RESONANCE SUPPRESSION STRATEGY FOR DC MICROGRIDS CONSIDERING STEP-DOWN TYPE CONTROL ALGORITHMS

Zheng Feng; Wu Xudong; Zheng Zonghua; Liang Ning

doi:10.19912/j.0254-0096.tynxb.2023-1104

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (11) : 61-72. DOI: 10.19912/j.0254-0096.tynxb.2023-1104

RESONANCE SUPPRESSION STRATEGY FOR DC MICROGRIDS CONSIDERING STEP-DOWN TYPE CONTROL ALGORITHMS

Zheng Feng¹, Wu Xudong¹, Zheng Zonghua¹, Liang Ning²

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Abstract

In order to suppress microgrid resonance and bus voltage fluctuation and further improve system stability, a novel resonance suppression strategy based on fully reduced order hybrid control algorithm is proposed. The output voltage of LRC is controlled, and the current prediction model is introduced into the inner loop to improve the dynamic response speed of the system and eliminate the PWM modulator and parameter setting, so as to realize the unit of the inner loop of current. The inverse model of the controlled object is constructed in the outer loop to realize the unitization of the voltage outer loop under the control of two-degree-of-freedom. The bus voltage can completely follow the reference voltage and restrain the resonance peak in the voltage transfer function and the bus voltage fluctuation. Finally, the proposed fully reduced order hybrid control algorithm is simulated and verified on Matlab/Simulink platform. The results show that the proposed control strategy can effectively suppress the DC microgrid resonance and bus voltage fluctuation, and improve the dynamic characteristics and anti-interference ability of the microgrid.

Key words

DC microgrid / voltage control / circuit resonance / model predictive control / two-degree-of-freedom control

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Zheng Feng, Wu Xudong, Zheng Zonghua, Liang Ning. RESONANCE SUPPRESSION STRATEGY FOR DC MICROGRIDS CONSIDERING STEP-DOWN TYPE CONTROL ALGORITHMS[J]. Acta Energiae Solaris Sinica. 2024, 45(11): 61-72 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1104

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