复杂多端柔性直流电网源网限流设备协同优化配置

利用源网限流设备协同优化配置解决复杂多端柔性直流电网的故障电流抑制难题,成为相关领域的研究热点.首先,结合模块化多电平换流器(MMC)与电网的耦合程度,提出适用于复杂多端柔性直流电网的区域划分原则,以提高多端柔性直流电网限流设备参数优化的计算效率;然后,根据各区域的限流需求,结合MMC、直流变压器、限流电抗器及故障限流...

Collaborative optimal configuration of current limiting devices at source and network sides in complex multi-terminal flexible DC power grid

To solve the problem of fault current suppression in complex multi-terminal flexible DC power grid by using the collaborative optimal configuration of current limiting devices at source and network sides has become a research hotspot in related fields. Firstly, according to the coupling degree of MMC(Modular Multi-level Converter) and power grid, the regional division principle suitable for complex multi-terminal flexible DC power grid is proposed to improve the calculation efficiency of parameter optimization of current limiting devices in the multi-terminal flexible DC power grid. Then, according to the current limi-ting requirements of each region, combined with the current limiting mechanism of key devices at source and network sides, such as MMC, DC transformer, current limiting reactor, fault current limiter, and so on, the typical configuration schemes of current limiting devices in each region are proposed. On this basis, the parameters of current limiting devices in different areas are hierarchically optimized. Finally, a six-terminal DC power grid is built based on PSCAD/EMTDC platform, and combined with the specific topology structures of fault current limiter, the effectiveness of the proposed hierarchical optimization method for current limiting device parameters at source and network sides is verified. The simulative results show that the proposed method can realize the collaborative current limiting of devices at source and network sides, reduce the current limiting pressure of devices at network side, and improve the calculation efficiency of device parameter optimization.