EPE Association: EPE 1991 - 23 - Session 3.1: ACTIVE FILTERS

EPE 1991 - 23 - Session 3.1: ACTIVE FILTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 23 - Session 3.1: ACTIVE FILTERS

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   PERFORMANCE OF VOLTAGE-SOURCE ACTIVE FILTERS
By Thanh-Nam Lê [View]
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Abstract: Load distortion currents can be suppressed by employing active filters which possess some superiorities compared to conventional passive filters. However, desired filtering eflects can only be achieved, when the limited capability of the active filter and its working conditions are taken into account. In the case of the voltage-source active filter using last switching semiconductor power devices, the filtering performance depends widely on the filtering target and the employed signal processing method respectively, on the design features of the filter such as power rating, switching frequency and control method, on the characteristics of the load to be compensated and on the characteristics of the power supply system.

   HARMONIC CURRENT COMPENSATION USING THREE PHASE CURRENT SOURCE CONVERTER
By S.-Y. Choe; K. Heumann [View]
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Abstract: This paper presents some results of studies on a three phase PWM current source converter to suppress harmonics. Two criteria to design an input filter are proposed and the switching frequency of converter is defined by considering a sideband of a pulse pattern. To meet a high dynamic of compensation current control, a new control method is proposed. It reduces not only an oscillation, caused by the resonance of the input filter but also shows a quick response to follow references. An optimal value of the inductive storage is discussed with respect to an operating point. The experimental results of the whole system indicate a significant improvement of compensating characteristics. Besides, experimental results of further applications compensating reactive power and balancing nonllnear a.symmetrical load are also reported.

   A COMBINED SYSTEM OF SHUNT PASSIVE AND SERIES ACTIVE FILTERS: AN ALTERNATIVE TO SHUNT ACTIVE FILTERS
By H. Akagi; H. Fujita; A. Nabae [View]
[Download]

Abstract: This paper deals with a combined system of a shunt passive filter and a series active filter, which aims at an alternative to a shunt active filter and a combined system of a shunt passive filter and a shunt active filter. The shunt passive filter plays a role in filtering harmonics, just. like a conventional one does. On the other hand, the series active filter plays an essential role not only in improving compensation charachteristics of the shunt passive filter used alone, but also in damping parallel and series resonance between the shunt passive filter and the source impedance. A prototype combined system consisting of a shunt passive filter of rating 10kVA and a series active filter of rating 0.18kVA was constructed and tested to compensate for the harmonics produced by a three-phase twelve-pulse thyristor rectifier of rating 20kVA. lnteresting experimental results obtained from the prototype are shown to demonstrate excellent practicability and validity.

   FAST ACTIVE POWER CONTROL OF ROTARY CONDENSER WITH FLYWHEEL BY STATIC PHASE SHIFTER
By Hirotaka Chikaraishi; Wang Yi; Ajisman; Ryuichi Shimada [View]
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Abstract: A new control method for Static Phase Shifter (SPS) connected to a rotary condensor is presented. This method enables a rotary condensor to yield active power wlth fast response due to the flywheel effect at the rotating speed. The relationship between the power and energy from the flywheel effect and the phase shift angle are explained. The results of experiment using a simulator show good agreement with the theoretical energy yield. This study shows that a rotary condenser connected to a main transmission line with SPS can significantly increase the stabllity of the network system. Examples of transmission line faults in double- transmission system are presented. The computer simulations show the possibllity of dynamic power control using the SPS and flywheel effect of the rotary condenser as an energy storage.

   OPERATING PRINCIPLE OF AN ACTIVE HARMONICS FILTER BASED ON FAST CURRENT REGULATION
By M.-X. Wang; H. Pouliquen; M. grandpierre [View]
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Abstract: This paper studies the principle of an active filter performing real-time compensation for harmonic currents, either stationary or non-stationary. The rnodelling of the active filter with an output filter (Lf, Cf) used to attenuate switching ripple, is given. Real-time compensation is provided by fast regulation of harmonic currents. Regulation robustness is then analyzed. Associating a prediction with the regulation makes it possible to improve compensation behavior. Simulation results, taking into account practical conditions, show excellent compensation of harmonic currents.

   SYNCHRONOUS FRAME HARMONIC ISOLATOR USING ACTIVE SERIES FILTER
By S. Bhattacharya; D. M. Divan; B. Banerjee [View]
[Download]

Abstract: A combined system of shunt passive and small rated series active filter acts as a "harmonic isolator" between the source and the load, thus in principle, eliminating the problems of using only shunt passive filters or shunt active filters. The combined system is suitable for harmonic compensation of large VA rated loads because the required rating of the series active filter is much smaller than that of a conventional shunt active power filter, and hence has greater practicability. However the features and the performance of the combined system are greatly influenced by the filtering algorithm employed for the series active filter. lt is shown in this paper that active filtering using a synchronous reference frame (SRF) based compensator achieves excellent harmonic compensation and good decoupling between the source and the load, as compared to an instantaneous reactive power (lRP) theory based compensator. Extensive simulation results are used to establish the superior performance of the synchronous reference frame (SRF) based compensator. The series active filter is being realised using a high bandwidth IGBT based Resonant DC link (RDCL) voltage source inverter.

