考虑电压恢复的风电系统改进分段协调频率控制  

Improved piecewise coordinated frequency control of wind power generation system considering voltage restoration

作　　者：陈阅海 彭乔[1] 刘天琪[1] 古庭赟 张后谊 辛悦 CHEN Yuehai;PENG Qiao;LIU Tianqi;GU Tingyun;ZHANG Houyi;XIN Yue(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;Electric Power Research Institute of Guizhou Power Grid Co.,Ltd,Guiyang 550007,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]贵州电网有限责任公司电力科学研究院,贵州贵阳550007

出　　处：《电力工程技术》2025年第2期160-171,196,共13页Electric Power Engineering Technology

基　　金：贵州省科技支撑计划资助项目“基于云储能架构体系的多调节资源协同控制与主动支撑关键技术研究”(黔科合支撑[2023]一般293)。

摘　　要：大规模风电场及电力电子设备的接入使得电网总惯性降低、频率调节能力下降,因此需要包括风电系统在内的新能源系统提供足够的惯性支撑,以保障频率稳定与安全。风电系统可利用风机转子动能或直流侧电容的静电能为电网提供虚拟惯性。然而,如何协同利用这两种资源以实现资源的优化以及高效的惯性支撑,是当前研究的难点。此外,风电系统直流电容参与提供虚拟惯性可能导致直流电压持续偏离额定值,从而难以应对后续可能出现的扰动,限制了风电系统的持续调频能力。为此,文中提出一种考虑电压恢复的风电系统改进分段协调频率控制方法。首先,构建了考虑风机转子和直流电容提供虚拟惯性的风电系统分段协调频率控制。然后,提出了一种考虑直流电压恢复的新型直流电容虚拟惯性控制,并在此基础上形成了改进的分段协调频率控制方法。最后,通过PSCAD/EMTDC进行仿真分析,结果表明所提出的控制方法不仅实现了直流电容参与提供虚拟惯性,而且能够在不影响风电系统整体惯性支撑能力的前提下快速恢复直流电压。该方法优化了调频资源的利用,提高了风电系统在连续频率扰动下的支撑能力。The large-scale integration of wind farms and power electronic devices reduces the total inertia and frequency regulation capability of power grid.The new energy systems,including wind power generation system,are required to provide sufficient inertia support to ensure the stability and safety of frequency.The wind power generation system can provide virtual inertia to the power grid by applying the kinetic energy of wind turbine rotor or the electrostatic energy of DC capacitor.However,how to coordinate the two sources to achieve optimal utilization of resources and efficient inertia support is the current research difficulty.On the other hand,the participation of DC capacitor of wind power generation system in virtual inertia provision may lead to sustaining deviation of DC voltage from the rated value.It is difficult for the wind power generation system to cope with subsequent possible disturbances,and the continuous frequency regulation capability of wind power generation system is constrained.Therefore,an improved piecewise coordinated frequency control method for wind power generation system considering voltage restoration is proposed.Firstly,a piecewise coordinated frequency control of wind power generation system considering virtual inertia provision from wind turbine rotor and DC capacitor is constructed.Then,a novel virtual inertia control of DC capacitor considering DC voltage restoration is proposed,based on which an improved piecewise coordinated frequency control of wind power generation system considering voltage restoration is developed.Finally,simulation analysis is carried out in PSCAD/EMTDC.The simulation results show that the proposed control method fulfills the participation of DC capacitor in virtual inertia provision,and it can restore the DC voltage rapidly without affecting the inertia support performance of wind power generation system.The proposed method optimizes the use of frequency regulation resources and improves the grid support capability of wind power generation system under cas

关 键 词：风电系统 频率控制 虚拟惯性 直流电容 电压恢复 分段控制 

分 类 号：TM614[电气工程—电力系统及自动化]