Benefits of power electronic interfaces for distributed energy systems

Kroposki, Benjamin; Pink, C.; DeBlasio, R.; Thomas, H.; Simões, Marcelo Godoy; Sen, P.K.

doi:10.1109/pes.2006.1709502

Cited by 89 publications

(49 citation statements)

References 16 publications

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“…A useful feature of a power electronic interface is the ability to reduce or eliminate fault current contributions from distributed energy system, thereby allowing negligible impacts on protection coordination. Finally, power electronic interfaces provide flexibility in operations with various other DERs, and can potentially reduce overall interconnection costs through standardization and modularity [91]. This issue is discussed in [92] in which a power-electronic interface, including an ESS module and an inverter for coupling DERs within a microgrid is introduced.…”

Section: Application Of Power Electronics In Microgridsmentioning

confidence: 99%

State of the Art in Research on Microgrids: A Review

et al. 2015

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The significant benefits associated with microgrids have led to vast efforts to expand their penetration in electric power systems. Although their deployment is rapidly growing, there are still many challenges to efficiently design, control, and operate microgrids when connected to the grid and also when in islanded mode, where extensive research activities are underway to tackle these issues. It is necessary to have an across-the-board view of the microgrid integration in power systems. This paper presents a review of issues concerning microgrids and provides an account of research in areas related to microgrids, including distributed generation, microgrid value propositions, applications of power electronics, economic issues, microgrid operation and control, microgrid clusters, and protection and communications issues.

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Section: Application Of Power Electronics In Microgridsmentioning

confidence: 99%

State of the Art in Research on Microgrids: A Review

et al. 2015

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“…After the fault occurs, the arm inductors suffer a high fault short-circuit voltage, as depicted by (6), which causes a rapid increase of fault currents. Thus, the active dc component control of fault current is required to have a fast response and the ability to predict the future error of the system response.…”

Section: Active Fault Current Control Strategymentioning

confidence: 99%

“…The dc circuit breakers (DCCBs), including mechanical DCCBs, solid-state DCCBs, and hybrid DCCBs, have the potential to isolate a dc fault and protect stations from damage. However, the response of conventional mechanical DCCBs is slow and converter semiconductors endure high current stress during the response time [5][6][7]. The solid-state DCCBs can rapidly isolate a fault but at high capital cost and significant on-state losses.…”

Section: Introductionmentioning

confidence: 99%

Active control of DC fault currents in DC solid-state transformers during ride-through operation of multi-terminal HVDC systems

Yao

et al. 2017

2017 IEEE Power &Amp; Energy Society General Meeting

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When a pole-to-pole dc fault occurs in a multiterminal HVDC system, it is desirable that the stations and dc solid-state transformers on healthy cables continue contributing to power transfer, rather than blocking. To reduce the fault current of a modular multilevel converter based dc solid-state transformer, active fault current control is proposed, where the dc and ac components of fault arm currents are regulated independently. By dynamically regulating the dc offset of the arm voltage rather than being set at half the rated dc voltage, the dc component in the fault current is reduced significantly. Additionally, reduced ac voltage operation of the dc solid-state transformer during the fault is proposed, where the ac voltage of transformer is actively limited in the controllable range of both converters in the transformer to effectively suppress the ac component of the fault current. The fault arm current peak and the energy absorbed by the surge arrester in the dc circuit breakers are reduced by 31.8% and 4.9% respectively, thereby lowering the capacities of switching devices and circuit breakers. Alternatively, with the same fault current level, the dc-link node inductance can be halved by using the proposed control, yielding lowered cost and volume. The novel active fault current control mechanism and the necessary control strategy are presented and simulation results confirm its feasibility.

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“…As a result of the growing concerns about distributed generation, the paradigms of microgrids and smart grids have emerged and gained attention over the last years [10] [11] [12], in which power electronics undergoes an essential involvement [13]. Concerning microgrids, these can operate either in islanded mode or in grid-connected mode.…”

Section: Introductionmentioning

confidence: 99%

Selective Harmonic Measurement and Compensation Using Smart Inverters in a Microgrid with Distributed Generation

Sousa

Monteiro

Afonso

2018

2018 IEEE 16th International Conference on Industrial Informatics (INDIN)

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This paper presents a frequency domain selective harmonic measurement and compensation using smart inverters (SIs) applied to a microgrid with distributed generation. The compensation current is calculated by a main processing unit (MPU), which controls the compensation action of each distributed generation unit (DGU) connected to the microgrid. A single fast Fourier transform (FFT) is implemented to obtain the frequency spectra of the power grid voltages and the currents consumed by the connected loads. Based on the calculated compensation currents and the availability of the DGUs, the MPU establishes the harmonic orders that each DGU should compensate, aiming to equalize the rms current values among the different DGUs. The proposed approach intends to optimize the DGUs efficiency in the microgrid and, additionally, it allows the connection of the converters to the power grid without the need for a synchronization algorithm. A comprehensive description of the implemented FFT algorithm is performed and, finally, the operation of the proposed scheme is verified by simulation results.

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Benefits of power electronic interfaces for distributed energy systems

Cited by 89 publications

References 16 publications

State of the Art in Research on Microgrids: A Review

State of the Art in Research on Microgrids: A Review

Active control of DC fault currents in DC solid-state transformers during ride-through operation of multi-terminal HVDC systems

Selective Harmonic Measurement and Compensation Using Smart Inverters in a Microgrid with Distributed Generation

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