光伏发电系统协调控制研究
发布时间：2018-12-29 07:58
【摘要】：随着能源危机和环保呼声的高涨，太阳能光伏发电作为一种清洁、无污染的可再生资源受到越来越多人的关注。本文以独立光伏发电协调控制系统作为研究对象，提出一种新的控制方法——阻抗适配法。特点是通过对光伏电池等效内外阻抗的适配控制，使光伏电池根据需要获得连续的功率输出。与传统控制方法相比，阻抗适配法省去了协调控制系统中对工作模式的切换判断逻辑，用一种控制结构实现了最大功率跟踪和负载功率跟踪两种控制功能。 首先，对光伏发电协调控制系统的国内外研究现状进行分析，给出光伏电池的等效电路模型、输出特性仿真，并对储能环节中的储能元件超级电容进行介绍。 其次，对阻抗适配法的工作原理进行详细阐述，介绍其在光伏发电协调控制系统中的应用，分析阻抗适配系数K对系统稳定性影响。为了最大化利用太阳能，对阻抗适配系数K进行合理设计，通过不同的积分强度使阻抗关系满足匹配或适配，使光伏电池尽可能输出大的功率。 接着，对协同控制系统中不同的工作模式进行分析。根据控制要求，分别对单向变换器和双向变换器设计不同的控制策略。由于系统中存在两个变换器，为了减小彼此间的相互干扰，对系统稳定性进行分析，，设计出以双向变化器为主要控制的协调控制方案。 最后，搭建实验平台，给出主电路硬件设计、协调控制系统的控制流程。通过仿真和实验验证所提控制法切实有效、可行。
[Abstract]:With the energy crisis and the rising demand for environmental protection, solar photovoltaic power generation as a clean, pollution-free renewable resources has attracted more and more attention. In this paper, a new control method, Impedance adaptation method, is proposed, in which the coordinated control system of independent photovoltaic power generation is taken as the research object. It is characterized by the adaptive control of the equivalent internal and external impedance of the photovoltaic cell, which enables the photovoltaic cell to obtain continuous power output according to the need. Compared with the traditional control method, the impedance adaptation method eliminates the switching and judging logic of the working mode in the coordinated control system, and realizes two control functions, maximum power tracking and load power tracking, using a control structure. Firstly, the research status of photovoltaic coordinated control system at home and abroad is analyzed, the equivalent circuit model of photovoltaic cell and output characteristic simulation are given, and the super capacitor of energy storage element is introduced. Secondly, the working principle of impedance adaptation method is described in detail, its application in photovoltaic coordinated control system is introduced, and the influence of impedance adaptation coefficient K on system stability is analyzed. In order to maximize the use of solar energy, the impedance adaptation coefficient K is designed reasonably, and the impedance relation is matched or adapted by different integral intensity, which makes the photovoltaic cell output as large power as possible. Then, the different working modes in the cooperative control system are analyzed. According to the control requirements, different control strategies are designed for unidirectional converters and bidirectional converters. Because there are two converters in the system, in order to reduce the mutual interference between each other, the stability of the system is analyzed, and a coordinated control scheme with bidirectional variator as the main control is designed. Finally, the experiment platform is built, the hardware design of the main circuit is given, and the control flow of the control system is coordinated. Simulation and experiments show that the proposed control method is effective and feasible.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615
本文编号：2394547
[Abstract]:With the energy crisis and the rising demand for environmental protection, solar photovoltaic power generation as a clean, pollution-free renewable resources has attracted more and more attention. In this paper, a new control method, Impedance adaptation method, is proposed, in which the coordinated control system of independent photovoltaic power generation is taken as the research object. It is characterized by the adaptive control of the equivalent internal and external impedance of the photovoltaic cell, which enables the photovoltaic cell to obtain continuous power output according to the need. Compared with the traditional control method, the impedance adaptation method eliminates the switching and judging logic of the working mode in the coordinated control system, and realizes two control functions, maximum power tracking and load power tracking, using a control structure. Firstly, the research status of photovoltaic coordinated control system at home and abroad is analyzed, the equivalent circuit model of photovoltaic cell and output characteristic simulation are given, and the super capacitor of energy storage element is introduced. Secondly, the working principle of impedance adaptation method is described in detail, its application in photovoltaic coordinated control system is introduced, and the influence of impedance adaptation coefficient K on system stability is analyzed. In order to maximize the use of solar energy, the impedance adaptation coefficient K is designed reasonably, and the impedance relation is matched or adapted by different integral intensity, which makes the photovoltaic cell output as large power as possible. Then, the different working modes in the cooperative control system are analyzed. According to the control requirements, different control strategies are designed for unidirectional converters and bidirectional converters. Because there are two converters in the system, in order to reduce the mutual interference between each other, the stability of the system is analyzed, and a coordinated control scheme with bidirectional variator as the main control is designed. Finally, the experiment platform is built, the hardware design of the main circuit is given, and the control flow of the control system is coordinated. Simulation and experiments show that the proposed control method is effective and feasible.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615
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