高风电渗透下电网调峰运行时的频率稳定控制策略研究  

Research on frequency stability control strategy of power grid peak shaving operation under high wind power penetration

作　　者：郭良杰 王德林[1] 谢棚 牛景瑶 喻心 孙超 GUO Liangjie;WANG Delin;XIE Peng;NIU Jingyao;YU Xin;SUN Chao(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,四川成都611756

出　　处：《热力发电》2022年第10期103-113,共11页Thermal Power Generation

基　　金：国家自然科学基金项目(51777176)。

摘　　要：随着可再生能源接入电网的规模不断扩大,传统火电机组逐渐被可再生能源所代替,导致电力系统在新能源高渗透率的情况下抵抗负荷扰动的频率性能较差。针对大规模风电并网下电力系统调峰运行过程中的频率稳定问题展开研究,分析得出系统在启停调峰和深度调峰方式下的频率调节能力较弱。首先,对传统AGC系统频率模型进行改进,提出了计及可再生能源渗透率、调速器死区和发电速率约束的频率响应模型;其次,基于频率响应模型,研究了在不同风电渗透率下系统调峰运行时的频率调节性能;最后,基于2种典型的火电机组调峰方式,在考虑风电功率波动的2区域电力系统中进行仿真验证。仿真结果表明,电力系统在深度调峰时抵抗负荷扰动的能力相对启停调峰时更强。在此基础上,结合改进的风机综合惯性控制策略,有效提高了电网调峰运行时的频率调节性能,解决了电力系统调峰运行时的频率稳定问题。With the continuous expansion of renewable energy’s integration to power grid,conventional thermal power units are gradually replaced by renewable energy power units,resulting in poor frequency characteristics of power system against load disturbance under the condition of high-penetration new energy.Focusing on the frequency stability of power system peak-shaving operation under large-scale wind power grid connection,this paper draws a conclusion that the frequency regulation ability of the system is weak during start-stop peak shaving and deep peak shaving.To solve this problem,firstly,the conventional AGC system frequency model is improved,and the frequency response model considering renewable energy permeability,governor deadband and generation rate constraints is proposed.Then,based on the frequency response model,the frequency regulation performance of the system during peak-shaving at different wind power permeabilities is studied.Finally,based on two typical peak-shaving modes of thermal power units,the simulation is carried out within the two-area power system considering the fluctuation of wind power.The simulation results show that,the ability of power system to resist load disturbance in deep peak-shaving is stronger than that in start-stop peak-shaving.On this basis,combined with the improved fan integrated inertia control strategy,the frequency regulation performance of power grid peakshaving operation is effectively improved,and the problem of frequency stability of power system peak-shaving operation is solved.

关 键 词：深度调峰 启停调峰 火电机组 风电渗透率 频率稳定控制 

分 类 号：TM761[电气工程—电力系统及自动化]