级联H桥静止同步补偿器关键技术研究与设计

发布时间：2018-05-31 01:06

  本文选题：级联H桥 + 静止同步补偿器(STATCOM)　； 参考：《西安电子科技大学》2014年硕士论文

【摘要】：近年来随着我国科技与经济的发展,如电气化铁路、钢铁冶炼等非线性或者冲击性负荷增加快速,致使配电网发生电压畸变的情况增加,电能质量下降,电能损耗增加,并会对各种敏感设备造成不利影响。光伏、风力等新能源发电的大规模兴建,容易造成接入点配电网系统的大幅度扰动,这都需要大量动态无功以支撑其电压稳定。解决上述问题,务必加强配电网电压的控制能力,增加其动态无功补偿设备,因此动态无功补偿装置就发挥了重要的作用。静止同步补偿器(STATCOM)以其补偿范围宽、快速响应、多样化的补偿功能以及占地面积小的优越性正在取代传统无功补偿装置(SVC)等,应用前景广阔,是当前无功补偿领域的研究热点。本文就当前STATCOM研究近况,对整个系统做了全面的设计,并对其控制策略和直流侧电容电压均压控制技术进行了研究。该篇文章研究设计的内容与取得的进展性成果为:1.对静止同步补偿器的拓扑结构与调制技术作了研究。对比分析了常用多电平变换器的拓扑结构和调制技术,通过对系统应用场合以及功能的要求,选择了星型连接的H桥级联多电平结构和载波相移脉宽调制技术(CPS-SPWM)。2.对静止同步补偿器控制策略和直流侧电容电压均压控制技术进行了研究。首先对系统总体控制策略提出改进,在采用前馈解耦控制基础上,并对其在生成调制信号时,通过Park反变换进行优化。然后通过分层控制思想,采用叠加纯有功电压矢量的方法来均衡各个电容上的电压平衡。最后对控制策略和均压控制技术通过Matlab/Simulink进行了仿真验证,仿真结果表明,控制效果良好有效,与不加均衡控制对比分析,平衡控制达到了明显的控制效果。3.对系统的硬件电路和软件电路进行了设计。硬件部分主要有:信号采样调理电路、DSP与FPGA控制电路。对STATCOM系统的软件做了编写并介绍了软件工作流程的实现。4.最后对STATCOM系统主电路器件型号与参数作了研究,并搭建了小电压实验模型,实验验证了硬件与软件设计的可行性和正确性。
[Abstract]:In recent years, with the development of science and technology and economy in China, such as electrified railway, iron and steel smelting and other nonlinear or impact load increases rapidly, resulting in an increase in distribution network voltage distortion, power quality decline, power loss increased. And will have a negative impact on a variety of sensitive equipment. The large-scale construction of new energy generation such as photovoltaic, wind power and so on, can easily lead to large disturbance of access point distribution network system, which requires a large number of dynamic reactive power to support its voltage stability. To solve the above problems, it is necessary to strengthen the control ability of distribution network voltage and increase its dynamic reactive power compensation equipment, so the dynamic reactive power compensation device plays an important role. Static synchronous compensator (STATCOM), with its wide compensation range, rapid response, diversified compensation functions and small area, is replacing the traditional reactive power compensator (SVCC), and has a broad application prospect, which is the research hotspot in the field of reactive power compensation at present. In this paper, the overall design of the whole system is given, and the control strategy and the voltage equalizing control technology of the DC side capacitor voltage are also studied. The content of the research and design in this article and the progressive results obtained are: 1. 1. The topology and modulation technology of static synchronous compensator are studied. The topology and modulation techniques of common multilevel converters are compared and analyzed. The star connected H bridge cascade multilevel structure and carrier phase shift pulse width modulation (CPS-SPWM. 2) are selected according to the requirements of system applications and functions. The control strategy of static synchronous compensator and the voltage-sharing control technology of DC-side capacitor are studied. Firstly, the overall control strategy of the system is improved. Based on the feedforward decoupling control, the modulation signal is optimized by Park inverse transformation. Then the method of superposition of pure active voltage vector is used to equalize the voltage balance of each capacitor by the idea of hierarchical control. Finally, the control strategy and voltage sharing control technology are simulated by Matlab/Simulink. The simulation results show that the control effect is good and effective. Compared with the control without equalization, the balance control achieves a significant control effect of .3. The hardware circuit and software circuit of the system are designed. The hardware includes: signal sampling and conditioning circuit and FPGA control circuit. The software of STATCOM system is written and the realization of software workflow is introduced. 4. Finally, the model and parameters of the main circuit of STATCOM system are studied, and a small voltage experimental model is built, which verifies the feasibility and correctness of the hardware and software design.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761

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本文编号：1957627