Fault ride through of fully rated converter wind turbines with AC and DC transmission systems
Fault ride through of fully rated converter wind turbines with AC and DC transmission systems
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DOI：
10.1049/iet-rpg.2008.0018
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发表时间：
2009-09
影响因子：
2.6
通讯作者：
G. Ramtharan;A. Arulampalam;J. Ekanayake;F. Hughes;N. Jenkins
中科院分区：
文献类型：
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作者：
G. Ramtharan;A. Arulampalam;J. Ekanayake;F. Hughes;N. Jenkins
描述了海上风电场中通过高压交流输电或高压直流输电与陆上电网相连的全额定换流型风力发电机组的故障转移。利用矢量控制技术实现了对发电机和电网侧变流器的控制。为保护风电机组直流侧电容器的过电压，采用了一种卸载方案。演示了每台发电机的卸载如何帮助通过暖通空调输电连接的风电场度过故障。通过增大风电机组网侧变流器的无功电流，提高了故障时交流电网的电压恢复能力。对于通过高压直流输电线路连接的风电场，一种实用的故障穿越保护方案是在高压直流输电线路上采用斩波电路。文中还讨论了该方法的两种替代方案。第一种方法涉及在检测到故障时卸载风电场，这需要将故障情况传达给风电场的每个风力涡轮机。第二种方案通过控制高压直流输电链路将故障状态转移到离岸换流器，从而避免了这种复杂的通信要求。对三种方案的故障性能进行了仿真，并利用仿真结果对各自的故障性能进行了评估。
Fault ride through of fully rated converter wind turbines in an offshore wind farm connected to onshore network via either high voltage AC (HVAC) or high voltage DC (HVDC) transmission is described. Control of the generators and the grid side converters is shown using vector control techniques. A de-loading scheme was used to protect the wind turbine DC link capacitors from over voltage. How de-loading of each generator aids the fault ride through of the wind farm connected through HVAC transmission is demonstrated. The voltage recovery of the AC network during the fault was enhanced by increasing the reactive power current of the wind turbine grid side converter. A practical fault ride through protection scheme for a wind farm connected through an HVDC link is to employ a chopper circuit on the HVDC link. Two alternatives to this approach are also discussed. The first involves de-loading the wind farm on detection of the fault, which requires communication of the fault condition to each wind turbine of the wind farm. The second scheme avoids this complex communication requirement by transferring the fault condition via control of the HVDC link to the offshore converter. The fault performances of the three schemes are simulated and the results were used to assess their respective capabilities.