智能配电变压器发展趋势分析

智能配电变压器是智能电网快速发展背景下构建新一代配电网的关键部件。结合新能源分布式电源、交直流混联配电网的发展趋势,文中分析了智能配电变压器的主要功能,指出实现智能配电变压器的关键在于利用电力电子技术使配电变压器具备丰富的控制功能。在此基础上,分析指出电力电子变压器(PET)与混合式配电变压器(HDT)是智能配电变压器的两类可选方案。对PET与HDT的工作原理进行说明,列出基于PET,HDT及扩展型HDT的智能配电变压器的几种典型应用电路,并对其特点进行定性分析。基于一种具体的配电网应用场景,从工作原理、可靠性、经济性、可控性等方面对基于PET与HDT的智能配电变压器进行对比,并定性给出当变换功率比重增大时二者各项性能的变化规律。最后分析了智能配电变压器未来的发展趋势。

Analysis of Development Trend for Intelligent Distribution Transformer

Intelligent distribution transformer is a key device to construct the new generation of intelligent distribution network with the rapid development of smart grid. This paper analyzes the main functions of the intelligent distribution transformer combining the development trend of the distributed generation of renewable power and AC/DC hybrid distribution power system, and states that the key of realizing the intelligent distribution transformer is the high controllability, which can be achieved by utilizing the power electronic devices. Based on this, the analysis shows that the power electronic transformer (PET) and hybrid distribution transformer (HDT) are two alternative circuit schemes for the intelligent distribution transformer. The basic working principle of PET and HDT are introduced, and the several typical topologies of the intelligent distribution transformer based on PET, HDT and the extended HDT are presented and their characteristics are analyzed. Based on a specific application scenario in the distribution network, the working principle, reliability, economy, controllability of the intelligent distribution transformer based on PET and HDT are compared, and the variation trend of each performance is presented when the ratio of the conversion power increases. Finally, the future development trend of the intelligent distribution transformer are analyzed.