考虑采样过程的换流器混杂宽频导纳模型  

Hybrid Broadband Model of Converter Output Admittance With Digital Sampling Process

作　　者：冯麟 马俊鹏 王顺亮 黄河[1] 刘天琪[1] 吴子豪[2] 王若谷[2] FENG Lin;MA Junpeng;WANG Shunliang;HUANG He;LIU Tianqi;WU Zihao;WANG Ruogu(College of Electrical Engineering,Sichuan University,Chengdu 610065,Sichuan Province,China;State Grid Shaanxi Electric Power Research Institute,Xi’an 710099,Shaanxi Province,China)

机构地区：[1]四川大学电气工程学院,四川省成都市610065 [2]国网陕西电力科学研究院,陕西省西安市710099

出　　处：《中国电机工程学报》2022年第16期6017-6027,共11页Proceedings of the CSEE

基　　金：国家电网有限公司总部管理科技项目资助(5400-202099283A-0-0-00)~~。

摘　　要：并网换流器系统中同时具有控制系统的离散特性和被控对象的连续特性,为典型的混杂系统。传统建模方法并未同时兼顾该混杂系统的离散和连续特性,无法精确描述变流器在奈奎斯特频率附近及以上频段的导纳特性。针对该问题,为保证换流器导纳模型在奈奎斯特频率附近及以上频段内的准确性,该文首先采用复矢量建模的方法得到描述并网换流器频率耦合效应的导纳模型;然后,考虑换流器控制系统采样过程,引入泊松求和定理,推导考虑采样过程的换流器复矢量模型;相较连续域的复矢量模型,考虑采样过程的换流器混杂复矢量模型同时兼顾控制系统的离散特性和被控对象的连续特性,在奈奎斯特频率以上仍具有较高准确性。最后,通过仿真及半实物实验验证所提建模理论的准确性。The grid-connected converter with digital controller is a typical hybrid system, which has the discrete nature of digital controller and continuous nature of the plant.However, the discrete and the continuous nature were not taken into account in the conventional modeling approach, which degrades the admittance accuracy of the converter near and above the Nyquist frequency. In this paper, the complex vector modeling was first used to establish the admittance model and reveal the frequency coupling phenomenon of the converter. To increase admittance modeling precision above Nyquist frequency, the Poisson summation rule was introduced to analyze the sampling process of the converter system controller, and the complex vector model of converter with the digital sampling process was elaborated. Compared with the continuous-domain complex vector model, the hybrid complex vector model with the digital sampling process, which takes both the discrete and continuous nature of converter into account, has high precision above Nyquist frequency. Finally, the effectiveness and correctness of the proposed modeling theory are validated by the simulation and hardware in the loop(HIL).

关 键 词：并网换流器 导纳模型 复矢量建模 采样 频率耦合 混杂系统 

分 类 号：TM46[电气工程—电器]