【摘要】：微電網(wǎng)以利用多樣化、清潔等優(yōu)點,逐漸成為一種重要的供電方式。提高其在實際應用中的穩(wěn)定性,特別是要解決高次諧波現(xiàn)象對電能質(zhì)量造成的影響勢在必行�，F(xiàn)階段大部分的負荷都是非線性的,另外電網(wǎng)中含有大量電力電子器件,都是產(chǎn)生諧波的原因。故而,我們要改善用戶用電質(zhì)量抑制電力諧波是十分必要的。本文先通過分析微電網(wǎng)的結(jié)構(gòu),探討了如何改善用戶用電質(zhì)量的措施,重點分析諧波產(chǎn)生的來源。為了抑制微電網(wǎng)中的電力諧波,提出了一種LCL型微網(wǎng)逆變器與三相四線制并聯(lián)型APF相結(jié)合的新型方案。首先搭建了 LCL型微網(wǎng)逆變器濾波的模型。隨后建立了電容中點型三相四線制有源濾波器的數(shù)學模型,分析了諧波檢測的一系列方法,確定利用基于靜止ABC坐標系下的滯環(huán)控制方法及ip-iq諧波檢測法。最后,利用Simulink仿真平臺建立相應的實驗模型,實驗結(jié)果證明了這種方案可以大大的降低電網(wǎng)中電流的畸變率。同時,本文還驗證了動靜態(tài)響應,當負載變化的時候,該方案依然有很好的抑制效果。
[Abstract]:Microgrid has gradually become an important power supply mode with the advantages of diversification and cleanliness. It is imperative to improve its stability in practical application, especially to solve the influence of high order harmonic phenomenon on power quality. At this stage, most of the loads are nonlinear, in addition, there are a large number of power electronic devices in the power grid, which is the cause of harmonic generation. Therefore, it is necessary for us to improve the quality of power consumption and suppress power harmonics. By analyzing the structure of microgrid, this paper discusses how to improve the quality of consumer power consumption, and analyzes the source of harmonic generation. In order to suppress power harmonics in microgrid, a new scheme of combining LCL microgrid inverter with three-phase four-wire parallel APF is proposed. Firstly, the filter model of LCL microgrid inverter is built. Then the mathematical model of three-phase four-wire active filter with capacitor midpoint type is established and a series of harmonic detection methods are analyzed. The hysteresis control method based on static ABC coordinate system and the ip-iq harmonic detection method are determined. Finally, the corresponding experimental model is established by using the Simulink simulation platform. The experimental results show that this scheme can greatly reduce the distortion rate of the current in the power network. At the same time, the dynamic and static response is verified. When the load changes, the scheme still has a good suppression effect.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM727;TM761

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