基于定频滞环空间矢量有源滤波器的研究

发布时间：2018-06-01 21:44

本文选题：谐波治理 + 有源滤波器　；参考：《太原理工大学》2017年硕士论文

【摘要】：本课题是教育部博士点基金项目“电网谐波抑制技术的研究”(20101402120004)的后续研究内容,是为了解决电网中存在的谐波污染问题。随着非线性负载和整流装置的大量使用,电网中谐波污染日益严重,降低了电能质量,严重时可能引发故障事故,有源滤波器的设计为谐波治理提供了更好的途径。与传统的LC滤波器相比,有源滤波器作为新型的谐波补偿装置,检测精度高、动态特性好,补偿效果明显,现已成为解决谐波污染的主要设备。本文对电压空间矢量控制的有源滤波器进行了改进,设计出定频滞环和空间矢量相结合的APF。整个系统从设计目的、理论研究、仿真验证和实验验证多方面论述,设计出了三相三线制结构、以单位功率因数法为谐波检测法和以定频滞环空间矢量为控制方法的并联型APF。具体研究内容如下:介绍了谐波产生原因和危害,从电能质量标准说明谐波治理的要求,对现阶段APF的研究热点和方向简要说明。学习研究了APF的电路结构和数学模型,对文中采用的谐波检测法和电流跟踪控制法进行了详细的推导解析。谐波检测采用单位功率因数法,并引入锁相环,保证指令电流检测的准确性。合理调试PI调节器,使直流侧电压快速达到指定数值并稳定运行。控制方法采用定频滞环空间矢量,不同于传统的SVPWM,这种方法省去了大量的数学运算,运用逻辑判断选择最优电压矢量,节约了时间,定频环节使得环宽满足频率需求变化。在MATLAB/Simulink中搭建仿真模型,根据电路要求,先进行APF容量、交流侧电感、直流侧电容和电压的参数计算,搭建各部分仿真模块,整合仿真电路。在不同负载和电源情况下,对系统仿真,得出结果。结果表明,基于定频滞环空间矢量的APF能满足要求。学习完善实验软硬件平台,编写硬件对应的软件程序。程序部分包括主程序和中断服务程序,其中重点设计了控制方法部分,对具体流程详细分析。同时,对其它设计不足部分进行了优化。在所搭建的实验平台进行实验,调试优化软硬件配置。分析所得实验数据,观察实验波形。结果表明,谐波电流畸变整体得到明显抑制,对于低次谐波抑制效果明显,验证了定频滞环空间矢量APF的可行性和有效性。
[Abstract]:This subject is the follow-up research content of the doctoral project of Ministry of Education "Research on harmonic suppression technology in power grid", which is to solve the problem of harmonic pollution in power grid. With the large use of nonlinear loads and rectifier devices, harmonic pollution in the power network becomes more and more serious, which reduces the power quality and may lead to fault when serious. The design of active power filter provides a better way for harmonic control. Compared with the traditional LC filter, active power filter (APF), as a new harmonic compensation device, has high detection precision, good dynamic characteristics and obvious compensation effect. It has become the main equipment to solve harmonic pollution. In this paper, the active filter of voltage space vector control is improved, and an APF with constant frequency hysteresis loop and space vector is designed. The whole system is discussed from the aspects of design purpose, theoretical research, simulation and experimental verification. A three-phase three-wire structure is designed, which uses the unit power factor method as the harmonic detection method and the constant frequency hysteresis space vector as the control method. The main contents of this paper are as follows: the cause and harm of harmonic generation are introduced, the requirements of harmonic control are explained from the power quality standard, and the research focus and direction of APF are briefly explained. The circuit structure and mathematical model of APF are studied, and the harmonic detection method and current tracking control method used in this paper are deduced and analyzed in detail. The harmonic detection adopts the unit power factor method and the phase-locked loop is introduced to ensure the accuracy of the instruction current detection. Adjust Pi adjuster reasonably, make DC side voltage reach the specified value quickly and run stably. The control method uses the fixed frequency hysteresis space vector, which is different from the traditional SVPWM. This method saves a lot of mathematical operation, uses logic judgment to select the optimal voltage vector, saves the time, and makes the loop width meet the frequency demand change. The simulation model is built in MATLAB/Simulink. According to the circuit requirements, the parameters of APF capacity, AC side inductance, DC side capacitance and voltage are calculated first, and each part of simulation module is built, and the simulation circuit is integrated. Under different load and power supply, the system is simulated and the result is obtained. The results show that the APF based on the constant frequency hysteresis space vector can meet the requirements. Learn to improve the experimental software and hardware platform, write the corresponding hardware software program. The program includes main program and interrupt service program. At the same time, the other parts of the design are optimized. Experiments are carried out on the platform, and the hardware and software configuration is optimized. The experimental data were analyzed and the experimental waveforms were observed. The results show that the harmonic current distortion is obviously suppressed, and the effect on the low order harmonic is obvious. The feasibility and effectiveness of the fixed frequency hysteresis space vector APF are verified.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761

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