【作者】 赵小英；

【导师】 王平；

【作者基本信息】 中国科学院研究生院（电工研究所） ， 电力电子与电力传动， 2005， 硕士

【摘要】 随着电力电子装置的广泛应用,电力系统的无功及谐波问题日趋严重。传统的无功补偿及谐波抑制方法已难以满足现代电力系统的需要。作为一种新型的补偿装置,有源电力滤波器以其对电网负载、系统参数变化的自适应能力和较高的反应速度被认为是目前最具发展潜力的无功和谐波补偿方法。本文详细阐述了并联型有源电力滤波系统的工作原理、系统结构,并对现有谐波检测方法、控制技术进行了系统的分析。基于瞬时无功功率理论的谐波电流检测算法是目前应用最为广泛的检测方法,文中建立了ip、iq 运算方式的仿真模型,分析了低通滤波器对谐波检测效果的影响。本文借助ip、iq 运算方式中的相关概念,结合传统的三角波比较的控制方式,提出一种改进的三角波控制策略。该方法采用双闭环的数字PI控制,在α–β坐标下对瞬时有功电流icp 和瞬时无功电流icq 进行控制,以达到补偿电流实时跟踪指令电流信号变化的目的。与对三相反馈电流直接进行控制的传统三角波比较方式相比,该方法可以实现对三相电流的解耦控制,简化了控制过程。仿真结果证明了该方法的有效性。为验证上述算法,本文完成了一个容量为5kVA 并联型有源电力滤波器实验系统的设计,采用TMS320LF2407A DSP 芯片构成系统控制电路的核心,利用汇编语言进行了程序编制。本文提出采用软件方法实现电压过零点检测、数字低通滤波等功能,使系统的硬件结构得到简化,也提高了系统的稳定性和可靠性。实验结果验证了该硬件电路和控制算法的有效性,为有源电力滤波器的实际工程应用提供了理论依据和实验依据。更多还原

【Abstract】 The substantial increase in the use of power electronic equipment results in harmonic pollution and reactive burden above the tolerable limits. Many conventional solutions to the power quality issues can’t meet the conditions of modern power system. Active power filters are known as a dynamic, adjustable and potential solution to the power quality problems. This paper presents the operation principle and configuration of a shunt active power filter in detail, and analyzes the harmonic detecting methods and control strategies systematically. Currently harmonic detection method based on instantaneous reactive power theory has been widely used. Here a simulation model for ip-iq method is presented and the low-pass filter is analyzed. This paper presents an improved current controller that combines the instantaneous active and reactive current component ip-iq method and the sine-triangle PWM voltage modulation. In the α–βreference frame, instantaneous active and reactive currents are respectively controlled with a proportional integral (PI) regulator and then the true compensating currents can track the harmonic signals well. Compared with the conventional control method whose control objects are three-phase feedback currents, the improved current controller can realize decoupling control. Simulation results verify the validity of the proposed controller. To verify the proposed algorithm, this paper designs an experimental system for a 5-kVA shunt active power filter in which the control circuit is realized using digital signal processor TMS320LF2407A. In the assembly language program, cross-zero compare and digital low-pass filter is realized更多还原