本文選題：微網(wǎng) + 諧波抑制��； 參考：《浙江工業(yè)大學(xué)》2015年碩士論文

【摘要】：微網(wǎng)由于能夠協(xié)調(diào)大電網(wǎng)與分布式發(fā)電系統(tǒng)之間的矛盾,日漸受到人們的關(guān)注。然而,微網(wǎng)中非線性負(fù)荷的接入、微電源的并網(wǎng)、大量電力電子設(shè)備的應(yīng)用以及高電壓等級(jí)電網(wǎng)諧波的滲透會(huì)造成微網(wǎng)系統(tǒng)輸出的電壓或電流發(fā)生畸變,導(dǎo)致微網(wǎng)中存在大量的諧波分量。這些諧波的存在將會(huì)給微網(wǎng)帶來很多危害,甚至危及微網(wǎng)的安全穩(wěn)定性。因而,如何抑制諧波,保證微網(wǎng)的電能質(zhì)量是目前微網(wǎng)研究的重點(diǎn)問題之一。為解決微網(wǎng)諧波問題,提出基于虛擬阻抗的微網(wǎng)諧波抑制方法,并利用免疫粒子群算法優(yōu)化微網(wǎng)濾波器參數(shù),達(dá)到抑制微網(wǎng)諧波的目的,降低電壓諧波率。主要研究內(nèi)容如下:1.針對(duì)基于傳統(tǒng)下垂控制的光伏微網(wǎng)系統(tǒng),對(duì)光伏微源、逆變器接口、功率控制、下垂控制以及電壓電流雙環(huán)控制進(jìn)行建模,并對(duì)系統(tǒng)中產(chǎn)生的諧波問題進(jìn)行分析。2.針對(duì)光伏微網(wǎng)系統(tǒng)中的諧波問題,提出基于免疫粒子群算法的微網(wǎng)濾波器參數(shù)優(yōu)化方法。首先,建立對(duì)應(yīng)的目標(biāo)函數(shù)和適應(yīng)度函數(shù),并給出LC濾波器參數(shù)的約束條件。其次,在粒子群算法中加入免疫算法,利用免疫算法的自我調(diào)節(jié)功能,避免粒子群算法的早熟收斂問題,進(jìn)而提高算法的全局搜索能力。同時(shí),利用Matlab實(shí)現(xiàn)免疫粒子群算法的編程,并采用該算法調(diào)用微網(wǎng)仿真系統(tǒng),得到濾波器最優(yōu)參數(shù)。最后,與經(jīng)驗(yàn)值法得到的仿真結(jié)果進(jìn)行對(duì)比,驗(yàn)證所提方法在抑制微網(wǎng)諧波方面的有效性與優(yōu)越性。3.在濾波器參數(shù)優(yōu)化的基礎(chǔ)上,進(jìn)一步提出基于虛擬阻抗的微網(wǎng)諧波抑制方法。首先,在傳統(tǒng)控制中的基波功率下垂控制基礎(chǔ)上,通過功率控制器計(jì)算出諧波無功功率,利用諧波無功功率與諧波指令電壓之間的下垂控制關(guān)系,設(shè)計(jì)出諧波無功功率下垂控制模塊。其次,根據(jù)虛擬阻抗的基本原理,設(shè)計(jì)出虛擬諧波阻抗模塊,實(shí)現(xiàn)對(duì)相關(guān)諧波電流和虛擬諧波阻抗的求解,得到虛擬諧波電壓。將虛擬諧波阻抗模塊與諧波無功功率下垂控制模塊相結(jié)合,得到諧波補(bǔ)償電壓。最后,利用Simulink工具在微網(wǎng)孤島與并網(wǎng)狀態(tài)下實(shí)現(xiàn)所提方法。案例分析表明,該方法能夠有效地抑制微網(wǎng)諧波,降低電壓畸變率,提高電能質(zhì)量。
[Abstract]:The micro network is attracting more and more attention because it can coordinate the contradiction between the large power grid and the distributed generation system. However, the access of the nonlinear load, the grid of the micro power supply, the application of a large number of power electronic devices and the penetration of the harmonic in the high voltage grade power grid will cause the distortion of the voltage or current of the output of the microgrid system. There are a lot of harmonic components in the micronetwork. The existence of these harmonics will bring a lot of harm to the micronet, even endangers the safety and stability of the micronet. Therefore, how to restrain the harmonic and ensure the power quality of the micronet is one of the key problems in the research of micronet. In order to solve the problem of micro network harmonic, the harmonic suppression of micronet based on the virtual impedance is put forward. And using the immune particle swarm optimization (PSO) algorithm to optimize the parameters of the microgrid filter to suppress the micronet harmonics and reduce the voltage harmonics. The main contents are as follows: 1. for the photovoltaic microgrid system based on the traditional droop control, the photovoltaic micro source, inverter interface, power control, droop control and voltage and current double loop control are built. The harmonic problem in the system is analyzed and the harmonic problem in the photovoltaic micronetwork system is analyzed by.2.. The method of optimizing the parameters of the microgrid filter based on the immune particle swarm optimization is proposed. First, the corresponding objective function and fitness function are established, and the constraints of the LC filter parameters are given. Secondly, the particle swarm optimization is added to the particle swarm optimization algorithm. The immune algorithm, using the self-regulation function of the immune algorithm, avoids the premature convergence problem of particle swarm optimization, and then improves the global searching ability of the algorithm. At the same time, the programming of the immune particle swarm optimization algorithm is realized by Matlab, and the algorithm is used to call the micronet simulation system, and the optimal parameters of the filter are obtained. Finally, the imitation of the empirical value method is obtained. Real results are compared to verify the effectiveness and superiority of the proposed method in restraining the harmonics of micronet..3. based on the optimization of the filter parameters, the method of harmonic suppression based on the virtual impedance is further proposed. First, the harmonic reactive power is calculated by the power controller on the basis of the base wave power drooping control in the traditional control. Rate, using the droop control relationship between harmonic reactive power and harmonic instruction voltage, the harmonic reactive power droop control module is designed. Secondly, based on the basic principle of virtual impedance, a virtual harmonic impedance module is designed to achieve the solution of the related harmonic current and virtual harmonic impedance, and the virtual harmonic voltage is obtained. The anti module and the harmonic reactive power droop control module are combined to obtain the harmonic compensation voltage. Finally, the Simulink tool is used to implement the proposed method under the state of micronetwork isolated island and grid connected. The case analysis shows that this method can effectively suppress the micronet harmonics, reduce the voltage distortion and improve the power quality.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM727

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