基于PSCAD的直流微电网建模及控制策略研究
发布时间：2018-10-29 14:31
【摘要】：当今世界由于环境严重污染、能源日益紧缺等危机日益凸显,传统大电网的发展将面临着许多问题。在这种情况下,分布式电源以一种清洁可再生能源的形式成为未来电力系统发展的重要推动力。除了具备保护环境和可再生的优势之外,分布式能源还可以就地消耗电能、节省输变电费用,但分布式电源的随机波动性大、可控性差、单机接入成本高,这些缺陷制约了分布式电源的发展,限制了分布式电源对大电网的高渗透率,严重影响了分布式电源的效能发挥。微电网的引入,为解决分布式电源与大电网之间的矛盾提供了新的方法。微电网的形式主要分为交流微电网和直流微电网,直流微电网以其控制简单、损耗较小等优势成为了现今研究的焦点,因此本文以直流微电网作为研究对象。本文研究了多种分布式电源和储能装置的原理,综合分析了各自的性能特点和控制方法,依据数学模型在PSCAD电力系统仿真平台上分别建立了光伏发电系统模型、直驱永磁风机发电系统模型、铅酸蓄电池储能模型和交流大电网模型。通过直流母线将各电源模型与系统负荷连接在一起,构成直流微电网模型。为验证微电网系统模型的稳定性,对光伏发电系统模型、直驱永磁风机发电系统模型、铅酸蓄电池储能模型和交流大电网模型进行状态空间建模。根据微网系统模型的组成结构,将各状态空间方程联立成微分方程组,应用李雅普诺夫稳定性分析法分析了系统的稳定性。针对当前直流微电网控制中存在的一些缺陷,提出了一种基于预测的直流微电网控制策略,将控制策略应用于所建立的直流微电网模型中,设计了可以测试该控制策略有效性的情境。通过开启预测和关闭预测时母线电压波动的对比仿真实验,验证了该控制策略在并网运行转换为孤岛运行、有较大光照强度变化、有较大负荷接入或切除时,具有预测和平缓直流母线电压波动的功能。
[Abstract]:Nowadays, due to the serious environmental pollution and the increasing shortage of energy in the world, the development of the traditional power grid will face many problems. In this case, distributed power generation as a clean and renewable energy becomes an important driving force for the development of power systems in the future. In addition to the advantages of environmental protection and renewable, distributed energy can consume electricity locally and save the cost of transmission and transformation. However, the random volatility of distributed power supply is large, the controllability is poor, and the cost of single machine access is high. These defects restrict the development of distributed generation, limit the high permeability of distributed generation to large power grid, and seriously affect the efficiency of distributed generation. The introduction of microgrid provides a new method to solve the contradiction between distributed generation and large power grid. The microgrid is mainly divided into AC microgrid and DC microgrid. The DC microgrid has become the focus of research because of its advantages of simple control and low loss, so this paper takes DC microgrid as the research object. In this paper, the principles of various distributed power sources and energy storage devices are studied, and their performance characteristics and control methods are comprehensively analyzed. Based on the mathematical model, the photovoltaic power system models are established on the PSCAD power system simulation platform, respectively. Direct drive permanent magnet fan generation system model, lead acid battery energy storage model and AC large grid model. Each power supply model is connected with the system load by DC busbar to form a DC microgrid model. In order to verify the stability of the microgrid system model, the state space models of photovoltaic system model, direct-drive permanent magnet fan system model, lead-acid battery energy storage model and AC large grid model were established. According to the structure of the microgrid system model, the state space equations are combined into differential equations, and the stability of the system is analyzed by Lyapunov stability analysis method. Aiming at some defects in DC microgrid control, a predictive based DC microgrid control strategy is proposed. The control strategy is applied to the established DC microgrid model. A situation is designed to test the effectiveness of the control strategy. Through the comparative simulation experiments of bus voltage fluctuation during the open and off prediction, it is verified that the control strategy can be changed into island operation in grid-connected operation, and the light intensity is changed greatly, and when the load is connected or cut off, the control strategy can be obtained. It has the function of predicting and smoothing DC bus voltage fluctuation.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM727
[Abstract]:Nowadays, due to the serious environmental pollution and the increasing shortage of energy in the world, the development of the traditional power grid will face many problems. In this case, distributed power generation as a clean and renewable energy becomes an important driving force for the development of power systems in the future. In addition to the advantages of environmental protection and renewable, distributed energy can consume electricity locally and save the cost of transmission and transformation. However, the random volatility of distributed power supply is large, the controllability is poor, and the cost of single machine access is high. These defects restrict the development of distributed generation, limit the high permeability of distributed generation to large power grid, and seriously affect the efficiency of distributed generation. The introduction of microgrid provides a new method to solve the contradiction between distributed generation and large power grid. The microgrid is mainly divided into AC microgrid and DC microgrid. The DC microgrid has become the focus of research because of its advantages of simple control and low loss, so this paper takes DC microgrid as the research object. In this paper, the principles of various distributed power sources and energy storage devices are studied, and their performance characteristics and control methods are comprehensively analyzed. Based on the mathematical model, the photovoltaic power system models are established on the PSCAD power system simulation platform, respectively. Direct drive permanent magnet fan generation system model, lead acid battery energy storage model and AC large grid model. Each power supply model is connected with the system load by DC busbar to form a DC microgrid model. In order to verify the stability of the microgrid system model, the state space models of photovoltaic system model, direct-drive permanent magnet fan system model, lead-acid battery energy storage model and AC large grid model were established. According to the structure of the microgrid system model, the state space equations are combined into differential equations, and the stability of the system is analyzed by Lyapunov stability analysis method. Aiming at some defects in DC microgrid control, a predictive based DC microgrid control strategy is proposed. The control strategy is applied to the established DC microgrid model. A situation is designed to test the effectiveness of the control strategy. Through the comparative simulation experiments of bus voltage fluctuation during the open and off prediction, it is verified that the control strategy can be changed into island operation in grid-connected operation, and the light intensity is changed greatly, and when the load is connected or cut off, the control strategy can be obtained. It has the function of predicting and smoothing DC bus voltage fluctuation.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM727
【相似文献】
中国期刊全文数据库 前10条
1 郑漳华;艾芊;;微电网的研究现状及在我国的应用前景[J];电网技术;2008年16期
2 麻敏;韩继明;麻秀慧;陈衍妍;;浅谈微电网[J];科技资讯;2009年15期
3 楼书氢;李青锋;许化强;刘鲁丹;;国外微电网的研究概况及其在我国的应用前景[J];华中电力;2009年03期
4 杨为;丁明;毕锐;高研;丁银;;微电网实验平台的设计[J];合肥工业大学学报(自然科学版);2010年01期
5 袁清芳;周作春;陈艳霞;李香龙;陈国锋;;微电网发展应对策略[J];农村电气化;2010年10期
6 安智敏;罗时光;;微电网的概念及发展[J];内蒙古石油化工;2011年21期
7 王t，
本文编号：2297966
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2297966.html
