本文選題：微電網(wǎng) + 諧波分析�。� 參考：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文

【摘要】：諧波是電能質(zhì)量問(wèn)題的重要內(nèi)容之一。在微電網(wǎng)中,各種類(lèi)型的微電源、大量的變流裝置以及非線性負(fù)載都會(huì)造成諧波污染。為了提高供電質(zhì)量,本文從分析微電網(wǎng)內(nèi)諧波產(chǎn)生的機(jī)理入手,從以下三個(gè)方面對(duì)諧波治理方法進(jìn)行研究:(1)對(duì)APF的控制方法進(jìn)行研究。對(duì)于需要投入專(zhuān)門(mén)濾波裝置的場(chǎng)合,提出了關(guān)于APF無(wú)差拍預(yù)測(cè)直接功率控制(Direct Power Control,DPC)的控制方法。按照無(wú)差拍預(yù)測(cè)模型,在每個(gè)采樣周期實(shí)現(xiàn)對(duì)下一周期預(yù)測(cè)指令參考值的實(shí)時(shí)跟蹤。通過(guò)SVPWM方法產(chǎn)生APF控制信號(hào),保證了開(kāi)關(guān)頻率的固定。為了消除跟蹤誤差,對(duì)該控制方法進(jìn)行改進(jìn),加入了基于內(nèi)模原理的積分環(huán)節(jié)進(jìn)行反饋校正。在Matlab/Simulink軟件平臺(tái)搭建模型,對(duì)此方法進(jìn)行了仿真對(duì)比分析。結(jié)果表明,該控制方法能夠提高APF動(dòng)態(tài)跟蹤、抑制諧波的能力。(2)為了提高微電網(wǎng)運(yùn)行經(jīng)濟(jì)性,減少專(zhuān)門(mén)濾波設(shè)備的投入,利用儲(chǔ)能裝置和APF主電路結(jié)構(gòu)相同的特點(diǎn),提出了一種微電網(wǎng)在孤島狀態(tài)下儲(chǔ)能系統(tǒng)的綜合控制方法。通過(guò)疊加控制信號(hào)控制儲(chǔ)能裝置同時(shí)進(jìn)行系統(tǒng)調(diào)頻和諧波治理。利用Matlab/Simulink軟件對(duì)該綜合控制方法進(jìn)行了仿真分析。仿真結(jié)果表明,該綜合控制方法能夠達(dá)到預(yù)期效果。(3)在微電網(wǎng)多諧波源的背景下,為了降低對(duì)濾波裝置容量的要求,對(duì)諧波協(xié)同治理的可能性進(jìn)行初步探索。從電流角度分析協(xié)同治理的機(jī)理,得出對(duì)于工作在恒功率模式下的諧波源,諧波電流的相角隨其功率的變化而變化。通過(guò)Matlab/Simulink仿真和實(shí)驗(yàn)測(cè)試分別進(jìn)行觀察驗(yàn)證。結(jié)果表明,多個(gè)諧波源工作時(shí),一定范圍內(nèi)的功率變化,特定頻率的諧波電流之間存在相互消減的現(xiàn)象。本文提出上述三種諧波治理方法,經(jīng)濟(jì)性能不同,控制的復(fù)雜性也不相同。三者間形成互補(bǔ),可為微電網(wǎng)規(guī)劃建設(shè)階段的諧波治理方案提供參考。
[Abstract]:Harmonic is one of the important contents of power quality problem. In microgrid, various types of micro-power supply, a large number of converters and nonlinear loads will cause harmonic pollution. In order to improve the quality of power supply, this paper begins with the analysis of the mechanism of harmonic generation in microgrid, and studies the control method of APF from the following three aspects: 1). For the case where special filter device is needed, a direct Power control direct power control method for APF deadbeat prediction direct power control is proposed. According to the deadbeat prediction model, real-time tracking of the reference values of prediction instructions for the next cycle is realized in each sampling period. The APF control signal is generated by SVPWM method, and the switching frequency is fixed. In order to eliminate the tracking error, the control method is improved and feedback correction based on the internal model principle is added. The model is built on the Matlab/Simulink software platform, and the method is simulated and analyzed. The results show that the control method can improve the dynamic tracking of APF and the ability of harmonic suppression. In order to improve the operation economy of microgrid and reduce the input of special filter equipment, the energy storage device and the main circuit of APF have the same structure. A comprehensive control method for energy storage system of microgrid in isolated island state is presented. The energy storage device is controlled by superposition control signal and the frequency modulation and harmonic control of the system are carried out simultaneously. The integrated control method is simulated and analyzed by Matlab/Simulink software. The simulation results show that the integrated control method can achieve the desired effect. Under the background of multi-harmonic sources in microgrid, the possibility of harmonics co-control is preliminarily explored in order to reduce the requirement of filter capacity. The mechanism of cooperative treatment is analyzed from the angle of current. It is concluded that the phase angle of harmonic current varies with the change of power for harmonic source working in constant power mode. Matlab/Simulink simulation and experimental test were used to observe and verify. The results show that when multiple harmonic sources are working, the power varies in a certain range, and the harmonic currents at specific frequencies decrease each other. In this paper, the above three harmonic control methods are presented, the economic performance is different, and the control complexity is also different. They complement each other and can provide a reference for the harmonic control scheme in the planning and construction phase of microgrid.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM727;TM761

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