新能源储能关键技术的研究
发布时间：2018-11-07 07:11
【摘要】：传统能源枯竭及带来的环境污染问题是目前经济发展亟待解决的两大问题。为实现经济的可持续发展,开发和探究可再生新型能源成为世界范围的趋势。综合多方面考虑,太阳能的应用前景最为广阔,因此受到很多国家的重视。在光伏发电应用发展的同时,储能系统也受到了越来越多的关注,通过对能量储存、释放与转换的控制,可以实现能源利用的高可靠性、高效率、高利用率,从而达到节约能源、改善环境的目的。因此,新能源储能系统的研究已经成为当今世界研究的热点。针对新能源储能系统的现实要求,本文提出了一个包括：光伏组件阵列、最大功率点跟踪(Maximum Power Point Tracking, MPPT)控制器、储能动力电池组、电池管理系统(Battery Management System, BMS)、并网逆变器、双向DC/DC电路以及相应的储能电站联合控制调度系统等在内的发电系统,并重点设计和研究了其中的储能子系统和光伏发电子系统及其关键技术。研究储能子系统中的双向DC/DC变换器,为提高其效率,采用软开关技术以及三相交错并联的电路结构,一方面有助于减小电感电流纹波,从而提高功率密度,另一方面有助于开关器件的选取,从而提高变换器效率；研究了常见的几种储能电池,通过比较它们之间的优缺点,给出了储能电池的选型；研究了BMS的主要功能,不仅可以提高电池的使用寿命与利用率,而且整个系统功率也能够得到更好的利用。研究光伏发电子系统中的双向AC/DC变换器,给出了调制方法与具体的工作原理及模态分析。针对功率变换系统(Power Convert System, PCS)能量双向流动的应用,分别对双向AC/DC变换器,双向DC/DC变换器以及储能电池进行了建模与仿真,从而设计出PCS能量双向流动控制器。针对储能系统在新形势下并网／离网功能,给出了PCS并网／离网运行控制原理和具体的模式切换过程,创造性的提出了一种并网／离网运行平滑切换时电压型控制与电流型控制的前馈控制方法。该方法无需等到电网电压过零时再切换,可以减轻调节器的负担,加快控制系统的动态响应速度,从而可实现并网和离网运行的平滑切换。论文为所研究的PCS设计了主电路参数,给出了电感、电容详细的设计过程和方法,并选择了开关器件。详细分析了PCS的损耗,给出了理论分析后的结果,验证了参数设计的正确性。对BMS的硬件电路进行了设计,给出了硬件电路框图；在对软件进行设计时,介绍了主要参数采集的软件流程。采用TI公司的数字芯片TMS320F28035作为控制核心,美信专用芯片MAX 14921构建电池测量电路,从而实现了储能系统的全数字控制。本文采用PSIM软件对PCS及控制策略进行了仿真和分析,并设计了储能系统的实验样机。通过仿真及实验测试验证了参数设计的合理性以及控制策略的可行性。
[Abstract]:The depletion of traditional energy and the environmental pollution are two problems to be solved urgently in economic development. In order to realize the sustainable development of economy, it has become a worldwide trend to develop and explore new renewable energy sources. Considering many aspects, solar energy has the most broad application prospect, so it is paid more attention by many countries. With the development of photovoltaic power generation application, energy storage system has been paid more and more attention. Through the control of energy storage, release and conversion, high reliability, high efficiency and high efficiency of energy utilization can be realized. In order to save energy and improve the environment. Therefore, the research of new energy storage system has become a hot spot in the world. In order to meet the practical requirements of new energy storage system, this paper proposes a photovoltaic module array, maximum power point tracking (Maximum Power Point Tracking, MPPT) controller, energy storage power battery pack, and cell management system (Battery Management System, BMS),. The grid connected inverter, bidirectional DC/DC circuit and the corresponding joint control and dispatching system of energy storage power station are introduced. The energy storage subsystem and photovoltaic subsystem and their key technologies are mainly designed and studied. The bi-directional DC/DC converter in energy storage subsystem is studied. In order to improve its efficiency, soft switching technology and three-phase interleaving and parallel circuit structure are adopted. On the one hand, it is helpful to reduce the ripple of inductance current and thus increase the power density. On the other hand, it is helpful to the selection of switching devices, so as to improve the efficiency of the converter. Several common energy storage batteries are studied, and the selection of energy storage battery is given by comparing their advantages and disadvantages. The main functions of BMS are studied, which can not only improve the battery life and utilization ratio, but also make better use of the power of the whole system. The bidirectional AC/DC converter in photovoltaic generation subsystem is studied, and the modulation method, working principle and modal analysis are given. Aiming at the application of (Power Convert System, PCS) energy bidirectional flow in power conversion system, the bidirectional AC/DC converter, bidirectional DC/DC converter and energy storage battery are modeled and simulated, and the PCS energy bidirectional flow controller is designed. In view of the grid-connected / off-grid function of the energy storage system under the new situation, the principle of PCS grid-connected / off-grid operation control and the concrete mode switching process are presented. A novel feedforward control method for voltage mode control and current mode control is proposed in this paper. This method does not have to wait until the voltage is over 00:00 before switching, which can reduce the burden of the regulator and speed up the dynamic response of the control system, so that the smooth switching between grid connection and off-grid operation can be realized. In this paper, the main circuit parameters are designed for the studied PCS, the design process and method of inductance and capacitance are given in detail, and the switch devices are selected. The loss of PCS is analyzed in detail, the results of theoretical analysis are given, and the correctness of parameter design is verified. The hardware circuit of BMS is designed and the block diagram of hardware circuit is given. The digital chip TMS320F28035 of TI company is used as the control core, and the special chip MAX 14921 is used to construct the battery measurement circuit, thus realizing the full digital control of the energy storage system. In this paper, PSIM software is used to simulate and analyze PCS and control strategy, and the experimental prototype of energy storage system is designed. The rationality of parameter design and the feasibility of control strategy are verified by simulation and experiment.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM910;TM46
