【作者】 欧剑波；

【导师】 罗安；

【作者基本信息】 湖南大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 人类社会已进入信息时代,要求作为信息基础的电力供应具有高可靠性和高动态品质。用户电力技术是电力系统研究的新领域,是未来提高配电网电能质量的有效手段。配电静止同步补偿器(Distribution Static Synchronous Compensator, DSTATCOM)作为一种重要的并联型用户电力设备,在理论上能替代常规的电压和无功控制元件,具有功能强大、响应速度快等特点,是现阶段配电网无功补偿和电能质量控制的发展方向之一。论文立足于DSTATCOM实验平台的研制,对DSTATCOM用于负荷侧无功及负序电流补偿的控制策略、检测及控制方法等理论和关键技术进行了研究。论文首先结合DSTATCOM的单相等效电路,阐述了DSTATCOM补偿无功功率的基本原理。在此基础上,为实现DSTATCOM对负荷侧无功及负序电流动态补偿的目标,论文提出了分序控制方法,即把对负荷侧无功的补偿和对负序电流的补偿分开进行控制,其中正序控制环用来实现对负荷侧无功的补偿,负序控制环用来实现对负荷侧负序电流的补偿。为实现分序控制的目标,需准确检测出补偿信号,论文采用正序dq坐标变换将正序基波无功电流转换为正序dq坐标系中的直流分量;采用负序dq坐标变换将基波负序分量转换成负序dq坐标系中的两个直流分量。为验证分序控制方法的有效性,论文搭建起基于MATLAB6.5的DSTATCOM仿真模型进行了数字仿真。仿真结果表明基于分序控制方法的DSTATCOM装置能较好的实现对负荷侧无功及负序电流的动态补偿。在上述理论和技术的指导下,课题组成功开发了基于TMS320LF2407A型DSP控制器的±50kvar的DSTATCOM实验平台装置。论文对DSTATCOM实验平台的软、硬件设计进行了详细的介绍,并分析了其中一些重要参数、模块的设计原理。实验平台研制成功后,课题组在实验平台上进行了相关实验,实验结果表明上述理论和技术是可行的、有效的。更多还原

【Abstract】 High power supply quality, which is characterized by higher reliability and higher dynamic quality, is demanded in the information age. Custom Power technology, which is a new area of research in power system, will be an effective way to improve the power quality of distribution network in the future. Distribution Static Synchronous Compensator (DSTATCOM), which can replace conventional voltage and reactive power control device and is more powerful and fast, is an important Custom Power device. Based on the development of the DSTATCOM experimental platform, control strategy, detection and control methods and key technology for reactive power compensation and negative sequence current compensation were studied.With the single-phase equivalent circuit of DSTATCOM, the basic tenet of reactive power compensation was expounded first of all. In order to achieve the objectives of reactive power compensation and negative sequence current compensation, the dividing-sequence control method was proposed. In such method, the aim of reactive power compensation was achieved in positive sequence control loop, while the objective of negative sequence current compensation was achieved in negative sequence control loop. Compensation signals were obtained by positive sequence and negative sequence dq transformations.To verify the validly of the proposed control method, the DSTATCOM simulation model based on MATLAB6.5 was built. Simulation results show that the DSTATCOM based on the proposed control method can achieve the objectives of reactive power compensation and negative sequence current compensation.Based on the above theory and technology, a±50kvar DSTATCOM experimental platform based on DSP (TMS320LF2407A) controller was developed. Software and hardware design of the DSTATCOM was expatiated in the paper. Related experiments were implemented on the DSTATCOM experimental platform. The effective of the theories were verified by the experimental results.更多还原