【作者】 薄志刚；

【导师】 曾光；

【作者基本信息】 西安理工大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 本文主要研究了基于数字信号处理器(DSP)的静止同步补偿器(STATCOM)。首先简要介绍了无功补偿技术的发展,分析比较了STATCOM与传统无功补偿装置的区别及其优势,并对STATCOM的发展以及国内外的研究现状进行了叙述。然后从电路结构上分析了STATCOM的基本原理和工作特点,并详细叙述采用电压型桥式电路的STATCOM工作原理,通过分析,利用开关函数法建立了适用于直接电流控制的STATCOM的数学模型。推导了基于广义瞬时无功功率理论的无功电流检测的具体过程。介绍了已有的几种控制策略,着重介绍了本文采用的直接电流控制策略。脉冲波的发生采用直流侧电压利用率高、开关损耗小、谐波含量低的空间电压矢量PWM(SVPWM)调制方式。最后,建立了一个STATCOM实验系统,采用以DSP为控制核心的硬件平台,包括采样电路、保护电路、驱动电路等外围电路,编制了相应的软件,完成了试验样机的联调。仿真和实验结果表明基于直接电流控制算法的STATCOM控制器不仅可以实现对无功功率的实时补偿,而且具有较好的响应速度和补偿精度。总的看来,此方法具有一定的先进性和合理性,可应用于工程实践。论文的最后,给出了实验实测波形。更多还原

【Abstract】 The controller used in Static Synchronous Compensator (STATCOM) based on Digital Signal Processor (DSP) is mainly studied in this paper. In the first instance, a general description of the development of var compensation technique during recent years is given. The difference between STATCOM and traditional var compensators is compared and the predominance of STATCOM is analyzed. The study of STATCOM in home and abroad recently is recounted. The operation principle of STATCOM based on voltage type circuit is particularly analyzed in this paper. The mathematical model of STATCOM based on switching transfer functions is built. The concrete process of detecting reactive current using the method of ’d-q calculation’ of transient reactive power theory has been deduced. Some general control strategies were researched and the direct-current control method is used in this paper. SVPWM modulation mode with which the DC voltage utilization ratio is high, the switch wastage is small and the harmonic content is low is adopted in producing the pulse wave.An experimental STATCOM system based on TMS320LF2407A DSP is built which includes sampling circuit, protecting circuit, driving circuit and so on. The program of the system is compiled. The simulation and experimental results show that the STATCOM controller can compensate Var on real time.and has preferable controlling precision. In a word, the STATCOM controlling method can be used in the project which is reasonable and advanced. In the end of this paper, the corresponding real waves are provided.更多还原