【作者】 饶芹飞；

【导师】 钟彦儒； 张辉；

【作者基本信息】 西安理工大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 电能质量问题,尤其是无功功率和谐波的问题,严重威胁着电网的安全运行。静止同步补偿器(DSTATCOM),作为新一代无功功率补偿装置,它以其平滑的无功调节、快速的动态特性等优良性能能引起了国内外科研与工程领域的广泛关注。基于现有的稳态数学模型,本文在abc坐标系和dq旋转坐标系下分析DSTATCOM的动态数学模型,在此基础上重点探讨了基于旋转坐标系下的PI调节直接电流控制和预测电流控制策略,并对这两种控制方法的性能进行了比较研究,最后给出仿真和实验结果。结果验证了两种方法均可以实现较好的直流侧电压和交流侧电流的控制,并且在无功给定模式切换情况下仍能达到较好的稳态效果。同时本文在理论分析和仿真的基础上探讨了主电路参数的选取方法及连接电感和直流电容的变化对系统性能的影响,虽然这些参数值的选取都有一个较大的范围,参数选取没有统一的准则,但是要能够使DSTATCOM装置稳定运行,得到最佳补偿效果,就必须结合理论、根据实际情况,通过大量的实验和仿真分析得到比较恰当的参数。本文搭建了一台基于IPM和DSP的±5Kvar的DSTATCOM实验装置,并进行实验研究,实验结果表明:本系统采用的两种直接电流控制方法均可以实现较好的直流侧电压和交流侧电流的控制,稳态性能良好。更多还原

【Abstract】 The problem of electric energy quality menaces seriously the safeoperation of the power network, especially reactive power and harmonics. As a new Var compensator, the Static Synchronous compenator (DSTATCOM) attracts extensive attention for its perfect performance such as smooth regulation of Var and dynamic capability. And Some general control strategy and are researched and their dynamic performance are studied through the Digital simulation. A novel method is proposed to imprve results of inverse-system PI control strategy, and Simulation results are provided to illustrate the merits of method.In this thesis, Furthermore, the equivalent circuit and dynamic model of its main structure are built,with dynamic characteristics analyzing on a-b-c coordinate and d-q coordinate respectively. Above researches found a basis for control and realization. At the same time analysis and comparison have been carried on the electric current decoupled control algorithm. The thesis analyse several more important systematic parameters in StatCom device combining with the theory. Some suggestions for the proper selection of parameters are proposed such as equivalence reactance, equivalence resistance, electric capacity of energy storage of dc side. The test result indicates that the electric current decoupled control algorithm can make the PWM rectification system have fine dynamic and static characters. After the simplification of electric current decoupled control algorithm, the control precision of rectifier is not affected but the algorithm is liable to be realized and adjusted.At last,±5KVar experimental prototypes of AC power supplies of multiple-loop analog and digital control system have been made. Fast dynamic response and load compatibility have been verified by the experiment of step change in the load and under rated full-wave diode bridge rectifier load.更多还原