【作者】 王皓；

【导师】 王立德；

【作者基本信息】 北京交通大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 随着电气化铁道的快速发展,电铁牵引负荷不断增长,电铁牵引供电系统由于其自身特点对电力系统造成了一定的污染,严重影响了电力系统的供电质量。因此,对电铁牵引负荷进行谐波和无功补偿的研究具有非常重要的意义。本文首先介绍了有源电力滤波器(Active Power Filter,简称APF)的基本原理及发展历程,阐述了单相混合型滤波系统的方案和结构原理,对其进行了谐波和无功补偿原理的定量分析,通过理论推导证明了该系统具有谐波和无功补偿的功能。分析比较了几种谐波和无功电流检测方法,重点研究了有功电流分离的检测方法和瞬时无功功率理论,提出了基于瞬时无功功率理论的单相系统的无功电流检测方法,提高了无功电流检测的速度和精度。分析比较了有源电力滤波器的控制策略,重点研究了状态优化的定边带宽度控制方法、基于单极性PWM控制的方法和基于三角波调制PWM控制的方法,根据工程实际要求,提出了一种改进的三角波调制PWM控制方法,使大功率无功补偿装置在固定频率的条件下工作,提高了电流跟踪的精度。通过分析系统参数设计的总体要求,提出了有源电力滤波器主电路参数的设计方法,得到了单相混合型滤波系统参数。本文在PSCAD/EMTDC环境下建立了包含单相混合型滤波系统的牵引供电系统仿真模型,仿真考查该系统的补偿效果。仿真结果证实了该系统整体结构、电流检测、控制策略及参数计算方法的正确性和可行性。更多还原

【Abstract】 With the rapid development of electrified railway, the electric railway traction load has been constantly growing. Due to its own characteristics, the electric railway traction power supply system causes a certain amount of pollution on the power system, which has seriously affected the quality of power supply. Therefore, the research on harmonic and reactive compensation for electric railway traction load is of great significance.The basic principles and evolution process of Active Power Filter (APF) are first introduced. The scheme and structure of single-phase hybrid filter system is then illustrated and quantitative analysis is made based on the harmonic and reactive compensation principles. Through theoretical derivation, the said system has been proved to have the function of harmonic and reactive compensation.By analyzing and comparing a couple of harmonic and reactive current detecting methods and focusing on the active power current separation detecting method and instantaneous reactive power theory, a reactive current detecting method of single-phase system based on the instantaneous reactive power theory is proposed, which will improves the speed and accuracy of reactive current detecting.The control strategy of active power filter is analyzed. The optimized set sideband control method and other two methods based on unipolar PWM control and the triangular wave PWM are mainly studied. According to the practical requirements of the project, an improved triangular wave PWM control method is proposed which allows the high power reactive compensating devices work under the condition of fixed frequency and improves the accuracy of current tracking.By analyzing the general requirements for design of system parameter, a main circuits parameter designing method of active power system is proposed, and the parameter of single-phase hybrid filter system is obtained.A traction power supply system simulation model including single-phase hybrid filter system is established in the PSCAD/EMTDC environment to verify the compensation effect of the system. The simulation results confirmed the correctness and feasibility of the overall structure of the system, the method of current detection, control strategies and parameters calculation.更多还原