摘要
为了使采用双馈式异步电机的风力发电并网系统具备参与电网一次调频的能力,需要对并网系统开展一次调频性能研究,采用下垂控制方案,解耦有功功率和无功功率,通过控制有功功率输出来动态响应频率波动。针对传统下垂控制在响应电网频率调节过程中,输出功率与参考功率偏差较大引起的控制系统过度调整问题,引入动态下垂系数作为原下垂控制系数负反馈相,使频率与下垂控制系数的乘积在可控范围内变换,实现下垂系数根据目标频率实时调节;针对风机并网系统一次调频过程中的功率震荡问题,建立风电并网虚拟同步机数学模型,采用自适应虚拟参数,并分析参数取值范围。通过Matlab/Simulink仿真和实验验证所提方案可以使风电并网系统一次调频控制性能更优。
In order to make the grid connected wind power system with doubly fed induction motor have the ability to participate in the primary frequency regulation of power grid,it is necessary to study the primary frequency regulation performance of the grid connected system,adopt the droop control scheme,decouple the active power and reactive power,and control the dynamic response frequency fluctuation of the active power output.Aiming at the problem of excessive adjustment of control system caused by the large deviation between output power and reference power in response to grid frequency regulation by traditional droop control,the dynamic droop coefficient was introduced as the negative feedback phase of the original droop control coefficient,so that the product of the frequency and the droop control coefficient can be transformed within the controllable range to realize the real-time adjustment of the droop coefficient according to the target frequency;in view of the work in the primary frequency regulation process of the fan grid connected system for the problem of power oscillation,the mathematical model of wind power grid connected virtual synchronous machine was established,the adaptive virtual parameters were adopted,and the range of parameters was analyzed.Through Matlab/Simulink and experimental verification,the scheme proposed can make the primary frequency control performance of wind power grid connected system better.
作者
夏祥武
田梦瑶
XIA Xiangwu;TIAN Mengyao(Institute of Electric Power Engineering,Shanghai University of Electric Power,Shanghai 200090,China;China Coal Technology and Engineering Group Shanghai Research Institute,Shanghai 200030,China)
出处
《电气传动》
2021年第5期70-75,共6页
Electric Drive
基金
上海市科委项目(18DZ1203200)
上海绿色能源并网工程技术研究中心项目(13DZ2251900)。
关键词
风电并网系统
一次调频
非线性下垂控制
自适应虚拟惯量
wind power grid-connected system
primary frequency modulation
nonlinear droop control
adaptive virtual inertia
