Alternative Droop Control Method using a Modified Lag Compensator for Paralleled Converters in DC Microgrids

Zammit, Daniel; Staines, Cyril Spiteri; Apap, M.; Micallef, A.

doi:10.1109/codit.2019.8820617

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…The operation of different types of DG to meet the load needs a parallel operation but causes improper load sharing between converters and circulating current due to the abrupt variations in the source, sudden changes in load, and parametric differences due to various constraints [14]. Studies in the literature have discussed the most popular techniques of load sharing such as active current sharing [15][16][17] and droop control [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. The most familiar one is the master/slave technique, where, in the master/slave current method, a common bus is employed between DC converters for proper current sharing [15] and the generation of the required base voltage.…”

Section: Introductionmentioning

confidence: 99%

“…The controller processes the demand and actual voltage values and generates the required restoration voltage. A modified lag compensator was developed and an alternative droop control method was proposed in [24], where different droop control methods such as V-I, I-V, and alternate I-V droop control were explained. The main limitation of the proposed method is the consideration of constant droop resistance.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

2021

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In a DC microgrid, droop control is the most common and widely used strategy for managing the power flow from sources to loads. Conventional droop control has some limitations such as poor voltage regulation and improper load sharing between converters during unequal source voltages, different cable resistances, and load variations. This paper addressed the limitations of conventional droop control by proposing a simple adaptive droop control technique. The proposed adaptive droop control method was designed based on mathematical calculations, adjusting the droop parameters accordingly. The primary objective of the proposed adaptive droop controller was to improve the performance of the low-voltage DC microgrid by maintaining proper load sharing, reduced circulating current, and better voltage regulation. The effectiveness of the proposed methodology was verified by conducting simulation and experimental studies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

2021

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“…The main constraint is that the whole system will get affected if there is a failure in the signal of the current bus [8]. Droop control design involves two controller loops, the first one is a voltage control loop which improves the voltage regulation and the second one is a current control loop which reduces the circulating currents in between the parallel converters [9][10][11][12]. The control loops using PI, PID and SMC have been designed to stabilize the performance of load current and output voltage.…”

Section: Introductionmentioning

confidence: 99%

“…The significance of cable resistance is discussed in [14]. An alternative droop control method using fixed droop resistance using lag compensator is discussed in [9]. Since fixed droop resistance is only permitted to fixed load, an adaptive droop control method is discussed in [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Investigation of low voltage DC microgrid using sliding mode control

Sattianadan

Kumar

Sridhar

et al. 2020

IJPEDS

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As the requirement of power increases, the use of renewable energy resources has become prominent. The power collected from these energy resources needs to be converted using AC-DC or DC-DC converters. The control of DC-DC converters is a complex task due to its non-linearity in the converter introduced by the external changes such as source voltage, cable resistance and load variations. Converters are to be designed to obtain a well stabilized output voltage and load current for variable source voltages and load changes. Droop control method is the most abundantly used technique in controlling the parallel converters. The major limitations of the conventional droop control technique are circulating current issues and improper load sharing. The proposed work is to resolve these issues by integrating Sliding Mode Controller (SMC) with the converter in order to enhance the performance of DC microgrid. The entire control system was designed by taking the output voltage error as the control variables. Similarly, droop control with PI and PID were also performed and all these techniques were simulated and compared using MATLAB/Simulink. The experimental results show that the proposed sliding mode controller technique provides good overall performance and is suitable against variable voltage and load changes.

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A Communication‐Free Master–Slave Control of Cascaded‐Type DC Microgrids With Nondispatchable Generations

Li,

Tian,

Zhou

et al. 2024

Circuit Theory & Apps

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This paper addresses the challenge of integrating dispatchable and nondispatchable distributed generators (DGs) in cascaded‐type direct current (DC) microgrids and proposes a communication‐free master–slave control strategy. In the proposed method, all DGs are treated as voltage sources. A master dispatchable DG is primarily responsible for maintaining a constant DC voltage at the point of common coupling (PCC). The rest slave nondispatchable DGs adjust their output power based on a front maximum power point tracking (MPPT) controller. This communication‐free approach enhances system reliability and ease of implementation. Moreover, it ensures load voltage stability, providing a high‐quality power supply for users. Additionally, it enables nondispatchable DGs to achieve MPPT‐based output power and enables power curtailment operation. Subsequently, a small‐signal stability analysis confirms the efficacy of the proposed strategy. Finally, simulation and experiment results further validate its efficacy.

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Alternative Droop Control Method using a Modified Lag Compensator for Paralleled Converters in DC Microgrids

Cited by 5 publications

References 12 publications

Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

Investigation of low voltage DC microgrid using sliding mode control

A Communication‐Free Master–Slave Control of Cascaded‐Type DC Microgrids With Nondispatchable Generations

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