TY - GEN
T1 - A model-based controller for a three-phase four-leg shunt active filter with homopolar current compensation
AU - Torres-Olguin, R. E.
AU - Escobar, G.
AU - Valdez, A. A.
AU - Martinez-Montejano, M. F.
PY - 2008
Y1 - 2008
N2 - This paper presents a model-based controller for a three-phase four-wire shunt active filter which uses a four-leg topology to implement the voltage source inverter. The proposed controller is able to compensate the homopolar current component due to an unbalanced load, thus, reducing the current flowing to the source via the neutral line, which is caused by distorting loads connected between a phase and the neutral line. In addition to the homopolar current compensation, the controller is able to compensate the usual issues found in three-wire systems, that is, reactive power and harmonic distortion in the general case of distorted and unbalanced source voltages and load currents. The complete model in (fixed frame)αβγ-coordinates is presented. It is shown that the γ component of the three legs input control acts in cooperation with the input control of the fourth leg to achieve the homopolar current compensation. This cooperative work has the effect of enlarging the range of the effective control action. Additionally, this opens the possibility of alternative modulation schemes for four-leg topologies. Numerical tests are provided to illustrate the benefits of our solution.
AB - This paper presents a model-based controller for a three-phase four-wire shunt active filter which uses a four-leg topology to implement the voltage source inverter. The proposed controller is able to compensate the homopolar current component due to an unbalanced load, thus, reducing the current flowing to the source via the neutral line, which is caused by distorting loads connected between a phase and the neutral line. In addition to the homopolar current compensation, the controller is able to compensate the usual issues found in three-wire systems, that is, reactive power and harmonic distortion in the general case of distorted and unbalanced source voltages and load currents. The complete model in (fixed frame)αβγ-coordinates is presented. It is shown that the γ component of the three legs input control acts in cooperation with the input control of the fourth leg to achieve the homopolar current compensation. This cooperative work has the effect of enlarging the range of the effective control action. Additionally, this opens the possibility of alternative modulation schemes for four-leg topologies. Numerical tests are provided to illustrate the benefits of our solution.
KW - Active filters
KW - Adaptive control
KW - Four-leg voltage
KW - Source inverters
UR - http://www.scopus.com/inward/record.url?scp=56649099273&partnerID=8YFLogxK
U2 - 10.1109/CIEP.2008.4653809
DO - 10.1109/CIEP.2008.4653809
M3 - Conference contribution
AN - SCOPUS:56649099273
SN - 9781424427185
T3 - International Power Electronics Congress - CIEP
SP - 63
EP - 68
BT - Proceedings of the 11th IEEE International Conference on Power Electronics Congress, CIEP 2008
T2 - 11th IEEE International Conference on Power Electronics Congress, CIEP 2008
Y2 - 24 August 2008 through 27 August 2008
ER -