基于功角轨迹灵敏度的交直流电网振荡抑制优化  

Optimized Oscillation Suppression of the AC/DC Power System Based on Sensitivity of Power Angle Trajectory

作　　者：夏令志[1] 操松元 陶帝文 程洋 李生虎[3] XIA Lingzhi;CAO Songyuan;TAO Diwen;CHENG Yang;LI Shenghu(State Grid Anhui Electric Power Research Institute,Hefei 230022,Anhui,China;State Grid Anhui Electric Power Co.,Ltd.,Hefei 230061,Anhui,China;School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]国网安徽省电力科学研究院,安徽合肥230022 [2]国网安徽省电力有限公司,安徽合肥230061 [3]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《电网与清洁能源》2024年第3期51-59,77,共10页Power System and Clean Energy

基　　金：国家电网有限公司总部科技项目(5500-202320188A-1-1-ZN)。

摘　　要：高压直流线路稳态功率影响交直流互联系统功角稳定性。为抑制同步发电机功角振荡,基于功角轨迹灵敏度,提出对故障前直流功率的优化方法。建立交直流系统轨迹灵敏度解析表达,引入中间变量确定功角和稳态直流功率关系。推导潮流解对稳态直流功率的灵敏度,计算轨迹灵敏度初值。基于时域仿真中网络约束方程,推导含直流变量的不平衡项。以功角差最小为目标,提出稳态直流功率优化模型,采用内点法求解。仿真结果验证了所提算法对功角振荡的抑制效果。The steady-state power of the high voltage direct current(HVDC)line affects the power angle stability of the AC/HVDC power system.To suppress the angular oscillation among synchronous generators,based on the trajectory sensitivity(TS)of the power angle,an optimization method for the power of HVDC before fault is proposed.Firstly,the analytical expression of the TS for the AC/HVDC power system is derived.Secondly,the relationship between the power angle and the steady-state power of HVDC is decided by introducing intermediate variables.In addition,the sensitivities of the power flow solutions to the steady-state power of HVDC are derived and the initial value of the TS is found.Furthermore,based on the equations of network constraints,the imbalance matrix is derived with the variables of HVDC.Finally,aiming to minimize the power angle difference,the optimization model of the steady-state power of HVDC is proposed and solved by the interior point method.The results verify the suppression efficiency of the optimization.

关 键 词：交直流电网 功角振荡抑制 轨迹灵敏度 故障前直流功率 

分 类 号：TM721[电气工程—电力系统及自动化]