天广交直流混合系统输电能力的研究

对我国第一个交直流混合系统－－天广交直流混合系统的输电能力进行的分析研究表明，天广直流输电工程投产后，提高了南方电网的稳定性。由于直流系统的调制功能对交直流并联运行的作用明显强于对交直流分列运行的作用。故交直流并联运行的输电能力相相对较高。同时电风运行条件的变化对对天广交直流输电系统安全稳定运行有明显影响，增中电网动态无功支持能力对提高天广交直流混合系统输电能力有十分重要的作用。

RESEARCH ON TRANSMISSION CAPABILITY OF TIAN-GUANG AC AND DC HYBRID SYSTEM

The research on transmission capability of the first AC and DC hybrid system in China,I. E.,the Tian-Guang AC and DC hybrid system,shows that stability of South China Power System will be improved after Tian-Guang HVDC project is put into operation. The influence of modulation function of DC system on the parallel operation of AC and DC system will be more obvious than that on the separate operation of AC and DC system. Therefore,the transmission capability of parallel operation of AC and DC system will be higher. At the same time the change of operationcondition of power system will remarkably influence the security of Tian-Guan DC system. To increase thetransmission capability of Tian-Guan AC and DC hybrid system,it will be very important to enhance the dynamic support-ing ability of reactive power of the powersystem.