交直流混联系统联络线功率振荡分析与抑制

发布时间：2018-03-31 07:12

本文选题：交直流混联电力系统　切入点：直流再启动　出处：《高电压技术》2017年05期

【摘要】：在交直流混联电力系统中,直流再启动和直流闭锁会对交流联络线产生不同的冲击,从而影响电网的安全稳定运行。为此,分析了直流再启动和直流闭锁对交流联络线影响的数学机理和不同过程中影响交流联络线功率振荡的因素。结果表明:直流再启动时间越长引发的功率振荡越大,合理配置电力系统稳定器(PSS)可以有效抑制该类型振荡;直流闭锁时功率大范围转移造成的区域阻尼下降是导致交流联络线功率发散振荡的原因,切机与PSS配合对直流闭锁造成的功率振荡有良好的抑制效果;在直流重启动和闭锁的过程中,保证系统稳定的前提下,励磁调节器增益越大,交流联络线功率振荡衰减就越快;水流惯性时间常数对直流再启动造成的功率波动影响不明显,但直流闭锁后,较小的水流惯性时间常数易导致联络线功率等幅振荡。研究结果对于交直流混联系统的运行稳定性具有一定的参考价值。
[Abstract]:In the AC / DC hybrid power system, DC restarting and DC locking will have different impacts on the AC tie line, thus affecting the safe and stable operation of the power grid. The mathematical mechanism of the effect of DC restarting and DC locking on AC tie-line and the factors influencing AC tie-line power oscillation in different processes are analyzed. The results show that the longer the DC restart time, the greater the power oscillation. The reasonable allocation of power system stabilizer (PSS) can effectively suppress this type of oscillation, and the decrease of the regional damping caused by the wide range transfer of power during the DC locking is the cause of the AC tie-line power divergence oscillation. In the process of DC restarting and locking, the larger the gain of excitation regulator, the faster the attenuation of AC tie-line power oscillation. The influence of flow inertia time constant on the power fluctuation caused by DC restarting is not obvious, but after DC locking, The smaller inertial time constant of water flow can easily lead to constant amplitude oscillation of tie-line power. The results of the study have a certain reference value for the stability of AC / DC hybrid system.
【作者单位】：西安理工大学水利水电学院;
【基金】：国家自然科学基金(51379174)~~
【分类号】：TM712

【相似文献】