新型智能变压器在中压配电系统的运行与控制

Operation and Control of New Intelligent Transformer in Medium Voltage Distribution System

智能变压器(ST)是一种基于电力电子的变压器,并配备有控制和通信功能,但其在中压(MV)配电系统中的运行特性研究甚少。鉴于此,提出一种ST的操作和控制方法,以提高其位于城市中两个辐射状馈线组成的配电系统中的性能。为了研究上述系统ST的性能,一个传统的电力变压器(CPT)被ST取代,而另一条馈线继续通过CPT供电。在该方案中,ST的运行使得系统的总电网电流呈现为具有单位功率因数的正弦波形。此外,所提方案消除了馈线上改善电能质量设备的需要。因此,该方案也使得ST在配电系统更具经济效益。最后,仿真结果验证了ST在提高多馈线中压配电系统性能方面的实用性。

Smart transformer(ST)is a kind of transformer based on power electronics and equipped with control and communication functions,but its operation characteristics in medium voltage(MV)distribution system are rarely studied.In view of this,an operation and control method of ST is proposed to improve its performance in the distribution system composed of two radial feeders in the city.In order to study the performance of the above system ST,a conventional power transformer(CPT)is replaced by ST,while the other feeder continues to supply power through CPT.In this scheme,the operation of ST makes the total grid current of the system present a sinu-soidal waveform with unit power factor.In addition,the proposed scheme eliminates the need to improve power quality equipment on the feeder.Therefore,the proposed scheme also makes ST more economical in the distribution system.Finally,the simulation results verify the practicability of ST in improving the performance of multi feeder medium voltage distribution system.