含有分频输电线路的电力系统稳态特性研究

根据分频输电线路的等值电路，应用谐波平衡原理，建立了含有分频输电线路的电力系统潮流数学模型，并应用牛顿－拉夫逊法进行求解。分析了分频输电系统输送功率与效率、副边无功补偿容量之间的关系，以及分频输电线路在各种载荷下的稳态运行特性和向工频系统注入的谐波电流，并和直流输电线路产生的谐波电流进行了比较。仿真表明，分频输电系统有很宽的谐波电流进行了比较。仿真表明，分频输电系统有很宽的功率运行范围和很好的效率特性及稳态特性，分频输电系统产生的谐波电流很小。

STUDY ON STEADY-STATE PERFORMANCES OF POWER SYSTEM CONTAINING FRACTIONAL FREQUENCY TRANSMISSION LINES

According to the equivalent circuit of fractional frequency transmission line and using the harmonic balance principle, a mathematical model for load flow of power system containing fractional frequency transmission line is established. The Newton Raphson method is adopted in the solution of this model. The relationship among the transmitted power in fractional frequency transmission lines, the transmission efficiency and the reactive compensation capacity at secondary side of transformer are analyzed. The steady state operation of fractional frequency transmission line under different loads is investigated and the harmonic currents induced in fundamental frequency system are compared with that generated in DC transmission line. Simulation shows that fractional frequency transmission system (FFTS) possesses broad operation scope, high efficiency and good steady state performance, the harmonic currents induced by FFTS are small and its influence on fundamental frequency power system is not serious.