【作者】 赵前程；

【导师】 孙柏青；

【作者基本信息】 沈阳工业大学 ， 电力电子与电力传动， 2012， 硕士

【摘要】 随着能源危机和环境污染的日益严重,传统的内燃机汽车受到前所未有的挑战。作为新型的动力汽车,燃料电池汽车得到越来越多的关注。由于车辆的实际运行工况随机多变,以及大量电力电子器件的使用,由此引起的谐波对燃料电池系统稳定性造成很大的影响,因此对谐波抑制的研究成为燃料电池汽车极其重要的环节之一。本文针对燃料电池空气供给系统中,空压机驱动电机高频逆变系统的谐波问题展开研究,提出一种新型的基于变定时周期滞环电流控制有源电力滤波器(Active Power Filter, APF),对逆变系统输出侧的谐波进行实时补偿。理论分析和仿真结果表明,在高频条件下采用该方式的有源电力滤波器具有更好的谐波补偿性能,可以很好的满足系统的要求。本文首先在分析了燃料电池系统特殊性的基础上,对燃料电池高频逆变系统脉宽调制方式(Pulse Width Modulation, PWM)和脉冲幅值调制(Pulse Amplitude Modulation, PAM)输出谐波特性进行了仿真分析,仿真结果表明在采用了PAM电压调制方式下的逆变系统输出谐波含量更小。其次,基于系统对动态性能的要求,并且针对系统的高频工作环境,提出了一种基于变定时周期的滞环电流控制APF对谐波进行实时的补偿,根据谐波指令电流的幅值和频率变化改变定时周期,从而满足APF对逆变系统的谐波补偿性能的要求。通过理论分析和仿真结果表明,变定时周期的滞环电流控制与传统的定时滞环比较方式相比,可以更好的跟踪指令电流变化,减小跟踪误差,同时可以在一定的采样周期内保持开关频率的基本稳定,使得跟踪电流的输出频谱更加集中。最后在以上理论分析和仿真结果的基础上,结合燃料电池高频逆变系统和APF谐波补偿装置,对整个高频逆变系统的谐波特性进行仿真分析。仿真结果表明,在采用PAM调制方式以及基于变定时周期的滞环电流控制APF可以有效的抑制逆变系统的谐波成分,提高了系统的稳定性。更多还原

【Abstract】 With the emergence of energy crisis and enviromental pollution, the vehicle with internal-combustion engine is faced with a rigorous challenge. The fuel cell electric vehicle(FCEV) as a new electric vehicle is being taken into consideration. For the actual operating condition of the vehicle changes in a tochastic variable, the stability of the fuel cell system is seriously effected by harmonic current caused by the variable conditions. Therefore the harmonic suppression has been one of the key links in the study of FCEV.The thesis is proposed with consideration of the harmonic current. To realize the real-time compensation of the harmonic, a time-changed active power filter(APF) is set in the output side of the inverter. Theoretical analysis and simulation results show the good performance of harmonic compensation by the time-changed method, which able to meet requirements of the system.This thesis analyzed the harmonic characteristics of pulse width modulation (PWM) and pulse amplitude modulation (PAM) based on the specificity of the fuel cell system firstly, the simulation results show that PAM-controlled inverter has a better output harmonic performance. Secondly, the time-changed APF is proposed based on the dynamic performance requirements. The time can be changed by the variation of harmonic current detected. The theoretical analysis and simulation results show that the tracking error is decreased in the time-changed method compared with traditional time-control hysteresis current method. Besides, the time-changed controlled method maintain the switching frequency stability in a certain sampling period. Finally, the simulation results show the inverter system, which is combined the PAM-controlled inverter with the time-changed hysteresis current controller, eliminates the harmonic components of the inverter system effectively, and improves the stability of the system.更多还原