A Nonlinear Control Strategy for DC-DC Converter with Unknown Constant Power Load Using Damping and Interconnection Injecting

Mian Wang, Fen Tang, Xuezhi Wu, Jingkai Niu, Yajing Zhang and Jiuhe Wang
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Mian Wang: National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
Fen Tang: National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
Xuezhi Wu: National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
Jingkai Niu: National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
Yajing Zhang: School of Automation, Beijing Information Science and Technology University, Beijing 100192, China
Jiuhe Wang: School of Automation, Beijing Information Science and Technology University, Beijing 100192, China

Energies, 2021, vol. 14, issue 11, 1-24

Abstract: DC-DC converters with constant power loads are mostly used in DC microgrids. Negative impedance and large disturbances of constant power loads may lead to the instability of DC-DC converters. To address this issue, a nonlinear control strategy consisting of an improved passivity-based controller and nonlinear power observer is proposed in this paper. First, an improved passivity-based controller is designed based on the port-controlled Hamiltonian with dissipation model. By proper damping and interconnection injecting, the fast dynamic response of output voltage and stability of the DC-DC converter is achieved. Second, the constant power load is observed by a nonlinear power observer, which is adopted to estimate the power variation of the constant power load within a small settling time and improve the adaptability of the DC-DC converter under power disturbance. Finally, the simulation and experimental results are presented, which illustrate the proposed control strategy not only ensures the stability of the DC-DC converter under large disturbances, but also can track the desired operating point with low voltage overshoot in no more than 10 milliseconds.

Keywords: DC-DC converter; constant power load; nonlinear control strategy; improved passivity-based controller; damping and interconnection injecting; nonlinear power observer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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