Stability Improvement of Cascaded Power Conversion Systems Based on Hamiltonian Energy Control Theory

Authors

Shengzhao Pang, Babak Nahid-Mobarakeh, Saeid Aghaei Hashjin, Serge Pierfederici, Jean-Philippe Martin, Yuntian Liu, Yigeng Huangfu, Guangzhao Luo, Fei Gao

Abstract

It is well known that the interaction between cascaded individually designed power conversion systems can cause instability. To overcome this issue, a Hamiltonian energy control scheme is proposed, which is based on passivity control theory and port-controlled Hamiltonian framework. A complementary PI adjustment term is also included in the control algorithm to eliminate the steady-state output voltage error caused by the parameter uncertainty. The proposed control approach is applied to three different cascade structures. First, the cascade structure between dc/dc converters is considered, and the detailed controller design is given. Second, the cascade connection of a single converter and its LC filter is studied. By placing the LC filter into the Hamiltonian model of the controlled converter system, the dynamic and potential instability caused by the filter can be adjusted. Finally, the cascade structure between subsystems including filters and converters, which are common in microgrids, is studied. By using the Hamiltonian function (storage function) as the Lyapunov function candidate, the large-signal stability of each controlled converter system is proved. When the cascade structure contains multiple controlled converter systems, the stability of the entire cascaded system is guaranteed by the superposition of multiple Lyapunov functions. A 3.5 kW 220−270−350 V test bench is built in the laboratory to demonstrate the application of the proposed control approach to these three cascade structures.

Citation

• Journal: IEEE Transactions on Industry Applications
• Year: 2021
• Volume: 57
• Issue: 1
• Pages: 1081–1093
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• DOI: 10.1109/tia.2020.3038355

BibTeX

@article{Pang_2021,
  title={{Stability Improvement of Cascaded Power Conversion Systems Based on Hamiltonian Energy Control Theory}},
  volume={57},
  ISSN={1939-9367},
  DOI={10.1109/tia.2020.3038355},
  number={1},
  journal={IEEE Transactions on Industry Applications},
  publisher={Institute of Electrical and Electronics Engineers (IEEE)},
  author={Pang, Shengzhao and Nahid-Mobarakeh, Babak and Hashjin, Saeid Aghaei and Pierfederici, Serge and Martin, Jean-Philippe and Liu, Yuntian and Huangfu, Yigeng and Luo, Guangzhao and Gao, Fei},
  year={2021},
  pages={1081--1093}
}

Download the bib file

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