工业企业配电网中高压APF的研究

发布时间：2018-05-04 20:51

本文选题：中高压 + H桥级联型有源电力滤波器　；参考：《湖南大学》2014年硕士论文

【摘要】：工业企业配电网中电力电子装置的广泛应用带来了电能质量问题，有源电力滤波器由于在无功补偿和谐波抑制方面具有良好的动态性能成为了谐波治理的有效方式。传统的低压有源电力滤波器受功率开关管承受电压等级的限制，无法直接应用于中高压配电网。因此有必要研究应用于中高压配电网的有源滤波器拓扑，调制方法以及控制策略。本文首先分析了变压器低压侧接并联型有源电力滤波器，并联混合型有源电力滤波器以及多电平有源电力滤波器等几类应用于中高压场合的典型拓扑结构，从控制和实用的角度对比了这几类拓扑结构存在的优缺点，选择了三角型连接的H桥级联型有源电力滤波器作为本文研究的内容。接着，研究了适用于H桥级联有源电力滤波器的调制策略，详述了双极性SPWM调制和单极倍频调制原理，从这两种调制策略对单个H桥输出电压和级联叠加输出电压的数学表达式定量分析了基波放大倍数、最低谐波群分布、等效开关频率，并通过仿真验证了理论分析的正确性。从而选择了具有优良谐波特性的半周期移相单极倍频载波SPWM调制策略。然后，针对谐波检测、直流侧稳压控制、电流跟踪控制三方面深入研究了H桥级联型有源电力滤波器的控制策略。介绍了两类常用的谐波检测算法，基于傅立叶级数检测算法和基于瞬时无功功率的检测算法。分析了H桥级联型有源电力滤波器电容电压不平衡机理，提出了总电压控制和电容电压平衡策略。重点研究了无差拍控制和准PR控制两种电流跟踪控制策略设计，深入探讨了准PR参数对跟踪性能和稳态性能的影响，给出了合理的准PR控制参数，仿真结果表明准PR能够实现对指令电流零稳态误差的跟踪，，比无差拍控制具有更好的跟踪性能，更好的谐波抑制效果。最后，对低压单相H桥级联型有源电力滤波器进行了仿真分析，并对低压单相实验平台的主电路、控制电路、软件等实现进行了详述。最后在低压实验平台进行了电流跟踪实验，实验结果证明了硬件电路的合理性和本文所提出的控制策略的有效性。
[Abstract]:The wide application of power electronic devices in industrial distribution network has brought about power quality problems. Active power filter has become an effective way of harmonic treatment because of its good dynamic performance in reactive power compensation and harmonic suppression. The traditional low voltage active power filter (LAPF) can not be directly applied to the medium and high voltage distribution network because of the limitation of the voltage level of the power switch. Therefore, it is necessary to study the topology, modulation method and control strategy of active filter applied in medium and high voltage distribution network. In this paper, the typical topology of transformer low-voltage side-connected shunt active power filter, shunt hybrid active power filter and multi-level active power filter are analyzed. The advantages and disadvantages of these kinds of topologies are compared from the point of view of control and application. The triangular H-bridge cascaded active power filter is chosen as the content of this paper. Then, the modulation strategy suitable for H-bridge cascaded active power filter is studied, and the principles of bipolar SPWM modulation and unipolar frequency-doubling modulation are described in detail. From the mathematical expressions of single H bridge output voltage and cascade superposition output voltage, the fundamental amplifier, the lowest harmonic group distribution and the equivalent switching frequency are quantitatively analyzed by these two modulation strategies, and the correctness of the theoretical analysis is verified by simulation. Thus, the SPWM modulation strategy of semi-periodic phase shift monopole frequency doubling carrier with excellent harmonic characteristics is selected. Then, the control strategy of H-bridge cascaded active power filter is studied in three aspects: harmonic detection, DC side voltage stabilization control and current tracking control. This paper introduces two kinds of harmonic detection algorithms, one is based on Fourier series and the other is based on instantaneous reactive power. The mechanism of capacitance voltage imbalance of H-bridge cascaded active power filter is analyzed, and the strategy of total voltage control and capacitor voltage balance is proposed. Two kinds of current tracking control strategies are studied in detail. The effects of quasi-PR parameters on tracking performance and steady-state performance are discussed, and reasonable quasi-PR control parameters are given. Simulation results show that quasi PR can track zero steady state error of instruction current, which has better tracking performance and better harmonic suppression effect than non beat control. Finally, the simulation analysis of the cascaded low-voltage single-phase H-bridge active power filter is carried out, and the main circuit, control circuit and software implementation of the low-voltage single-phase experimental platform are described in detail. Finally, the current tracking experiment is carried out on the low voltage experimental platform. The experimental results prove the rationality of the hardware circuit and the effectiveness of the control strategy proposed in this paper.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761;TN713.8

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