EPE 1991 - 23 - Session 3.1: ACTIVE FILTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 23 - Session 3.1: ACTIVE FILTERS
	[return to parent folder]

	PERFORMANCE OF VOLTAGE-SOURCE ACTIVE FILTERS By Thanh-Nam Lê	[View] [Download]
Abstract: Load distortion currents can be suppressed by employing active filters which possess some superiorities compared to conventional passive filters. However, desired filtering eflects can only be achieved, when the limited capability of the active filter and its working conditions are taken into account. In the case of the voltage-source active filter using last switching semiconductor power devices, the filtering performance depends widely on the filtering target and the employed signal processing method respectively, on the design features of the filter such as power rating, switching frequency and control method, on the characteristics of the load to be compensated and on the characteristics of the power supply system.

	HARMONIC CURRENT COMPENSATION USING THREE PHASE CURRENT SOURCE CONVERTER By S.-Y. Choe; K. Heumann	[View] [Download]
Abstract: This paper presents some results of studies on a three phase PWM current source converter to suppress harmonics. Two criteria to design an input filter are proposed and the switching frequency of converter is defined by considering a sideband of a pulse pattern. To meet a high dynamic of compensation current control, a new control method is proposed. It reduces not only an oscillation, caused by the resonance of the input filter but also shows a quick response to follow references. An optimal value of the inductive storage is discussed with respect to an operating point. The experimental results of the whole system indicate a significant improvement of compensating characteristics. Besides, experimental results of further applications compensating reactive power and balancing nonllnear a.symmetrical load are also reported.

	A COMBINED SYSTEM OF SHUNT PASSIVE AND SERIES ACTIVE FILTERS: AN ALTERNATIVE TO SHUNT ACTIVE FILTERS By H. Akagi; H. Fujita; A. Nabae	[View] [Download]
Abstract: This paper deals with a combined system of a shunt passive filter and a series active filter, which aims at an alternative to a shunt active filter and a combined system of a shunt passive filter and a shunt active filter. The shunt passive filter plays a role in filtering harmonics, just. like a conventional one does. On the other hand, the series active filter plays an essential role not only in improving compensation charachteristics of the shunt passive filter used alone, but also in damping parallel and series resonance between the shunt passive filter and the source impedance. A prototype combined system consisting of a shunt passive filter of rating 10kVA and a series active filter of rating 0.18kVA was constructed and tested to compensate for the harmonics produced by a three-phase twelve-pulse thyristor rectifier of rating 20kVA. lnteresting experimental results obtained from the prototype are shown to demonstrate excellent practicability and validity.

	FAST ACTIVE POWER CONTROL OF ROTARY CONDENSER WITH FLYWHEEL BY STATIC PHASE SHIFTER By Hirotaka Chikaraishi; Wang Yi; Ajisman; Ryuichi Shimada	[View] [Download]
Abstract: A new control method for Static Phase Shifter (SPS) connected to a rotary condensor is presented. This method enables a rotary condensor to yield active power wlth fast response due to the flywheel effect at the rotating speed. The relationship between the power and energy from the flywheel effect and the phase shift angle are explained. The results of experiment using a simulator show good agreement with the theoretical energy yield. This study shows that a rotary condenser connected to a main transmission line with SPS can significantly increase the stabllity of the network system. Examples of transmission line faults in double- transmission system are presented. The computer simulations show the possibllity of dynamic power control using the SPS and flywheel effect of the rotary condenser as an energy storage.

	OPERATING PRINCIPLE OF AN ACTIVE HARMONICS FILTER BASED ON FAST CURRENT REGULATION By M.-X. Wang; H. Pouliquen; M. grandpierre	[View] [Download]
Abstract: This paper studies the principle of an active filter performing real-time compensation for harmonic currents, either stationary or non-stationary. The rnodelling of the active filter with an output filter (Lf, Cf) used to attenuate switching ripple, is given. Real-time compensation is provided by fast regulation of harmonic currents. Regulation robustness is then analyzed. Associating a prediction with the regulation makes it possible to improve compensation behavior. Simulation results, taking into account practical conditions, show excellent compensation of harmonic currents.

	SYNCHRONOUS FRAME HARMONIC ISOLATOR USING ACTIVE SERIES FILTER By S. Bhattacharya; D. M. Divan; B. Banerjee	[View] [Download]
Abstract: A combined system of shunt passive and small rated series active filter acts as a "harmonic isolator" between the source and the load, thus in principle, eliminating the problems of using only shunt passive filters or shunt active filters. The combined system is suitable for harmonic compensation of large VA rated loads because the required rating of the series active filter is much smaller than that of a conventional shunt active power filter, and hence has greater practicability. However the features and the performance of the combined system are greatly influenced by the filtering algorithm employed for the series active filter. lt is shown in this paper that active filtering using a synchronous reference frame (SRF) based compensator achieves excellent harmonic compensation and good decoupling between the source and the load, as compared to an instantaneous reactive power (lRP) theory based compensator. Extensive simulation results are used to establish the superior performance of the synchronous reference frame (SRF) based compensator. The series active filter is being realised using a high bandwidth IGBT based Resonant DC link (RDCL) voltage source inverter.