基于阻尼系数灵敏度的风光电网动态交互分析与稳定提升方法  

Dynamic interaction analysis and stability improvement method for wind/PV integrated power systems based on damping coefficient sensitivity

作　　者：李生虎[1,2] 陈东 叶剑桥 齐楠 徐志雄 LI Shenghu;CHEN Dong;YE Jianqiao;QI Nan;XU Zhixiong(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]新能源利用与节能安徽省重点实验室,安徽合肥230009

出　　处：《电力系统保护与控制》2024年第16期150-161,共12页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51877061)。

摘　　要：风电、光伏与同步发电机(synchronous generator,SG)间动态交互,影响电力系统稳定性。基于阻尼系数灵敏度,研究了风光并网电力系统动态交互过程与稳定提升方法。首先,基于线性化表达验证了风光机组对SG暂态响应存在影响。其次,建立电力系统闭环传递函数模型,分析风光机组与SG间的动态交互过程。新定义风光机组向SG提供阻尼系数,以量化风光并网对电网振荡的影响。然后,提出阻尼系数对风光出力灵敏度的解析表达,作为内点法梯度信息,调整风光出力以改善电网稳定性。最后,仿真验证表明,调节风电(光伏)出力可提高光伏(风电)场站相关危险模式的阻尼,改善电网稳定性。以灵敏度作为梯度信息,可提高优化算法的计算效率与准确性,优化前后功角平均振幅分别为25.1589°、18.0165°。Dynamic interactions among wind power,photovoltaic(PV),and synchronous generators(SG)affect power system stability.The dynamic interaction mechanism and stabilization enhancement method in the wind/PV integrated power system are studied based on the sensitivity of the damping coefficient.First,the impact of the doubly-fed induction generator(DFIG)and PV generators on the transient response to the SG is determined using linearized expression.Secondly,the closed-loop transfer function of the DFIG/PV integrated power system is derived to analyze the dynamic interaction process among the DFIG,PV,and SG.The damping coefficients provided by DFIG and PV to SG are newly derived to quantify the impact of the DFIG/PV on power system oscillation.Then,an analytical expression for the sensitivities of the damping coefficients to the output of the DFIG/PV is proposed.It is used as the gradient information of the interior point method to improve power system stability by adjusting the outputs of the DFIG/PV.Finally,the simulation results verify that adjusting the output of DFIG/PV can improve the damping of dangerous modes of PV/DFIG and the stability of the system.The calculation efficiency and accuracy of the optimization method with sensitivity as gradient information are verified.The average amplitudes of the power angle with and without optimization are 25.1589°and 18.0165°respectively.

关 键 词：风光并网 低频振荡 阻尼转矩 传递函数 灵敏度 

分 类 号：TM712[电气工程—电力系统及自动化] TM61