交直流混合微電網(wǎng)運行優(yōu)化及仿真分析
發(fā)布時間：2018-07-30 06:27
【摘要】：微電網(wǎng)是為了發(fā)揮分布式發(fā)電的優(yōu)勢，降低分布式發(fā)電對大電網(wǎng)的消極影響而發(fā)展出的一種新的分布式能源組成結(jié)構(gòu)，交直流混合微電網(wǎng)更是同時展現(xiàn)出交流微電網(wǎng)和直流微電網(wǎng)共同的優(yōu)勢，是目前最優(yōu)的微電網(wǎng)組網(wǎng)形式。交直流混合微電網(wǎng)具有諸多好處，例如可以充分利用資源，推進分布式電源的發(fā)展，使得其對環(huán)境效用影響減輕，促進了社會的可持續(xù)發(fā)展。顯而易見，微電網(wǎng)的發(fā)展是電網(wǎng)今后的必然趨勢，是大電網(wǎng)的強有力補給和支撐。 本文研究了交直流混合微電網(wǎng)運行優(yōu)化及仿真分析。首先，設(shè)計了交直流混合微電網(wǎng)的結(jié)構(gòu)。該混合微電網(wǎng)主要是由規(guī)模比較小的風(fēng)力發(fā)電、太陽能光伏發(fā)電電池等分布式電源、儲存能量的裝置和用戶端負荷組成。在了解了風(fēng)力發(fā)電技術(shù)、光伏發(fā)電技術(shù)、儲能技術(shù)、微電網(wǎng)等相關(guān)理論知識的基礎(chǔ)上，對交直流混合微電網(wǎng)的特性進行分析。同時將該微電網(wǎng)與大電網(wǎng)并網(wǎng)運行，提升了供電可靠性。 其次，創(chuàng)建了交直流混合微電網(wǎng)的數(shù)學(xué)模型。在清楚了電力系統(tǒng)優(yōu)化運行理論的基礎(chǔ)上，明確了交直流混合微電網(wǎng)運行優(yōu)化的必要性，并建立了能夠獲得最佳收益效果的混合微電網(wǎng)模型，該模型從以風(fēng)力發(fā)電為主的角度出發(fā)，，利用光伏電池板獨立逆變器方便擴展和切除的特性，可以使得風(fēng)能這種可再生能源得到最大限度的開發(fā)利用，同時又可以減少風(fēng)能由于自身受環(huán)境影響較大而造成的輸電不穩(wěn)定性對大電網(wǎng)的影響。認(rèn)真分析了于本微電網(wǎng)所有運行有關(guān)的約束條件，主要有光伏電池的發(fā)電特點、對儲能容量的約束、風(fēng)力發(fā)電的運行特點、負荷的變化規(guī)律以及微電網(wǎng)功率平衡條件等。 最后，進行了混合微電網(wǎng)的數(shù)值仿真分析，該分析是在指定條件下進行的。在上文中已經(jīng)建立好的優(yōu)化到最佳方案的微電網(wǎng)運行的數(shù)學(xué)模型的基礎(chǔ)上，用某一個有具體算例的典型例子，采取了混沌優(yōu)化思想的最新改進粒子群的優(yōu)化算法開展了仿真計算。驗證了交直流混合微電網(wǎng)在接入大電網(wǎng)時能更安全可靠運行，且能獲得更高的收益。對于微電網(wǎng)在電池充電和放電不同分時情境下的運行情況進行了仿真分析，以研究蓄電池對混網(wǎng)運行的影響。 綜上，交直流混合微電網(wǎng)可以緩解分布式發(fā)電對大電網(wǎng)的影響，靈活便利巧妙的向用戶輸送安全性好、可靠性佳、低成本的電能，可再生能源利用率達到最佳。
[Abstract]:Microgrid is a new distributed energy structure developed in order to exert the advantages of distributed generation and reduce the negative impact of distributed generation on large power grid. AC-DC hybrid microgrid also shows the common advantages of AC microgrid and DC microgrid, which is the best form of microgrid network at present. AC-DC hybrid microgrid has many advantages, such as making full use of resources, promoting the development of distributed power generation, reducing its impact on environmental utility and promoting the sustainable development of society. It is obvious that the development of microgrid is the inevitable trend of power grid in the future, and it is a powerful supply and support for large power grid. In this paper, the operation optimization and simulation analysis of AC / DC hybrid microgrid are studied. Firstly, the structure of AC / DC hybrid microgrid is designed. The hybrid microgrid is mainly composed of small wind power generation, solar photovoltaic cells and other distributed power sources, energy storage devices and user load. Based on the knowledge of wind power generation technology, photovoltaic generation technology, energy storage technology, micro-grid and other related theoretical knowledge, the characteristics of AC / DC hybrid microgrid are analyzed. At the same time, the microgrid is connected with the large power grid to improve the reliability of power supply. Secondly, the mathematical model of AC / DC hybrid microgrid is established. On the basis of the theory of power system optimization, the necessity of AC / DC hybrid microgrid operation optimization is clarified, and the hybrid microgrid model which can obtain the best benefit effect is established. From the point of view of wind power generation, the model makes use of the characteristics of photovoltaic panel independent inverter to expand and remove conveniently, which can make wind energy as a renewable energy to be developed and utilized to the maximum extent. At the same time, it can reduce the impact of transmission instability caused by wind energy due to its environmental impact on the large power grid. The constraints related to the operation of the micro-grid are carefully analyzed, including the characteristics of photovoltaic cell generation, the constraints on the storage capacity, the operating characteristics of wind power generation, the law of load variation and the power balance conditions of the micro-grid, etc. Finally, the numerical simulation analysis of hybrid microgrid is carried out under specified conditions. On the basis of the mathematical model that has been established above to optimize the operation of the microgrid to the best scheme, a typical example with a concrete example is used. The new improved particle swarm optimization (PSO) algorithm based on chaos optimization is used to carry out the simulation. It is proved that AC / DC hybrid microgrid can be operated more safely and reliably when it is connected to large power grid, and can obtain higher income. In order to study the effect of battery on the operation of hybrid grid, the operation of microgrid under different time sharing conditions of battery charge and discharge is simulated and analyzed. To sum up, AC / DC hybrid microgrid can alleviate the influence of distributed generation on large power grid, and provide users with good security, good reliability, low cost and optimal utilization of renewable energy.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM732
