Voltage balancing of islanded microgrids using a time-domain technique

Soto, Dionne; Edrington, Chris S.; Balathandayuthapani, Saritha; Ryster, Shawn

doi:10.1016/j.epsr.2011.11.022

Cited by 20 publications

(8 citation statements)

References 16 publications

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“…When the system is unbalanced, the negative sequence components corresponding to the symmetrical component theory proposed by Fortescue [37] is not zero. The voltage of the MG suffering high values of negative sequence component leads to increased losses and poor power quality for the connected loads [36], which can be a problem especially for all induction motors [38]. Voltage unbalance can be faced from different ways.…”

Section: Power Quality and Transientsmentioning

confidence: 99%

“…For instance in [36], the negative sequence component of the voltage is controlled at zero using a timedomain based controller. In [38], one of the DG of a MG is used as a power quality compensator for unbalances and harmonics. Through a voltage source inverter consisted of three single-phase H-bridges using IGBTs, the compensator supplies a current to PCC that balances the voltage at PCC.…”

Section: Power Quality and Transientsmentioning

confidence: 99%

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Research experimental platforms to study microgrids issues

Camblong

Curea

Etxeberria

et al. 2015

Int J Interact Des Manuf

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Microgrid (MG) concept is becoming increasingly mature. It allows integrating better distributed generation, and especially renewable energy sources, in the grid. However, many issues have still to be resolved before implementing this concept in the real power system extensively. This paper presents first a review of the main issues associated to microgrids dealt with in the scientific literature. The different issues are classified and some examples of carried out studies are given for each issue. Then, a short review of existing experimental microgrids is done. They are classified in small-size and real-size experimental MGs. After that, the EneR-GEA experimental MG or platform of ESTIA Engineering School is presented, describing its different components. Then, some carried out experiments are explained. To finish, the main planned projects at short and medium term related to this platform are given.

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Section: Power Quality and Transientsmentioning

confidence: 99%

Section: Power Quality and Transientsmentioning

confidence: 99%

Research experimental platforms to study microgrids issues

Camblong

Curea

Etxeberria

et al. 2015

Int J Interact Des Manuf

View full text Add to dashboard Cite

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“…In ( 10)- (12), if there are additional power sources connected to the PCS or ESS (Energy Storage System) is charged, it shall be added to the reference command value. Fig.…”

Section: Reactive Compensation Algorithmmentioning

confidence: 99%

“…This can cause a number of problems on the load or the grid, such as a drop in the equipment's output power and an increase in losses, due to excessive current flow to the neutral line [9]- [11]. To alleviate this problem, the 3-leg inverter employing a Δ-Y transformer [12] and zigzag transformer [13] were introduced in low-voltage distribution networks. However, there is a significant increase in weight and cost with transformers [14].…”

Section: Introductionmentioning

confidence: 99%

Imbalance Compensation of the Grid Current Using Effective and Reactive Power for Split DC-Link Capacitor 3-Leg Inverter

et al. 2021

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Unbalanced loads cause the imbalance of the grid current and the resulting imbalance of the grid voltage when the imbalance rate of the grid current increases considerably. To cope with this problem flexibly at low cost, we modify the circuit structure from previously installed Δ-Y transformer 3-phase 3leg inverter to split dc-link capacitor 3-leg inverter eliminating the transformer. And then we propose two kinds of compensation algorithms for balancing the grid current that can basically utilize a preinstalled control board. It is divided into reactive compensation, where dc-link of the inverter does not supply effective power to the grid but compensates for the imbalance of grid current, and effective compensation, where dc-link of the inverter supplies effective power to the grid for compensating the unbalanced grid current. We design an additional power calculator board to obtain power information, and apply it to a 10kW prototype, and then verify its validity through PSIM simulation and experiments.INDEX TERMS energy storage system (ESS), power conditioning system (PCS), sinusoidal pulse width modulation (SPWM), split dc-link capacitor, 3-leg inverter, 3-phase 4-wire system, unbalanced current compensation.

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“…Based on the idea that voltage imbalance compensation can be realised by controlling existing inverters, a method of taking an inverter as a negative sequence conductance is proposed to realise voltage imbalance compensation [15]. A time domain technique is adopted to extract the negative sequence voltage component, which is by injecting the negative sequence component to achieve voltage imbalance compensation [16]. The methods based on inverter control mentioned above still adopt conventional proportionalintegral (PI) control.…”

Section: Introductionmentioning

confidence: 99%