【作者】 高明；

【导师】 刘震； 王大志；

【作者基本信息】 东北大学 ， 电力电子与电力传动， 2018， 硕士

【摘要】 随着国家大力倡导和推行新能源技术在光伏发电、电动汽车、备用电源等方面的应用,以新能源技术为主的分布式发电技术得到了快速的发展,其清洁、高效的节能优势越来越突显。能量存储系统作为分布式发电装置中的关键部分,对于提高分布式发电系统的可靠性具有重要意义。其中,储能系统中的双向直流变换器作为实现能量在储能器件和供电网络间的传输关口,更是储能系统的重要构成部分,其性能的优劣将直接影响储能系统的整体性能,进而影响到分布式发电系统的工作效能,因此对双向直流变换器的研究和设计具有重要意义。本文的研究与设计思路可分为功率、控制两方面:在功率方面,首先按照电气隔离需求,对现有资料中提到的多种双向直流变换器的拓扑结构进行了分类研究和优缺点分析;在控制方面,对直流变换器的各种通用和新型控制方法进行了介绍,研究了各种控制方法在直流变换器中应用的优势与不足。根据应用对象的特点,确定双有源全桥结构作为本文设计的双向直流变换器的功率回路,并采用滑模控制技术设计双向直流变换器的闭环控制器。对于本文设计的双向直流变换器,首先对其工作原理、调制策略和数学模型进行了详细的分析研究。针对变换器所需实现的双向电压匹配,分别采用移相PWM调制策略、双极性PWM调制策略来分配降压、升压工作模式的开关控制极电压的时序。通过搭建Simulink仿真模型,对拓扑结构和调制策略进行了仿真验证。继而,建立变换器的状态空间模型,并简化电路推导出降压和升压模式下的变换器等效控制模型。根据等效模型,结合滑模变结构控制方法,完成了双向直流变换器的PWM滑模控制器设计,并通过仿真对控制器的有效性进行了验证。本文对双向直流变换器的硬件电路和软件程序的实现进行了详细设计。制作了一台额定输出功率为5kW的实验样机并搭建了实验平台。通过该实验平台完成了 270V-28V电压双向转换的相关实验。实验结果表明,本文设计的隔离型双向直流变换器能够很好地实现电压双向匹配,其性能满足相关的应用指标。同时,实验中将本文设计的PWM滑模控制器与传统的PID控制器进行控制效果的对比,结果表明本文所采用的控制器能够有效的提升双向直流变换器的鲁棒性能和动态品质。更多还原

【Abstract】 As the state vigorously advocates and implements the application of new energy technologies in photovoltaic power generation,electric vehicles and backup power sources,the distributed generation technology mainly based on new energy technology has been developed rapidly,and its clean,efficient energy-saving advantage is more and more outstanding.As a key part of distributed generation system,energy storage system is of great significance to improve the reliability of distributed generation system.The bidirectional DC/DC converter in energy storage system is an important part of energy storage system,as the flow pass between energy storage devices and power supply networks.Its performance will directly affect the overall performance of the energy storage system,and thus affect the distributed generation system performance,so the study of the bidirectional DC/DC converter particularly important.The research and design idea of this paper can be divided into two aspects:power and control.In terms of power,the topological structure of various bidirectional direct current converters mentioned in the existing data is studied in accordance with the requirements of electrical isolation,and the advantages and disadvantages of each type topology are analyzed in detail.In terms of control,various general and new control methods of DC/DC converter are summarized,and the advantages and disadvantages of various control methods in DC/DC converter are studied in detail.According to the characteristics of the application object,determine the structure of dual active bridge as the power circuit of bidirectional DC/DC converter designed in this paper,which use the technology of sliding mode control design of bidirectional DC/DC converter loop controller.In this paper,the working principle,modulation strategy and mathematical model of bidirectional DC/DC converter are analyzed and studied.The phase-shifted PWM modulation strategy and bipolar PWM modulation strategy are adopted to match the bidirectional voltage matching required by the converter.By building Simulink simulation model,the topology and modulation strategy are simulated.On this basis,the state space model of the converter is established,and the equivalent control model of converter is derived by simplifying the circuit.Based on the equivalent model,the design of sliding mode controller of bidirectional DC/DC converter is completed according to the sliding mode variable structure control method,and the effectiveness of the controller is verified by simulation.At last,the hardware circuit and software program of the bidirectional DC/DC converter are designed in detail.A 5kW experimental prototype is made and the experimental platform was built.The experimental platform has completed the experiment of 270V-28V voltage two-way conversion.The experimental results show that the bidirectional direct-current converter designed in this paper can realize the bidirectional conversion of voltage,and its performance can satisfy the related application indexes.At the same time,the experiment,the proposed PWM sliding mode controller are compared with those of the control effect of traditional PID controller,proved in this paper,the designed controller can effectively improve the robustness of the bidirectional DC/DC converter and dynamic quality.更多还原