【作者】 许明；

【导师】 廖敏夫；

【作者基本信息】 大连理工大学 ， 电机与电器， 2010， 硕士

【摘要】 近年来大量电力电子器件的广泛使用,向电网注入了大量谐波,谐波污染严重到逼迫我们正视的地步。在各种抑制谐波的措施中,有源电力滤波器因其优良的性能成为研究的热点。本文首先介绍了谐波的产生和危害,通过比较现存的各种谐波抑制方法,引出了有源电力滤波器的显著优点。随后对有源电力滤波器的系统结构、工作原理进行了介绍,并在此基础上建立了有源电力滤波器的数学模型。同时对谐波检测、控制系统等方面进行了深入研究和讨论准确而快速的谐波电流检测是有源电力滤波器进行谐波补偿的前提。本文应用基于park变换的d-q检测法,将基波电流转换为d-q坐标系下的直流量,通过滑窗迭代法设计的低通滤波器,很方便的实现了谐波电流检测。有源电力滤波器的控制系统是决定谐波补偿效果的决定性因素。本文通过建立有源电力滤波器的数学模型,对d轴和q轴上的电流进行解耦,运用PI控制策略,设计了一阶电流控制器。同时为了稳定直流侧电压,又加入了电压闭环控制系统。根据文中所述的理论和参数选择,建立了MATLAB下的SIMULINK仿真模型,验证了各个模块的功能,证明了文中所述理论的正确性。另外,又通过试验不同主电路参数下的谐波补偿效果,来寻找最优化的系统参数。总体来讲,仿真结果表明了有源电力滤波器对系统中的谐波具有较好的抑制效果。更多还原

【Abstract】 With the widespread use of a large number of power electronic devices in recent years, lots of harmonics is injected into the grid. The harmonic pollution is pushing us to face it. Among various harmonic suppression measures, active power filter has become a hot point of research because of its excellent performance.Firstly, this paper introduces the generation and harm of harmonic. Then the huge advantage of active power filter comes up by comparing different extant harmonic suppression measures.Then the system structure and principle is introduced. On this basis, the math model of APF is established. At the meantime, several fields are intensive studied, like harmonic current detection, control system, etc.Accurate and rapid detection of harmonic current is the precondition of harmonic compensation by APF.Applying the d-q detection method based on park transformation to the situation, fundamental current is transformed to the DC current in d-q coordinate. After the currents in d-q coordinate passing through the sliding-window low-pass filter, harmonic current is conveniently detected.The APF control system is the key factor deciding the effect of harmonic compensation. By establishing the math model of APF, decoupling currents on d-axe and q-axe, a first-order current controller using the PI control strategy, is designed in this paper. Meantime, in order to stabilize the DC side voltage, the closed loop of voltage control system is added in.According to theory and parameter selection related in this paper, the simulation model by SIMULINK module of MATLAB is founded. The simulation verifies the functions of different modules, which proved the theory in this paper right. In addition, harmonic compensation tests with different main curcuit parameters are carried on to find the optimized parameters.Overall, the simulation results point out that APF system performs good in harmonic suppression.更多还原