【作者】 唐政；

【导师】 李建明；

【作者基本信息】 山东大学 ， 电力电子与电力传动， 2009， 硕士

【摘要】 随着工业自动化水平的不断提高,电力用户对供电质量和可靠性越来越敏感。目前,电力系统存在无功补偿容量不足,而系统中又存在不断增加的无功负荷,特别是冲击性无功负荷,不仅增加了损耗,而且严重影响了用户端的电能质量。配电网静止同步补偿器（D-STATCOM）是动态无功补偿装置的重要一员,由于良好的补偿性能,能跟踪补偿配电网的无功,还可减少冲击负荷对配电网的冲击。而变流器及其控制策略的研究是D-STATCOM技术研究的核心部分,对主回路及控制策略的研究必能更好的改善STATCOM的效果,具有现实意义。论文就三相三线D-STATCOM变流器的主回路结构及其工作方式进行了研究,对影响其补偿容量、输出纹波和直流侧纹波的各个相关因素和参数进行了数学分析和实验。提出了交错驱动控制的主回路结构和控制方法,并通过数学分析和实验,证明其在输出纹波、直流侧纹波、补偿容量方面较传统的三相三线变流器结构及对应的PWM工作方式具有明显优势。对STATCOM变流器装置级控制策略进行了研究,对直接电流控制和间接电流控制的常用方法进行了研究,讨论了STATCOM工作在方波模式和PWM模式下所采用的控制方法。介绍了逆系统法和微分几何法两种应用于非线性系统的控制方法。对直接电流控制的方法进行了总结,提出本设计所采用的控制方法。建立电压型逆变器的标幺化模型,详细分析额定无功补偿容量Q_N和允许输出的最大纹波I_纹波这两个装置的性能参数,与主回路参数之间的关系;主回路参数包括直流侧工作电压U_dc、串联抗值L和载波比n之间的制约关系。在对交错驱动并联结构变流器进行主回路参数进行对比设计发现,交错驱动并联桥式结构在参数设计中,L、U_dc、n三者之间的制约关系相对较小。这为主回路参数的选择提供了更大的余地,而且比起传统的PWM控制方式,其更容易实现优良的系统性能。建立装置的各个环节模型,应用线性系统的典型Ⅰ型系统、典型Ⅱ型系统的控制理论,对直接电流控制的电流调节器和电压调节器参数进行设计,并用仿真加以验证,提出了数字化实现方案。最后对研制样机进行了试验。通过试验波形可以看出采用交错驱动技术的D-STATCOM相比于传统的D-STATCOM,在减小输出纹波和直流侧纹波方面有明显的优势。更多还原

【Abstract】 With the improvement of industry, the power customer are more and more particular about the power supply quality and dependability. At present, the reactive load, especially the impulsive reactive load, it not only increases power loss but also seriously deteriorates the power quality of customers. Distribution network for Static Synchronous Compensator （D-STATCOM） is an important one of dynamic reactive power compensation devices, because of it good compensation performance can be tracked compensation of reactive power distribution network, and also can reduce the impact of loading on the impact of distribution network. The core research of D-STATCOM technology is the converter and its control strategy.This paper presents some control strategy, introduces inverse system method and differential geometry method, especially introduces direct current control method. This paper presents different direct-current control method.STATCOM converter device-level control strategy have been studied for direct current control and indirect current control of the commonly used methods of study, discussion of the STATCOM in the square wave mode and PWM mode control method used. Introduced two type of the inverse system method and differential geometry which using in the nonlinear systems. Summing up the method of the direct current control, presenting the control method that using in the paper.The establishment of voltage source inverter per-unit of the standard model, analysis the performance of the two device parameters of the rated capacity of reactive power compensation Q_N and the maximum output ripple I_纹波, the relationship with the main circuit parameters; the main circuit parameters including the work of DC side voltage U_dc, series resistance value L and the carrier ratio n and the constraints of these numbers. In parallel to the staggered structure of multi-drive converter main circuit parameters for the design found in contrast, multi-drive staggered parallel design bridge structure, the constraints relationship of these are relatively small. This is provide more choice for the select of the mainly circuit parameters, comparing to traditional PWM control method, its easier to obtain good system performance.By the research of main circuit structure and control method about multi-drive staggered control, the main circuit parameters are designed for four-drive staggered to control device, and main circuit devices are selected. Control system is realized with the digital device, the steady-state characteristics and dynamic characteristics are verified by simulation of the control system.Establishment all aspects of the device models, application the typical linear I systems and the typical type II system control theory, direct current control of the current regulator and voltage regulator design parameters, and to verify the simulation and control system part of the realization of specific programs.Finally, the development of the prototype was tested. Test waveform can be seen through a multi-staggered drive D-STATCOM technology compared to conventional D-STATCOM, which have a distinct advantage in reducing the output ripple and ripple DC.更多还原