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基于PMU梯度动态偏差的新型电力系统快速稳定性

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在能源转型和科技进步双重推动下，高比例可再生能源和高比例电力电子设备正成为电力系统发展重要趋势和关键特征。新型电力系统动态行为随之发生重大变化，传统小干扰稳定性分析方法满足使用需要，在应对运行工况快速变化场合时尚存在亟需解决问题。提出基于同步相量测量装置(PMU)数据梯度动态偏差李雅普诺夫直接分析法对新型电力系统小干扰稳定性进行分析，利用PMU数据矩阵降维得到低维矩阵，代入含双馈异步风力发电机组的电力系统矩阵模型，求解李雅普诺夫方程式得到对角矩阵，通过判定矩阵正定性对系统稳定性作出判断。利用求解后得到的对角矩阵计算相应状态变量动态偏差值，对相应状态变量曲线使用梯度下降法迭代计算该曲线极值点数值，时间加权计算整个振荡过程时间加权动态偏差量，为阻尼稳定控制器配置位置提供指导。利用含风力发电新英格兰10机39节点系统仿真验证方法可以达到改善系统小干扰稳定性以及对新型电力系统快速稳定性分析的有效性。
Fast Stability of New Power System Based on a PMU Gradient Dynamic Deviation Method
The high proportion of renewable energy and power electronic equipment is emerging as a significant trend and key characteristic of the power system development driven by the dual promotion of the energy transformation and scientific technological advancement.Major modifications have been made to the dynamic behavior of the new power system.The traditional small signal stability analysis approach is difficult to apply,and there are still urgent issues to be resolved for the quick change of operating conditions.In this paper,a Lyapunov direct analysis method of gradient dynamic deviation based on phasor measurement unit(PMU)data is proposed to analyze the small signal stability of the new power system.First,the PMU data matrix is used to reduce the dimension to obtain the low dimension matrix,which is substituted into the power system matrix model with a doubly-fed induction generator(DFIG).The diagonal matrix is obtained by solving the Lyapunov equation,and the positive definiteness of the matrix is determined to judge the system stability.Then,the dynamic deviation of corresponding state variable is calculated by solving the obtained diagonal matrix.The gradient descent method is applied to the corresponding state variable curve to iterate the extreme point value of curve.The time-weighted dynamic deviation of the whole oscillation process is calculated by time weighting,which provides guidance for the subsequent configuration position of damping stability controller,i.e.,power system stabilizer(PSS).The method can improve the small interference stability of the system.The effectiveness of the fast stability analysis of the new power system is verified by simulations of the new England 10-machine 39-bus system with DFIG.

phasor measurement unit(PMU)datanew power systemstability analysisLyapunov direct methodgradient dynamic deviation

于淼、胡敬轩、张寿志、魏静静、孙建群、吴屹潇

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北京建筑大学机电与车辆工程学院,北京 100044

北京市建筑安全检测工程技术研究中心,北京 100044

清华大学电力系统及发电设备安全控制和仿真国家重点实验室,北京 100084

同步相量测量装置数据 新型电力系统 稳定性分析 李雅普诺夫直接法 梯度动态偏差

清华大学电力系统及大型发电设备安全控制与仿真国家重点实验室基金资助项目北京市高等教育学会项目北京建筑大学金字塔人才培养工程项目北京建筑大学研究生创新项目国家级大学生创新创业训练计划项目国家自然科学基金委青年科学基金资助项目

SKLD20M17YB2021131JDYC20200324PG202213220211001605251407201

2024

10.16183/j.cnki.jsjtu.2022.370

上海交通大学学报
上海交通大学

上海交通大学学报

CSTPCD北大核心
影响因子：0.555
ISSN：1008-7095
年,卷(期)：2024.58(1)
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