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Controllable harmonic current sharing in islanded microgrids: DG units with programmable resistive behavior towards harmonics

Tine Vandoorn (UGent) , Bart Meersman (UGent) , Jeroen De Kooning (UGent) and Lieven Vandevelde (UGent)
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Abstract
In order to obtain a coordinated approach to integrate the increasing presence of distributed generation (DG) units in the electric power system, the microgrid concept has been introduced. As most DG units use a converter as interface with the grid, new control strategies for these converters are being developed. For the islanded mode of the microgrid, with the voltage-based droop control strategy, active and reactive power balancing and sharing between multiple DG units are achieved. This method makes it also easy to delay changing the output power of the renewable DG units compared to that of the dispatchable DG units without communication. However, to deal with harmonic and nonlinear loads, the power control strategies in general, with the voltage-based control strategy as specific example, need to be modified. Otherwise, the DG units form short-circuits for harmonic currents. Therefore, in this paper, the shunt harmonic impedance method for harmonic damping in the grid-connected mode is adapted for application in islanded microgrids. The voltage-based droop control strategy of the DG units is extended with programmable resistive behavior towards harmonics. In this way, harmonic current sharing between DG units can be achieved in a controllable manner, e.g., according to the ratings of the units.
Keywords
DISTRIBUTION-SYSTEM, CONTROL STRATEGY, SHUNT ACTIVE-FILTER, PARALLEL CONNECTED CONVERTERS, DISTRIBUTED-GENERATION INVERTERS, AUTONOMOUS OPERATION, POWER-GENERATION, IMPEDANCE, COMPENSATION, RESISTANCE, Distributed generation, droop control, harmonic current sharing, microgrid, shunt harmonic impedance

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Citation

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Chicago
Vandoorn, Tine, Bart Meersman, Jeroen De Kooning, and Lieven Vandevelde. 2012. “Controllable Harmonic Current Sharing in Islanded Microgrids: DG Units with Programmable Resistive Behavior Towards Harmonics.” Ieee Transactions on Power Delivery 27 (2): 831–841.
APA
Vandoorn, T., Meersman, B., De Kooning, J., & Vandevelde, L. (2012). Controllable harmonic current sharing in islanded microgrids: DG units with programmable resistive behavior towards harmonics. IEEE TRANSACTIONS ON POWER DELIVERY, 27(2), 831–841.
Vancouver
1.
Vandoorn T, Meersman B, De Kooning J, Vandevelde L. Controllable harmonic current sharing in islanded microgrids: DG units with programmable resistive behavior towards harmonics. IEEE TRANSACTIONS ON POWER DELIVERY. 2012;27(2):831–41.
MLA
Vandoorn, Tine, Bart Meersman, Jeroen De Kooning, et al. “Controllable Harmonic Current Sharing in Islanded Microgrids: DG Units with Programmable Resistive Behavior Towards Harmonics.” IEEE TRANSACTIONS ON POWER DELIVERY 27.2 (2012): 831–841. Print.
@article{1964892,
  abstract     = {In order to obtain a coordinated approach to integrate the increasing presence of distributed generation (DG) units in the electric power system, the microgrid concept has been introduced. As most DG units use a converter as interface with the grid, new control strategies for these converters are being developed. For the islanded mode of the microgrid, with the voltage-based droop control strategy, active and reactive power balancing and sharing between multiple DG units are achieved. This method makes it also easy to delay changing the output power of the renewable DG units compared to that of the dispatchable DG units without communication. However, to deal with harmonic and nonlinear loads, the power control strategies in general, with the voltage-based control strategy as specific example, need to be modified. Otherwise, the DG units form short-circuits for harmonic currents. Therefore, in this paper, the shunt harmonic impedance method for harmonic damping in the grid-connected mode is adapted for application in islanded microgrids. The voltage-based droop control strategy of the DG units is extended with programmable resistive behavior towards harmonics. In this way, harmonic current sharing between DG units can be achieved in a controllable manner, e.g., according to the ratings of the units.},
  author       = {Vandoorn, Tine and Meersman, Bart and De Kooning, Jeroen and Vandevelde, Lieven},
  issn         = {0885-8977},
  journal      = {IEEE TRANSACTIONS ON POWER DELIVERY},
  keyword      = {DISTRIBUTION-SYSTEM,CONTROL STRATEGY,SHUNT ACTIVE-FILTER,PARALLEL CONNECTED CONVERTERS,DISTRIBUTED-GENERATION INVERTERS,AUTONOMOUS OPERATION,POWER-GENERATION,IMPEDANCE,COMPENSATION,RESISTANCE,Distributed generation,droop control,harmonic current sharing,microgrid,shunt harmonic impedance},
  language     = {eng},
  number       = {2},
  pages        = {831--841},
  title        = {Controllable harmonic current sharing in islanded microgrids: DG units with programmable resistive behavior towards harmonics},
  url          = {http://dx.doi.org/10.1109/TPWRD.2011.2176756},
  volume       = {27},
  year         = {2012},
}

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