基于Zig-Zag变压器的独立异步发电系统控制

发布时间：2018-03-14 18:16

本文选题：异步发电机　切入点：稳压稳频　出处：《广西大学学报(自然科学版)》2014年06期 　论文类型：期刊论文

【摘要】：针对独立异步发电机加载后电压和频率跌落的特点,设计了一种带储能系统的静止同步补偿器(STATCOM)并联补偿异步发电机,以维持带载后机端电压和频率的稳定;在三相四线系统中采用Zig-Zag变压器重构中性点,为零序电流提供通路;同时,为避免因机端电压不平衡可能会产生的大量定子负序电流致使发电机异常运行的情况,可在逆变器脉宽调制三相调制参考电流波中注入相应的负序分量来抵消。MATLAB/Simulink的仿真结果表明,该控制方法能够有效改善异步发电机的端口特性;系统在Y/yn变压器的仿真结果更说明了三相负载不对称较严重时采用Zig-Zag变压器具有平衡系统电压、抑制零序电流等优越性。
[Abstract]:According to the characteristics of voltage and frequency drop after loading, a static synchronous compensator (STATCOM) parallel compensation asynchronous generator with energy storage system is designed to maintain the stability of terminal voltage and frequency. In the three-phase four-wire system, Zig-Zag transformer is used to reconstruct the neutral point to provide the path for the zero-sequence current, and to avoid the abnormal operation of the generator caused by a large number of stator negative sequence currents caused by the unbalanced terminal voltage. The simulation results of MATLAB / Simulink show that the proposed control method can effectively improve the port characteristics of asynchronous generators by injecting the corresponding negative sequence components into the three-phase modulation reference current wave of inverter pulse width modulation. The simulation results of MATLAB / Simulink show that the proposed control method can effectively improve the port characteristics of asynchronous generators. The simulation results of Yryn transformer show that the Zig-Zag transformer has the advantages of balancing the system voltage and suppressing the zero sequence current when the three-phase load asymmetry is serious.
【作者单位】：广西大学电气工程学院;
【基金】：国家自然科学基金资助项目(51177018) 南宁市科学研究与技术开发计划项目(20131048)
【分类号】：TM31

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