限流器对单机无穷大输电系统的稳定性影响

Study of the Effects of Fault Current Limiter on Stability of Transmission System

短路限流器在电力系统中的应用领域不断扩大,由于在输电系统中引入了短路限流器,即使输电系统的输电容量在不断提高,对输电设备短路容量的提升也并不十分明显.本文重点研究了短路限流器接入单机无穷大功率输电系统后,在传输线发生短路时,其等效电路及等效电路中的阻抗值,输电线路中阻抗的变化对输出功率的影响.研究了发生短路时,当短路限流器为纯阻抗、纯电感和R-L型阻抗时,对发电机转速及转角的影响,对发电机功角特性曲线的影响,对发电机无穷大功率母线系统工作稳定性的影响以及限流器自身的有功损耗问题.

With the gradually wide application of short circuit current limiter,although the power transmission capability of power transmission system is continuously growing,the upgrading of the short circuit capacity of the transmission system is not obvious because of the introduction of short circuit current limiter in power system. This paper bases its theories on conditions that the short circuit current limiter is inserted into single machine infinite power system and that the transmission line is short-circuit. And this paper mainly studies influences on output power which are caused by the variation of equivalent circuit of the system previously referred,its impedance value and the impedance of output line.This paper also studies influences on rotational speed and angle,torque-angle curve and working stability of infinite power busbar system of the generator and problems on active loss of short circuit current limiter itself when the system is short-circuit and the short circuit current limiter is impedance pure inductance and R-L typed impedance.