【摘要】：隨著傳統(tǒng)能源的日益枯竭以及環(huán)境污染的加劇,新能源發(fā)電成為解決當(dāng)前危機(jī)的重要途徑。分布式電源、儲(chǔ)能裝置以及負(fù)荷組成的微電網(wǎng)成為了研究的熱點(diǎn)問(wèn)題。微源特性對(duì)微電網(wǎng)的穩(wěn)定運(yùn)行以及電能質(zhì)量的影響值得重視并需研究相應(yīng)的改善措施。光伏發(fā)電單元、風(fēng)力發(fā)電單元等分布式發(fā)電裝置輸出功率的波動(dòng)是影響系統(tǒng)穩(wěn)定運(yùn)行的主要因素。微源通過(guò)大量電力電子裝置接入系統(tǒng)必然對(duì)微電網(wǎng)造成諧波污染。 本文詳細(xì)分析了風(fēng)光微源模型,研究了光伏發(fā)電單元以及風(fēng)力發(fā)電單元兩種典型微電源接入系統(tǒng)的方式,最后研究了微網(wǎng)孤島運(yùn)行的等效數(shù)學(xué)模型。 為了研究微電源不同特性對(duì)微網(wǎng)電壓穩(wěn)定性的影響,首先對(duì)微網(wǎng)孤島運(yùn)行時(shí)的靜態(tài)電壓穩(wěn)定性做了相關(guān)的分析�；趯�(duì)微網(wǎng)孤島運(yùn)行時(shí)電壓穩(wěn)定性的分析,研究了風(fēng)光微源對(duì)系統(tǒng)電壓穩(wěn)定性的影響。微電源輸出功率的不穩(wěn)定導(dǎo)致直流側(cè)電壓波動(dòng),進(jìn)而引起負(fù)荷端電壓的不穩(wěn)定。本文就微源引起的電壓不穩(wěn)做了相關(guān)的理論分析,并進(jìn)行了仿真驗(yàn)證。針對(duì)系統(tǒng)出現(xiàn)的電壓不穩(wěn)定現(xiàn)象,本文主要研究了儲(chǔ)能裝置以及相關(guān)控制策略對(duì)系統(tǒng)電壓穩(wěn)定的改善。 文章主要從微電源的接入以及拓?fù)浣Y(jié)構(gòu)入手,研究了微源特性對(duì)系統(tǒng)電能質(zhì)量的影響。詳細(xì)分析了微源接入產(chǎn)生的電壓波動(dòng)、電壓偏差以及諧波等電能質(zhì)量問(wèn)題。分析了光伏發(fā)電系統(tǒng)以及風(fēng)力發(fā)電系統(tǒng)的拓?fù)浣Y(jié)構(gòu)對(duì)系統(tǒng)電能質(zhì)量的影響。最后,從改善微網(wǎng)電能質(zhì)量環(huán)境出發(fā),研究了帶有APF功能的并網(wǎng)逆變器,建立了其小信號(hào)模型,分析了諧波電流的檢測(cè)方法以及電流控制方法。
[Abstract]:With the depletion of traditional energy and the worsening of environmental pollution, new energy generation has become an important way to solve the current crisis. Distributed power generation, energy storage devices and the micro-grid composed of loads have become a hot issue. The influence of microsource characteristics on the stable operation and power quality of microgrid is worthy of attention and the corresponding improvement measures should be studied. The fluctuation of output power of distributed generation units such as photovoltaic units and wind power units is the main factor that affects the stable operation of the system. Microsource access system through a large number of power electronic devices will inevitably cause harmonic pollution to the microgrid. In this paper, the solar microsource model is analyzed in detail, and the two typical micro-power access systems, photovoltaic unit and wind power unit, are studied. Finally, the equivalent mathematical model of micro-grid islanding operation is studied. In order to study the influence of different characteristics of micro-power supply on the voltage stability of microgrid, the static voltage stability of microgrid islanding operation is analyzed. Based on the analysis of the voltage stability of the microgrid isolated island system, the influence of the solar microsource on the voltage stability of the system is studied. The instability of the output power of the micro power supply leads to the fluctuation of the DC side voltage, which leads to the instability of the load terminal voltage. In this paper, the voltage instability caused by microsource is analyzed and simulated. In view of the voltage instability in the system, the improvement of the system voltage stability by the energy storage device and the related control strategy is studied in this paper. In this paper, the influence of microsource characteristics on the power quality of the system is studied from the access of micro power supply and the topology structure. The power quality problems such as voltage fluctuation, voltage deviation and harmonics generated by microsource access are analyzed in detail. The influence of the topology of photovoltaic system and wind power system on the power quality of the system is analyzed. Finally, in order to improve the power quality environment of microgrid, the grid-connected inverter with APF function is studied, its small signal model is established, and the detection method and current control method of harmonic current are analyzed.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM711

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