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随着新能源发电技术的快速发展,直流微网变换器并联导致的功率分配不均和母线电压控制问题引起了广泛关注。目前,直流微网的大部分均流策略依赖系统或级间通信,均流效果受通信系统的可靠性影响。该文提出一种面向多台直流变换器并联运行,基于主动电压扰动的负载均流控制策略。无需通信,各直流变换器根据扰动前后本地的电气参数获取母线负载信息,据此实现多台直流变换器负载电流的均衡分配,同时将母线电压补偿至额定值;采用主动扰动方式,对电能质量影响小而可控。通过搭建仿真和实验平台,分析了在该文均流测量下负载突变后的均流效果,仿真及实验结果验证了文中均流策略的有效性。 相似文献
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In this report,two new contact structures of a vacuum interrupter with a sinusoidal curved surface are proposed to improve the capability by increasing the surface area.The experimental investigation of vacuum arc at intermediate frequency(360-800 Hz)was conducted and the results were compared with a butt contact with the same contact diameter(41 mm)and the same material.By analyzing the arc behavior,arc voltage characteristics,arc energy,current interrupting capacity,ablation of the anode contact and condensation of the arc products at a 3 mm gap,the differences in their vacuum arc characteristics were determined.The correlations of their arc energy with the amplitude and the frequency of the current were also achieved.Analysis suggests that the ruled curved contact has strong application potentiality because of its low arc energy,low arc voltage noise and arc voltage peak,light ablation on the surface of the anode contact and high interrupting capacity. 相似文献
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