本文編號：2154106
[Abstract]:Microgrid is a new distributed energy structure developed in order to exert the advantages of distributed generation and reduce the negative impact of distributed generation on large power grid. AC-DC hybrid microgrid also shows the common advantages of AC microgrid and DC microgrid, which is the best form of microgrid network at present. AC-DC hybrid microgrid has many advantages, such as making full use of resources, promoting the development of distributed power generation, reducing its impact on environmental utility and promoting the sustainable development of society. It is obvious that the development of microgrid is the inevitable trend of power grid in the future, and it is a powerful supply and support for large power grid. In this paper, the operation optimization and simulation analysis of AC / DC hybrid microgrid are studied. Firstly, the structure of AC / DC hybrid microgrid is designed. The hybrid microgrid is mainly composed of small wind power generation, solar photovoltaic cells and other distributed power sources, energy storage devices and user load. Based on the knowledge of wind power generation technology, photovoltaic generation technology, energy storage technology, micro-grid and other related theoretical knowledge, the characteristics of AC / DC hybrid microgrid are analyzed. At the same time, the microgrid is connected with the large power grid to improve the reliability of power supply. Secondly, the mathematical model of AC / DC hybrid microgrid is established. On the basis of the theory of power system optimization, the necessity of AC / DC hybrid microgrid operation optimization is clarified, and the hybrid microgrid model which can obtain the best benefit effect is established. From the point of view of wind power generation, the model makes use of the characteristics of photovoltaic panel independent inverter to expand and remove conveniently, which can make wind energy as a renewable energy to be developed and utilized to the maximum extent. At the same time, it can reduce the impact of transmission instability caused by wind energy due to its environmental impact on the large power grid. The constraints related to the operation of the micro-grid are carefully analyzed, including the characteristics of photovoltaic cell generation, the constraints on the storage capacity, the operating characteristics of wind power generation, the law of load variation and the power balance conditions of the micro-grid, etc. Finally, the numerical simulation analysis of hybrid microgrid is carried out under specified conditions. On the basis of the mathematical model that has been established above to optimize the operation of the microgrid to the best scheme, a typical example with a concrete example is used. The new improved particle swarm optimization (PSO) algorithm based on chaos optimization is used to carry out the simulation. It is proved that AC / DC hybrid microgrid can be operated more safely and reliably when it is connected to large power grid, and can obtain higher income. In order to study the effect of battery on the operation of hybrid grid, the operation of microgrid under different time sharing conditions of battery charge and discharge is simulated and analyzed. To sum up, AC / DC hybrid microgrid can alleviate the influence of distributed generation on large power grid, and provide users with good security, good reliability, low cost and optimal utilization of renewable energy.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM732
【參考文獻】
相關(guān)期刊論文 前1條
1 許洪陽;;通過冰災(zāi)和震災(zāi)看發(fā)展分布式電源和微電網(wǎng)的重要性——訪電網(wǎng)規(guī)劃專家田華[J];中國科技財富;2008年08期
本文編號：2154106
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