基于多输入直流变换器的楼宇直流微网控制研究
发布时间：2018-08-06 20:52
【摘要】：自工业化以来,世界经济与社会在快速发展的同时,伴随着的是对能源的不断消耗和环境的日益恶化。为缓解资源紧张和改善环境,清洁分布式新能源供电技术已成为联合供电系统的研究热点。在直流微网系统中,一些分布式能源因受到某些环境因素的制约而具有不确定性、随机性等特点,直接接入将会对系统造成冲击。采用直流微网供电网络,汇集各类分布式能源构成微网联合供电网络,实现对各能源特性的充分利用,能有效改善供电可靠性,使系统运行更加稳定持续。论文具体研究内容包括:1)直流微网系统中,作为能源汇集器的多输入直流变换器(Multiple-Input Converter,MIC)相比于单输入直流变换器,具有结构简洁和低成本等优势。本文在传统升降压直流变换器的基础上,提出一种新型三输入DC/DC变换器,该变换器具有可实现升降压、结构简单、可单独或同时向负载供电等特点,分析了其工作原理及稳态特性,提出了其控制策略。在MATLAB/Simulink仿真平台搭建了三输入变换器仿真模型,验证理论分析结果的正确性。2)为充分实现微网内分布式新能源的利用价值,需对微网内能源进行有效可靠的能源管理。能源管理整体思想为充分利用分布式清洁能源,微网内功率波动由储能单元与配网协调控制。本文将双输入直流变换器作为微网内发电系统的能源汇集器,蓄电池及配网并至直流母线。提出了母线电压分级控制方法,针对直流母线电压的变化量,将母线电压分成6个不同的等级,微网内微源依据实时母线电压所在控制等级,变换不同的运行模式,协调控制各个微源功率输出,维持微网内功率平衡及电压稳定。双输入变换器内光伏发电单元采用扰动观察法MPPT控制,实时输出最大功率,风力发电单元采用母线恒压控制,对蓄电池采用恒流恒压/电压下垂控制。最后在MATLAB仿真平台搭建了基于MIC的楼宇直流微网仿真模型,通过仿真结果验证能源管理策略的合理性。
[Abstract]:Since industrialization, the world economy and society have developed rapidly, accompanied by the constant consumption of energy and the worsening of the environment. In order to alleviate the shortage of resources and improve the environment, clean and distributed new energy supply technology has become the research hotspot of the joint power supply system. In DC microgrid systems, some distributed energy sources are uncertain and random due to some environmental factors. Direct access will impact the system. The DC microgrid power supply network is used to combine all kinds of distributed energy sources to form a combined micro-grid power supply network, which can make full use of the energy characteristics, effectively improve the reliability of power supply, and make the system run more steadily and continuously. The main contents of this paper are as follows: (1) Multiple-Input converters, as energy converters, have the advantages of simple structure and low cost compared with single-input DC / DC converters. In this paper, a novel three-input DC/DC converter is proposed based on the traditional up-down DC / DC converter. The converter has the advantages of realizing voltage lifting, simple structure, and can supply power to load alone or simultaneously. Its working principle and steady state characteristic are analyzed, and its control strategy is put forward. The simulation model of three-input converter is built on the MATLAB/Simulink simulation platform, which verifies the correctness of the theoretical analysis result .2) in order to fully realize the utilization value of distributed new energy in microgrid, it is necessary to effectively and reliably manage the energy source in microgrid. The overall idea of energy management is to make full use of distributed clean energy, and the power fluctuation in the microgrid is controlled by the energy storage unit and the distribution network. In this paper, the dual-input DC / DC converter is used as the energy collector, battery and distribution network of the micro-grid generation system to the DC bus. A bus voltage hierarchical control method is proposed. According to the variation of DC bus voltage, the bus voltage is divided into six different grades. The microsource in the microgrid transforms different operation modes according to the control level of the real-time bus voltage. Coordinate and control the power output of each microsource to maintain the power balance and voltage stability in the microgrid. In the dual-input converter, the photovoltaic unit is controlled by MPPT method of disturbance observation, and the maximum power is output in real time. The wind power unit is controlled by bus constant voltage, and the battery is controlled by constant current and constant voltage / voltage sag. Finally, a building DC microgrid simulation model based on MIC is built on the MATLAB simulation platform, and the simulation results verify the rationality of the energy management strategy.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM46
[Abstract]:Since industrialization, the world economy and society have developed rapidly, accompanied by the constant consumption of energy and the worsening of the environment. In order to alleviate the shortage of resources and improve the environment, clean and distributed new energy supply technology has become the research hotspot of the joint power supply system. In DC microgrid systems, some distributed energy sources are uncertain and random due to some environmental factors. Direct access will impact the system. The DC microgrid power supply network is used to combine all kinds of distributed energy sources to form a combined micro-grid power supply network, which can make full use of the energy characteristics, effectively improve the reliability of power supply, and make the system run more steadily and continuously. The main contents of this paper are as follows: (1) Multiple-Input converters, as energy converters, have the advantages of simple structure and low cost compared with single-input DC / DC converters. In this paper, a novel three-input DC/DC converter is proposed based on the traditional up-down DC / DC converter. The converter has the advantages of realizing voltage lifting, simple structure, and can supply power to load alone or simultaneously. Its working principle and steady state characteristic are analyzed, and its control strategy is put forward. The simulation model of three-input converter is built on the MATLAB/Simulink simulation platform, which verifies the correctness of the theoretical analysis result .2) in order to fully realize the utilization value of distributed new energy in microgrid, it is necessary to effectively and reliably manage the energy source in microgrid. The overall idea of energy management is to make full use of distributed clean energy, and the power fluctuation in the microgrid is controlled by the energy storage unit and the distribution network. In this paper, the dual-input DC / DC converter is used as the energy collector, battery and distribution network of the micro-grid generation system to the DC bus. A bus voltage hierarchical control method is proposed. According to the variation of DC bus voltage, the bus voltage is divided into six different grades. The microsource in the microgrid transforms different operation modes according to the control level of the real-time bus voltage. Coordinate and control the power output of each microsource to maintain the power balance and voltage stability in the microgrid. In the dual-input converter, the photovoltaic unit is controlled by MPPT method of disturbance observation, and the maximum power is output in real time. The wind power unit is controlled by bus constant voltage, and the battery is controlled by constant current and constant voltage / voltage sag. Finally, a building DC microgrid simulation model based on MIC is built on the MATLAB simulation platform, and the simulation results verify the rationality of the energy management strategy.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM46
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