【摘要】：隨著社會經(jīng)濟的不斷發(fā)展、電力需求的持續(xù)增長,微電網(wǎng)在新能源的利用方面可以充分發(fā)揮優(yōu)勢,其發(fā)展受到了越來越多的關注和重視。在微電網(wǎng)中,由于電力電子變換器和非線性負荷的存在,諧波問題對微電網(wǎng)的影響日益顯著,也會嚴重影響電網(wǎng)的電能質(zhì)量。本文以建立基于虛擬阻抗的微電網(wǎng)下垂控制策略和諧波抑制方法為目標,研究基于SOGI虛擬阻抗的微電網(wǎng)下垂控制策略。 首先,分析了微電源的功率傳輸特性,建立了微電源電壓電流環(huán)控制器、功率計算單元和下垂控制器模型。通過頻域法對微電源電壓電流環(huán)控制模型的傳遞函數(shù)進行分析,并采用極點配置法對電壓電流環(huán)控制器的參數(shù)進行了設計。 其次,在傳統(tǒng)的下垂控制策略的基礎上引入虛擬阻抗控制環(huán),建立了基于二階廣義積分(Second Order Generalized Integrator, SOGI)虛擬阻抗的下垂控制策略。采用頻域法對比分析了虛擬阻抗控制環(huán)對系統(tǒng)輸出特性的影響,并根據(jù)逆變器控制系統(tǒng)的閉環(huán)傳遞函數(shù),進行虛擬阻抗下垂控制模型的穩(wěn)定性分析。通過微電網(wǎng)運行仿真,對基于虛擬阻抗的下垂控制方法的有效性進行了驗證。 最后,分析了含虛擬阻抗的微電網(wǎng)諧波抑制方法,在MATLAB/Simulink中建立了微電網(wǎng)諧波抑制仿真算例,對微電網(wǎng)孤網(wǎng)和并網(wǎng)運行時的諧波抑制效果進行了研究,并分析了虛擬阻抗值對微電網(wǎng)諧波抑制效果的影響。 本論文建立的基于SOGI虛擬阻抗的下垂控制策略可以使系統(tǒng)穩(wěn)定運行,實現(xiàn)負載變化時功率自動分配�；谔摂M阻抗的微電網(wǎng)諧波抑制方法,可以有效地抑制微電網(wǎng)諧波,改善電能質(zhì)量,對諧波抑制具有一定的意義。
[Abstract]:With the continuous development of social economy and the continuous growth of power demand, microgrid can give full play to its advantages in the utilization of new energy, and its development has received more and more attention and attention. In microgrid, due to the existence of power electronic converter and nonlinear load, harmonic problem has more and more significant influence on microgrid, and it will also seriously affect the power quality of power grid. In this paper, the sag control strategy of microgrid based on virtual impedance and harmonic suppression method are established, and the drooping control strategy of microgrid based on SOGI virtual impedance is studied. Firstly, the power transmission characteristics of micro power supply are analyzed, and the voltage and current loop controller, power calculation unit and droop controller model of micro power supply are established. The transfer function of the voltage and current loop control model of the micro power supply is analyzed by the frequency domain method, and the parameters of the voltage and current loop controller are designed by using the pole assignment method. Secondly, on the basis of the traditional droop control strategy, the virtual impedance control loop is introduced, and the sag control strategy based on the second order generalized integral (Second Order Generalized Integrator, SOGI) virtual impedance is established. The influence of virtual impedance control loop on the output characteristics of the system is compared and analyzed by frequency domain method, and the stability analysis of virtual impedance drooping control model is carried out according to the closed-loop transfer function of inverter control system. The effectiveness of the droop control method based on virtual impedance is verified by microgrid operation simulation. Finally, the harmonic suppression method of microgrid with virtual impedance is analyzed, and a simulation example of microgrid harmonic suppression is established in MATLAB/Simulink, and the effect of harmonic suppression in isolated and grid-connected operation of microgrid is studied. The influence of virtual impedance value on harmonic suppression effect of microgrid is analyzed. In this paper, the sag control strategy based on SOGI virtual impedance can make the system run stably and realize the automatic power allocation when the load changes. The method of microgrid harmonic suppression based on virtual impedance can effectively suppress microgrid harmonics and improve power quality, which is of great significance to harmonic suppression.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM727

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