影响特高压大电源输送能力敏感因素探讨

对于传输距离较长的特高压输电系统，系统的输电能力主要受小扰动稳定的限制。大电源特高压外送系统具有传输距离长、送电功率大等特点，其输送能力的问题一直备受关注。基于送端机组特性并将受端系统等效为负荷的单机系统，对系统的等效阻尼系数进行了详细的理论推导，从发电机组以及系统网络这2个方面出发，具体讨论了机、网侧各参数对系统阻尼系数的影响方式。通过在PSASP仿真软件上搭建的实际特高压大电源外送系统的仿真表明：机、网侧参数均能在一定程度上影响阻尼系数，从而对特高压系统输送能力产生影响，验证了理论推导的正确性，为提高特高压输电系统的输送能力提供了理论依据和策略，该结论具有一定的工程应用价值。

Sensitive Factors of Transmission Capacity of UHV Large-Scale Power Supply

For the long-distance UHV transmission system, its transmission capacity is mainly restricted by small disturbance stability. UHV transmission system with large-scale power supply has characteristics of long transfer distance and huge transfer power, whose transmission capacity has always been a concern. Based on the characteristics of sending system, the receiving system was equivalent to single machine system of load, and the equivalent damping coefficient of the system was deduced in detail. The influence of parameters of generator, network on the system＇ s equivalent damping coefficient was discussed, from two aspects of generator and system network. The simulation results of UHV large power transmission system in PSASP indicate that： the parameters of generator or network can influence damping coefficient and thus affect the UHV system transmission capacity. The results also verify the correctness of the theoretical derivation; can provide theoretical basis and policy for the improvement of UHV transmission capacity, which is valuable to engineering application.