并联三相逆变器环流的双变零矢量控制研究

发布时间：2018-01-05 09:38

本文关键词：并联三相逆变器环流的双变零矢量控制研究　出处：《电力系统保护与控制》2017年21期 　论文类型：期刊论文

【摘要】：并联三相逆变器的参数不可避免地存在差异,导致逆变器间会产生环流。环流会造成逆变器损耗增加、输出电压、电流波形畸变等危害。为了解决这个问题,提出通过零序占空比来抑制环流的控制策略。在建立零序环流数学模型的基础上,针对传统零序环流控制策略中基于空间矢量脉宽调制(SVPWM)算法中一个载波周期内仅单次调节零矢量的作用时间,导致环流抑制效果不佳的问题,提出在一个载波周期内进行两次零矢量作用时间调节,提高零序环流控制实时性;并基于各逆变器输出的瞬时功率反馈来实现并联逆变器负载功率自适应均分的控制方案。该方案不仅能够很好地抑制环流,实现负载均分,而且能显著地改善三相逆变器输出电压和电流波形。通过仿真和半实物仿真实验平台验证了该方案的有效性。
[Abstract]:There are inevitable differences in the parameters of the parallel three-phase inverter, which leads to the circulation of the inverter. The circulation will cause the inverter loss increase, output voltage, current waveform distortion and so on. In order to solve this problem. The control strategy of zero sequence duty cycle is put forward, and the mathematical model of zero sequence circulation is established. In the traditional zero-sequence circulation control strategy based on SVPWM-based space vector pulse width modulation (SVPWM) algorithm, the time of zero vector is adjusted only once in a carrier cycle, which leads to the problem that the effect of circulation suppression is not good. In order to improve the real time of zero sequence circulation control, two zero vector time regulation is proposed in one carrier cycle. Based on the instantaneous power feedback of each inverter, the adaptive load power sharing control scheme of parallel inverter is realized, which can not only suppress the circulation but also achieve load equalization. Moreover, the output voltage and current waveform of three-phase inverter can be significantly improved, and the effectiveness of the proposed scheme is verified by simulation and hardware-in-the-loop simulation experiment platform.
【作者单位】：武汉理工大学自动化学院;神龙汽车有限公司;
【基金】：国家自然科学基金资助项目(61374050)~~
【分类号】：TM464
【正文快照】： This work is supported by National Natural Science Foundation of China(No.61374050).随着新能源发电系统的功率逐渐增大,单台逆变器往往难以满足实际的功率需求,目前逆变器模块化并联运行是一种有效的解决方法。这种方法不仅可以灵活地配置逆变系统的功率容量,而且可以

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