UI-RI Hybrid Lookup Table Method With High Linearity and High-Speed Convergence Performance for FPGA-Based Space Solar Array Simulator

作者：Jin, Shanshan; Zhang, Donglai^*; Wang, Chao

来源：IEEE Transactions on Power Electronics, 2018, 33(8): 7178-7192.

DOI：10.1109/TPEL.2017.2757038

• High dynamic performance
• I-V curve
• linear power stage
• lookup table method
• multilevel tracking converter
• solar array simulator

Most existing high-power solar array simulators are suitable for simulating solar array energy sources in terrestrial applications. However, they are not sufficiently fast for spacecraft power-system testing using terrestrial testing applications. This paper proposes a UI-RI hybrid lookup table method with high linearity and high-speed convergence performance, which outperforms the traditional single UI lookup table method by employing a field-programmable gate array digital I-V outer loop. The proposed method overcomes the difficulty in guaranteeing stable output characteristics of the current output-type space solar array simulator (SSAS) because of the nonlinear I-V curves and slow convergence speed to the target operating point of the latter. The new lookup method is applied to a 2.4-kW hardware power platform of SSAS, and the SSAS can quickly respond to a load step between the short-circuit and open-circuit (OC) states, which is the harshest working condition, using the UI-RI hybrid lookup table method with a shunt switching frequency of 2 kHz. It can also quickly respond to a load step between the OC and rated-load states using a series-switching frequency of 10 kHz. The experimental data-point distribution trajectory of the switching process shows a greater tendency to converge to the designed I-V curve compared with the single UI lookup table method.

• 出版日期2018-8
• 单位哈尔滨工业大学