基于分岔理论的DC-AC变换器稳定性研究  

Research on the stability of DC-AC converter based on bifurcation theory

作　　者：曹娜[1] 朱春华[1] 史文秀[1] 

机构地区：[1]山东科技大学电气与自动化工程学院,山东青岛266590

出　　处：《黑龙江电力》2017年第1期16-19,共4页Heilongjiang Electric Power

摘　　要：为了解决风力发电系统DC-AC变换器控制参数设置不当导致系统不稳定问题,以电流反馈型比例控制单相DC-AC变换器为例,用频闪映射方法建立了风电系统DC-AC变换器的离散迭代模型,根据分岔理论分析不同比例控制参数k下系统的稳定性,通过折叠图数值仿真和PSCAD电路仿真获取了电流的折叠图和时域波形图,从折叠图数值仿真和时域角度证明了推导的DC-AC变换器离散迭代模型和划分的变换器稳定域的正确性。研究结果表明,合理设置变换器比例控制参数k,能够提高风电系统DC-AC变换器的稳定性。In order to solve the problem of instability verter in wind power generation system, the method led by improperly setting control parameter of DC - AC con- of stroboscopic map was used to establish discrete iterative model with the single - phase DC - AC converter of current feedback proportional control as an example. According to the bifurcation theory, stability of the system was analyzed with different proportional control parameter k. Through numerical simulation of folding map and circuit simulation of PSCAD, the folding map and the time - do- main waveform map of the current were obtained. Therefore, the correctness of discrete iterative model of derived DC - AC converter and stability domain of divided converter was proved from the aspect of numerical simulation and time -domain. The research results show that setting the able to improve the stability of the DC - AC converter in proper proportional control parameter k of the converter is the wind power generation system.

关 键 词：单相DC-AC变换器 频闪映射 分岔图 折叠图 PSCAD 时域波形 

分 类 号：TM46[电气工程—电器]