Transient Modeling Method for Faulty DC Microgrid Considering Control Effect of DC/AC and DC/DC Converters

Kong, Liang; Nian, Heng

doi:10.1109/access.2020.3017015

Cited by 28 publications

(11 citation statements)

References 29 publications

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“…In future work, the hardware-in-the-loop will be conducted to perform real-time simulation of the power system [47][48][49]. The platform used to execute the proposed framework is OPAL-RT OP5600 equipped in UNSW RTS lab.…”

Section: Discussionmentioning

confidence: 99%

Differential Evolution-Based Overcurrent Protection for DC Microgrids

Zhang

et al. 2021

Energies

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DC microgrids have advantages over AC microgrids in terms of system efficiency, cost, and system size. However, a well-designed overcurrent protection approach for DC microgrids remains a challenge. Recognizing this, this paper presents a novel differential evolution (DE) based protection framework for DC microgrids. First, a simplified DC microgrid model is adopted to provide the analytical basis of the DE algorithm. The simplified model does not sacrifice performance criterion in steady-state simulation, which is verified through extensive simulation studies. A DE-based novel overcurrent protection scheme is then proposed to protect the DC microgrid. This DE method provides an innovative way to calculate the maximum line current, which can be used for the overcurrent protection threshold setting and the relay coordination time setting. The detailed load condition and solar irradiance for each bus can be obtained by proposed DE-based method. Finally, extensive case studies involving faults at different locations are performed to validate the proposed strategy’s effectiveness. The expandability of the proposed DE-based overcurrent protection framework has been confirmed by further case studies in seven bus mesh systems.

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Section: Discussionmentioning

confidence: 99%

Differential Evolution-Based Overcurrent Protection for DC Microgrids

Zhang

et al. 2021

Energies

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“…Pachanapan [48] presented a dynamic model of the grid-tied inverters used in battery and PV systems. Kong and Nian [49] proposed a transient modelling method for DC microgrids that considered the control effects of different DC/AC and DC/DC converters; their results showed that the proposed method can not only improve the accuracy of transient analysis of the DC microgrids, but can also enhance the calculation efficiency. To mitigate the effects of multiple uncertainties and realize economical operation of an AC/DC hybrid microgrid, a temporally coordinated energy management strategy was proposed for the AC/DC hybrid microgrid which considered the dynamic conversion efficiency of the bidirectional AC/DC converter in [50].…”

Section: State-of-the-artmentioning

confidence: 99%

The Design and Application of Microgrid Supervisory System for Commercial Buildings Considering Dynamic Converter Efficiency

et al. 2023

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This paper presents a supervisory system that considers converter efficiency for local microgrids of commercial buildings to solve the uncertainty problem of the sources and loads while also optimizing local microgrid operating costs and maintaining power supply quality for commercial buildings. The supervisory system includes an energy management layer and a power management layer. In the energy management layer, a long-term optimization approach is used to reduce the operating costs by considering the dynamic converter efficiency. In the power management layer, a real-time power optimization method is structured to deal with the uncertainty problem of the sources and loads, and to ensure that the direct current bus power is balanced while also guaranteeing the power quality by considering the dynamic converter efficiency. Four cases are proposed for the supervisory system, and these cases are simulated in MATLAB/Simulink under three typical weather conditions: cloud, sunshine, and rain. The comparison of simulation results for cases 1 and 2 illustrates the impact of converter efficiency on energy coordination in microgrids. The simulation results of cases 3 and 4 verify that the performance—in terms of the power supply quality and the operating costs—of the proposed microgrid supervisory system considering dynamic converter efficiency outperforms that of the microgrid supervisory system considering fixed converter efficiency.

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“…Figure 14 shows the ES block diagram to implement the model of Equation (29). The scheme presented in Figure 14 shows the PI controller of the PLL of Figure 7; however, similar diagrams were used for the inner loop and outer loop controllers of the control structure.…”

Section: Controllermentioning

confidence: 99%

“…For the design and implementation of HILPs to emulate DC µGs, various DBs have been used. In [29], the Typhoon 602+ platform was used to emulate the behavior of a DC µG with an IT of 1 µs, while for the TMS32028335DSPC, Spartan 6XC6SLX16FPGA DBs were used to control the different converters, which operate with a modulation frequency of 10 kHz. These implementations were carried out to analyze the effect of the drivers on the transitions of the DC µG converters.…”

Section: Introductionmentioning

confidence: 99%

Power Sharing Control in a Grid-Tied DC Microgrid: Controller Hardware in the Loop Validation

et al. 2021

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This article presents the development of a low-cost control hardware in the loop platform for the validation and analysis of controllers used for the management of power sharing between the main grid and a DC microgrid. The platform is made up of two parts: a main grid interconnection system emulator (MGISE) and a controller under test (CUT). The MGISE operates on a 260 V DC bus and includes a 1000 W photovoltaic array, a DC variable load and a single H full bridge converter (HFBC). The CUT includes a phase locked loop and a main cascade control structure composed of two PI controllers. Both the MGISE and the CUT were embedded on an NI myRIO-1900 development board and programmed using LabVIEW virtual instrumentation software. These devices communicate with each other using analog signals representing the AC side current, the DC side voltage, and the HFBC control signal. The MGISE operates with an integration time of 6 µs and its performance is validated by comparing it with a simulation in PSIM. The integration time of the MGISE, the development boards used, as well as its programming environment, and the results obtained from the comparison with PSIM simulation, show that the proposed platform is useful for the validation of controllers for power sharing, with a simple implementation process compared to other hardware description methods and with a low-cost platform.

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Transient Modeling Method for Faulty DC Microgrid Considering Control Effect of DC/AC and DC/DC Converters

Cited by 28 publications

References 29 publications

Differential Evolution-Based Overcurrent Protection for DC Microgrids

Differential Evolution-Based Overcurrent Protection for DC Microgrids

The Design and Application of Microgrid Supervisory System for Commercial Buildings Considering Dynamic Converter Efficiency

Power Sharing Control in a Grid-Tied DC Microgrid: Controller Hardware in the Loop Validation

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