Experimental studies of charge of non-superconductive magnetic energy storage
One of the urgent tasks of railway transport development connected with the problem of power saving according to “The strategic directions of scientific and technical development of OAO RZD for the period of up to 2015” is a wide use of power-intensive energy storages in the main technological processes of power consumption and energy generation. Owing to the progress in the field of manufacturing high temperature superconductors of the second generation, the use of superconducting magnetic energy storages (SMES) is the most promising. A feature of induction coils, which are inductive energy storage as receivers and sources, according to the laws of commutation is inability to change current quickly through induction. This makes difficult to connect superconducting magnet directly to energy sources and receivers of traditional performance. This means that SMES require special charging circuits. The most viable is to charge coil via intermediate capacitor (capacitance storage (CS)). In this case, coil charge will be on phased basis, taking character of pulse pump of energy. The advantages of this modification are that energy source released from handling large, slowly varying currents, resulting in possibility to flexibly adjust magnitude and duration of coil charge depending on the required charging mode. To verify that the scheme of charging inductive energy storage via intermediate capacitor non-superconductive magnetic energy storage which, unlike superconductive has a finite resistance, has been used. The authors confirmed working capacity of charging scheme for inductive energy storage via intermediate capacitor on phased basis. It is noted that maximum current value during charge of CS increases with capacitance value of the intermediate storage and with decreasing series included with CS inductance.