新型直流紧急功率控制方案

A novel HVDC emergency power control strategy

当华中华北互联电力系统遭受区域内功率扰动冲击时,特高压长南线功率会发生剧烈波动,给互联系统的安全稳定运行造成巨大威胁。晋北—南京±800kV特高压直流输电工程的投入使用,不仅可以促进山西地区能源的高效利用开发,还可为特高压长南线功率波动抑制提供有效支持。为此,提出一种新型的直流紧急功率控制方案,该方案可根据不同程度特高压长南线功率波动情况,进行实时紧急功率调制;针对华中—华北互联电力系统进行仿真分析与功能测试,评估该控制方案投入后,对特高压长南线功率波动,以及对互联系统暂态稳定性和特高压长南线输电能力的影响。相对于传统方案,该方法具备更好的实用性与适应性。

When the inter-connected power grid is effected by power disturbance impact,the Changzhi-Nanyang UHV transmission line power fluctuation could be extremely severe,which might threaten the safe and stable operation of the inter-connected power grid.After the Jinbei-Nanjing±800 kV UHVDC putting into operation,the energy resources in Shanxi province can be fully developed.Besides,the UHVDC can also provide effective support to the power fluctuation suppression on the UHV transmission line.Thus,A novel HVDC emergency power control strategy was proposed in this paper.According to the power fluctuation on UHV transmission line,it can generate an appropriate power modulation.Based on central and north China inter-connected power grid,the performances of power fluctuation suppression,transient stability improvement and transmission capability enhancement are assessed after used the control strategy.Compared to the traditional scheme,the proposed scheme is with better simplicity and practicality.