快速对电网提供功率支持。其次,分别分析了永磁直驱风电机组通过有功、无功调节增加系统阻尼的原理,并进一步提出了风电机组基于有功、无功附加控制的阻尼控制策略。最后,通过对含30%风电装机容量的三机系统的仿真分析,验证了系统发生扰动后在所提控制策略的协调控制下,不仅能够提高永磁直驱风电机组的故障穿越能力,并可使系统功率振荡迅速衰减,改善系统的阻尼特性。
The damping capability of the wind turbines for power system oscillations is benefit to improve the stability of the power system with large wind power integration.In this paper,the reasons which cause the DC side voltage fluctuation of the full scale power converter of the direct driven permanent magnet synchronous generator（PMSG）-based wind turbines during grid disturbance are discussed firstly,and the solutions to control the dc voltage fluctuation are proposed,which ensures the wind turbines with stable operation and to provide power support to the grid quickly.And then,the principle of improving the system damping through the power regulation of the PMSG-based wind turbines is investigated,and the active and the reactive power damping control strategies are also proposed,respectively.Finally,a three-machine system with 30% wind power penetration is used to validate the proposed control strategies.The simulation results show that the PMSG-based wind turbines not only have the fault ride through ability but also have the fast respond ability to damp the power system oscillations using the presented control strategies,so that the damping characteristic of the power system is improved.
出处
《电工技术学报》
EI
CSCD
北大核心
2012年第12期162-171,共10页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50977028
51277072)
