中压级联型STATCOM的控制及并联运行技术研究

发布时间：2018-04-27 05:11

本文选题：静止同步补偿器 + 级联　；参考：《中国矿业大学》2014年硕士论文

【摘要】：随着经济的发展，国家对电能质量的要求愈来愈高，而无功补偿及谐波治理问题是制约电能质量提高的关键因素。在中高压场合，STATCOM是动态无功补偿与谐波治理领域的最新技术和发展方向，其相关的控制技术一直是人们研究的热点。STATCOM装置作为电力电子电流发生补偿装置，和有源滤波器、逆变器一样，在并联运行条件下，不可避免的就是装置之间的环流问题，，尤其在中压多变压器并列运行下，母联线路上受负荷不均影响的能量流动更加剧了并联的环流问题，甚至在谐波补偿时引起STATCOM装置电流发散退出运行。本文针对中压级联型STATCOM的控制及其并联运行技术展开了相应的研究，得到一种实用的多工况STATCOM多机并联运行控制技术。本文首先从电能质量问题出发，对电网进行无功补偿和谐波治理的必要性进行了论述，并且对国内外无功补偿装置的发展历程和STATCOM装置并联技术的发展进行了简要的总结阐述。然后从STATCOM的基本原理出发，结合变电所实际的工况，对中压级联型STATCOM的主电路结构进行了详细的设计，在确定其结构的基础上对其数学模型进行了建立和并联环流进行了分析。在对STATCOM模型建立的基础上对中压级联型STATCOM的相关控制策略进行了研究，详细阐述了其调制技术、交流侧控制方法和直流侧电容电压平衡方法，并通过相关的理论仿真验证，证明了所采用控制方法的可靠性和优越性。针对中压级联型STATCOM装置在变电所并联运行的相关问题，对中压级联型STATCOM装置的并联运行技术进行了深入的研究，提出一种适合于多工况的基于改进型相同电流采样的STATCOM并联运行控制技术，并通过MATLAB进行相关的模型仿真分析，验证了该控制方法的稳定性和实用性。文章进一步对中压级联型STATCOM装置并联系统进行了详细的软、硬件设计，最后通过两台±3.0Mvar的中压级联型STATCOM样机对上述相关技术研究进行了实际的实验测试和应用效果分析，验证了本文所做中压级联型STATCOM相关技术研究设计的有效性和实用性。
[Abstract]:With the development of economy, the demand for power quality is becoming higher and higher. Reactive power compensation and harmonic control are the key factors restricting the improvement of power quality. Statcom is the latest technology and development direction in the field of dynamic reactive power compensation and harmonic control in the middle and high voltage field. The related control technology of Statcom is always a hot spot in people's research. Statcom is used as power electronic current compensation device and active power filter. The inverter is the same, under the condition of parallel operation, the circulation problem between the devices is inevitable, especially in the parallel operation of the medium voltage multi-transformer, the energy flow on the bus line is affected by the uneven load, which exacerbates the circulation problem of the parallel connection. Even in the harmonic compensation caused by the STATCOM device current divergence out of operation. In this paper, the control of cascaded STATCOM and its parallel operation technology are studied, and a practical multi-mode STATCOM parallel operation control technology is obtained. In this paper, the necessity of reactive power compensation and harmonic control is discussed, and the development history of reactive power compensator at home and abroad and the development of parallel technology of STATCOM are briefly summarized. Then, according to the basic principle of STATCOM and the actual working conditions of the substation, the main circuit structure of the medium-voltage cascaded STATCOM is designed in detail, and its mathematical model is established and the parallel circulation is analyzed on the basis of determining its structure. Based on the establishment of STATCOM model, the related control strategies of medium voltage cascaded STATCOM are studied. The modulation technology, AC side control method and DC side capacitor voltage balance method are described in detail. The reliability and superiority of the control method are proved. Aiming at the problems related to the parallel operation of the medium-voltage cascaded STATCOM device in the substation, the parallel operation technology of the medium-voltage cascaded STATCOM device is deeply studied. An improved parallel operation control technique for STATCOM based on the same current sampling is proposed in this paper. The stability and practicability of the control method are verified by the model simulation analysis of MATLAB. In this paper, the hardware and software of the parallel system of the medium-voltage cascaded STATCOM device are designed in detail. Finally, the experimental test and application effect analysis of the above related technology are carried out through two 卤3.0Mvar cascaded STATCOM prototypes. The effectiveness and practicability of the research and design of the intermediate voltage cascade STATCOM related technology are verified.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761

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