提升距离保护适应性的新能源主动故障控制研究

该文以新能源送出线路为研究对象,通过研究新能源故障控制方法,提升距离保护在新能源电力系统中的适应性。首先,分析过渡电阻和逆变器控制对于距离保护的影响机理。然后,提出新能源故障控制策略,主动调整新能源输出特性,使故障附加阻抗呈纯阻性。接着通过利用有效故障阻抗、测量阻抗及故障附加阻抗在阻抗复平面中的关系,求解有效故障阻抗,以提升距离保护在新能源系统中的耐过渡电阻能力。最后,利用Matlab/Simulink仿真验证所提方法的有效性,为新能源送出线的保护与控制协调配合提供了理论基础。

RESEARCH ON NEW ENERGY ACTIVE FAULT CONTROL TO IMPROVE ADAPTABILITY OF DISTANCE PROTECTION

In this paper, the transmission line is taken as the research object, and the new energy fault control method is studied to improve the adaptability of distance protection in the new energy power system. Firstly, the influence mechanism of fault resistance and inverter control on distance protection is analyzed. Then, a new energy fault control strategy is proposed to adjust the output characteristics of new energy actively so that the fault supplementary impedance is converted to pure resistance. Then, the trigonometric relationship among measured impedance, effective fault impedance and fault supplementary impedance is derived from the impedance complex plane, and the effective fault impedance is obtained, so as to improve the fault resistance capability of distance protection in the new energy system. Finally, MATLAB/Simulink simulation is used to verify the effectiveness of the proposed method, which provides a theoretical basis for the coordination of the protection and control of the new energy transmission line.