基于PR控制的二极管钳位三电平有源电力滤波器的研究
发布时间：2018-08-20 11:32
【摘要】：随着工业现代化的深入发展,各种非线性负荷的使用方便了人们的生产与生活,但同时大量谐波电流源的引入对配电网电能质量造成了非常严重的影响。并联型有源电力滤波器作为一种电力电子装置,能够在消除电网谐波电流的同时补偿无功功率。特别地,基于多电平技术的有源电力滤波器具有开关频率低、适合高压大容量场所等优点,成为当前研究的热点。本文研究分析基于二极管钳位式三电平有源电力滤波器的几个关键技术,包括开关器件调制策略、谐波检测算法、锁相环技术和电流跟踪控制。论文首先分析了二极管钳位式三电平有源电力滤波器的基本工作原理和调制策略,根据拓扑结构和开关相量组合分析中性点电压不平衡的原因,介绍两种消除中性点电压不平衡的方法。接着通过基于瞬时无功功率理论的分析,论文介绍了有源电力滤波器谐波检测方法主要包含两种,p-q法只适用于电网电压平衡条件下,而ip-iq法可以适用于电网电压畸变的情况。然后阐述了SSRF-SPLL、DDSRF-SPLL两种软件锁相环方法,建立数学模型,通过仿真验证了DDSRF-SPLL对电网电压不平衡具有很强的适应性。最后论文建立了三电平APF数学模型,分析了PI控制策略与PR控制策略,PR控制器能做到电流无静差跟踪,也不受电网电压的扰动作用,构建双环控制系统,仿真结果表明了其有效性。
[Abstract]:With the further development of industrial modernization, the use of various nonlinear loads facilitates people's production and life, but at the same time, the introduction of a large number of harmonic current sources has a very serious impact on the power quality of distribution network. As a kind of power electronic device, shunt active power filter can compensate reactive power while eliminating harmonic current. In particular, the active power filter based on multilevel technology has the advantages of low switching frequency and suitable for high voltage and large capacity. In this paper, several key technologies of diode clamped three-level active power filter are studied and analyzed, including switching device modulation strategy, harmonic detection algorithm, phase-locked loop technology and current tracking control. In this paper, the basic principle and modulation strategy of diode clamped three-level active power filter are analyzed, and the reason of neutral voltage imbalance is analyzed according to topology and switch phasor combination. Two methods to eliminate neutral voltage imbalance are introduced. Then, based on the analysis of instantaneous reactive power theory, this paper introduces that the harmonic detection method of active power filter mainly includes two kinds of p-q method, which can only be used in the condition of voltage balance, while ip-iq method can be used in the case of voltage distortion. Then two kinds of software phase-locked loop (PLL) methods of SSRF-SPLL DDSRF-SPLL are described and the mathematical model is established. The simulation results show that DDSRF-SPLL has a strong adaptability to the voltage imbalance of the power network. Finally, a three-level APF mathematical model is established, and the Pi control strategy and PR control strategy are analyzed. The PR controller can achieve no static error tracking of current, and can not be disturbed by the voltage of the power network. A double-loop control system is constructed. Simulation results show its effectiveness.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713;TM761
[Abstract]:With the further development of industrial modernization, the use of various nonlinear loads facilitates people's production and life, but at the same time, the introduction of a large number of harmonic current sources has a very serious impact on the power quality of distribution network. As a kind of power electronic device, shunt active power filter can compensate reactive power while eliminating harmonic current. In particular, the active power filter based on multilevel technology has the advantages of low switching frequency and suitable for high voltage and large capacity. In this paper, several key technologies of diode clamped three-level active power filter are studied and analyzed, including switching device modulation strategy, harmonic detection algorithm, phase-locked loop technology and current tracking control. In this paper, the basic principle and modulation strategy of diode clamped three-level active power filter are analyzed, and the reason of neutral voltage imbalance is analyzed according to topology and switch phasor combination. Two methods to eliminate neutral voltage imbalance are introduced. Then, based on the analysis of instantaneous reactive power theory, this paper introduces that the harmonic detection method of active power filter mainly includes two kinds of p-q method, which can only be used in the condition of voltage balance, while ip-iq method can be used in the case of voltage distortion. Then two kinds of software phase-locked loop (PLL) methods of SSRF-SPLL DDSRF-SPLL are described and the mathematical model is established. The simulation results show that DDSRF-SPLL has a strong adaptability to the voltage imbalance of the power network. Finally, a three-level APF mathematical model is established, and the Pi control strategy and PR control strategy are analyzed. The PR controller can achieve no static error tracking of current, and can not be disturbed by the voltage of the power network. A double-loop control system is constructed. Simulation results show its effectiveness.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713;TM761
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