二极管箝位多电平有源电力滤波器及其控制系统研究
发布时间：2019-05-20 08:04
【摘要】：有源电力滤波器是柔性交流输电系统中的一种重要装置,其主电路采用电力电子变换器结构,可快速响应负载电流的变化,实时补偿谐波电流和无功电流,有效抑制电流尖峰及其在其它设备上造成的过压过流现象,是解决供电系统中谐波畸变、提高电能质量的技术装备。目前,受限于电力电子器件的电压电流容量,高压大容量有源电力滤波器的研究与应用还较少,多电平有源电力滤波器的研究处于起步阶段。基于二极管箝位多电平主电路结构的变换器的容量和电压等级可以较传统的两电平结构成倍提高,极大地拓展了该拓扑结构在高压大容量电能变换领域的应用范围,成为当前电力电子技术及其应用的研究热点之一。在此背景下,本文就有源滤波系统中二极管箝位多电平变换器的结构、工作原理及其控制等方面进行了研究,主要研究工作如下：(1)分析了多电平主电路结构的有源电力滤波器的基本结构及其工作原理,对二极管箝位多电平变换器主电路进行了数学建模,通过坐标变换推导出该变换器主电路在三相和dq坐标系下的等效电路。在此基础之上利用有功/无功解耦控制实现变换器在有源电力滤波应用中的有功/无功功率的平衡控制与直流电压的稳压控制,通过计算机仿真验证了系统模型的正确性及控制策略的有效性。(2)给出了一种在电压矢量空间实现谐波电流间接控制的算法,该算法通过预测谐波电流的大小将控制量变换为变换器输出电压参考,并独立于有源电力滤波器的有功与无功电流解耦控制,其输出与解耦控制输出的电压参考之和可直接应用于多电平空间电压矢量调制算法。(3) 提出了直流电压均压的调制方法和辅助均压电路两种均压方法。其中均压多电平SVPWM快速算法在α'β'坐标系下可简化数字化定点计算的运算强度,同时解决了无功补偿和有源电力滤波等应用中电容电压的不平衡问题。另外,研究了基于辅助电感的电容均压电路,通过控制该电路开关器件的不同导通与关断组合,在多个直流电容与均压电感间形成多组均压电流的流通回路。在前一个开关周期为电压最高的电容提供放电回路,在后一个开关周期为电压最低的电容提供充电回路,通过多次对电压最高的电容放电和电压最低的电容充电操作后,可实现所有直流电容电压的均衡。研制了小容量实验样机,主电路采用二极管箝位五电平主电路和直流均压电路,并设计了全数字控制系统,实现了无功／有功解耦控制和谐波电流的实时补偿,最后,完成了直流电压均衡、无功补偿和谐波抑制等功能的实验验证。
[Abstract]:Active power filter (APF) is an important device in flexible AC transmission system. its main circuit adopts power electronic converter structure, which can quickly respond to the change of load current and compensate harmonic current and reactive current in real time. It is a technical equipment to effectively suppress the current peak and its overvoltage and over-current caused by other equipment to solve the harmonic distortion and improve the power quality in the power supply system. At present, due to the voltage and current capacity of power electronic devices, the research and application of high voltage and large capacity active power filter is still less, and the research of multi-level active power filter is in its infancy. The capacity and voltage level of the converter based on diode clamped multi-level main circuit structure can be doubled compared with the traditional two-level structure, which greatly expands the application range of the topology in the field of high voltage and large capacity power conversion. It has become one of the research hotspots of power electronics technology and its application. Under this background, the structure, working principle and control of diode clamped multilevel converter in active filter system are studied in this paper. The main research work is as follows: (1) the basic structure and working principle of active power filter with multi-level main circuit structure are analyzed, and the main circuit of diode clamped multilevel converter is modeled. The equivalent circuit of the main circuit of the converter in three-phase and dq coordinate system is derived by coordinate transformation. On this basis, the active / reactive power balance control and DC voltage stabilization control of the converter in active power filter application are realized by using active / reactive power decoupling control. The correctness of the system model and the effectiveness of the control strategy are verified by computer simulation. (2) an algorithm for indirect control of harmonic current in voltage vector space is presented. The algorithm converts the control quantity into the output voltage reference of the converter by predicting the harmonic current, and is independent of the active and reactive current decoupling control of the active power filter. The sum of voltage reference of output and decoupling control output can be directly applied to multi-level space voltage vector modulation algorithm. (3) two voltage sharing methods, DC voltage sharing modulation method and auxiliary voltage sharing circuit, are proposed. The uniform voltage multi-level SVPWM algorithm can simplify the operation intensity of digital fixed-point calculation in 伪'尾 'coordinate system, and solve the imbalance problem of capacitance voltage in reactive power compensation and active power filter. In addition, the capacitor voltage equalizing circuit based on auxiliary inductance is studied. By controlling the different on and off combinations of the switching devices of the circuit, multiple groups of voltage sharing current circulation circuits are formed between multiple DC capacitors and voltage equalizing inductors. The discharge circuit is provided for the capacitor with the highest voltage in the previous switching period, and the charging circuit is provided for the capacitor with the lowest voltage in the latter switching period. After multiple charging operations on the capacitor with the highest voltage and the capacitance with the lowest voltage, The balance of all DC capacitance voltage can be realized. A small capacity experimental prototype is developed. The main circuit adopts diode clamped five-level main circuit and DC voltage sharing circuit, and an all-digital control system is designed to realize reactive / active decoupling control and real-time compensation of harmonic current. Finally, The functions of DC voltage balance, reactive power compensation and harmonic suppression are verified by experiments.
