A Novel, Stable, and Economic Power Sharing Scheme for an Autonomous Microgrid in the  Energy Internet

Yan, Bin; Wang, Bo; Zhu, Lin; Liu, Hesen; Li, Fangxing; Ji, Xingpei; Liu, Dichen

doi:10.3390/en81112338

Cited by 30 publications

(22 citation statements)

References 28 publications

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“…Compared with AC microgrid systems, the voltage source converter (VSC)-based DC microgrids show many advantages, including a high power-converting efficiency, greater power capacity, better power quality, and thus a lower discarding rate of distributed energies [1,2]. The converters in a microgrid allow the power flow to be bidirectional, catering for the flexible locations of loads and renewable energy.…”

Section: Introductionmentioning

confidence: 99%

Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines

et al. 2018

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Abstract:With the promotion of distributed energy and direct current (DC) loads, the DC microgrid is able to provide a higher power quality and improve the grid efficiency. Various technical issues in DC microgrids are still to be addressed, particularly a proper protection scheme for fault detection and isolation in DC microgrids utilizing voltage source converters (VSCs). In this paper, the pole-to-pole DC fault transient behavior of the VSC-based microgrids is firstly analyzed with four successive stages, and then the exact requirements for protections are presented. Furthermore, a novel single-ended protection scheme based on local transient signals is proposed, which needs no data transmission or synchronization between two ends, ensuring the speed. A four-terminal DC microgrid model was built in PSCAD/EMTDC. Numerous simulations have demonstrated the validity of the proposed scheme.

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Section: Introductionmentioning

confidence: 99%

Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines

et al. 2018

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“…Microgrid is a new concept for integrating renewable distributed resources (DGs) in distribution energy system [1,2]. Unlike the conventional power system, microgrid always consists of various renewable DGs, such as, photovoltaic (PV) and wind turbine.…”

Section: Introductionmentioning

confidence: 99%

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

et al. 2016

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Abstract:In low-voltage converter-based alternating current (AC) microgrids with resistive distribution lines, the P-V droop with Q-f boost (VPD/FQB) is the most common method for load sharing. However, it cannot achieve the active power sharing proportionally. To overcome this drawback, the conventional P-ω/Q-V droop control is adopted in the low-voltage AC microgrid. As a result, the active power sharing among the distributed generators (DGs) is easily obtained without communication. More importantly, this study clears up the previous misunderstanding that conventional P-ω/Q-V droop control is only applicable to microgrids with highly inductive lines, and lays a foundation for the application of conventional droop control under different line impedances. Moreover, in order to guarantee the accurate reactive power sharing, a guide for designing Q-V droop gains is given, and virtual resistance is adopted to shape the desired output impedance. Finally, the effects of power sharing and transient response are verified through simulations and experiments in converter-based AC Microgrid.

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“…Recently, distributed generation (DG) has attracted more attention due to the perceived advantages of easy integration of resources, high energy utilization efficiency, flexible installation location, and low power transmission losses [1,2]. Therefore, DG penetration in the main grid has gradually increased, and may potentially be a future trend in electric power system development [3].…”

Section: Introductionmentioning

confidence: 99%

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

et al. 2016

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Abstract:The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power management in a decentralized manner. This control scheme contains three different droop strategies according to characteristics of PV and ES. First, the modified droop control is proposed for PV, which can take full utilization of renewable energy and avoid regulating output active power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel droop control incorporating a constant power band is presented for DC-side ES. Third, a cascade droop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged. Moreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid. The power control of IC is enabled when the AC-or DC-side suffer from active power demand shortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts as a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is verified by simulations.

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A Novel, Stable, and Economic Power Sharing Scheme for an Autonomous Microgrid in the Energy Internet

Cited by 30 publications

References 28 publications

Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines

Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

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