交直流混合微电网运行优化及仿真分析
发布时间：2018-07-30 06:27
【摘要】：微电网是为了发挥分布式发电的优势，降低分布式发电对大电网的消极影响而发展出的一种新的分布式能源组成结构，交直流混合微电网更是同时展现出交流微电网和直流微电网共同的优势，是目前最优的微电网组网形式。交直流混合微电网具有诸多好处，例如可以充分利用资源，推进分布式电源的发展，使得其对环境效用影响减轻，促进了社会的可持续发展。显而易见，微电网的发展是电网今后的必然趋势，是大电网的强有力补给和支撑。 本文研究了交直流混合微电网运行优化及仿真分析。首先，设计了交直流混合微电网的结构。该混合微电网主要是由规模比较小的风力发电、太阳能光伏发电电池等分布式电源、储存能量的装置和用户端负荷组成。在了解了风力发电技术、光伏发电技术、储能技术、微电网等相关理论知识的基础上，对交直流混合微电网的特性进行分析。同时将该微电网与大电网并网运行，提升了供电可靠性。 其次，创建了交直流混合微电网的数学模型。在清楚了电力系统优化运行理论的基础上，明确了交直流混合微电网运行优化的必要性，并建立了能够获得最佳收益效果的混合微电网模型，该模型从以风力发电为主的角度出发，，利用光伏电池板独立逆变器方便扩展和切除的特性，可以使得风能这种可再生能源得到最大限度的开发利用，同时又可以减少风能由于自身受环境影响较大而造成的输电不稳定性对大电网的影响。认真分析了于本微电网所有运行有关的约束条件，主要有光伏电池的发电特点、对储能容量的约束、风力发电的运行特点、负荷的变化规律以及微电网功率平衡条件等。 最后，进行了混合微电网的数值仿真分析，该分析是在指定条件下进行的。在上文中已经建立好的优化到最佳方案的微电网运行的数学模型的基础上，用某一个有具体算例的典型例子，采取了混沌优化思想的最新改进粒子群的优化算法开展了仿真计算。验证了交直流混合微电网在接入大电网时能更安全可靠运行，且能获得更高的收益。对于微电网在电池充电和放电不同分时情境下的运行情况进行了仿真分析，以研究蓄电池对混网运行的影响。 综上，交直流混合微电网可以缓解分布式发电对大电网的影响，灵活便利巧妙的向用户输送安全性好、可靠性佳、低成本的电能，可再生能源利用率达到最佳。
[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.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM732
本文编号：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.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM732
【参考文献】
相关期刊论文 前1条
1 许洪阳;;通过冰灾和震灾看发展分布式电源和微电网的重要性——访电网规划专家田华[J];中国科技财富;2008年08期
本文编号：2154106
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