Distributed Generation System Control Strategies in Microgrid Operation

Bai, Wenlei; Lee, Kwang Y.

doi:10.3182/20140824-6-za-1003.02116

Cited by 15 publications

(11 citation statements)

References 9 publications

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“…The PV array interfaces the grid through DC link and PWM inverter. The major role of the inverter is used for converting DC to AC power [15]. Generally the three phase inverter switching power devices consists of one, two or three arms.…”

Section: Inverter Operationmentioning

confidence: 99%

Droop Control Based Grid-Connected Solar Photovoltaic Inverters for Distributed Generation

Edward¹,

Praiselin²

2019

IJEAT

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In day to day the demand of electrical energy has been increasing in worldwide, as well the share of solar photovoltaic power generation has increased extremely because of population growth, urbanization, etc. Although the power generated from solar photovoltaic is erratically, and it makes the stability and reliability problems in a utility grid. This paper projects a P/Q droop control strategy for a grid-tied PWM inverter. This paper introduces an entire model of grid-connected solar photovoltaic array; inverter with droop control, and loads are developed for this operation. The locus points of the both power sharing of the DG system is developed by the proposed control operation. PI controllers were used in this droop control was espoused to adjust the constraints of PI controller. The results of the proposed droop control inject positive and reactive power into a variation of loads and improving the quality of power as compared to the conventional PID controllers.

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Section: Inverter Operationmentioning

confidence: 99%

Droop Control Based Grid-Connected Solar Photovoltaic Inverters for Distributed Generation

Edward¹,

Praiselin²

2019

IJEAT

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“…Microgrid capability to inject power to the grid while maintaining the system stability after getting disturbed is considered as one of the microgrid challenges [9,10]. Different control techniques such as active-reactive power control (PQ control), active power-voltage control (PV control) and voltage-frequency control (VF control) are utilized to control the DG units and achieve the required goals [11,12]. PQ scheme is used to control the exchanged real and reactive powers between the DG and grid [11].…”

Section: Introductionmentioning

confidence: 99%

“…Different control techniques such as active-reactive power control (PQ control), active power-voltage control (PV control) and voltage-frequency control (VF control) are utilized to control the DG units and achieve the required goals [11,12]. PQ scheme is used to control the exchanged real and reactive powers between the DG and grid [11]. Vf control is employed to keep the inverter voltage at constant value and return the frequency to its nominal value after getting real power disturbance [12].…”

Section: Introductionmentioning

confidence: 99%

Optimal Power Control of Inverter-Based Distributed Generations in Grid-Connected Microgrid

2019

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Distributed generation (DG) units are utilized to feed their closed loads in the autonomous microgrid. While in the grid-connected microgrid, they are integrated to support the utility by their required real and reactive powers. To achieve this goal, these integrated DGs must be controlled well. In this paper, an optimal PQ control scheme is proposed to control and share a predefined injected real and reactive powers of the inverter based DGs. The control problem is optimally designed and investigated to search for the optimal controller parameters by minimizing the error between the reference and calculated powers using particle swarm optimization (PSO). Microgrid containing inverter-based DG, PLL, coupling inductance, LC filter, power and current controllers is implemented on MATLAB. Two microgrid cases with different structure are studied and discussed. In both cases, the microgrid performance is investigated under different disturbances such as three-phase fault and step changes. The simulation results show that the proposed optimal control improves the microgrid dynamic stability. Additionally, the considered microgrids are implemented on real time digital simulator (RTDS). The experimental results verify the effectiveness and tracking capability of the proposed controllers and show close agreement with the simulation results. Finally, the comparison with the literature confirms the effectiveness of the proposed control scheme.

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“…Başka bir çalışmada, üç fazlı eviricinin kontrolünü sağlayan geleneksel aktif ve reaktif kontrolcü ve düşüm (droop) kontrolcünün performansları DÜ sistemlerinde karşılaştırılıp gerçekleştirilmiştir. Düşüm kontrolcünün daha güvenilir ve yüksek hızda cevap verdiği gözlemlenmiştir [7]. Diğer bir çalışmada ise PI ve PR kontrolcüleri için karşılaştırmalı çalışma yapılmıştır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Şebekeye bağlı yenilenebilir enerji kaynaklı eviriciler için yeni bir akım kontrol stratejisi

Meral¹,

Çelík²

2019

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Highlights:Graphical/Tabular Abstract  The proposed fast and robust PNS extractor for reference current generation  The improving dynamic performances of grid connected RESI by use of PCI controller  The providing controllability of activereactive power oscillationsUnbalanced grid voltages include positive and negative sequence (PNS) components. In particular, the negative sequence components that cause oscillations on the control signals, significantly affect the performance of the grid-connected renewable energy source inverters (RESI). In this study, proportional complex integrator (PCI) based current controller is proposed to deal with the disadvantages such as slow dynamic response, steady-state errors and complex structure of the proportional integral (PI) based dual current controller used for the control of grid connected RESI under non-ideal grid voltage conditions. The reference currents based on the active-reactive power reference signals, PNS components and the flexible control parameter are generated for use in control loops. The relationship between the active-reactive power oscillations, which are caused by non-ideal grid conditions, are comprehensively analysed and controlled with a flexible control parameter. An important contribution to similar previous studies is that the PNS voltagecurrent components required for the reference current generation are separated by the proposed fast and robust dual average filter based phase locked loop (DAPLL). The performance of the proposed PCI-based current control strategy is compared and tested with the PI-based dual current control strategy using various case studies. Results:The performance of the proposed PNS extractor, the PI-based dual-current controller and the PCI-based current controller for the control of the grid-dependent inverter has been tested and verified under various scenarios such as phase to phase grid faults, grid voltage harmonics and variation of flexible control parameter. The effectiveness and availability of proposed test system is verified by using PSCAD/EMTDC software. The proposed system is shown in Figure A. Conclusion:One of the important contributions of this study is the PNS voltage and current components required for use in the reference current generation with a novel PNS extractor, which is fast, robust and not affected by harmonic components. The results show that the proposed PCI-based current control strategy improves the dynamic response and stability of grid-connected RESI, minimizing current errors and harmonic components.

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Distributed Generation System Control Strategies in Microgrid Operation

Cited by 15 publications

References 9 publications

Droop Control Based Grid-Connected Solar Photovoltaic Inverters for Distributed Generation

Droop Control Based Grid-Connected Solar Photovoltaic Inverters for Distributed Generation

Optimal Power Control of Inverter-Based Distributed Generations in Grid-Connected Microgrid

Şebekeye bağlı yenilenebilir enerji kaynaklı eviriciler için yeni bir akım kontrol stratejisi

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