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A Review of Active Power Filters In Power System Applications

Anju Jacob, Babitha T Abraham, Nisha Prakash, Riya Philip,

In recent years there has been considerable interest in the development and applications of active filters, at both distribution and consumer levels, and the need to control reactive power and voltage stability at transmission levels. Active power filters are the emerging devices, which can perform the job of harmonic elimination more effectively. The active power filters are used to filter out higher as well as lower order harmonics in the power system. The report deals with the basic working and classifications of active power filters, its reference signal generation techniques and some of the controlling schemes of APF. One of the key points for a proper implementation of an active filter is to use a good method for current/voltage reference generation. There exist many implementations supported by different theories proposing ever better solutions. This paper introduces some of the commonly used theories. Also for efficient working of active power filter better controlling techniques have to be implemented. The paper presents a brief study of active power filter (APF) control strategies put forward recently. It is aimed at providing a broad perspective on the status of APF control methods for better operation of the system.