风电场交直流混合输电并网中VSC-HVDC的控制

发布时间：2018-07-31 20:57

【摘要】：为提高风电场交直流混合输电并网的系统性能,提出一种更加灵活的电压源换流器高压直流(voltage source converter based high voltage direct current,VSC-HVDC)控制策略。对于风电场侧电压源换流器,设计了一种新的交流电压功角控制方法。对于交直流混合输电模式,该方法通过调节风电场交流母线电压与电压源换流器输出电压间的功角来实现定有功功率控制。对于纯柔性直流输电模式,风电场交流母线电压自动被调节为具有恒幅恒频的交流电压,实现了对波动风电的同步输送。该方法中输电模式的变化无需切换控制;另外,通过附加电流高通滤波器增强了对系统谐振的阻尼作用。对电网侧电压源换流器,采用一种新的直接电流矢量控制,使直流电压稳定在参考值上。运用PSCAD/EMTDC仿真软件对分别接入笼型感应发电机(squirrel cage induction generator,SCIG)风电场和双馈感应发电机(doubly fed induction generator,DFIG)风电场的交直流混合输电系统建模仿真。一系列运行条件下的仿真结果验证了控制方法的有效性与可行性。
[Abstract]:In order to improve the system performance of AC / DC hybrid transmission grid in wind farm, a more flexible control strategy of HVDC (voltage source converter based high voltage direct currentVSC-HVDC is proposed. A new AC voltage angle control method is designed for wind farm side voltage source converter. For the AC / DC hybrid transmission mode, this method realizes the constant active power control by adjusting the power angle between the AC bus voltage of the wind farm and the output voltage of the voltage source converter. For the pure flexible DC transmission mode, the AC bus voltage of the wind farm is automatically adjusted to the AC voltage with constant amplitude and constant frequency, which realizes the synchronous transmission of fluctuating wind power. In this method, the change of transmission mode does not require switching control; in addition, the damping effect of the system resonance is enhanced by adding a high-pass current filter. A new direct current vector control is used to stabilize the DC voltage on the reference value for the voltage source converter on the power grid side. The modeling and simulation of AC / DC hybrid transmission system connected to cage induction generator (squirrel cage induction generator) wind farm and doubly-fed induction generator (doubly fed induction) wind farm are simulated by PSCAD/EMTDC simulation software. A series of simulation results show the effectiveness and feasibility of the control method.
【作者单位】：华南理工大学电力学院;南方电网科学研究院;
【基金】：国家高技术研究发展计划项目(863计划)(2011AA05A102)~~
【分类号】：TM721.1;TM614

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