發(fā)布時(shí)間：2018-07-11 16:12

  本文選題：光伏并網(wǎng)發(fā)電 + 有源濾波器�。� 參考：《長沙理工大學(xué)》2014年碩士論文

【摘要】：在全球能源形勢的大背景下,開發(fā)和利用新能源已經(jīng)成為解決能源危機(jī)的重要措施,其中太陽能以其無窮無盡的儲(chǔ)量及清潔安全無污染的特點(diǎn)成為新能源開發(fā)的重點(diǎn)對象之一。同時(shí),隨著越來越多的分布式能源以及非線性負(fù)荷接入電網(wǎng)使得電網(wǎng)中的諧波含量大大增加,對電力系統(tǒng)的穩(wěn)定造成了嚴(yán)重影響。本文對比分析了光伏并網(wǎng)逆變器和并聯(lián)型有源濾波器的結(jié)構(gòu)及其工作原理,研究其統(tǒng)一控制策略,使光伏并網(wǎng)發(fā)電系統(tǒng)同時(shí)具有光伏并網(wǎng)發(fā)電和有源濾波兩項(xiàng)功能,實(shí)現(xiàn)一機(jī)多能,不僅凈化了電網(wǎng)、提高了設(shè)備利用率,同時(shí)在一定意義上推動(dòng)了光伏產(chǎn)業(yè)的發(fā)展。針對多功能并網(wǎng)發(fā)電裝置的諧波電流檢測部分,本文分析了基于瞬時(shí)無功理論的單相諧波檢測方法,并對其進(jìn)行改進(jìn),同時(shí)提出了一種基于Fryze無功理論的諧波檢測方法,該方法在諧波檢測精度和響應(yīng)速度方面均優(yōu)于瞬時(shí)無功理論的檢測方法。與L濾波器相比,LCL濾波器具有更高的高頻衰減能力,但參數(shù)設(shè)計(jì)以及主電路控制也更復(fù)雜。首先,針對LCL濾波器的參數(shù)設(shè)計(jì),本文從LCL濾波器的數(shù)學(xué)模型入手,在基波和諧波輸出的限制條件下,通過圖解法詳細(xì)分析各參數(shù)之間的耦合關(guān)系,在一定諧振頻率和諧波衰減范圍內(nèi),得到LCL濾波器的參數(shù)設(shè)計(jì)和優(yōu)化方法。其次,關(guān)于LCL濾波器帶來的諧振問題,本文采用一種基于電容電流反饋的有源阻尼控制來進(jìn)行抑制。為了實(shí)現(xiàn)對指令電流良好的跟蹤效果,本文采用重復(fù)控制策略對指令電流進(jìn)行高精度的跟蹤,通過對多功能光伏并網(wǎng)發(fā)電裝置在單獨(dú)光伏發(fā)電、單獨(dú)有源濾波和同時(shí)光伏發(fā)電和有源濾波的方式下進(jìn)行仿真,結(jié)果驗(yàn)證了本文所設(shè)參數(shù)的正確性和控制策略的可行性。最后簡單的闡述了系統(tǒng)硬件電路的設(shè)計(jì)。
[Abstract]:Against the background of the global energy situation, the development and utilization of new energy has become an important measure to solve the energy crisis. Solar energy, with its endless reserves and clean, safe and pollution-free characteristics, has become one of the key targets of new energy development. At the same time, with more and more distributed energy and nonlinear load connected to the power network, the harmonic content in the power network is greatly increased, which has a serious impact on the stability of the power system. In this paper, the structure and working principle of photovoltaic grid-connected inverter and shunt active power filter are compared and analyzed, and its unified control strategy is studied, so that the photovoltaic grid-connected power generation system has two functions of photovoltaic grid-connected generation and active filter simultaneously. The realization of multifunction not only purifies the power grid, improves the utilization ratio of equipment, but also promotes the development of photovoltaic industry in a certain sense. Aiming at the harmonic current detection part of multi-function grid-connected generation device, this paper analyzes the single-phase harmonic detection method based on instantaneous reactive power theory, and improves it. At the same time, a harmonic detection method based on Fryze reactive power theory is proposed. This method is superior to the instantaneous reactive power theory in detecting accuracy and response speed. Compared with L filter, LCL filter has higher high frequency attenuation ability, but parameter design and main circuit control are more complex. First of all, aiming at the parameter design of LCL filter, this paper starts with the mathematical model of LCL filter, and analyzes the coupling relation among the parameters by graphic method under the limit of fundamental wave and harmonic output. In the range of resonance frequency and harmonic attenuation, the parameter design and optimization method of LCL filter are obtained. Secondly, an active damping control based on capacitive current feedback is used to suppress the resonance caused by LCL filter. In order to achieve good tracking effect of instruction current, this paper adopts repetitive control strategy to track instruction current with high precision. The simulation results of single active filter and simultaneous photovoltaic power generation and active filter show the correctness of the proposed parameters and the feasibility of the control strategy. At last, the design of the hardware circuit of the system is simply described.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM615

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 張鐵良;有源電力濾波器與光伏發(fā)電的統(tǒng)一控制研究[D];合肥工業(yè)大學(xué);2007年

，

本文編號(hào)：2115813