【作者】 宋辉；

【导师】 同向前；

【作者基本信息】 西安理工大学 ， 电力电子与电力传动， 2018， 硕士

【摘要】 电力电子装置已经广泛应用到电力系统各个方面,使得电能可以改变应用方式以适应不同的用电场合,满足人们对不同电能形式的需求,但也给电网带来大量的谐波污染。有源电力滤波器是一种新型治理谐波污染的电力电子设备,它能够动态补偿电网谐波和无功,对治理谐波污染改善电能质量至关重要。文本以LCL型有源电力滤波器作为研究对象,对其输出滤波器设计、电流跟踪控制策略等问题进行深入研究。首先,详细分析了 LCL型有源电力滤波器的主电路拓扑及其基本工作原理,并分别在三相静止abc坐标系和两相静止αβ坐标系下建立了 LCL型有源电力滤波器数学模型;对有源电力滤波器系统的主电路参数进行了设计,确定了 APF直流侧电压、直流支撑电容参数和LCL滤波器参数;深入研究了 LCL滤波器各个参数对滤波器性能的影响以及各个参数之间的影响关系,并给出了适用于有源滤波器的LCL滤波器参数设计指标和方法。其次,分析了经典模型预测控制策略的原理和具体实现步骤,对经典模型预测控制方法进行了改进,进一步提高了 APF系统稳态补偿效果和动态响应速度;详细分析了系统存在固有延时的原因和带来的不良影响,针对系统存在的固有延时,将参考电流预测和模型预测两者结合起来对系统固有延时进行有效补偿,显著减小系统输出电流纹波,改善了系统稳定性和电流跟踪能力。最后,在PSIM中搭建了有源电力滤波器的系统仿真模型,对L型滤波器和LCL滤波器的滤波效果进行了仿真验证和性能比较,与L滤波器相比,LCL滤波器在抑制高频谐波方面具有显著优势。通过仿真,验证了改进的模型预测控制策略的优越性,并基于有源电力滤波器实验平台对所采用的改进模型预测控制策略开展了实验研究。实验结果表明,改进方法具有更好的谐波滤波效果和更快的动态响应速度。更多还原

【Abstract】 Power electronic equipments have been widely used in power system,which can transfer the electric energy to different type electric energy to meet the diversified needs of people.However,it will also bring a large amount of harmonic pollution to the grid.Active power filter(APF)is a new type of power electronic equipment which can administer harmonic pollution and suppress the harmonic and compensate the reactive power dynamically.It is of great importance to administer harmonic pollution and improve power quality.This paper takes LCL APF as the research object to do intensive researches for the design of output filter and current tracking control strategy.Firstly,analysis the main circuit topology of LCL-type APF and its basic working principle in detail.Establish the mathematical model of LCL-type APF in three phase stationary abc coordinate system and two phase stationary ap coordinate system.Design the parameters of main circuit of APF system,and the DC side voltage,DC supporting capacitance parameter and LCL-type filter parameter of APF.The influence of parameters on the performance of LCL-type filter and the relationship between the different parameters are studied.The parameter design index and method of LCL-type filter suitable for active filter are also given.Secondly,the principle and concrete realization steps of the classical model predictive control(MPC)strategy are analyzed.The control method of classical MPC is ameliorated to improve the steady-state compensation effect and dynamic response speed of APF system.The reason of inherent delay in the system and its adverse effects are analyzed in detail.For the inherent delay,the reference current with the model current prediction are combined to have an effective compensation for the inherent delay of system and reduce the output current ripple of the system and improve system stability and current tracking capability significantly.Eventually,the simulation model of APF is built in PSIM,and the filtering effects of L-type filter and LCL-type filter are simulated and compared.Compared with L filter,the LCL-type filter has significant advantages in suppressing high frequency harmonics.The superiority of the improved model predictive control(IMPC)strategy is verified,and the IMPC strategy is studied based on the experimental platform of APF.The experimental results show that the improved method has a better harmonic filtering effect and a faster dynamic response.更多还原