| 引用本文: | 翟冬玲,韩民晓,严稳利,孙 栩.DFIG型海上风电混合直流送出的控制策略[J].电力自动化设备,2015,35(2): |
| ZHAI Dongling,HAN Minxiao,YAN Wenli,SUN Xu.Control of offshore DFIG-based wind farm with hybrid HVDC transmission[J].Electric Power Automation Equipment,2015,35(2): |
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| 摘要: |
| 为了减少海上风电经采用电压源换流器的直流输电系统送出的系统的造价，提出的基于双馈风机的海上风电经混合直流输电送出的拓扑结构是：风电场侧换流器为电压源换流器，逆变侧换流器为电网换相换流器（LCC）。为保证系统在正常状态下稳定运行并能够对风速变化进行功率追踪，风电场侧换流站采取定交流电压和给定频率的控制，逆变侧采取定直流电压控制。同时，针对电网为弱系统时易发生连续换相失败故障，提出在LCC的控制系统中加入定关断角控制作为故障备用控制，并在定关断角控制启动时在风电场侧整流站加入定直流电压控制来抑制换相失败。在PSCAD仿真软件中模拟海上风电利用混合直流送出电能，仿真结果验证了混合直流输电系统能够跟踪风电场输出的功率变化，在交流侧故障时协调控制策略的转换能够减少换相失败的次数，保证系统恢复正常运行。 |
| 关键词: 风电 高压直流输电 双馈风机 电压源换流器 电网换相换流器 换相失败 |
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| Control of offshore DFIG-based wind farm with hybrid HVDC transmission |
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ZHAI Dongling1, HAN Minxiao1, YAN Wenli1, SUN Xu2
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1.School of Electrical and Electronic Engineering，North China Electric Power University，
Beijing 102206，China;2.Electric Power Research Institute，Beijing 100192，China
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| Abstract: |
| To reduce the cost of offshore wind power sending via VSC-HVDC（Voltage Source Converter- High Voltage Direct Current），a topological design is proposed for the DFIG（Doubly-Fed Induction Generator）-based offshore wind farm：farm-side VSC and inverter-side LCC（Line Commutated Converter）. In order to ensure the stable operation in normal conditions and track the variable wind speed，the farm-side VSC adopts the constant AC voltage and given frequency control while the inverter-side LCC adopts the constant DC voltage control. As the continuous commutation failures may easily occur in the weak power system with fault，the constant extinction angle control is added as a backup control in the LCC control system. When the constant extinction angle control is initiated，the constant DC voltage control is added in the VSC control system to suppress the commutation failure. The offshore wind power sending via VSC-HVDC is simulated with PSCAD／ EMTDC and the simulative results verify that，the hybrid HVDC power transmission system can track the variable power output of wind farm，the conversion of coordination control strategy can reduce the commutation failure times to ensure the system recovery during AC-side fault. |
| Key words: wind power HVDC power transmission DFIG-based wind turbine VSC LCC commutation failure |
