【作者】 王云玲；

【导师】 张步涵；

【作者基本信息】 华中科技大学 ， 电力系统及其自动化， 2007， 硕士

【摘要】 随着电能质量重要性的提高和超级电容器储能技术的发展,将超级电容器储能(SCES)技术应用于电能质量的改善具有广阔的前景。本文对基于超级电容器储能的电能质量调节器进行了系统的研究。本文根据系统的功能要求,提出了以超级电容器作为调节器的储能元件的并联型主电路拓扑结构。采用非隔离型Buck-Boost双向DC/DC变换实现直流电压的转换,应用电压源型变换器实现DC/AC变换。该电能质量调节器可以消除电源电压的暂降、不对称和闪变对负载的影响,在不对称负载时抑制负载的负序电流对电源的影响。根据SCES的特性,确定了系统的基本运行原理,即当电源电压暂降时,通过调节调节器输出的有功功率和无功功率来维持负载电压幅值和相位的稳定。建立了调节器DC/AC变换器和DC/DC变换器的数学模型,针对DC/AC变换器研究了一种同步旋转坐标系下的变量解耦和前馈补偿的控制策略,针对DC/DC变换器采用了一种双闭环反馈控制。详细阐述了基于瞬时无功功率理论的软件锁相环的基本原理和结构。对上述基本控制策略进行了扩充,研究了一种滤波方法获得负载电压的正序和负序分量,通过消除负序分量,使其能够实现抑制电源电压不对称和闪变对负载电压、不对称负载下的负序电流对电源的影响。根据本文研究的电能质量调节器系统结构和控制策略搭建了仿真模型,并对仿真参数进行了设计。对系统及其控制方法进行了全面的仿真分析,仿真结果验证了所研究的拓扑结构和控制策略的有效性。更多还原

【Abstract】 With the increasing importance of power quality and continuous development of Supercapacitor technology, it exhibits broad prospect to utilize SCES ( Supercapacitor Energy Storage) for the power quality improvement. In this dissertation, one king of SCES based power quality conditioner is analyzed and studied systematically.Parallel-processing topology of main circuit is determined according to the functional demands of the studied system. In the designed system, SCES is utilized as energy storage component, Non-isolated bidirectional Buck-Boost DC/DC converter is utilized as DC voltage converter component, voltage source converter(VSC) is used to accomplish DC/AC converter. The main function of the system are to eliminate the influences of source voltage sags, asymmetry and flicker on load voltage, and to restrain the influences of unsymmetrical load on supply current. Based on the characteristics of SCES, the operating principle of the system is established. The active power as well as reactive power of the DC/AC converter is regulated to stabilize the load voltage when the source voltage sags occur.The system mathematic model is established, by which the system control strategy with decoupling and feedforward compensation of d/q components under synchronous rotating coordinate system is studied.Software Phased-locked Loop (SPLL) and effect of its restraint on aberrant voltage are discussed.After being extended and modified, the said control method is adapted to other functions of the converter.A simulation platform of the proposed system structure and control method is developed by using Simulink of the Matlab. Simulation results are provided to show effectiveness of the topology and control strategy.更多还原