【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN713.8;TM761
本文编号：2481489
[Abstract]:Active power filter (APF) is an important device in flexible AC transmission system. its main circuit adopts power electronic converter structure, which can quickly respond to the change of load current and compensate harmonic current and reactive current in real time. It is a technical equipment to effectively suppress the current peak and its overvoltage and over-current caused by other equipment to solve the harmonic distortion and improve the power quality in the power supply system. At present, due to the voltage and current capacity of power electronic devices, the research and application of high voltage and large capacity active power filter is still less, and the research of multi-level active power filter is in its infancy. The capacity and voltage level of the converter based on diode clamped multi-level main circuit structure can be doubled compared with the traditional two-level structure, which greatly expands the application range of the topology in the field of high voltage and large capacity power conversion. It has become one of the research hotspots of power electronics technology and its application. Under this background, the structure, working principle and control of diode clamped multilevel converter in active filter system are studied in this paper. The main research work is as follows: (1) the basic structure and working principle of active power filter with multi-level main circuit structure are analyzed, and the main circuit of diode clamped multilevel converter is modeled. The equivalent circuit of the main circuit of the converter in three-phase and dq coordinate system is derived by coordinate transformation. On this basis, the active / reactive power balance control and DC voltage stabilization control of the converter in active power filter application are realized by using active / reactive power decoupling control. The correctness of the system model and the effectiveness of the control strategy are verified by computer simulation. (2) an algorithm for indirect control of harmonic current in voltage vector space is presented. The algorithm converts the control quantity into the output voltage reference of the converter by predicting the harmonic current, and is independent of the active and reactive current decoupling control of the active power filter. The sum of voltage reference of output and decoupling control output can be directly applied to multi-level space voltage vector modulation algorithm. (3) two voltage sharing methods, DC voltage sharing modulation method and auxiliary voltage sharing circuit, are proposed. The uniform voltage multi-level SVPWM algorithm can simplify the operation intensity of digital fixed-point calculation in 伪'尾 'coordinate system, and solve the imbalance problem of capacitance voltage in reactive power compensation and active power filter. In addition, the capacitor voltage equalizing circuit based on auxiliary inductance is studied. By controlling the different on and off combinations of the switching devices of the circuit, multiple groups of voltage sharing current circulation circuits are formed between multiple DC capacitors and voltage equalizing inductors. The discharge circuit is provided for the capacitor with the highest voltage in the previous switching period, and the charging circuit is provided for the capacitor with the lowest voltage in the latter switching period. After multiple charging operations on the capacitor with the highest voltage and the capacitance with the lowest voltage, The balance of all DC capacitance voltage can be realized. A small capacity experimental prototype is developed. The main circuit adopts diode clamped five-level main circuit and DC voltage sharing circuit, and an all-digital control system is designed to realize reactive / active decoupling control and real-time compensation of harmonic current. Finally, The functions of DC voltage balance, reactive power compensation and harmonic suppression are verified by experiments.
【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN713.8;TM761
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