单相动态电压恢复器的设计

发布时间：2018-05-21 03:43

本文选题：动态电压恢复器 + 电压跌落　；参考：《北京交通大学》2017年硕士论文

【摘要】：随着工业的飞速发展.越来越多非线性、冲击性负载被使用,由其引发电压跌落、瞬时断电等电能质量问题已成为电力用户共同关心的问题。动态电压恢复器(Dynamic Voltage Restorer,DVR)装置是一种能够保护敏感负荷免受供电端电压跌落、骤升等扰动的新型电力电子设备。串联变压器型动态电压恢复器结构简单,效果明显,广泛应用电能质量控制领域。因此,本文针对串联变压器型动态电压恢复器进行了研究。本文首先对动态电压恢复器的基本结构和原理进行了分析,并详细介绍了有无串联变压器对整个系统的影响。由于采用了串联变压器,实际中会产生漏感,文中讨论了漏感对滤波器设计和整个系统性能的影响。还确定了利用单相整流桥为逆变器提供输入直流电压,可以提供足够的能量和持续时间。快速、准确地检测出系统电压跌落的特征量是动态电压恢复器运行的前提条件。本文针对有效值检测法和基于瞬时无功功率理论的dq0检测法进行了介绍与仿真,并设计了数字低通滤波器,在保持检测精度的前提下提高了系统的响应速度。通过仿真说明改进有效值方法比传统的有效值法具有更好的实时性。在动态电压恢复器控制策略的研究方面,比较不同SPWM方式的优缺点,并推导采用单极性倍频方式的电压输出公式,说明了谐波的分布情况。然后基于PID经典控制算法对单电压闭环的几种方式和电压电流双闭环进行了仿真,结合仿真结果分析了不同控制策略在稳态性能和动态性能上的优缺点以及不同适用场合。最后通过向量图介绍了常用的三种补偿方式,说明不同补偿方式在经济成本方面的影响。最终本文设计了一台基于TMS320F28335数字化控制的单相串联变压器动态电压恢复器实验样机,进行了主电路方案设计、控制实验板的搭建及程序设计。实验结果表明,本文所设计的动态电压恢复器补偿效果良好,可以满足小功率场合电压跌落补偿的要求,为进一步研究奠定了的理论和实践基础。
[Abstract]:With the rapid development of industry, more and more nonlinear, the impact load is used, it causes the voltage drop, the instantaneous power quality problems have become the common concern of the power users. The dynamic voltage restorer (Dynamic Voltage Restorer, DVR) device is a kind of device to protect the sensitive load from the voltage drop of the power supply terminal. The series transformer type dynamic voltage restorer is simple, the effect is obvious, and the power quality control field is widely used. Therefore, the series transformer type dynamic voltage restorer is studied in this paper. Firstly, the basic structure and principle of the dynamic voltage restorer are analyzed, and the details of the dynamic voltage restorer are analyzed. The effect of a series transformer on the whole system is described in detail. Due to the use of a series transformer, the leakage inductance will be produced in practice. The effect of leakage inductance on the filter design and the performance of the whole system is discussed in this paper. The input DC voltage of the inverter is also determined by using a single-phase rectifier bridge to provide sufficient energy and duration. Fast and accurate detection of the characteristics of the voltage drop of the system is the precondition of the dynamic voltage restorer. In this paper, the effective value detection method and the dq0 detection method based on the instantaneous reactive power theory are introduced and simulated, and the digital low pass filter is designed to improve the response speed of the system on the premise of maintaining the detection precision. The simulation shows that the improved effective value method has better real-time performance than the traditional effective value method. In the study of the dynamic voltage restorer control strategy, the advantages and disadvantages of different SPWM modes are compared, and the voltage output formula using the unipolar frequency doubling mode is derived, and the distribution of harmonic waves is explained. Then based on the classical PID control calculation. Several modes of single voltage closed loop and double closed loop of voltage and current are simulated. The advantages and disadvantages of different control strategies in steady and dynamic performance are analyzed with simulation results. Finally, three kinds of common compensation methods are introduced by vector graph, and the economic cost of different compensation methods is explained. In this paper, a single phase series transformer dynamic voltage restorer experimental prototype based on TMS320F28335 digital control is designed, the main circuit scheme is designed, the construction of the experimental board and the program design are controlled. The experimental results show that the dynamic voltage restorer designed in this paper has good compensation effect and can satisfy the small power field. The requirement of voltage sag compensation has laid a theoretical and practical foundation for further research.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.2;TM761.12

【参考文献】