基于DSP的三相四桥臂有源滤波器的研究
发布时间：2018-11-21 10:19
【摘要】：随着电力电子技术的飞快发展,大量非线性负荷迅速增加,造成电网中低功率因数、谐波、电压波形畸变、电压波动和闪变以及三相不平衡等电能质量问题日益严重。当前,谐波抑制和无功功率补偿已经成为电力电子技术和电力系统等领域面临的重大课题。有源电力滤波器(Active Power Filter, APF)是一种新型的电力电子设备,可以动态地抑制谐波和补偿无功,且具有高度的可控性和快速响应能力。本文以三相四桥臂有源滤波器为研究对象,进行了理论分析、仿真以及实验验证。 首先,本文介绍了电力系统谐波产生的原因、危害及目前较常用的治理方法。随后总结了有源滤波器国内外研究现状、拓扑结构、谐波检测算法和电流控制算法等。相对其它拓扑有源滤波器,三相四桥臂有源滤波器可以更好地补偿电网中的三相不平衡问题,本文选其为研究对象,建立数学模型,为后文的工作奠定了基础。 其次,本文分析了常用的三相四线制实时谐波检测算法的检测原理和特点,进行了仿真分析和比较。仿真分析表明,abc检测算法和ip-iq-0检测算法的检测精度受电网电压畸变影响较小。abc检测算法可以省略多次的矩阵变换,通过构造不同的正交坐标基,可实现特定次谐波及不平衡分量的检测,通过采用改进的PLL,即使在非理想电网电压的情况下,该算法也具有很好的谐波检测效果。 然后,本文结合PI控制器和PR控制器可分别实现无静差地跟踪直、交流参考量的特性,提出了基于αβ坐标系比例-积分-双频谐振(PI-DFR)的控制策略,其具有较强的谐波补偿能力。针对直流侧电压控制策略,采用特定次谐波电流检测方式,有效地减小了负载变化引起的直流侧电压波动。尤其,针对启动过程补偿电流和电压的过冲,通过采用双环软启动的方法削弱了尖端脉冲问题。仿真实验的结果验证了本文控制策略的正确性和有效性。 基于DSP28335芯片,本课题研制了一台220V/20A三相四桥臂有源滤波器样机。实验表明,本文提出的谐波检测算法、电流控制算法和直流侧电容电压控制算法有效可靠,具有较好的工程应用价值。
[Abstract]:With the rapid development of power electronics technology, a large number of nonlinear load increases rapidly, resulting in low power factor, harmonic, voltage waveform distortion, voltage fluctuation and flicker, three-phase imbalance and other power quality problems become increasingly serious. At present, harmonic suppression and reactive power compensation have become an important subject in power electronics and power system. Active power filter (Active Power Filter, APF) is a new type of power electronic equipment, which can dynamically suppress harmonics and compensate reactive power, and has high controllability and fast response ability. In this paper, three-phase four-arm active filter is taken as the research object, theoretical analysis, simulation and experimental verification are carried out. First of all, this paper introduces the cause of harmonic generation in power system, the harm and the common treatment methods. Then, the current situation of active filter, topology, harmonic detection algorithm and current control algorithm are summarized. Compared with other topological active filters, three-phase four-arm active filters can better compensate for the three-phase imbalance problem in the power network. In this paper, we select the three-phase active filters as the research object and establish the mathematical model, which lays a foundation for the later work. Secondly, this paper analyzes the detection principle and characteristics of three-phase four-wire real-time harmonic detection algorithm, and makes simulation analysis and comparison. Simulation results show that the detection accuracy of abc detection algorithm and ip-iq-0 detection algorithm is less affected by grid voltage distortion. Abc detection algorithm can omit multiple matrix transformations and construct different orthogonal coordinate bases. The detection of specific sub-harmonic and unbalanced components can be realized. By using improved PLL, even in the case of non-ideal grid voltage, the algorithm has a good effect of harmonic detection. Then, according to the characteristics that PI controller and PR controller can track straight and AC reference without static error respectively, a control strategy based on 伪 尾 coordinate system proportional integral-dual frequency resonance (PI-DFR) is proposed. It has strong harmonic compensation ability. Aiming at the DC side voltage control strategy, the DC side voltage fluctuation caused by the load change is effectively reduced by using the special subharmonic current detection method. In particular, aiming at the overshoot of current and voltage in the start-up process, the tip pulse problem is weakened by using double loop soft start method. The simulation results show that the proposed control strategy is correct and effective. Based on DSP28335 chip, a prototype of 220V/20A three-phase four-arm active filter is developed. The experiments show that the harmonic detection algorithm, current control algorithm and DC capacitor voltage control algorithm proposed in this paper are effective and reliable, and have good engineering application value.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN713.8;TM761
本文编号：2346685
[Abstract]:With the rapid development of power electronics technology, a large number of nonlinear load increases rapidly, resulting in low power factor, harmonic, voltage waveform distortion, voltage fluctuation and flicker, three-phase imbalance and other power quality problems become increasingly serious. At present, harmonic suppression and reactive power compensation have become an important subject in power electronics and power system. Active power filter (Active Power Filter, APF) is a new type of power electronic equipment, which can dynamically suppress harmonics and compensate reactive power, and has high controllability and fast response ability. In this paper, three-phase four-arm active filter is taken as the research object, theoretical analysis, simulation and experimental verification are carried out. First of all, this paper introduces the cause of harmonic generation in power system, the harm and the common treatment methods. Then, the current situation of active filter, topology, harmonic detection algorithm and current control algorithm are summarized. Compared with other topological active filters, three-phase four-arm active filters can better compensate for the three-phase imbalance problem in the power network. In this paper, we select the three-phase active filters as the research object and establish the mathematical model, which lays a foundation for the later work. Secondly, this paper analyzes the detection principle and characteristics of three-phase four-wire real-time harmonic detection algorithm, and makes simulation analysis and comparison. Simulation results show that the detection accuracy of abc detection algorithm and ip-iq-0 detection algorithm is less affected by grid voltage distortion. Abc detection algorithm can omit multiple matrix transformations and construct different orthogonal coordinate bases. The detection of specific sub-harmonic and unbalanced components can be realized. By using improved PLL, even in the case of non-ideal grid voltage, the algorithm has a good effect of harmonic detection. Then, according to the characteristics that PI controller and PR controller can track straight and AC reference without static error respectively, a control strategy based on 伪 尾 coordinate system proportional integral-dual frequency resonance (PI-DFR) is proposed. It has strong harmonic compensation ability. Aiming at the DC side voltage control strategy, the DC side voltage fluctuation caused by the load change is effectively reduced by using the special subharmonic current detection method. In particular, aiming at the overshoot of current and voltage in the start-up process, the tip pulse problem is weakened by using double loop soft start method. The simulation results show that the proposed control strategy is correct and effective. Based on DSP28335 chip, a prototype of 220V/20A three-phase four-arm active filter is developed. The experiments show that the harmonic detection algorithm, current control algorithm and DC capacitor voltage control algorithm proposed in this paper are effective and reliable, and have good engineering application value.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN713.8;TM761
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