摘要
风电高比例接入的电网在受扰后常规机组调频尚未启动的惯量响应阶段内调频资源匮乏,风电场可采用转子动能控制方式快速调整有功功率为电网提供频率支撑,且不影响风电场正常运行。同时,为便于电网侧制定调控策略,需在线评估各风电场的暂态有功支撑能力。以双馈风机为例,构建了考虑风机转速、轴系及逆变器安全限制的风电场暂态有功支撑能力优化模型,并针对模型约束需迭代计算引起的高复杂度,提出采用差分离散化等方法将模型转化为混合整数线性规划问题进行高效求解。同时考虑风速不确定性,提出采用核密度估计与拉丁超立方抽样对风速预测误差进行建模与采样,获取不确定条件下的评估结果。最后,以某实际风电场为例,说明了所提方法的有效性。
For a power grid integrated with high proportion of wind power,the frequency regulation resources are insufficient in the inertia response stage when the frequency regulation of conventional units has not been started after the system is disturbed.The wind farm can quickly adjust the active power by using the rotor kinetic energy control mode to provide frequency support for the power grid without affecting the normal operation of the wind farm.At the same time,in order to formulate the regulation and control strategies at the grid side,it is necessary for each wind farm to evaluate its transient active power support capability online.Taking the doubly-fed wind turbine as an example,an optimal model for the transient active power support capability of the wind farm is proposed considering the safety constrains of the wind turbine speed,shafting and inverter.Aiming at the high complexity caused by the model constraints which require iterative calculations,a difference discretization method is proposed to transform the model into a mixed-integer linear programming problem for efficient solution.Besides,considering the wind speed uncertainty,the kernel density estimation and Latin hypercube sampling are proposed to model and sample the prediction error of the wind speed,so as to obtain the evaluation results under uncertain conditions.Finally,an actual wind farm is taken as an example to illustrate the effectiveness of the proposed method.
作者
董昱
孙荣富
丁然
冯帅帅
起盼
吴林林
DONG Yu;SUN Rongfu;DING Ran;FENG Shuaishuai;QI Pan;WU Linlin(National Power Dispatching and Control Center,State Grid Corporation of China,Beijing 100031,China;State Grid Jibei Electric Power Company Limited,Beijing 100054,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China;Electric Power Research Institute of State Grid Jibei Electric Power Co.,Ltd.,Beijing 100045,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2023年第18期101-110,共10页
Automation of Electric Power Systems
基金
国家电网有限公司总部管理科技项目(4000-202114064A-0-0-00)。
关键词
风电场
暂态有功
在线评估
混合整数线性规划
风速不确定性
惯量响应阶段
wind farm
transient active power
online evaluation
mixed integer linear programming
wind speed uncertainty
inertial response period