Secondary Control for Power Sharing in a Standalone Microgrid under Unequal Feeder Impedance and Complex Loads

Ndayishimiye, Vedaste; Niringiyimana, Emile; Zhang, Xu; Olivier, Ngaboyishema; Simiyu, Patrobers; Innocent, Niyitegeka

doi:10.1109/ei2.2018.8582271

“…The control over zero-sequence currents in four-leg PV VSIs is discussed in [201], while a VU mitigation technique using three-phase damping control is suggested in [202]. A hierarchical control strategy proposed in [203], a combination of three-and four-leg VSIs in [204], switching of single-phase inverters between the three phases with the lowest phase voltage [205], and model adaptive reference control for an adaptive PI derivative controller [206] are some of the other approaches that have been proposed for VU mitigation in the network. Zhu et al [207] proposed a coordination control strategy for a hybrid energy storage system consisting of a battery and ultra-capacitor, for good performance under unbalanced and non-linear load conditions in which the battery provides the fundamental powers, while the ultra-capacitor provides the compensating power.…”

Section: Fig 4 Block Diagram Of a Typical Control Scheme For Addressmentioning

confidence: 99%

Unbalance mitigation strategies in microgrids

Vijay

¹

,

Doolla

²

,

Chandorkar

³

2020

IET Power Electronics

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Unbalance or asymmetry in the distribution network is a well-known power quality issue. In the modern active distribution system, with the increasing penetration of renewables, this phenomenon becomes more pronounced. In the context of microgrids (MGs), several works have been proposed for the management and mitigation of the unbalance, for both the sharing of unbalanced load and maintaining the voltage quality in the islanded mode and for the control of distributed generators in the grid-connected mode during unbalanced conditions. This study comprehensively reviews, summarises, and classifies the various strategies of the unbalance mitigation techniques for the islanded and grid-connected modes of operation for threephase MGs and presents the possible challenges and avenues for future investigations on the topic.

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“…However, for isolated applications, the connected loads are mostly single-phase, causing imbalances. In isolated electrical microgrids, this situation can generate power supply problems such as: 1) inappropriate power-sharing between DGs [22]; and 2) active power oscillation due to negative sequence currents. Despite this, many of the hierarchical control strategies presented in the literature have been designed to operate properly only with a balanced load.…”

Section: Introductionmentioning

confidence: 99%

Secondary Control Strategy without Communications for Unbalanced Isolated Microgrids

Salinas-Cala,

Rey-López,

Mantilla-Villalobos

2024

Rev UIS ing

0

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In the context of the energy transition, electrical microgrids have become a key energy solution for isolated zones. For this type of application, low-voltage networks with unbalanced loads are commonly connected. Despite this, many of the hierarchical control strategies presented in the literature have been designed to operate properly only in the presence of balanced loads. For this reason, it is relevant to study how control strategies can be adapted to this scenario, especially those that reduce the dependence on communications to enhance flexibility and reliability. In this sense, this paper presents a secondary layer control strategy that does not require the use of communications to operate in isolated microgrids with unbalanced loads. The strategy guarantees proper performance in terms of power-sharing between the distributed generators of the microgrid. Simulations on Matlab/Simulink are presented to validate the response of proposal.

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Secondary Control Strategy without Communications for Unbalanced Isolated Microgrids

Salinas Cala,

Rey López,

Mantilla Villalobos

2024

SICEL

0

View full text Add to dashboard Cite

In the context of the energy transition, electrical microgrids have become a key energy solution for isolated zones. For this type of application, low-voltage networks with unbalanced loads are commonly connected. Despite this, many of the hierarchical control strategies presented in the literature have been designed to operate properly only in the presence of balanced loads. For this reason, it is relevant to study how control strategies can be adapted to this scenario, especially those that reduce the dependence on communications to enhance flexibility and reliability. In this sense, this paper presents a secondary layer control strategy that does not require the use of communications to operate in isolated microgrids with unbalanced loads. The strategy guarantees proper performance in terms of power-sharing between the distributed generators of the microgrid. Simulations on Matlab/Simulink are presented to validate the response of proposal.

show abstract

Secondary Control for Power Sharing in a Standalone Microgrid under Unequal Feeder Impedance and Complex Loads

Cited by 3 publications

References 19 publications

Unbalance mitigation strategies in microgrids

Unbalance mitigation strategies in microgrids

Secondary Control Strategy without Communications for Unbalanced Isolated Microgrids

Secondary Control Strategy without Communications for Unbalanced Isolated Microgrids

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