智能化低频低压减载模型及其敏感性分析研究

发布时间：2018-05-30 03:09

本文选题：低频减载 + 低压减载　；参考：《天津大学》2014年硕士论文

【摘要】：低频低压减载是保证电力系统安全稳定运行的最后一道防线,是维系电力系统功率平衡、防止电力系统频率和电压崩溃的有效控制方法。广域量测体系的建设、需求侧响应技术的发展和智能电网背景下智能家电的推广应用为传统的减载方法提供了新的发展方向。本文主要研究了基于智能家电的低频低压减载模型及其敏感性分析。首先分析低频低压减载的基本原理及其传统整定方法,对电力系统频率特性与电压失稳机理进行了深入的研究。然后研究智能电网背景下智能家电性能特征,以电冰箱和热水器为例,分析其运行方式和动作特性,建立适用于大电网分析的智能家电的实用模型,并在需求侧响应技术的基础上提出适用于智能减载的控制方法。接下来提出一种基于智能家电的智能化低频低压减载策略并在测试系统中进行仿真验证,仿真结果表明此减载策略能在电力系统受到扰动后快速有效的抑制频率和电压的跌落甚至崩溃,减少切负荷量,减少经济损失并提高电力系统的灵活可靠性。最后,对切负荷点和切负荷量两个变量进行敏感性分析,研究切负荷点和切负荷量对系统频率和节点电压的影响,为优化智能化低频低压减载方案提出指导性建议。
[Abstract]:Low-frequency low-voltage load reduction is the last line of defense to ensure the safe and stable operation of power system. It is an effective control method to maintain power balance and prevent power system frequency and voltage collapse. The construction of wide-area measurement system, the development of demand-side response technology and the popularization and application of smart home appliances in the context of smart grid provide a new development direction for the traditional load reduction methods. In this paper, the low-frequency low-voltage load reduction model based on intelligent home appliances and its sensitivity analysis are studied. Firstly, the basic principle of low-frequency low-voltage load reduction and its traditional tuning method are analyzed, and the frequency characteristics and voltage instability mechanism of power system are deeply studied. Then, the performance characteristics of smart home appliances under the background of smart grid are studied. Taking refrigerator and water heater as examples, the operation mode and action characteristics are analyzed, and the practical model of smart home appliances suitable for the analysis of large power grid is established. Based on the demand-side response technology, a control method suitable for intelligent load reduction is proposed. Then, an intelligent low-frequency and low-voltage load reduction strategy based on intelligent household appliances is proposed and simulated in the test system. The simulation results show that the proposed load reduction strategy can quickly and effectively suppress the drop or even collapse of frequency and voltage, reduce the amount of load shedding, reduce the economic loss and improve the flexibility and reliability of power system after the power system is disturbed. Finally, sensitivity analysis of load shedding point and load shedding quantity is carried out, and the influence of shedding point and load shedding quantity on system frequency and node voltage is studied, and some guiding suggestions for optimizing intelligent low-frequency low-voltage load reduction scheme are put forward.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM732;TM712

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