發(fā)布時(shí)間：2018-08-03 08:30

【摘要】：隨著分布式發(fā)電技術(shù)的大力發(fā)展和微網(wǎng)技術(shù)的日益成熟，越來越多的分布式電源通過微網(wǎng)技術(shù)接入低壓配電網(wǎng)形成智能微電網(wǎng)，，隨之會(huì)帶來如電壓波動(dòng)等電壓問題。考慮在大電網(wǎng)有功輸出比較充裕的情況下，系統(tǒng)對于分布式電源有功功率的輸出要求不是十分迫切。因此，可以通過對分布式電源有功和無功的合理調(diào)節(jié)來降低電壓波動(dòng)和減小電壓偏差。本文提出了一種基于分布式電源有功和無功綜合控制的智能微電網(wǎng)電壓控制方法，主要研究工作如下： 本文首先研究了一種基于圖論的分布式算法，并將其應(yīng)用于智能微電網(wǎng)。通過構(gòu)建一種簡單形式的分布式控制算法，并進(jìn)行仿真分析，驗(yàn)證了該算法能夠?qū)崿F(xiàn)對節(jié)點(diǎn)功率的分布式協(xié)調(diào)控制，并具有保持各節(jié)點(diǎn)功率總和不變的特性。 其次，基于低壓智能微電網(wǎng)中電壓波動(dòng)主要與有功功率有關(guān)這一結(jié)論，提出了一種基于有功功率的分布式電壓控制算法。當(dāng)系統(tǒng)發(fā)生電壓波動(dòng)時(shí)，通過對算法中參數(shù)化狀態(tài)轉(zhuǎn)移矩陣的修改和更新，協(xié)調(diào)控制分布式電源的有功出力，從而實(shí)現(xiàn)電壓控制，同時(shí)該算法可以滿足分布式電源的有功出力限制。通過對一個(gè)380V智能微電網(wǎng)進(jìn)行仿真，驗(yàn)證了該算法可以有效降低電壓波動(dòng)，提高電能質(zhì)量，對智能微電網(wǎng)的穩(wěn)定運(yùn)行起到積極作用。 最后，考慮分布式電源具有一定的無功調(diào)節(jié)能力，提出了有功和無功綜合作用的分布式電壓控制算法。通過對基于有功功率的分布式電壓控制算法進(jìn)行相應(yīng)地改進(jìn)，并對分布式電源的有功和無功出力進(jìn)行綜合協(xié)調(diào)控制，使之共同實(shí)現(xiàn)電壓控制。仿真結(jié)果表明，加入無功功率的調(diào)節(jié)后，有助于增大電壓調(diào)節(jié)范圍和進(jìn)一步提高電能質(zhì)量。
[Abstract]:With the development of distributed generation technology and the maturity of microgrid technology, more and more distributed power sources are connected to the low-voltage distribution network to form a smart microgrid, which will bring voltage problems such as voltage fluctuation. Considering that the active power output of large power grid is abundant, it is not very urgent for the system to output active power of distributed generation. Therefore, the voltage fluctuation and voltage deviation can be reduced by adjusting the active and reactive power reasonably. In this paper, a voltage control method for smart microgrid based on active and reactive power integrated control of distributed power generation is proposed. The main research work is as follows: firstly, a distributed algorithm based on graph theory is studied in this paper. And it is applied to smart microgrid. By constructing a simple distributed control algorithm and simulation analysis, it is verified that the algorithm can realize distributed coordinated control of node power, and has the property of keeping the sum of power of each node unchanged. Secondly, based on the conclusion that voltage fluctuation is mainly related to active power in low-voltage smart microgrid, a distributed voltage control algorithm based on active power is proposed. When the voltage fluctuation occurs in the system, by modifying and updating the parameterized state transfer matrix in the algorithm, the active power output of the distributed power supply is coordinated and the voltage control is realized. At the same time, the algorithm can satisfy the active power limit of distributed power generation. Through the simulation of a 380V smart microgrid, it is verified that the algorithm can effectively reduce the voltage fluctuation, improve the power quality, and play a positive role in the stable operation of the smart microgrid. Finally, considering the reactive power regulation ability of distributed power supply, a distributed voltage control algorithm is proposed, which combines active and reactive power. The distributed voltage control algorithm based on active power is improved accordingly, and the active and reactive power output of distributed power supply is controlled in a comprehensive and coordinated manner, so that the voltage control can be realized together. The simulation results show that the addition of reactive power regulation can increase the range of voltage regulation and further improve the power quality.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM761

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本文編號：2161183