Interconnection control of distributed generation with time-synchronized phasors

Mills-Price, Michael; Scharf, M.; Hummel, S.; Ropp, Michael; Joshi, D.; Zweigle, Greg; Ravikumar, Krishnanjan Gubba; Moxley, Roy; Flerchinger, Bill

doi:10.1109/psce.2011.5772546

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…This issue does not impact the systems likelihood to detect an island; rather, if signals are not synchronized, an event on the grid may cause a false-trigger since the time shift results in large frequency and angle areas. [19] In [17], the SynchroPhasor-based anti-islanding approach is discussed and contrasted with passive and active anti-islanding methods as well as PLC. Therein, the authors implement three algorithms: (1) absolute phase angle difference (APAD), (2) wide area method (WAM) where PMU differences are plotted in the slip-acceleration plane, and correlation coefficient based method (CCB) where relative frequencies are correlated.…”

Section: Anti-islanding Using Communication Methodsmentioning

confidence: 99%

Accelerating Development of Advanced Inverters.

Neely

Johnson

Gonzalez

et al. 2015

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Increasing the penetration of distributed renewable sources, including photovoltaic (PV) generators, poses technical challenges for grid management. The grid has been optimized over decades to rely on large centralized power plants with well-established feedback controls. Conventional generators provide relatively constant dispatchable power and help to regulate both voltage and frequency. In contrast, photovoltaic (PV) power is variable, is only as predictable as the weather, and provides no control action. Thus, as conventional generation is displaced by PV power, utility operation stake holders are concerned about managing fluctuations in grid voltage and frequency. Furthermore, since the operation of these distributed resources are bound by certain rules that require they stop delivering power when measured voltage or frequency deviate from the nominal operating point, there are also concerns that a single grid event may cause a large fraction of generation to turn off, triggering a black out or break-up of an electric power system. To mitigate effects on grid voltage and frequency due to increased penetration of distributed energy resources (DERs), new grid support functions (GSFs) have been investigated to allow DERs to participate in voltage and frequency regulation. In addition, new voltage and frequency ride-through (V/FRT) functions are being developed to enable these inverters to remain connected even when voltage and frequency deviate considerably. Unfortunately, the implementation of these functions brings with it a new set of engineering concerns including an increased propensity to unintentionally island, the need to ensure standards of performance, as well as interoperability of multiple inverters on one bus, dynamic response of inverters to load rejection and ground fault, and finally how to address the cyber security threat. To accelerate advanced inverter adoption, this project addresses these potential obstacles, thus enabling increased PV penetration. This project was successful in developing both general/generic and manufacturerspecific transient inverter models and adapting them to include GSFs and V/FRT capability to aid in extensive simulation studies of anti-islanding efficacy. Simulation and experimental studies were done to investigate efficacy of existing anti-islanding schemes and quantify performance. In addition, two new anti-islanding methods were developed and tested in the lab that are robust against the effects of GSFs and V/FRT and are expected to be cost-effective. Furthermore, an extensive testing protocol was developed in collaboration with industry, documented, and applied to commercial and pre-commercial inverters. This test protocol is a potential means by which to certify gridconnected equipment for GSF and V/FRT implementation and ensure a prescribed standard of performance. Finally, a Sandia team began the evaluation of cybersecurity implications of remote commands to DERs implementing GSFs and V/FRT functions.

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Section: Anti-islanding Using Communication Methodsmentioning

confidence: 99%

Accelerating Development of Advanced Inverters.

Neely

Johnson

Gonzalez

et al. 2015

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“…This paper describes a set of affordable, effective CBID methods using synchrophasors, and the value-added proposition of synchrophasors in this application. Three methods of synchrophasor-based island detection that are currently under active investigation [9,10] are reviewed, and the results to date on each are summarized.…”

Section: Introductionmentioning

confidence: 99%

Synchrophasors for island detection

Ropp

Perlenfein

Joshi

et al. 2012

2012 38th IEEE Photovoltaic Specialists Conference

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Detection and prevention of unintentional islands powered by distributed generators like photovoltaics remains a key concern of utility protection engineers, especially in highpenetration and grid-support environments. These evolving circumstances dictate that new island detection tools are needed. Synchrophasors are highly promising in this regard, but some in the community remain skeptical about them due to costs. This paper discusses synchrophasors, how they may be used to detect islands, their cost-reducing value-added features, and synchrophasor-based island detection methods.

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MPPT-Based Inverter Control of Grid-Connected PV–Wind Hybrid Power System

Kumar¹,

Varun²

2020

Advances in Electrical Control and Signal Systems

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Interconnection control of distributed generation with time-synchronized phasors

Cited by 10 publications

References 5 publications

Accelerating Development of Advanced Inverters.

Accelerating Development of Advanced Inverters.

Synchrophasors for island detection

MPPT-Based Inverter Control of Grid-Connected PV–Wind Hybrid Power System

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