面向分布式负载的模块化三端口功率系统

Power System with Modular Three-Port Converters for Distributed Loads

面向具有复杂分布式用电负载需求的航天器,提出一种基于三端口变换器(TPC)的供电系统架构及其功率控制策略。该系统以TPC为基本单元,通过将各TPC模块的输入端口和双向功率端口分别并联连接,实现输入能源、储能装置和多个分布式负载之间的供电。针对各分布式负载输出功率不同且单个TPC含有3条功率路径,可能导致系统中各传输路径功率不确定的问题,提出一种混合型系统功率控制策略以实现各模块各功率路径可控及系统功率优化管理,具体而言,即在储能装置充电工况下均衡储能装置的充电电流,在储能装置放电工况下按输出需求分配输入功率。分析和实验表明,系统可以在各工作状态下稳定运行并在各工作状态之间自由切换。

A novel power system for distributed loads （PSDL）with modular three- port converters （TPC） and its power management were proposed for spacecraft in this paper. The PSDL was composed of several TPC modules, interfacing energy source, energy storage element （ESE） and distributed loads, with the input and bidirectional ports connected in parallel, respectively. Considering that the output loads are distributed and there are three power paths in each TPC, it＇s difficult to determine the power transferred on each path of the PSDL. To achieve accurate power distribution of the multiple ports, a system level hybrid power control was proposed, i.e., current-sharing control when the ESE charges and power control based on requirements of loads when the ESE discharges. With the proposed control, the PSDL can achieve stable operations under different working states and smooth switching between them. Experimental results demonstrate the feasibility and effectiveness of the proposed system structure and hybrid power control.