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 EPE 1995 - 08 - Lecture Session L2d: ACTIVE FILTERS 
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   VOLTAGE HARMONICS SOURCE COMPENSATION USING A SHUNT ACTIVE FILTER 
 By H. Pouliquen; P. Lemerie; E. Plantive 
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Abstract: In a highly polluted network, the shunt filter is connected downstream of a medium-voltage/low-voltage transformer supplying a load which is sensitive to harmonics. To compensate for voltage harmonics, two control principles are developed; the more novel of which only uses a measurement on the low-voltage side of the transformer and presents a new method of fIltering by elimination of harmonic disturbances.

 
   DAMPING HARMONICS IN THE POWER SYSTEM WITH ACTIVE FILTERS 
 By Marcos Pereira; Kadry Sadek 
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Abstract: This paper discusses the basic types of active power filters for power systems and their realization including comments on the control scheme and some application examples. The main characteristics are discussed and a comparison to passive filters is also made, where applicable.

 
   ACTIVE CURRENT FILTER FOR MV / HV NETWORKS 
 By S. Loudot; H. Pouliquen; T. Meynard; Y. Cheron 
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Abstract: This paper presents the study of a hybrid active-passive filter for transport and distribution networks. The passive part allows to reduce voltage and apparent power of the active part. Despite its reduced voltage and power, an original structure had to be used: the multilevel converter with imbricated cells. After having described functioning and control laws of the active part, a simulation of the global hybrid system is realized on a 20 kV network.

 
   A NEW CONTROL STRATEGY OF COMBINED SYSTEM OF SERIES ACTIVE AND SHUNT PASSIVE FILTERS FOR MINIMISING PASSIVE FILTER NUMBER 
 By HervĂ© POULIQUEN; Eric BETTEGA; Miaoxin WANG 
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Abstract: This paper describes a new control strategy of combined system of series active and shunt passive filters. Usual control strategy inherently results in an important number of passive filters in order to keep terminal voltage harmonic distortion from exceeding acceptable level. The proposed control strategy consists of measuring both source current and source voltage and applying two different gains to generate reference signal for active filter. These gains are variable in different ways with frequency in according with installed passive filters and load current spectrum, in order to achieve satisfactory harmonic current and voltage compensating characteristics. Simulation and experimental results show that the proposed control strategy enables to achieve satisfactory compensation of harmonic current with minimum number of passive filters, and to maintain load terminal voltage distortion at a low level even in case of large background voltage distortion.