【摘要】：非線性負載和分布式電源的大規(guī)模使用帶來了一系列的電能質(zhì)量問題。在實際應(yīng)用中，即使并網(wǎng)逆變器不向電網(wǎng)注入諧波，電網(wǎng)中的大量非線性負載仍然會導(dǎo)致電網(wǎng)電壓畸變。為了解決該問題，本文嘗試將諧波補償功能附加在并網(wǎng)逆變器中，研究表明，在對并網(wǎng)逆變器合理控制和規(guī)劃的情況下，分布式電源就可以提高分布式電源的效率和電能質(zhì)量。 本文首先重點介紹了基于雙二階廣義積分的軟件鎖相環(huán)技術(shù)，該鎖相技術(shù)對諧波畸變不敏感，能夠在畸變的電壓背景下有效得提取出所需要的電網(wǎng)相角信息。其次對三相電壓源型逆變器的并網(wǎng)兩種控制策略，即電壓控制和電流控制進行對比分析。主要對現(xiàn)如今常用的并網(wǎng)控制策略PQ控制、V/f控制分別進行介紹。對逆變器并網(wǎng)運行的仿真結(jié)果表明，兩種方法都能順利實現(xiàn)該策略的控制目標(biāo)，效果良好。 通常來說，有源電力濾波廣泛應(yīng)用電流控制來抑制諧波干擾。然而，對于并網(wǎng)應(yīng)用，尤其是考慮到孤島運行時，經(jīng)常用到例如V-f控制等電壓控制的方法，因為這種方法可以直接提供電壓和頻率補償。如此看來，傳統(tǒng)的有源濾波中所用的電流控制諧波補償策略難以直接用于并網(wǎng)逆變器控制。為了克服這個缺陷，本課題研究了一種新穎的電壓控制方法，該方法可以跟電壓控制(如V-f控制、下垂控制等)分布式發(fā)電系統(tǒng)連接，這對微網(wǎng)中的電壓和頻率支持非常重要。 本文對傳統(tǒng)的基于電流控制的諧波抑制策略進行簡單的回顧。在此基礎(chǔ)上研究基于電壓控制的諧波抑制策略。與基于電流控制的諧波抑制策略相比，這種方法在保證相同補償效果的前提下，更加靈活可靠，并且實現(xiàn)了與并網(wǎng)逆變器基于電壓控制的控制策略的融合。為了進一步驗證本文使用的方案，搭建了以TMS320F2812DSP為核心控制單元的硬件平臺，編寫了系統(tǒng)軟件程序，最后在實驗平臺上對方案進行了實驗研究。結(jié)果表明，，本文可以通過控制并網(wǎng)逆變器來控制諧波，并且可以使并網(wǎng)逆變器靈活切換于諧波補償、不補償與諧波抑制三種模式，提高了并網(wǎng)逆變器的實用性
[Abstract]:Nonlinear load and large-scale use of distributed power have 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 add harmonic compensation function to grid-connected inverter. The research shows that the efficiency and power quality of distributed power supply can be improved under the condition of reasonable control and planning of grid-connected inverter. In this paper, the software phase-locked loop technique based on two-order generalized integral is introduced. The phase-locked loop is insensitive to harmonic distortion and can extract the phase angle information of power network effectively under the background of distorted voltage. Secondly, the voltage control strategy and current control strategy of three phase voltage source inverter are compared and analyzed. This paper mainly introduces the current grid-connected control strategy, PQ control and V / F control, respectively. The simulation results of grid-connected inverter show that the two methods can achieve the control goal of the strategy successfully and the effect is good. 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, a novel voltage control method is proposed, which can be connected with the voltage control (such as V-f control, droop control, etc.) distributed generation system, which is very important for the voltage and frequency support in the 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 studied. 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 scheme used in this paper, the hardware platform with TMS320F2812DSP as the core control unit is built, and the system software program is written. Finally, the experimental research on the scheme is carried out on the experimental platform. The results show that this paper can control harmonics by controlling grid-connected inverter, and can make grid-connected inverter switch to three modes of harmonic compensation, non-compensation and harmonic suppression, which improves the practicability of grid-connected inverter.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM464

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