配电变压器无弧有载自动调容仿真分析

Simulation analysis of arcless on-load automatic capacity regulating for distribution transformer

对配电变压器的有载自动调容技术进行了论述,提出了以电力电子开关为关键部件的无弧有载自动调容技术新方案,该方案以反并联大功率耐高压晶闸管作为调容开关,克服了机械式调容开关结构复杂、体积大、故障率高的缺点。探讨了配电变压器实现无弧有载自动调容的关键技术,利用电力系统仿真工具PSCAD/EMTDC建立了无弧有载调容方案的仿真模型,对电力电子开关实现自动调容进行了仿真分析,验证了所提方案的可行性。为农村和城市配电网配电变压器实施有效的季节性调容和峰谷调容提供了解决办法。

The technology of arcless on-load automatic capacity regulating for distribution transformer was dissertated,and technology scheme of arcless on-load automatic capacity regulating with power electronic switches was put forward.In this scheme,a kind of high-power withstand voltage thyristor with anti-parallel connection was used as capacity regulating switch,which overcame the drawbacks of mechanical switch such as complicated structure,slow regulative rate and high failure rate.The key technology of arcless on-load automatic capacity regulating of distribution transformer was discussed.Simulation model of the scheme was established using PSCAD/EMTDC.Simulation study and analysis for the shift and transition of power electronic switches were carried through,and the feasibility of this scheme was validated primarily.The results can provide solutions for the capacity regulating seasonally in country grid and peak-valley capacity regulating in city grid.