Quick Transient Stability Evaluation Method for Wind-thermal-bundled AC/DC Transmission System

For wind-thermal-bundled power transmission through AC/DC hybrid system, when the proportion of power transmitted by the AC line is high, the transient instability of voltage and power angle is prone to arise after faults, threatening the system's safe operation. In this paper, an evaluation method is proposed to obtain the transient stability of the system quickly. First, the equivalent models of the synchronous generator, the wind turbine, and the HVDC transmission line are established, and the equivalent circuit model of the transmission system is further obtained. Next, the calculation procedure of the quick evaluation method for transient voltage and power angle is elaborated according to the equivalent circuit model of the system. Finally, the effectiveness and accuracy of the proposed evaluation method are verified by comparing it with the result obtained by simulation software.