Sharing Transient Loads : Causes of Unequal Transient Load Sharing in Islanded Microgrid Operation

Paquette, Andrew D.; Reno, Matthew J.; Harley, R.G.; Divan, Deepak

doi:10.1109/mias.2013.2288408

Cited by 115 publications

(58 citation statements)

References 19 publications

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“…Single-loop control is also used, most notably by CERTS [10,11], which at present is arguably the most advanced microgrid development program in the United States. This paper is follow-on research to [6], which used single-loop control, and therefore both single-loop and multi-loop controls are investigated in this paper. One favorable property of single-loop control for microgrids is the reduced sensitivity to impedance-related stability, as will be observed in the small-signal analysis of Section IV.B.…”

Section: A Single-loop and Multi-loop Inverter Controlmentioning

confidence: 99%

“…This is because of the inverter and generator's different frequency regulation characteristics [6]. The control diagram for a synchronous generator operating with voltage and frequency droop is shown in Fig.…”

Section: A Transient Power Sharing Characteristics Between Invertersmentioning

confidence: 99%

“…Grid-supporting-grid-forming inverters and synchronous generators in islanded microgrids exhibit poor transient load sharing where the inverter initially picks up the majority of any load step [6][7][8]. This poor transient load sharing constrains the inverter rating relative to the largest load step, increases strain on the inverter, and negatively impacts battery life in battery energy storage inverters.…”

Section: Introductionmentioning

confidence: 99%

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Transient droop for improved transient load sharing in microgrids

Paquette

Divan

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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Inverters and synchronous generators in islanded microgrids exhibit poor transient load sharing where the inverter initially picks up the majority of any load step. Transient voltage and frequency droop are proposed to allow the inverter voltage and frequency to dip more during transients to improve the transient load sharing, reduce peak inverter power requirements, and allow the microgrid designer more control over the transient load sharing characteristics. The impact of the transient droop terms on system stability is evaluated using small-signal analysis, and validation of the proposed method is provided by simulation and experimental results.

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Section: A Single-loop and Multi-loop Inverter Controlmentioning

confidence: 99%

Section: A Transient Power Sharing Characteristics Between Invertersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transient droop for improved transient load sharing in microgrids

Paquette

Divan

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…The converter output is monitored to achieve the targets only through receiving feedback from current output disregarding the voltage range. In order to achieve more accurate and practical results, it is suggested to measure the output voltage and current of converters [15,16]. Given the optimal allocation of power between DG units, the controlling effect on the circulating currents among resources is necessary to reduce power losses.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Energy Management of Hybrid DC Renewable Grid Using Decentralized Control Strategies

2016

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This paper attempted to control a hybrid DC microgrid in islanded operation mode using decentralized power management strategies. Proposed adaptive I/V characteristic for hybrid photovoltaic (PV) and battery energy storage system (BESS) and wind turbine generator (WTG) adapts the distributed energy resources (DER) behavior independently in accordance with the load demand. Hence, the PV module can spend its maximum power on load demand and spend the extra power for charging the BESS, which will regulate DC bus voltage and maintain the power balance within the microgrid. When load demand is beyond the maximum generation power of PV unit, WTG will supply the energy shortage. The proposed control system was applied on the DC microgrid in order to achieve control objectives through a decentralized procedure, without telecommunication links. In order to validate the proposed strategies, the control system was implemented on a DC microgrid within MATLAB/SIMULINK, where the simulation results were analyzed and validated.

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“…An investigation was carried out in [8] to fmd the cause for poor transient load sharing in an islanded microgrid. In [9] and [10], a modified droop control technique and virtual impedance was proposed to limit the inverter' s current during overloads.…”

mentioning

confidence: 99%

Evaluation of control methods to prevent prime-mover stalling in a mixed source microgrid

Pulcherio

Renjit

Illindala

et al. 2016

2016 IEEE/IAS 52nd Industrial and Commercial Power Systems Technical Conference (I&CPS)

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For a microgrid with a mix of distributed energy resources (DERs), major challenges on its survivability are found in the islanded condition. In particular, a sudden loss of generation or a large and fluctuating load could force the microgrid to operate near its capacity limits. Such a situation can cause a cascading collapse of the system, even when the load demand is within the DER's kW rating -as observed during several tests at the Consortium for Electric Reliability Technology Solutions (CERTS) Microgrid Test Bed. This paper analyzes the prime-mover stalling phenomena behind the system collapse. It highlights how the reserve margin of the system is lowered during transient conditions. Furthermore, two control methods are evaluated to resolve the microgrid collapse problem.

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Sharing Transient Loads : Causes of Unequal Transient Load Sharing in Islanded Microgrid Operation

Cited by 115 publications

References 19 publications

Transient droop for improved transient load sharing in microgrids

Transient droop for improved transient load sharing in microgrids

Cooperative Energy Management of Hybrid DC Renewable Grid Using Decentralized Control Strategies

Evaluation of control methods to prevent prime-mover stalling in a mixed source microgrid

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