【作者】 王辉；

【导师】 李海锋；

【作者基本信息】 华南理工大学 ， 电力系统及其自动化， 2014， 硕士

【摘要】 当前电力系统承受来自传统化石能源短缺和环境污染的双重压力，促使各种新能源发电技术(例如风力发电、光伏发电等)的迅速发展。新能源发电的单机规模较小，适合以分布式电源(distributed generator，DG)的形式接入中、低压系统，就近向负荷提供灵活、经济、环保的电能。由于不同的DG的特性差异显著，传统电网在安全稳定、控制、优化调度等方面都受到前所未有的挑战，微电网为这些问题提供了有效的解决方案。本文主要围绕微电网的经济运行优化问题进行了研究。研究了微电网孤岛经济运行优化、并网经济运行优化以及计及运行方式切换的微电网经济运行优化问题。本文主要工作和研究成果如下：1.构建一种含储能的风、光、微型燃气轮机的微电网孤岛经济运行优化模型，以系统运行成本最小为目标，满足功率平衡约束的同时，考虑网络、安全等约束，例如爬坡约束、潮流约束、蓄电池的荷电状态和充放电电流约束、蓄电池的上一时刻与下一时刻荷电状态关系约束等。基于C++/GAMS编程进行算例仿真，验证了所提模型的合理性，为微电网的风、光、储及微型燃气轮机的联合孤岛经济运行提供参考。2.研究了微电网并网运行时的经济运行优化问题，以微电网并网运行时的系统总成本最低为目标，在充分考虑分布式电源自身的特性约束及网络安全约束的同时，讨论分析平均电价、峰谷电价和实时电价对微电网运行成本的影响，降低运行成本，充分利用微电网与主网互动的特性。结合实际的微电网模型，给出并网运行时的优化调度策略，通过C++/GAMS对所建模型进行优化求解，验证所建模型的合理性，为微电网并网运行提供参考。3.提出了一种微电网孤岛-并网统一优化模型，以并网模型作为主问题，孤岛问题为子问题，通过割集1和割集2来联系主问题与子问题，设计了一种T-t规则，用GAMS编程对所提建模型进行求解，验证所建模型的合理性。最后对全文工作进行了总结，概括了本文的主要研究成果，指出了今后进一步研究方向。本文研究工作得到了“以多环节综合互动为特征的智能电网综合示范工程”国家科技支撑计划(2013BAA01B02)以及国家自然科学基金(51307063)的资助。更多还原

【Abstract】 Nowadays, power system is sustaining the pressure from both traditional fossil energy shortageand environmental pollution, which promotes the rapid development of new energy technologies(such as wind power, solar power, etc). The capacity of new energy power generation is small andsuitable to link the low voltage system as the form of distributed generator (DG), which couldprovide flexible, economical and friendly power to load. Due to differences in the characteristics ofDG significantly, the contral, stability, reliability, power quality and other aspects of traditional powersystem are facing unprecedented challenges. Microgrid solves these issues effectively. This thesisfocuses on microgrid economic optimization, and is organized as follows.1. To achieve the optimal operation of microgrid, a island optimal model with energy storage isproposed, in which the constraints of equipment operation capacity, system physical operation andpower loss are considered, such as climbing constraints, power flow constraints, state of charge andcharge or discharge current constraints, etc. Based on C++/GAMS, a microgrid system is analyzed toexhibit the effectiveness of the proposed approach, which could provide a reference for microgrideconomic scheduling containing wind, solar, storage and turbines.2. It presents a connected-grid model to achieve the optimal operation of microgrid, in which theconstraints of equipment operation capacity and system physical operation are considered, at thesame time, the influence of the uniform rice, peak valley price and spot price to the cost of microgridare discussed, making full use of interactive features between gird and microgird to reduce microgridoperation cost. Combined with the actual microgrid model and analyzed to exhibit the effectivenessof the proposed approach in C++/GAMS.3. It presents a model for microgrid optimal scheduling considering grid-connected and islanded,the microgrid optimal scheduling problem is decomposed into a grid-connected operation masterproblem and islanded operation subproblem by cut1and cut2. A T-t islanding criterion is supposed.Based on GAMS, numerical simulations demonstrate the effectiveness of proposed microgrid optimalscheduling model.The last chapter summarizes the main findings of this paper, and points out the future researchdirections.This dissertation is supported by national science and technology supportplan comprehensive interactive characters for smart grid comprehensive demonstration project.更多还原