发电厂高效小汽机-风机驱动系统并网冲击电流研究

异步电机调速的小汽机驱动风机系统能够提高小汽机运行效率,增加电厂的售电收益,但是缺少该系统近同步速并网时产生的冲击电流对电网影响的研究。本文针对提到的系统,研究了系统并网产生的冲击电流对电厂电网的影响。通过理论分析、MATLAB计算机仿真以及物理模拟实验,证明了异步电机以近同步速直接并网时,冲击电流持续时间很短,不会因冲击电流对电厂电网造成危害。由此验证了系统的安全可靠性,为系统的生产研发提供了理论依据。

Research on Grid-Connected Impulse Current of High Efficiency Small Steam Turbine Driven System in Power Plant

The small steam turbine driven fan system controlled by induction motor can improve the operation efficiency of small steam turbine and increase the income of electricity sale. But it lacks study on the influence of impulse current on power grid which generated by this system when connecting to the grid at near-synchronous speed. According to the system mentioned above, the influence of the impulse current generated by the system connecting to the grid is studied. Through theoretical analysis, MATLAB simulation and physical simulation experiments, it is improved that when induction motor connects to the grid directly at near-synchronous speed, the impulse current duration is very short, so it will not cause harm to the power plant grid. As a result, the security of the system is proved and theory evidence for research and development is provided.