基于能量函数的光伏发电改善系统阻尼控制策略  

PV Power Control Strategy for Improving System Damping Based on Energy Function

作　　者：吴霞[1] 刘天琪[1] 李兴源[1] 程道卫[2] 

机构地区：[1]四川大学电气信息学院,成都610065 [2]合肥供电局,合肥230022

出　　处：《华东电力》2013年第6期1165-1169,共5页East China Electric Power

基　　金：国家自然科学基金项目(51037003)~~

摘　　要：基于光伏发电数学模型并考虑日照强度的波动性,利用PSCAD建立了光伏阵列与最大功率点跟踪(MPPT)的仿真模型。通过TLS算法辨识同步发电机功角曲线,研究光伏电源接入对系统阻尼的影响。从能量角度分析系统振荡过程中机械功率及各能量变化与系统阻尼的关系,在此基础上,提出在光伏并网逆变器中引入考虑时延的附加有功功率控制以改善系统阻尼,对附加控制引入前后的系统进行扰动仿真,并进行特征值分析。2种仿真结果表明,引入附加控制后发电机功角、转子转速能快速恢复稳定,系统阻尼明显改善。Based on the mathematical model for PV power generation and considering solar intensity fluctuations, this paper establishes a PV array and Maximum Power Point Tracking（MPPT） simulation model in the PSCAD. Then the effect of PV power integration on power system damping is studied by using TLS algorithm to identify synchronous gener- ator power angle curve. The relationship between mechanical power variation, the change of energy and system damping during system oscillations is analyzed using energy functions, thereupon, it proposes to add active power control considering time delay to g^d-conneeted PV inverter in order to improve system damping, simulate the system with disturbances before and after the additional control, and analyze the eigenvalue. Two simulation results show that generator power angle and ro- tor speed can quickly restore stability with additional control, and the system damping is significantly improved.

关 键 词：光伏发电 系统阻尼 能量函数 附加控制 

分 类 号：TM712[电气工程—电力系统及自动化] TM615