Abstract. The paper presents a squirrel-cage induction machine operating as a generator principally designed for use in small wind and hydroelectric power stations. The main advantages of such a generator are its high reliability, low price and costs of operation and maintenance. The asynchronous generator coupled to the grid through the AC/DC/AC converter is capable of generating energy even at low turbine speed. The results of investigations on the AC/DC and DC/AC converters controlled by linear and nonlinear current regulators are also discussed.

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In the paper the battery energy storage system is presented. 40 kVA BES was installed in Electrical Drive and Power Electronics Department of Bialystok Technical University. The article presents the new way of control the battery energy storage through the active power filter. Because of the power coefficient cos decrease and input current deformation the battery energy storage system was equipped with active filter to current distortion elimination. The active power filter's control system uses the optical track which is based on optical fibre. Insensibility important is on the large electromagnetic field in the arrangement of control. This assures the optical system. The test of the implementation of the optical track was introduced in the arrangement IPM among the control system and inverter.