A Novel Method for Anti-Islanding using Reactive Power

Jeong, Jin Beom; Kim, Hee Jun; Ahn, Kang Soon; Kang, Chan Ho

doi:10.1109/intlec.2005.335202

Cited by 22 publications

(19 citation statements)

References 2 publications

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“…In [5], a bilateral reactive power injection method was proposed with the magnitude smaller than 2.5% of the active power as shown in Fig. 3.…”

Section: Conventional Reactive Power Injection Methodsmentioning

confidence: 99%

“…Even though the detection method succeeds for the single distributed generation unit, the possibility of the detection would decrease for the multiple converters [7]. The worst cases in the operation of two distributed generation units for the methods in [5] and [6] are shown in Fig. 5 and Fig.…”

Section: Conventional Reactive Power Injection Methodsmentioning

confidence: 99%

“…Among the reported active methods, reactive power injection schemes are attractive because of the simplicity of the implementation [5][6]. The converter periodically changes its output reactive power and then the system frequency at the islanding drifts away from the normal operation region.…”

Section: Introductionmentioning

confidence: 99%

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A bilateral reactive power injection method for islanding detection of grid-connected converters in distributed generation units

Cho

Lee

Chee

et al. 2015

2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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In this paper, a bilateral reactive power injection method is proposed for islanding detection of gridconnected converters in distributed generation units. The proposed method injects capacitive and inductive reactive power periodically with half of the grid frequency to perturb the frequency of point of common coupling (PCC). The magnitude of the injected reactive power is derived in order to remove the non-detection zone and the frequency of the injected reactive power is determined by considering parallel operation of the converters with no communication. In addition, the distortion of the currents by the proposed detection method is analyzed. The effectiveness of the proposed method is experimentally verified through the operation of two converters used for a 10kW battery energy storage system. Index Terms-LCL filter, active damping, gridconnected converter, capacitor current feedback.

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“…In [5], a bilateral reactive power injection method was proposed with the magnitude smaller than 2.5% of the active power as shown in Fig. 3.…”

Section: Conventional Reactive Power Injection Methodsmentioning

confidence: 99%

Section: Conventional Reactive Power Injection Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A bilateral reactive power injection method for islanding detection of grid-connected converters in distributed generation units

Cho

Lee

Chee

et al. 2015

2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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“…Quality factor of a parallel RLC load can be represented as two pi times the ratio of the maximum stored energy to the energy dissipated per cycle at a given frequency [9]. In mathematical terms, Q f can be presented as in (4). The R, L and C values of the load were calculated from (5) - (7) thus taking the quality factor of the load (4) into account.…”

Section: The Proposed Ai Protection Methodsmentioning

confidence: 99%

“…[2], [3] Reactive power variation (RPV) is one of the effective ways for drifting frequency out of the underfrequency (UF) or overfrequency (OF) limits. Reference [4] presented an AI method based on constant bilateral injection of RPV pulses. The injected RPV pulse varies between two values, i.e., ±2.5% of the active power.…”

Section: Introductionmentioning

confidence: 99%

A novel anti-islanding protection method based on the combination of a Q-f droop and RPV

Raipala

Mäkinen

Repo

et al. 2014

IEEE PES Innovative Smart Grid Technologies, Europe

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All distributed generating units need to be equipped with an anti-islanding (AI) protection scheme in order to avoid unintentional islanding. Unfortunately most AI methods fail to detect islanding when the islanded load matches with the production in the island. Another concerning issue is that certain active AI protection schemes may cause power quality problems. This paper proposes an AI protection method which is based on the combination of a specially designed reactive power versus frequency (Q-f) droop, and a constantly injected reactive power variation (RPV) pulse. The method is designed so that the injection of reactive power is of minor scale during normal operating conditions. Yet, the method shows high performance during islanding. Simulations were performed with the help of PSCAD/EMTDC in order to analyze the performance of the method. The results indicate that the method is able to detect islanding within 2 seconds even in a perfectly balanced island.

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Islanding Detection

2010

Grid Converters for Photovoltaic and Wind Power Systems

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A higher penetration of distributed power generation systems (DPGSs), involving both conventional and renewable technologies, is changing the power system face. There is a clear evolution towards active grids that could include a significant amount of storage systems, could work in island mode and could be connected through flexible transmission systems. This complex scenario will put different requirements on the DPGS units depending on their size and on their level of integration with the power system. Thus the monitoring of the grid condition will always be a crucial feature of the DPGS units at every level. The detection of a possible island condition will always be important in a power system with a significant amount of DPGS.Typically in a low-power DPGS like, for example, PV systems, this feature is defined as an 'anti-islanding requirement' in order to highlight the request of the utility operator, as pointed out in Chapter 2, that the DPGS should disconnect in case the main electric grid should cease to energize the distribution line. A higher power DPGS, typically wind plants, have completely different requirements and generally benefits of communication systems and a supervisory control that interact with the utility operator in view of making the DPGS contribute to the stability of the grid. Here the latest grid codes require low-voltage ride-through capability, meaning that they should stay connected during grid faults, which is quite opposite for the PV systems. Hence islanding detection can be considered a requirement only for low-power DPGSs. However, as already pointed out, the power system is evolving and the future scenario may consider the presence of a smart micro-grid (SMG) usually operated in connection to distribution grids but with the capability of automatically switching to a stand-alone operation if faults occur in the main distribution grid, and then reconnecting to the grid. Since it is not possible to predict the level of connection and the reliability of the information exchange among the different players of this future scenario, the detection of islanding can be considered as an important feature, requested in some cases and optional in others.In this chapter islanding detection will be treated with attention paid to the consequences of an uncontrolled islanding (amplitude and frequency variation of the grid voltage, which are usually the first signs of the island condition) and to the performances of the islanding detection methods: reliability, selectivity and minimum perturbation. Ideally, the methods should be able

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A Novel Method for Anti-Islanding using Reactive Power

Cited by 22 publications

References 2 publications

A bilateral reactive power injection method for islanding detection of grid-connected converters in distributed generation units

A bilateral reactive power injection method for islanding detection of grid-connected converters in distributed generation units

A novel anti-islanding protection method based on the combination of a Q-f droop and RPV

Islanding Detection

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