矿井提升机交流调速系统谐波抑制方法的研究

发布时间：2018-03-04 19:07

本文选题：矿井提升机　切入点：无源滤波　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：矿井提升机是煤矿企业中大型的生产型设备,其安全可靠地工作关系到人员的安全和企业的经济利益。随着交流调速技术的成熟,矿井提升机均采用交流调速系统。但是矿井提升机交流调速系统的应用给电网带来了附加的谐波污染问题。煤矿企业针对谐波污染问题采取了相应的措施,可是依然不能很好地抑制谐波向电网及其周边区域扩散。本文以矿井提升机交流调速为研究对象,以煤矿供电网络结构为基础展开了谐波抑制策略的研究。本文首先在谐波方面对比分析交直交变频调速和交交变频调速的优缺点,然后依据矿井提升机的工作特点,由仿真实验得到一个结论是：矿井提升机在运行过程中,变频和负载的变化都会引起电机端电压的畸变,从而影响电网电能质量。针对矿井提升机交流调速系统运行过程中产生谐波的原理,本文开始研究该系统的谐波抑制策略。谐波抑制方面主要采用有源滤波方式和无源滤波方式。而无源滤波又主要包括无源滤波器、静止无功补偿装置、静止无功发生器这三种。通过对比分析这三种无源滤波方式,可知静止无功发生器的性能是最优越的,但是成本高是其最大的缺点。在补偿原理上,静止无功发生器与有源滤波器很相似,而有源滤波器具有静止无功发生器的优点的同时成本相对来讲比较低。所以本文采用无源滤波器与有源滤波器相结合的方式来抑制矿井提升机交流调速系统的谐波。两者结合的情况下,有源滤波器可以弥补无源滤波器动态性能方面的不足,而无源滤波器可以弥补有源滤波器容量小的缺点。要使有源滤波器有好的动态补偿性能,就需要稳定有源滤波器直流侧电压,于是本文采用电压差平方参数离散化的PI自调节控制方式来控制直流侧电压的稳定。除此之外,无源滤波器容易受到电网阻抗变化的影响,有可能会导致电网的共振现象,文中采用有源阻尼来阻尼谐振现象。有源阻尼策略主要是通过改变输出的补偿电流,间接的改变滤波器所呈现出来的阻抗。有源滤波器抑制谐波危害和网络共振,主要依据模态分析和灵敏度矩阵评估策略计算参与因子两种方法。基于以上原理,在MATLAB/SIMULINK软件中搭建矿井提升机交流调速系统、有源滤波器、煤矿供电网络的仿真模型来验证所提出策略的有效性。最后设计了有源滤波器的软硬件部分。仿真和实验结果表明,混合型有源滤波器结合模态分析和灵敏度矩阵评估策略计算参与因子的方法,能够满足抑制矿井提升机交流调速系统谐波的要求。
[Abstract]:Mine hoist is a large production equipment in coal mine enterprise. Its safe and reliable work is related to the safety of personnel and the economic benefit of enterprise. With the development of AC speed regulation technology, The mine hoist adopts AC speed regulation system, but the application of AC speed regulation system of mine hoist brings additional harmonic pollution problem to the power network. Coal mine enterprises take corresponding measures to solve the problem of harmonic pollution. However, the harmonic diffusion to the power grid and its surrounding areas can not be restrained very well. This paper takes AC speed regulation of mine hoist as the research object, and carries out the research of harmonic suppression strategy based on the network structure of coal mine power supply. In this paper, the advantages and disadvantages of AC / DC variable frequency speed regulation and AC / AC frequency conversion speed regulation are compared and analyzed in the aspect of harmonics. Then, according to the working characteristics of mine hoist, a conclusion is drawn from the simulation experiment: the mine hoist is in operation. The variation of frequency conversion and load will cause the distortion of the motor terminal voltage, which will affect the power quality of the power grid. In view of the principle of harmonic generation during the operation of the AC speed regulating system of mine hoist, In this paper, the harmonic suppression strategy of the system is studied. Active filter and passive filter are mainly used in harmonic suppression, and passive filter mainly includes passive filter, static var compensation device. By comparing and analyzing the three passive filtering methods, we can see that the performance of the static Var Generator is the best, but its biggest disadvantage is the high cost. Static Var generators are very similar to active filters. The active power filter has the advantage of static Var generator and the cost is relatively low, so this paper uses the combination of passive filter and active filter to suppress the harmonics of AC speed regulation system of mine hoist. Wave. In the case of a combination of the two, Active filter can make up for the deficiency of passive filter in dynamic performance, and passive filter can make up for the shortcoming of small capacity of active filter. It is necessary to stabilize the DC side voltage of the active power filter, so the Pi self-regulation control method with discrete voltage difference square parameters is used to control the voltage stability of the DC side. In addition, the passive filter is easily affected by the variation of the impedance of the power network. In this paper, the active damping is used to damp the resonance phenomenon. The active damping strategy is mainly by changing the output compensation current. The active filter can suppress harmonic hazard and network resonance, and calculate the participation factor based on modal analysis and sensitivity matrix evaluation strategy. Based on the above principle, the AC speed regulation system and active filter of mine hoist are built in MATLAB/SIMULINK software. The simulation model of the coal mine power supply network is used to verify the effectiveness of the proposed strategy. Finally, the hardware and software part of the active power filter is designed. The simulation and experimental results show that, Combined with modal analysis and sensitivity matrix evaluation, the hybrid active power filter can be used to calculate the participation factor, which can meet the requirements of suppressing the harmonics of the AC speed regulating system of mine hoist.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD633

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