风火捆绑经HVDC送电引起轴系扭振研究

发布时间：2018-06-04 13:54

本文选题：高压直流输电 + 风机轴系模型　；参考：《电工技术学报》2017年06期

【摘要】：风机轴系考虑为多质块模型时,风电场经高压直流输送电力有可能引起次同步轴系扭振。当风电与附近火电机组捆绑送电时,有助于提高风电系统稳定性。但当系统发生扰动时,风电机组和火电机组均将产生严重的轴系扭振现象。本文首先分析风机轴系扭振产生机理,然后基于整体最小二乘-旋转不变技术估计信号参数(TLS-ESPRIT)辨识出在风机轴系和汽轮机轴系固有扭振模态下的系统传递函数,进而基于射影定理针对每个扭振模态设计阻尼控制器以实现分层控制,最后将阻尼控制器输出信号叠加到直流输电整流侧定电流主控制器上,实现轴系扭振的抑制。建立风电场与火电机组捆绑送电模型并进行仿真,仿真结果表明,设计的分层控制器可有效提高轴系固有扭振模态的阻尼比,可使轴系模块间的扭振迅速衰减,有效提高了电力系统稳定性,控制器阶数较低,便于实际工程实现,且具有较高的鲁棒性。
[Abstract]:When the fan shafting system is considered as a multi-mass block model, the wind farm may cause torsional vibration of sub-synchronous shafting through HVDC transmission. When the wind power is bundled with nearby thermal power units, the stability of the wind power system can be improved. However, when the system is disturbed, both wind turbine and thermal power unit will produce severe shafting torsional vibration. In this paper, the mechanism of torsional vibration of fan shafting is analyzed at first, and then the system transfer function under the inherent torsional vibration mode of fan shafting and turbine shafting is identified based on the estimation of signal parameters (TLS-ESPRIT) based on the integral least squares and rotation invariant technique. Based on the projective theorem, a damping controller is designed for each torsional vibration mode to achieve hierarchical control. Finally, the output signal of the damping controller is superimposed on the main controller of fixed current on the rectifier side of HVDC transmission, which can suppress the torsional vibration of the shaft system. The simulation results show that the designed hierarchical controller can effectively improve the damping ratio of the inherent torsional vibration mode of the shafting system, and make the torsional vibration between the shafting modules rapidly attenuate. The stability of power system is improved effectively, the order of controller is lower, it is easy to be realized in practical engineering, and it has high robustness.
【作者单位】：国网山东省电力公司电力科学研究院;
【分类号】：TM712;TM61

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