基于电压控制的三相逆变器并网谐波控制研究

发布时间：2018-04-18 08:22

本文选题：分布式电源 + 谐波补偿　；参考：《华南理工大学》2014年硕士论文

【摘要】：非线性负载和分布式电源的突破式地发展带来了一系列的电能质量问题。在实际应用中，即使并网逆变器不向电网注入谐波，电网中的大量非线性负载仍然会导致电网电压畸变。为了解决该问题，本文尝试控制并网逆变器进行谐波补偿，研究表明，在对并网逆变器合理控制和规划的情况下，分布式电源就可以提高分布式电源的效率和电能质量。电压源型逆变器的控制策略主要分为两大类：电压控制和电流控制。通常来说，有源电力滤波广泛应用电流控制来抑制谐波干扰。然而，对于并网应用，尤其是考虑到孤岛运行时，经常用到例如V-f控制等电压控制的方法，因为这种方法可以直接提供电压和频率补偿。如此看来，传统的有源滤波中所用的电流控制谐波补偿策略难以直接用于并网逆变器控制。为了克服这个缺陷，本课题研究了一种基于电压控制的谐波控制方法，即基于电压控制的三相逆变器并网谐波控制策略，该方法可以跟电压控制(如V-f控制、下垂控制等)分布式发电系统连接，这对微网中的电压和频率支持非常重要。本文对传统的基于电流控制的谐波抑制策略进行简单的回顾。在此基础上提出基于电压控制的谐波抑制策略。与基于电流控制的谐波抑制策略相比，，这种方法在保证相同补偿效果的前提下，更加灵活可靠，并且实现了与并网逆变器基于电压控制的控制策略的融合。为了进一步验证本文提出的方案，搭建了以TMS320F2812DSP为核心控制单元的硬件平台，编写了系统软件程序，最后在实验平台上对方案进行了实验研究。
[Abstract]:The breakthrough development of nonlinear load and distributed power has brought about a series of power quality problems.In practical applications, even if the grid-connected inverter does not inject harmonics into the grid, a large number of nonlinear loads in the power network will still lead to the voltage distortion of the grid.In order to solve this problem, this paper attempts to control the grid-connected inverter for harmonic compensation. The research shows that the efficiency and power quality of the distributed power supply can be improved by the reasonable control and planning of the grid-connected inverter.Voltage source inverter control strategy is divided into two main categories: voltage control and current control.In general, active power filter widely uses current control to suppress harmonic interference.However, voltage control methods such as V-f control are often used for grid-connected applications, especially considering the operation of isolated islands, because this method can directly provide voltage and frequency compensation.Therefore, the current control harmonic compensation strategy used in traditional active filter is difficult to be directly used in grid-connected inverter control.In order to overcome this shortcoming, this paper studies a harmonic control method based on voltage control, that is, the grid-connected harmonic control strategy of three-phase inverter based on voltage control, which can be matched with voltage control (such as V-f control).Sagging control, etc.) distributed generation system is connected, which is very important for voltage and frequency support in microgrid.In this paper, the traditional harmonic suppression strategy based on current control is reviewed briefly.On this basis, the harmonic suppression strategy based on voltage control is proposed.Compared with the harmonic suppression strategy based on current control, this method is more flexible and reliable on the premise of the same compensation effect, and realizes the fusion with the voltage control strategy of grid-connected inverter.In order to further verify the proposed scheme, the hardware platform with TMS320F2812DSP as the core control unit is built, and the system software program is written. Finally, the scheme is experimentally studied on the experimental platform.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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