本文编号：2315611
[Abstract]:The depletion of traditional energy and the environmental pollution are two problems to be solved urgently in economic development. In order to realize the sustainable development of economy, it has become a worldwide trend to develop and explore new renewable energy sources. Considering many aspects, solar energy has the most broad application prospect, so it is paid more attention by many countries. With the development of photovoltaic power generation application, energy storage system has been paid more and more attention. Through the control of energy storage, release and conversion, high reliability, high efficiency and high efficiency of energy utilization can be realized. In order to save energy and improve the environment. Therefore, the research of new energy storage system has become a hot spot in the world. In order to meet the practical requirements of new energy storage system, this paper proposes a photovoltaic module array, maximum power point tracking (Maximum Power Point Tracking, MPPT) controller, energy storage power battery pack, and cell management system (Battery Management System, BMS),. The grid connected inverter, bidirectional DC/DC circuit and the corresponding joint control and dispatching system of energy storage power station are introduced. The energy storage subsystem and photovoltaic subsystem and their key technologies are mainly designed and studied. The bi-directional DC/DC converter in energy storage subsystem is studied. In order to improve its efficiency, soft switching technology and three-phase interleaving and parallel circuit structure are adopted. On the one hand, it is helpful to reduce the ripple of inductance current and thus increase the power density. On the other hand, it is helpful to the selection of switching devices, so as to improve the efficiency of the converter. Several common energy storage batteries are studied, and the selection of energy storage battery is given by comparing their advantages and disadvantages. The main functions of BMS are studied, which can not only improve the battery life and utilization ratio, but also make better use of the power of the whole system. The bidirectional AC/DC converter in photovoltaic generation subsystem is studied, and the modulation method, working principle and modal analysis are given. Aiming at the application of (Power Convert System, PCS) energy bidirectional flow in power conversion system, the bidirectional AC/DC converter, bidirectional DC/DC converter and energy storage battery are modeled and simulated, and the PCS energy bidirectional flow controller is designed. In view of the grid-connected / off-grid function of the energy storage system under the new situation, the principle of PCS grid-connected / off-grid operation control and the concrete mode switching process are presented. A novel feedforward control method for voltage mode control and current mode control is proposed in this paper. This method does not have to wait until the voltage is over 00:00 before switching, which can reduce the burden of the regulator and speed up the dynamic response of the control system, so that the smooth switching between grid connection and off-grid operation can be realized. In this paper, the main circuit parameters are designed for the studied PCS, the design process and method of inductance and capacitance are given in detail, and the switch devices are selected. The loss of PCS is analyzed in detail, the results of theoretical analysis are given, and the correctness of parameter design is verified. The hardware circuit of BMS is designed and the block diagram of hardware circuit is given. The digital chip TMS320F28035 of TI company is used as the control core, and the special chip MAX 14921 is used to construct the battery measurement circuit, thus realizing the full digital control of the energy storage system. In this paper, PSIM software is used to simulate and analyze PCS and control strategy, and the experimental prototype of energy storage system is designed. The rationality of parameter design and the feasibility of control strategy are verified by simulation and experiment.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM910;TM46
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