A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid

Wang, Haojie; Han, Minxiao; Yan, Wei; Zhao, Guopeng; Guerrero, Josep M.

doi:10.3390/en9070529

Cited by 5 publications

(3 citation statements)

References 18 publications

(22 reference statements)

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“…Content may change prior to final publication. Citation information: DOI 10.1109/TPEL.2017.2714342, IEEE Transactions on Power Electronics fluctuating inductor currents against the steady-state characteristics [27]. Therefore, an adaptive PI controller with a compensator is proposed to improve the dynamic response of I-V droop control and guarantee good steady-state performance simultaneously.…”

Section: B the Proposed Adaptive Pi Controlmentioning

confidence: 99%

“…In order to guarantee the proportional term constant in steady-state, this threshold value e 1k should satisfy the following condition as . (27) In order to prevent the frequent switching of the proportional term, the hysteresis loop needs to be used as shown in Fig. 11, so the follows can be obtained (28) where Δk pk means the variation of proportional term of the k-th converter, and Δk pk needs to be increased to k pok to improve the response speed when the absolute error increases to e 2k .…”

Section: Small Proportional Termmentioning

confidence: 99%

“…On the other hand, the dynamic characteristics of a current-fed converter developed from the corresponding voltage-fed converter by applying the duality-transformation method are investigated in [26], which is based on the photovoltaic generator. In [27], a feed-forward control based on dual-loop constant voltage PI control for three-phase interleaved dc-dc converter in dc MG is proposed, which is used to increase the output current reference of the converter T 0885-8993 (c) 2016 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.…”

Section: Introductionmentioning

confidence: 99%

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A Decentralized Current-Sharing Controller Endows Fast Transient Response to Parallel DC–DC Converters

Wang

Han

et al. 2018

IEEE Trans. Power Electron.

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This paper proposes a decentralized currentsharing control strategy to endow fast transient response to paralleled DC-DC converters systems, such as DC microgrids or distributed power systems. The proposed controller consist of two main control loops: an external voltage droop control for current-sharing proposes and an internal current loop. The external droop control loop is designed as a voltage loop with embedded virtual impedance, which avoids the use of a slow voltage loop and a separate extra virtual impedance loop that may limit the system bandwidth. The internal current loop, thanks to the external control loop simplification, plays a major role in the system bandwidth, so that an adaptive PI controller is proposed for this matter. In the paper, two different droop control methods have been modeling, designed, simulated, and tested: the conventional virtual-impedance-loop based V-I droop and the proposed embedded-virtual-impedance based I-V droop. In order to compare the dynamic response performances between two droop controllers, their state-space models have been developed and analyzed in this paper. The results show that the dynamic response of the I-V droop control is faster than that of the conventional V-I droop control. Furthermore, by analyzing the effects from I-V droop control parameters, the errors can be reduced faster by enlarging the proportional terms, but with no fluctuations, and then completely eliminated by restoring back to small proportional values. Meanwhile, there exists a trade-off phenomenon between the fast dynamic response and good  steady-state performance, thus an adaptive PI controller is proposed to both improve dynamic response and guarantee good steady-state performance simultaneously. Experimental results are shown to verify the accuracy of the models and the effectiveness of the proposed control framework.

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Section: B the Proposed Adaptive Pi Controlmentioning

confidence: 99%

Section: Small Proportional Termmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Decentralized Current-Sharing Controller Endows Fast Transient Response to Parallel DC–DC Converters

Wang

Han

et al. 2018

IEEE Trans. Power Electron.

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Adaptive droop control for enhanced stability and robustness in DC microgrids

Shekhar,

Alam

2024

Computers and Electrical Engineering

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A current reference-enhanced strategy endows the GFC in DC microgrids better dynamic response

Xie,

Zheng,

Shi

et al. 2024

Sci Rep

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The constant voltage strategy (CVS) is more suitable for the small-capacity dc microgrid applications to form the dc bus voltage because it can eliminate the steady voltage deviation. However, its dynamic performance is slowed down by the integrator in the voltage loop and negatively influenced by the load steps. Some advanced methods have been conducted in the literature. However, their principle is to increase the system bandwidth, which is limited because the bandwidth is generally designed about one-tenth of the switching frequency and cannot be increased infinitely. This work pays efforts to increase the gain within the system bandwidth to accelerate the transient response and simultaneously eliminate the influence of the integrator. Therefore, the non-integrator disturbance observer-based (NIDOB) strategy is proposed in this work, and it can feed the load current into the current reference to replace the output of the integrator. Compared to the traditional and non-integrator directly-feedforward (NIDF) strategy, it has a better dynamic performance. Compared to the bandwidth-increased strategy, it does not introduce more noise. The theoretical analysis and experimental results prove its advantages.

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A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid

Cited by 5 publications

References 18 publications

A Decentralized Current-Sharing Controller Endows Fast Transient Response to Parallel DC–DC Converters

A Decentralized Current-Sharing Controller Endows Fast Transient Response to Parallel DC–DC Converters

Adaptive droop control for enhanced stability and robustness in DC microgrids

A current reference-enhanced strategy endows the GFC in DC microgrids better dynamic response

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