發(fā)布時(shí)間：2018-07-28 20:31

【摘要】：在當(dāng)今能源問(wèn)題日趨嚴(yán)重的情況下，采用可再生能源的分布式發(fā)電技術(shù)成為未來(lái)能源發(fā)展的主要方向，但是由于分布式發(fā)電技術(shù)具有電壓和頻率不穩(wěn)定的特點(diǎn)，易對(duì)大電網(wǎng)造成嚴(yán)重沖擊，因此電網(wǎng)采用限制分布式發(fā)電并網(wǎng)的管理方式。這就造成了分布式發(fā)電商業(yè)化程度較低的結(jié)果，大大限制了該項(xiàng)技術(shù)的發(fā)展，阻礙了其形成規(guī)�；\(yùn)行的進(jìn)程。微電網(wǎng)技術(shù)的提出，能夠大大改善分布式發(fā)電技術(shù)的現(xiàn)狀，穩(wěn)定其輸出電能的頻率和電壓，減小對(duì)大電網(wǎng)的沖擊；此外微電網(wǎng)也能在孤網(wǎng)運(yùn)行方式下運(yùn)行，在大電網(wǎng)故障時(shí)保證內(nèi)部基本負(fù)載的電能供應(yīng)，在充分利用可再生能源的同時(shí)增加供電可靠性。 微電網(wǎng)是由分布式電源和電力負(fù)荷構(gòu)成，可以在并網(wǎng)與孤島兩種工作模式下運(yùn)行，同時(shí)具有高度可靠性和穩(wěn)定性。隨著電力電子接口和現(xiàn)代控制理論的發(fā)展，微電網(wǎng)將額定功率幾十千瓦的發(fā)電單元作為微電源與負(fù)荷、儲(chǔ)能裝置及控制裝置等結(jié)合，成為單一可控的單元，同時(shí)向用戶供給電能。大規(guī)模分布式能源可以通過(guò)基于微電網(wǎng)結(jié)構(gòu)的電網(wǎng)并接入中低壓配電系統(tǒng)，是一種解決分布式能源并網(wǎng)的有效方案。 本文借助Matlab/Simulink仿真軟件，建立了各種元件的模型，仿真了微電網(wǎng)并網(wǎng)和孤網(wǎng)運(yùn)行兩種運(yùn)行方式，，在孤網(wǎng)運(yùn)行部分的仿真中，加入了電源電壓跌落工況的仿真。 仿真結(jié)果表明，在并網(wǎng)運(yùn)行方式下采用電流雙環(huán)控制，以及在孤網(wǎng)運(yùn)行方式下采用U/f控制方式的策略，能夠使微網(wǎng)運(yùn)行良好，保證負(fù)載供電。
[Abstract]:Under the increasingly serious energy problem, distributed generation technology with renewable energy has become the main direction of energy development in the future. However, because of the characteristics of voltage and frequency instability, distributed power generation technology has the characteristics of voltage and frequency instability. It is easy to make a serious impact on large power grid, so the management mode of limited distributed generation and grid connection is adopted. This results in a low degree of commercialization of distributed generation, which greatly limits the development of the technology and hinders the process of large-scale operation. The development of microgrid technology can greatly improve the present situation of distributed generation technology, stabilize the frequency and voltage of power output, and reduce the impact on large power grid. The power supply of internal basic load is guaranteed when the large power network fails, and the reliability of power supply is increased while making full use of renewable energy. Microgrid is composed of distributed power generation and power load. It can be operated under two operation modes, grid-connected and islanding, and has high reliability and stability at the same time. With the development of power electronic interface and modern control theory, microgrid combines the rated power generation unit with tens of kilowatts as a micro-power source, load, energy storage device and control device, and becomes a single controllable unit. At the same time to provide electricity to the user. Large-scale distributed energy can be connected to the medium-low voltage distribution system through the micro-grid structure, which is an effective solution to the grid connection of distributed energy. In this paper, with the help of Matlab/Simulink simulation software, the models of various components are established, and the two operation modes of microgrid and isolated grid are simulated. In the simulation of the operation part of the isolated network, the simulation of the power supply voltage drop condition is added. The simulation results show that the strategy of current double loop control in grid-connected operation mode and U / F control mode in isolated network operation mode can make the microgrid run well and ensure load supply.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM743

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