摘要
对风电采用多电平柔性直流输电接入电网的控制进行了研究。首先建立了柔性直流输电系统在三相静止坐标系下的详细数学模型,然后导出了在dq0旋转坐标系下的数学模型。对于系统级控制,基于电压向量定向直接电流控制方法提出了适合于风电接入的定有功功率与频率辅助控制策略。另外,设计了定交流电压控制器以及定直流电压控制器。通过PSCAD/EMTDC仿真软件对所提出的模型和控制方法进行了验证,仿真结果表明整个系统具有良好的控制性能。
The grid-connection control strategy of wind farms by multilevel flexible DC power transmission was researched.Firstly,a detailed mathematical model of flexible DC power transmission system in three-phase static coordinate system coordinate system was built;then corresponding mathematical model in d-q rotating coordinate system was derived.For system-level control,based on the voltage vector orientation and current direct control a constant active power and frequency auxiliary control strategy suitable for grid-connection of wind farms was proposed.Besides,a constant AC voltage controller and a constant DC current controller were designed.The proposed models and control strategy were verified by simulation on PSCAD/EMTDC platform,and simulation results showed that the control performance of the proposed control system was satisfied.
出处
《电网技术》
EI
CSCD
北大核心
2012年第9期182-186,共5页
Power System Technology
基金
国家高技术研究发展计划项目(863计划)(2011AA05A102)~~
关键词
柔性直流输电
多电平换流器
向量控制
有功控制
频率辅助控制
VSC-HVDC power transmission
converter
vector control
active power control
auxiliary controlmultilevelfrequency KEY WORDS： VSC-HVDC power transmission
converter
vector control
active power control
auxiliary controlmultilevelfrequency
