应对暂态短时功率冲击的接续型频率紧急控制方法  

Method of Continuous Frequency Emergency Control Considering Transient Short-Time Power Shock

作　　者：常海军 刘福锁 吕睿 CHANG Haijun;LIU Fusuo;LÜRui(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,Jiangsu,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),江苏南京211106

出　　处：《电网与清洁能源》2024年第9期81-91,共11页Power System and Clean Energy

基　　金：国家电网有限有限公司总部科技项目(5100-202256014A-1-1-ZN)。

摘　　要：随着新能源及直流的大规模接入,新能源暂态低电压穿越、直流换相失败等冲击引发电网暂态低频风险加剧,单纯基于前馈控制律的现有频率紧急控制模式策略难以制定,且采用的一次性有功总量控制方式极易诱发连锁高频风险。基于前馈控制理论阐述了现有频率紧急控制律及影响因素。分析了高比例新能源接入对现有频率紧急控制的时效、系统参数及控制目标方面的影响。融合前馈和反馈控制优势,提出了融合故障事件触发和响应轨迹驱动的接续型频率紧急控制方法。基于实际电网典型案例进行了仿真验证,结果表明,采用该控制方法能够有效应对短时性功率冲击下传统一次性频率控制方式引发的高低频连锁问题,提升了高比例新能电网频率稳定控制的防御能力。With large-scale access of new energy and DC,the low transient penetration of new energy,DC commutation failures and other shocks aggravate the transient low frequency risk of the power grid.The existing frequency emergency control mode strategy based on feedforward control law is difficult to formulate,and the one-time total active power control mode adopted is easy to induce chain high-frequency risk.Firstly,based on the feedforward control theory,the existing frequency emergency control law and its influencing factors are described.On this basis,The effects of high proportion of new energy access on the existing frequency emergency control timeliness,system parameters and control objectives are analyzed.Finally,combining the advantages of feedforward and feedback control,the method of continuous frequency emergency control is developed by fusing fault event trigger and response trajectory drive.The effectiveness of the proposed control method is verified based on a typical case of actual power grid.

关 键 词：新能源低电压穿越 直流换相失败 短时性功率冲击 频率紧急控制 连锁 

分 类 号：TM7[电气工程—电力系统及自动化]