模块化三电平有源滤波器控制策略与装置研究
发布时间：2018-08-19 19:07
【摘要】：应用于实际工业中的电力电子装置会对电网产生谐波电流,通常采用有源滤波器抑制这种谐波电流对电网的污染。在高压大功率场合,三电平有源滤波器由于自身结构上的特点比传统两电平有源滤波器应用前景更大。论文以三相三线制的二极管箝位型三电平有源滤波器作为研究对象,研究其关键的控制策略并对相关装置进行软硬件设计。 三电平有源滤波器的数学模型是有源滤波器控制策略设计的基础。本文介绍了三电平有源滤波器的工作原理,推导出在不同控制目标时参考指令电流的构成,基于三电平有源滤波器主电路拓扑结构,建立了三电平有源滤波器在dq坐标系下的数学模型,并推导出系统的交流小信号模型。 三电平SVPWM调制及中点电位平衡控制是保证三电平有源滤波器正常工作的前提。本文米用参考矢量分解的万法,给出了三电平有源滤波器SVPWM的调制算法,分析了三电平各矢量对中点电位的影响,根据电荷平衡原理提出了一种简单的基于时间因子的中点电位平衡控制策略,用以控制直流侧电容电位的不平衡。 电流跟踪制策略是决定三电平有源滤波器补偿效果的关键因素。针对三电平有源滤波器的控制目标,本文根据瞬时无功功率理论,对ip-iq谐波电流检测方法进行了详细分析,以保证参考指令电流提取的快速性和准确性；在三电平有源滤波器数学模型的基础上,推导出三电平有源滤波器的前馈解耦PI控制、参考指令预测电流控制、无差拍控制和滑模控制的控制方程,并对三电平有源滤波器的各种控制策略进行了仿真验证。 模块并联控制策略是三电平有源滤波器实现扩容的核心技术。本文对模块集中控制、模块主从控制和模块分布控制这三种并联控制方式进行了分析,并对模块分布控制的2种方案进行了仿真。 为比较多种电流跟踪控制策略的性能,本文在AppSIM半实物仿真系统上分别搭建前馈解耦PI控制、参考指令预测电流控制、无差拍控制和滑模控制的三电平有源滤波器半实物仿真模型,对实验结果进行对比与分析,归纳每种电流跟踪控制策略的特点；在无差拍电流控制策略下,通过对比是否加入中点电位平衡控制的实验,验证了中点平衡控制的有效性。 本文设计了模块化三电平有源滤波器装置,完成了装置的结构设计和主电路参数设计,基于理论推导及仿真结果选择了直流侧电容参数、交流侧输出滤波器电感参数以及预充电电阻参数；同时还完成了基于DSP+FPGA的控制板设计。最后在实验平台上,完成了基于无差拍控制策略及三电平中点电位平衡控制策略的DSP与FPGA程序,验证了实验硬件平台设计的合理性及控制策略的有效性。
[Abstract]:Power electronic devices used in practical industry will produce harmonic current to the power network. Active power filter is usually used to suppress the harmonic current pollution to the power network. In high-voltage and high-power situations, three-level active filter has more application prospect than traditional two-level active filter because of its own characteristics. In this paper, three-phase three-wire diode clamped three-level active filter is taken as the research object, the key control strategy is studied and the hardware and software of the related device are designed. The mathematical model of three-level active filter is the basis of active filter control strategy design. In this paper, the working principle of three-level active filter is introduced, and the configuration of reference instruction current in different control targets is deduced, based on the main circuit topology of three-level active power filter. The mathematical model of three-level active filter in dq coordinate system is established, and the AC small-signal model of the system is derived. Three-level SVPWM modulation and neutral-point potential balance control are the prerequisites to ensure the normal operation of the three-level active filter. In this paper, the modulation algorithm of three-level active power filter (SVPWM) is presented by using the universal method of reference vector decomposition, and the effect of three-level vector on the neutral point potential is analyzed. According to the principle of charge balance, a simple control strategy of midpoint potential balance based on time factor is proposed to control the unbalance of capacitance potential on the DC side. Current tracking strategy is the key factor to determine the compensation effect of three-level active filter. Aiming at the control target of three-level active power filter, this paper analyzes the harmonic current detection method of ip-iq in detail according to instantaneous reactive power theory, in order to ensure the speed and accuracy of reference instruction current extraction. Based on the mathematical model of three-level active filter, the control equations of feedforward decoupling Pi control, reference instruction predictive current control, deadbeat control and sliding mode control are derived. Various control strategies of three-level active filter are simulated and verified. Modular parallel control strategy is the core technology of three-level active filter expansion. In this paper, three parallel control modes, namely, centralized control, master-slave control and distributed control, are analyzed, and two schemes of distributed control are simulated. In order to compare the performance of various current tracking control strategies, feedforward decoupling Pi control and predictive current control with reference instructions are built in the AppSIM hardware-in-the-loop simulation system. The hardware-in-the-loop simulation model of three-level active filter based on deadbeat control and sliding mode control is compared and analyzed, and the characteristics of each current tracking control strategy are summarized. The effectiveness of the midpoint balance control is verified by comparing whether the midpoint potential balance control is added or not. In this paper, a modularized three-level active filter device is designed, the structure of the device and the main circuit parameters are designed. Based on the theoretical derivation and simulation results, the DC side capacitance parameters are selected. The inductance parameters and precharge resistance parameters of AC side output filter and the design of control board based on DSP FPGA are also completed. Finally, the DSP and FPGA programs based on the non-beat control strategy and the three-level neutral-point potential balance control strategy are completed on the experimental platform, which verifies the rationality of the hardware platform design and the effectiveness of the control strategy.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713.8;TM761
