正负序时变幅频旋转矢量及其在三相静止坐标系上投影瞬时值间关系的特征及仿真分析  

Characteristics and Simulation Analysis of Positive- and Negative-sequence Time-varying Amplitude/Frequency Rotating Vector and Relationship between Instantaneous Values Formed by Projection in Three-phase Stationary Coordinate Reference Frame

作　　者：王巧 袁小明[1,2] WANG Qiao;YUAN Xiaoming(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;CPSS)

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]中国电源学会

出　　处：《电源学报》2024年第4期100-111,共12页Journal of Power Supply

基　　金：国家自然科学基金委–国家电网公司“智能电网联合基金”集成项目(U1866601)。

摘　　要：随着电力电子化并网设备在电力系统中所占比例的大幅增加,电源侧的输出特性明显区别于传统以同步发电机为代表的电源输出特性,电力电子化电力系统故障分析尤其是网络不对称故障分析面临新的挑战。然而现有的故障分析方法基本未认识到设备内电势的时变幅频特征,仅有的基于时变幅频信号提出的时变幅频对称分量法也仅是1组数学化的分解公式,无明确的物理内涵作为方法支撑。针对此,通过分析正/负序时变幅频旋转矢量投影三相瞬时值间关系的特征,诠释了时变幅频对称分量法的物理本质。首先,研究时变幅频内电势旋转矢量的产生机制;然后,基于正/负时变幅频旋转矢量在三相静止坐标系上投影瞬时值特性建立描述各相的旋转相量概念及正/负序三相旋转相量图;最后,基于上述旋转矢量投影等效三相旋转相量的过程建立时变幅频对称分量法的物理内涵,由此将不对称故障点电压等效为正/负序旋转相量,并结合仿真进行分析。分析结果表明,所提故障分析方法为时变幅频内电势激励下网络不对称故障分析提供了基础理论。With a substantial increase in the proportion of power electronic grid-connected devices in a power system,the output characteristics on the power supply side are obviously different from the output characteristics of traditional power supply represented by synchronous generators.The fault analysis of power electronics dominated power systems,especially the network asymmetrical fault analysis,faces new challenges.However,the existing fault analysis methods basically do not realize the time-varying amplitude/frequency characteristics of the devices' internal voltage,and the available time-varying amplitude/frequency symmetrical components method based on time-varying amplitude/frequency signals is just a set of mathematical decomposition formulas without explicit physical connotation as a support.Under this background,the characteristics of the relationship between the three-phase instantaneous values formed by the positive-and negative-sequence time-varying amplitude/frequency rotating vector are analyzed,and the physical nature of time-varying amplitude/frequency symmetrical components method is interpreted.First,the generation mechanism of the time-varying amplitude/frequency internal voltage rotating vector is studied.Then,based on the characteristics of the instantaneous values formed by the projection of the positive-and negative-sequence time-varying amplitude/frequency rotating vector in a three-phase stationary coordinate reference frame,the concept of rotating phasor describing each phase and the three-phase rotating phasor diagram of positive-and negative-sequence are established.Finally,the physical connotation of the time-varying amplitude/frequency symmetrical components method is established based on the process in which the above-mentioned rotating vector projection is equivalent to a three-phase rotating phasor,the voltage at the asymmetrical fault point is equivalent to the positive-and negative-sequence rotating phasor,and simulation analysis is also combined.The proposed fault analysis method p

关 键 词：电力电子化并网设备 正/负序时变幅频旋转矢量 正/负序三相旋转相量 物理本质 不对称故障点电压 

分 类 号：TM713[电气工程—电力系统及自动化]