中文摘要：

针对电力系统面临的新问题和配电网含多条馈线的特殊结构,提出一种基于Zigzag变压器的中压配电网交直流同导线配电方案,设计出交直流同线配电网络拓扑图。在不改变原有线路参数和结构的前提下,分析交流直流叠加方法,计算实现线路最大功率配送的条件,仿真验证了方案的可行性。考虑电源和负荷交流直流分量不同比例情况下,对比分析交直流同线配电与传统交流配电方案的经济性。仿真结果表明,利用Z（Zigzag曲折绕组）型变压器实现中压配电网交直流同线配电方案可行;算例分析表明方案能够提升线路配电容量,缓解现存交流配网供配电紧张的局面,经济性分析结果为交流直流电源和负荷并存的配网采用何种配电方式提供了依据。此方案为分布式电源和逐渐增多的直流负荷接入配电网提供了一种思路。

英文摘要：

Aiming at new problems occurring in power system and special structure of distribution network with multiple feeders, this paper puts forward simultaneous AC-DC system scheme based on zigzag transformer and designs AC-DC distribution network topology. Under premise of not changing original AC line insulation and structure, AC-DC superposition method is analyzed, maximum power transmitted is calculated and feasibility of the scheme is verified with simulation in this paper. Considering different proportions of AC and DC component of power source and load, economy between AC-DC and traditional AC power distribution system is analyzed comparatively. Simulation results show feasibility of distribution scheme in MV distribution network with zigzag transformer. Calculation example shows that the scheme could improve transmission capacity of distribution lines and alleviate tense situation of power supply and distribution. Economic analysis provides basis for choosing distribution mode for distribution network with AC-DC source and load. The scheme provides a new solution for distributed generation and continuously increasing DC load access to distribution network.