| Abstract |
Cycloconverter fed induction motor drives generates an important integer harmonics together with a broad spectrum consisting of inter-harmonics and sub-harmonics which can be varied by adjustable speed of induction motor (ASD). With regard to the circuit topology, there are three basic kinds of shunt filter, voltage source (VSAF) and current source (CSAF) active filter and passive filter. Use of passive shunt filters alone have some important drawbacks on power distribution system which supply nonlinear loads producing a wide range of harmonic current frequency. Parallel and series resonance with impedance of power system are the phenomenas which distort the voltage of the point of common coupling (PCC). These disadvantages can be reduced by the combined use of the active and passive filters. Compensation of varying current frequency together with a good damping of parallel and series resonance harmonic frequency by active filter and the fixed current frequencies by passive filters can be achieved by an appropriate coordinating their operations. This paper presents a comparison of two hybrid topologies, for compensation of current harmonics produced by a 18-thyristors ot three pulse cycloconverter fed induction motor, from different points of view, such as power circuit design, filtering quality. |
