Decentralised voltage balancing in bipolar dc microgrids equipped with trans‐z‐source interlinking converter

Tavakoli, Saman Dadjo; Khajesalehi, Jasem; Hamzeh, Mohsen; Sheshyekani, Keyhan

doi:10.1049/iet-rpg.2015.0222

Cited by 36 publications

(30 citation statements)

References 21 publications

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“…To overcome the limitations of conventional inverters, a new topology called the Z-source inverter (ZSI) [2] was introduced. In recent times, many researchers have shown improvements in the ZSIs in different ways which includes new topologies, control strategies, modelling and applications [3][4][5][6][7][8][9][10][11][12][13][14]. The forbidden shoot-through state in the conventional VSI decides the required boost gain of the ZSI.…”

Section: Introductionmentioning

confidence: 99%

Single‐phase high‐voltage gain switched LC Z‐source inverters

Bussa¹,

Ahmad²,

Singh³

et al. 2018

IET Power Electronics

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Recently, switched-inductor Z-source inverters (SL-ZSIs) have been reported to achieve high-voltage gain and good power inversion operation at low shoot-through duty ratio D as compared to conventional ZSI. As the SL-ZSIs have high passive component count, weight, volume and losses of the system increases that lead to reduction in efficiency. To address the issues of conventional ZSI and SL-ZSIs, two single-phase switched LC (SLC)-ZSIs (Type 1 SLC-ZSI and Type 2 SLC-ZSI) are proposed in this study to achieve high-voltage gains at low values of D with lower passive component count as compared to SL-ZSIs. At low values of D, modulation index M approaches to higher values which results into improved AC output at reduced harmonic distortion. Due to low passive component count in the proposed inverters, weight, volume and losses decreases resulting into increase in efficiency. The proposed inverters can be used in various DC-AC and DC-DC power conversions in renewable energy applications due to their high-voltage gain, better immunity to EMI noise and higher reliability. The detailed steady-state analysis of the two proposed SLC-ZSIs is given in this study. Scaled down experimentation has been carried out to verify the performance of the proposed inverters.

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Section: Introductionmentioning

confidence: 99%

Single‐phase high‐voltage gain switched LC Z‐source inverters

Bussa¹,

Ahmad²,

Singh³

et al. 2018

IET Power Electronics

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“…More detailed information regarding consensus and dynamic consensus has been discussed later in this study. However, complex mathematical analysis and communication delay are the major problems of the distributed control system especially in the nonideal environment [7,[17][18][19].…”

Section: Hierarchical Control Strategies For Microgrid Systemmentioning

confidence: 99%

“…for primary control level, centralised, decentralised, distributed control for secondary level and genetic algorithm (GA), particle swarm algorithm, consensus algorithm etc. for tertiary control [4,[15][16][17][18][19]. Out of these numerous control schemes, each one has its own set of advantages and disadvantages which makes a difficult choice for any control designer to select a particular control strategy without sacrificing the desired goals of the system.…”

Section: Introductionmentioning

confidence: 99%

Review of hierarchical control strategies for DC microgrid

Abhishek

Ranjan

Devassy

et al. 2020

IET Renewable Power Generation

129

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This work presents an extensive review of hierarchical control strategies that provide effective and robust control for a DC microgrid. DC microgrid is an efficient, scalable and reliable solution for electrification in remote areas and needs a reliable control scheme such as hierarchical control. The hierarchical control strategy is divided into three layers namely primary, secondary and tertiary based on their functionality. In this study, different methods of primary control for current and voltage regulation, secondary control for error-correction in voltage and current, power sharing in a microgrid and microgrid clusters and tertiary control for power and energy management with a primary focus on minimal power loss and operational cost in a DC microgrid system are reviewed in-depth. Along with this, the advantages and limitations of various control structures like centralised, decentralised, distributed are discussed in this study. After a comparative study of all control strategies, the optimum control schemes from the author's point of view are also presented.

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“…To this aim, we use a bipolar dc/dc boost converter topology which provides the possibility of performing the voltage balancing in a decentralized fashion. Although a decentralised voltage-balancing scheme has been proposed in [11], the main focus was given to the control system of z-source converter. In this paper, small-signal analysis is done to obtain the transfer functions.…”

Section: Introductionmentioning

confidence: 99%

Decentralized Voltage Balancing and Power Sharing in Islanded Bipolar DC Microgrids

Tavakoli¹

2020

Preprint

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<div>This paper presents a decentralized control scheme for voltage balancing and power sharing in bipolar dc</div><div>microgrids. This relies on utilizing a converter topology which offers three levels of output voltage availability with the key features of boosting the input voltage and balancing the output voltages. This converter makes it possible to further improve the structure of bipolar dc microgrids as it does not require a central voltage balancer. Small-signal analysis is done and system transfer functions are derived. Based on the RGA concept the highly coupled input-output pairs are found which helps with replacing the MIMO control system of the converter by two SISO systems. The appropriate voltage and current controllers are designed based on SISO principles. Moreover, a double droop control method is proposed which fulfills the simultaneous power sharing and voltage regulation of DG units in the host microgrid. The effectiveness of the proposed control strategy is demonstrated through simulation studies conducted on an</div><div>islanded bipolar dc microgrid involving unbalanced loads, while the voltage balancing of the bipolar dc microgrid and the power sharing accuracy are evaluated.</div>

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Decentralised voltage balancing in bipolar dc microgrids equipped with trans‐z‐source interlinking converter

Cited by 36 publications

References 21 publications

Single‐phase high‐voltage gain switched LC Z‐source inverters

Single‐phase high‐voltage gain switched LC Z‐source inverters

Review of hierarchical control strategies for DC microgrid

Decentralized Voltage Balancing and Power Sharing in Islanded Bipolar DC Microgrids

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