Inverter design for four-wire microgrids

Heredero-Peris, Daniel; Pagès-Giménez, Marc; Montesinos‐Miracle, Daniel

doi:10.1109/epe.2015.7309363

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…The resonant load purpose is to be the worst scenario for the AI methods based on voltage and frequency displacements (AI-PM (Passive Methods)and AI-PF (Positive Feedback)), refer to Section 3 for better understanding. Thus, the worst scenario occurs assuming the power flow through the PCC (active and passive) to be about zero [28,30]. Accordingly, the conception of zero (ZPF) or non-zero power flow (NZPF) exposed points out the resonant condition.…”

Section: Zero Power Flow Conceptmentioning

confidence: 99%

“…The AI algorithm has been implemented on the 90-kVA VC-VSI inverter based on three Semikron IGD-2-424 power stacks, as shown in Figure 18. The converter was a three-phase four-wire inverter, whose inner control loops (current and voltage) were based on adaptive proportional resonant controllers (PR) [30]. Each active phase was controlled independently by managing the active and reactive power set-points through an AC droop control strategy, as depicted in Figure 1a.…”

Section: Setupmentioning

confidence: 99%

See 1 more Smart Citation

Impedance Measurement and Detection Frequency Bandwidth, a Valid Island Detection Proposal for Voltage Controlled Inverters

Llonch-Masachs¹,

Heredero-Peris²,

Chillón-Antón³

et al. 2019

Applied Sciences

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Anti-islanding detection methods have been part of a secure operation for distributed energy resource inverters, avoiding the creation of non-intentional energization when the mains are lost. These detection mechanisms were conceived historically for current-controlled inverters. New control possibilities have broken ground, and current- or voltage-controlled inverters are a reality; however, special attention must be paid to detection strategies when applied to the latter ones. This paper addresses two topics: it exposes the lack of effectiveness of those detection algorithms based on the voltage/frequency displacement concept under voltage-controlled inverters and evaluates the applicability limits of the others based on the impedance measurement (IM). The IM is presented as a valid mechanism to achieve the islanding detection, but the exploration of its limits drives the concept of detection frequency bandwidth (DFBW), introduced in this paper. The DFBW is suggested as a practical approach to select the proper injection frequency to measure. Therefore, an improved strategy based on the IM and DFBW is proposed to allow achieving the detection towards (non-)resonant loads considering low computational burden. The results were experimentally validated in a 90-kVA four-wire voltage-controlled inverter, offering detection times of less than 100 ms in any case.

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Section: Zero Power Flow Conceptmentioning

confidence: 99%

Section: Setupmentioning

confidence: 99%

Impedance Measurement and Detection Frequency Bandwidth, a Valid Island Detection Proposal for Voltage Controlled Inverters

Llonch-Masachs¹,

Heredero-Peris²,

Chillón-Antón³

et al. 2019

Applied Sciences

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“…In this regard, the SRG project developed the IDPR [31,39,43,44]. An IDPR, like diesel generators, enables isolated operation of the system in case of faults [45]. Thus, the IDPR is a device located at strategic nodes of the distribution network and its main goal is to control power flows.…”

Section: Back-up Resourcesmentioning

confidence: 99%

Smart Grid Architecture for Rural Distribution Networks: Application to a Spanish Pilot Network

et al. 2018

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This paper presents a novel architecture for rural distribution grids. This architecture is designed to modernize traditional rural networks into new Smart Grid ones. The architecture tackles innovation actions on both the power plane and the management plane of the system. In the power plane, the architecture focuses on exploiting the synergies between telecommunications and innovative technologies based on power electronics managing low scale electrical storage. In the management plane, a decentralized management system is proposed based on the addition of two new agents assisting the typical Supervisory Control And Data Acquisition (SCADA) system of distribution system operators. Altogether, the proposed architecture enables operators to use more effectively-in an automated and decentralized way-weak rural distribution systems, increasing the capability to integrate new distributed energy resources. This architecture is being implemented in a real Pilot Network located in Spain, in the frame of the European Smart Rural Grid project. The paper also includes a study case showing one of the potentialities of one of the principal technologies developed in the project and underpinning the realization of the new architecture: the so-called Intelligent Distribution Power Router.

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“…The main challenge of the IDPR in terms of power quality is to compensate for unbalanced currents (of the three-phases), compensating reactive power and cancelling the harmonic content of currents at coupling point, in a slave mode. Also the IDPR can storages energy from distributed generation and provides it during pick hours or during a supply disruption, since the IDPR is the responsible to restore the supply in the network providing a voltage and frequency of the local set, in a master mode [40,41]. Finally, the LCs and TCs are programmable rule-based devices that exchange information and setpoints with the back-up resources, DGs, CDLs, GSs, as well as with control and protection devices.…”

Section: The Proposed Energy Management System For Rural Gridsmentioning

confidence: 99%

“…The active power generated by DGs is bounded by Equation (41). Similarly, the Equation (42) limits the active power injected from BESSs of IDPRs.…”

Section: Variable Descriptionmentioning

confidence: 99%

Optimization of the Operation of Smart Rural Grids through a Novel Energy Management System

2017

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Abstract:The paper proposes an innovative Energy Management System (EMS) that optimizes the grid operation based on economic and technical criteria. The EMS inputs the demand and renewable generation forecasts, electricity prices and the status of the distributed storages through the network, and solves with an optimal quarter-hourly dispatch for controllable resources. The performance of the EMS is quantified through diverse proposed metrics. The analyses were based on a real rural grid from the European FP7 project Smart Rural Grid. The performance of the EMS has been evaluated through some scenarios varying the penetration of distributed generation. The obtained results demonstrate that the inclusion of the EMS from both a technical point of view and an economic perspective for the adopted grid is justified. At the technical level, the inclusion of the EMS permits us to significantly increase the power quality in weak and radial networks. At the economic level and from a certain threshold value in renewables' penetration, the EMS reduces the energy costs for the grid participants, minimizing imports from the external grid and compensating the toll to be paid in the form of the losses incurred by including additional equipment in the network (i.e., distributed storage).

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Inverter design for four-wire microgrids

Cited by 11 publications

References 5 publications

Impedance Measurement and Detection Frequency Bandwidth, a Valid Island Detection Proposal for Voltage Controlled Inverters

Impedance Measurement and Detection Frequency Bandwidth, a Valid Island Detection Proposal for Voltage Controlled Inverters

Smart Grid Architecture for Rural Distribution Networks: Application to a Spanish Pilot Network

Optimization of the Operation of Smart Rural Grids through a Novel Energy Management System

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