本文编号：2192542
[Abstract]:Power electronic devices used in practical industry will produce harmonic current to the power network. Active power filter is usually used to suppress the harmonic current pollution to the power network. In high-voltage and high-power situations, three-level active filter has more application prospect than traditional two-level active filter because of its own characteristics. In this paper, three-phase three-wire diode clamped three-level active filter is taken as the research object, the key control strategy is studied and the hardware and software of the related device are designed. The mathematical model of three-level active filter is the basis of active filter control strategy design. In this paper, the working principle of three-level active filter is introduced, and the configuration of reference instruction current in different control targets is deduced, based on the main circuit topology of three-level active power filter. The mathematical model of three-level active filter in dq coordinate system is established, and the AC small-signal model of the system is derived. Three-level SVPWM modulation and neutral-point potential balance control are the prerequisites to ensure the normal operation of the three-level active filter. In this paper, the modulation algorithm of three-level active power filter (SVPWM) is presented by using the universal method of reference vector decomposition, and the effect of three-level vector on the neutral point potential is analyzed. According to the principle of charge balance, a simple control strategy of midpoint potential balance based on time factor is proposed to control the unbalance of capacitance potential on the DC side. Current tracking strategy is the key factor to determine the compensation effect of three-level active filter. Aiming at the control target of three-level active power filter, this paper analyzes the harmonic current detection method of ip-iq in detail according to instantaneous reactive power theory, in order to ensure the speed and accuracy of reference instruction current extraction. Based on the mathematical model of three-level active filter, the control equations of feedforward decoupling Pi control, reference instruction predictive current control, deadbeat control and sliding mode control are derived. Various control strategies of three-level active filter are simulated and verified. Modular parallel control strategy is the core technology of three-level active filter expansion. In this paper, three parallel control modes, namely, centralized control, master-slave control and distributed control, are analyzed, and two schemes of distributed control are simulated. In order to compare the performance of various current tracking control strategies, feedforward decoupling Pi control and predictive current control with reference instructions are built in the AppSIM hardware-in-the-loop simulation system. The hardware-in-the-loop simulation model of three-level active filter based on deadbeat control and sliding mode control is compared and analyzed, and the characteristics of each current tracking control strategy are summarized. The effectiveness of the midpoint balance control is verified by comparing whether the midpoint potential balance control is added or not. In this paper, a modularized three-level active filter device is designed, the structure of the device and the main circuit parameters are designed. Based on the theoretical derivation and simulation results, the DC side capacitance parameters are selected. The inductance parameters and precharge resistance parameters of AC side output filter and the design of control board based on DSP FPGA are also completed. Finally, the DSP and FPGA programs based on the non-beat control strategy and the three-level neutral-point potential balance control strategy are completed on the experimental platform, which verifies the rationality of the hardware platform design and the effectiveness of the control strategy.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713.8;TM761
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