级联型H桥储能功率转换系统控制策略研究
发布时间：2018-09-18 21:16
【摘要】：可再生能源发电功率的波动性和间歇性给电力系统的稳定运行带来了巨大的挑战,需要储能功率转换系统(Power Conversion System,PCS)提供备用容量来实现电网的动态供需平衡。级联型H桥储能功率转换系统是用于高压大容量系统中的主要拓扑结构,可与不同储能介质相结合,在大容量储能场合有广阔的应用空间。本文以级联型H桥储能功率转换系统为研究对象,对其控制策略进行了深入的研究,并对实验装置的软硬件进行设计。本文以级联型H桥变换器的单相等效电路为例分析了级联型H桥PCS的工作原理。级联型H桥PCS的数学模型是控制策略设计的基础,建立了 abc、αβ和dq坐标系下的数学模型,并给出了复频域下的表达式。本文采用水平载波移相调制策略,详细阐述了调制规律,具体分析了级联型H桥单相交流侧输出电压。本文重点对储能介质为蓄电池的级联型H桥PCS控制策略进行了研究,对储能介质为超级电容的级联型H桥PCS控制策略进行简要概述。在级联型H桥PCS数学模型的基础上,采用基于PI调节器的电流前馈解耦控制策略对系统的有功功率进行控制,实现了蓄电池组的充放电。采用零序电压注入法实现了相间SOC均衡,采用基波电压注入法实现了相内SOC均衡。文中具体分析了两种方法能实现均衡的原因,并给出了零序电压和基波电压的产生形式。容错控制能够保证系统在故障情况下仍能可靠运行,本文从保证故障情况下输出线电压对称和非故障单元SOC均衡两个方面进行理论分析,简要介绍了容错控制策略。本文依据工业级平台的设计原则,搭建了 10kW小型实验样机,完成了驱动板电路的设计,实现了驱动功率器件和采样每个功率单元直流侧蓄电池组电压的功能。完成了电压采样板电路的设计,实现了对AD7656时序的控制,蓄电池组电压和驱动信号的编解码功能。完成了主控制板和底板电路的硬件设计,采用双"DSP+FPGA"架构实现了 SOC的采集,控制算法和调制策略的功能。最后,通过MATLAB仿真,验证了控制策略的有效性。
[Abstract]:The fluctuation and intermittency of power generation from renewable energy bring great challenges to the stable operation of power system. It is necessary to provide reserve capacity for the storage power conversion system (Power Conversion System,PCS) in order to achieve the dynamic balance between supply and demand of power grid. Cascaded H-bridge energy storage power conversion system is the main topology used in high-voltage and high-capacity systems. It can be combined with different energy storage media and has a wide application space in large capacity energy storage field. In this paper, the control strategy of cascaded H-bridge energy storage power conversion system is studied, and the hardware and software of the experimental device are designed. In this paper, the principle of cascaded H-bridge PCS is analyzed by taking the single-phase equivalent circuit of cascaded H-bridge converter as an example. The mathematical model of cascaded H-bridge PCS is the basis of control strategy design. The mathematical model of abc, 伪 尾 and dq coordinate system is established, and the expression in complex frequency domain is given. In this paper, the horizontal carrier phase shift modulation strategy is used to describe the modulation law in detail, and the output voltage of single-phase AC side of cascaded H-bridge is analyzed in detail. In this paper, the control strategy of cascaded H-bridge PCS with storage medium as storage battery is studied, and the PCS control strategy of cascaded H-bridge with super capacitor is briefly summarized. Based on the PCS mathematical model of cascaded H-bridge, the current feedforward decoupling control strategy based on PI regulator is used to control the active power of the system, and the charge and discharge of the battery is realized. Phase SOC equalization is realized by zero-sequence voltage injection method, and SOC equalization is realized by fundamental voltage injection method. In this paper, the reasons why the two methods can realize equalization are analyzed in detail, and the generation forms of zero sequence voltage and fundamental voltage are given. Fault-tolerant control can guarantee the reliable operation of the system under the condition of fault. This paper analyzes the output line voltage symmetry and the non-fault unit SOC equalization under the condition of fault, and briefly introduces the fault-tolerant control strategy. According to the design principle of industrial platform, a small experimental prototype of 10kW is built, and the design of driving board circuit is completed. The function of driving power device and sampling DC side battery voltage of each power unit is realized. The circuit of voltage sampling board is designed, and the control of AD7656 sequence, the coding and decoding function of battery voltage and driving signal are realized. The hardware design of the main control board and the backboard circuit is completed, and the functions of the SOC acquisition, control algorithm and modulation strategy are realized by using the double "DSP FPGA" architecture. Finally, the effectiveness of the control strategy is verified by MATLAB simulation.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
[Abstract]:The fluctuation and intermittency of power generation from renewable energy bring great challenges to the stable operation of power system. It is necessary to provide reserve capacity for the storage power conversion system (Power Conversion System,PCS) in order to achieve the dynamic balance between supply and demand of power grid. Cascaded H-bridge energy storage power conversion system is the main topology used in high-voltage and high-capacity systems. It can be combined with different energy storage media and has a wide application space in large capacity energy storage field. In this paper, the control strategy of cascaded H-bridge energy storage power conversion system is studied, and the hardware and software of the experimental device are designed. In this paper, the principle of cascaded H-bridge PCS is analyzed by taking the single-phase equivalent circuit of cascaded H-bridge converter as an example. The mathematical model of cascaded H-bridge PCS is the basis of control strategy design. The mathematical model of abc, 伪 尾 and dq coordinate system is established, and the expression in complex frequency domain is given. In this paper, the horizontal carrier phase shift modulation strategy is used to describe the modulation law in detail, and the output voltage of single-phase AC side of cascaded H-bridge is analyzed in detail. In this paper, the control strategy of cascaded H-bridge PCS with storage medium as storage battery is studied, and the PCS control strategy of cascaded H-bridge with super capacitor is briefly summarized. Based on the PCS mathematical model of cascaded H-bridge, the current feedforward decoupling control strategy based on PI regulator is used to control the active power of the system, and the charge and discharge of the battery is realized. Phase SOC equalization is realized by zero-sequence voltage injection method, and SOC equalization is realized by fundamental voltage injection method. In this paper, the reasons why the two methods can realize equalization are analyzed in detail, and the generation forms of zero sequence voltage and fundamental voltage are given. Fault-tolerant control can guarantee the reliable operation of the system under the condition of fault. This paper analyzes the output line voltage symmetry and the non-fault unit SOC equalization under the condition of fault, and briefly introduces the fault-tolerant control strategy. According to the design principle of industrial platform, a small experimental prototype of 10kW is built, and the design of driving board circuit is completed. The function of driving power device and sampling DC side battery voltage of each power unit is realized. The circuit of voltage sampling board is designed, and the control of AD7656 sequence, the coding and decoding function of battery voltage and driving signal are realized. The hardware design of the main control board and the backboard circuit is completed, and the functions of the SOC acquisition, control algorithm and modulation strategy are realized by using the double "DSP FPGA" architecture. Finally, the effectiveness of the control strategy is verified by MATLAB simulation.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
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