本文選題：微電網(wǎng) + 下垂控制��； 參考：《天津理工大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟和社會的快速進步,傳統(tǒng)大電網(wǎng)的規(guī)模在不停地擴大,其安全性和可靠性的缺陷也逐漸暴露出來。與此同時,環(huán)境污染和能源危機日益嚴重,能夠有效解決這些問題的微電網(wǎng)便應(yīng)運而生。微電網(wǎng)把分布式電源DG、控制裝置、儲能單元以及負荷組成一個單一可控的系統(tǒng),不但可以并網(wǎng)運行,而且能在大電網(wǎng)故障時孤網(wǎng)運行。在微電網(wǎng)運行與控制的過程中有很多重要的問題亟待解決,因此本文對微電網(wǎng)的控制及穩(wěn)定性進行研究。本文首先對微電網(wǎng)的研究目的及意義、基本概念及國內(nèi)外研究現(xiàn)狀、主要控制方式進行了綜述,然后分析了各種坐標(biāo)系下逆變器的數(shù)學(xué)模型,介紹了微網(wǎng)中各個分布式電源接口逆變器的三種控制方法。其次對逆變器的下垂控制的基本原理和功率傳輸特性進行了分析,論證了逆變器輸出阻抗和線路阻抗與逆變器控制方法的關(guān)系。應(yīng)用虛擬阻抗法對下垂控制進行改進,使得傳統(tǒng)的P/f、Q/V下垂控制方式能夠在低壓微電網(wǎng)中使用,完成了有功與無功的解耦控制。使用頻域法分析與對比了引入虛擬阻抗對于系統(tǒng)輸出特性的作用,并經(jīng)過對微電網(wǎng)的運行與仿真分析,驗證了基于虛擬阻抗的下垂控制方法的有效性。最后,對孤網(wǎng)運行微電網(wǎng)的各個組成部分建立了小信號狀態(tài)空間模型,并使用特征值法對其狀態(tài)矩陣進行分析,然后從理論上分析了最優(yōu)分散協(xié)調(diào)控制的工作原理,并給出了求解Levince-Athans方程組的具體方法,對微電網(wǎng)整體的狀態(tài)空間模型使用最優(yōu)分散協(xié)調(diào)控制,通過算例分析驗證了最優(yōu)分散協(xié)調(diào)控制對提高了系統(tǒng)的穩(wěn)定性的作用。
[Abstract]:With the rapid progress of economy and society, the scale of the traditional large power grid is constantly expanding, and the defects of its safety and reliability are gradually exposed. At the same time, environmental pollution and energy crisis are becoming more and more serious. The microgrid makes up a single controllable system of DG, control device, energy storage unit and load, which not only can be connected to the grid, but also can be operated in the isolated network in the event of large power network failure. There are many important problems to be solved in the process of microgrid operation and control. Therefore, the control and stability of microgrid are studied in this paper. In this paper, the purpose and significance of microgrid research, the basic concepts, the current research situation at home and abroad, the main control methods are summarized, and then the mathematical models of inverter in various coordinate systems are analyzed. This paper introduces three kinds of control methods of each distributed power interface inverter in microgrid. Secondly, the basic principle and power transmission characteristics of droop control of inverter are analyzed, and the relationship between inverter output impedance and line impedance and inverter control method is demonstrated. The virtual impedance method is used to improve the droop control, which makes the traditional P / F / Q / V droop control method can be used in low-voltage microgrid, and the decoupling control of active power and reactive power is realized. The effect of introducing virtual impedance on the output characteristics of the system is analyzed and compared by frequency domain method. The effectiveness of the droop control method based on virtual impedance is verified by the operation and simulation analysis of microgrid. Finally, the small signal state space model is established for each component of the isolated microgrid, and its state matrix is analyzed by eigenvalue method. Then, the working principle of optimal decentralized coordinated control is analyzed theoretically. The concrete method of solving Levince-Athans equations is given. The optimal decentralized coordinated control is used for the state space model of microgrid. The effect of the optimal decentralized coordinated control on the stability of the system is verified by an example.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM727

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