Research on power coordinated control strategy of wind turbine-based DC microgrid under various modes

Yuan, Fang; Zhang, Ziguang; Wáng, Yì; Yu, Ming; Hei, Yang; Meng, Jianhui; Hui, Wang

doi:10.1109/ipemc.2016.7512510

Cited by 5 publications

(8 citation statements)

References 5 publications

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“…12a. When the load current is increased to mi op−m , each current of the m converters will be i op−m , then according to (26) and (27), the following can be obtained: Thus, from (27), it can be found that the m converters' compensate value for voltage reference is changed to the initial compensate value of priority (m + 1) converter According to (26), the current will be shared by the (m + 1) converters as shown in Fig. 12a, and…”

Section: Resultsmentioning

confidence: 99%

“…12b. When the load current is decreased to (m − 1)i op−(m−1) , each current of the m converters will be (m − 1)i op−(m−1)/m , then according to (26) and (27), the following can be obtained:…”

Section: Resultsmentioning

confidence: 99%

“…Agents in Ψ 1 have higher priorities than Ψ 0 to share the load, and the agents in the same set prioritise current sharing according to their initial priorities. Thus, (26) and (27) can be rewritten as…”

Section: Soc Managementmentioning

confidence: 99%

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Distributed secondary and tertiary controls for I–V droop‐controlled‐paralleled DC–DC converters

Wang

Han

Guerrero

et al. 2018

IET Generation, Transmission & Distribution

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A hierarchical distributed control method for I-V droop-controlled-paralleled DC-DC converters in DC microgrid is proposed. The control structure includes primary, secondary, and tertiary levels. The secondary control level is used to remove the DC voltage deviation and improve the current sharing accuracy. An improved dynamic consensus algorithm is used in the secondary control to calculate the average values of bus voltage and voltage restoration in distributed control. In the tertiary control level, as the main contribution in this study, the system conversion efficiency is enhanced by using the average restoration value obtained in the secondary control level, instead of using the total load current which needs more communication traffic. When the converters are connected to batteries, the method for the state of charge (SoC) management is proposed so that the SoC balance can be guaranteed. The effectiveness of the proposed method is verified by detailed experimental tests based on four 0.7 kW DC-DC converters.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Distributed secondary and tertiary controls for I–V droop‐controlled‐paralleled DC–DC converters

Wang

Han

Guerrero

et al. 2018

IET Generation, Transmission & Distribution

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“…As the absolute error is less than e 1k , Δk pk returns to zero to eliminate the error rapidly and guarantee good stead-state performance. According to (3), the relationship between the n converters' threshold values can be obtained as 11…”

Section: Small Proportional Termmentioning

confidence: 99%

“…In the aforementioned applications, the droop control is often used by imposing virtual resistance in order to achieve autonomous (communication-less) current sharing among paralleled converters [9]- [11]. When using droop control methods, also named primary control, the major concern of previous works are focused on the secondary and tertiary control levels inside the hierarchical control structure according to voltage deviations caused by line impedance [12]- [16], state of charge (SoC) for battery management systems [17]- [19], power losses [19]- [22], and communication algorithms [16], [22]- [23].…”

Section: Introductionmentioning

confidence: 99%

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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Research on the operation control strategy for the DC micro-grid based on the DCT equivalent model

2017

2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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Research on power coordinated control strategy of wind turbine-based DC microgrid under various modes

Cited by 5 publications

References 5 publications

Distributed secondary and tertiary controls for I–V droop‐controlled‐paralleled DC–DC converters

Distributed secondary and tertiary controls for I–V droop‐controlled‐paralleled DC–DC converters

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

Research on the operation control strategy for the DC micro-grid based on the DCT equivalent model

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