静止坐标系下变换器电流平衡–内电势运动模型:一种装备电流控制尺度物理化建模方法  

Current-Balancing Driven Internal Voltage Motion Model of Voltage Source Converter in Stationary Frame:A Physical Modeling Method in Current-Control Timescale

作　　者：严亚兵 苗淼[2] 李胜[1] 袁小明[1] 胡家兵[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074 [2]国网青海省电力公司,青海省西宁市810000

出　　处：《中国电机工程学报》2017年第14期3963-3972,共10页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0900104);国家电网公司科技项目(52283015000M);青海省基础研究计划项目(2016-ZJ-767)~~

摘　　要：随着可再生能源与柔性交、直流输电在电力系统中的广泛应用,电力电子变换器的状态运动对所接入系统的电流控制时间尺度动态行为影响日益突出。为揭示电流控制时间尺度下并网变换器在系统动态过程中的装备状态运动规律,提出了一种基于输入/输出电流平衡–内电势运动的装备物理化建模方法。以电压源型变换器(voltage source converter,VSC)为例,推导了静止坐标系下VSC的电流平衡–内电势运动模型。通过对模型变量间物理关系的分析及其物理化描述,可有助于把握装备电流控制时间尺度动态特性及特性对系统动态稳定的影响。基于Matlab/Simulink的时域仿真与样机实验结果验证了模型的准确性和分析的有效性。As renewable generations, flexible AC and DC transmission getting widespread applications in power systems, semiconductor based flexible power conversion devices＇ states motion have more impacts on system dynamics in current-control timescale. To analyze the dynamic issues of power electronics dominated power system in current-control timescale, this paper proposed a current-balancing driven internal voltage motion modeling method. Based on the proposed modeling method, a current-balancing driven internal voltage motion model of voltage source converters （VSCs） was carried out in stationary frame. By analyzing the dynamic relation between the key states and its physical description which is realized by the equivalent of a controlled current source and virtual energy storage, it is able to uncover the VSC dynamic characteristic in current-control timescale, which contributes to the system stability analysis. The Matlab/ Simulink based simulations show the model correctness and analyses effectiveness.

关 键 词：静止坐标系 电流控制时间尺度 电压源型变换器 电流平衡 内电势 

分 类 号：TM46[电气工程—电器]