An Algorithm for Stabilizing the Thermal Operating Conditions of Power Semiconductors in a Compressor Electric Drive
Abstract
A parametric approach for stabilizing the thermal state of power semiconductors in the converter for electrically driving the compressor used in subway trains is considered. Such an electric drive system is repeatedly switched in operation for a short period of time. The drive operates for approximately 5 min to fill the pneumatic system with compressed air, after which it is disconnected until the pressure in the system reduces due to compressed air consumption for braking the train or for opening and closing the doors. With such operation mode, semiconductors experience cyclic heating and cooling, due to which the problem of thermocycling is of significant importance for the power transistor modules used in such converter. Deviation of the crystal temperature above the transistor module substrate has a detrimental effect on the braze layer, causing it to become mechanically destructed and stratified, which eventually results in semiconductor failure. These features should be duly considered in selecting the power circuit configuration and in designing the converter. The compressor electric drive's power converter was designed at the Moscow Power Engineering Institute National Research University's Department of Automated Electric Drives. This converter comprises a step-down DC-to-DC converter producing a stable power supply voltage, a 3-phase inverter taking power supply from this voltage, and a du/dt filter. A thermal stabilization algorithm that has been implemented and tested at laboratory on a real power converter is proposed, the use of which makes it possible to reduce the temperature deviation of crystals in transistor modules. During the pause in the compressor duty cycle, the power converter is changed over to a special heating mode. The changeover to this mode is performed automatically without the need to use special control signals from the upper-level control system, nor does it need to make any additional switching operations in the electric drive's power circuits. The use of the proposed algorithm ensures uniform distribution of heat among all power semiconductors. The thermal images and temperature curves demonstrate the efficiency of this thermal stabilization algorithm in comparison with the usual control algorithm.
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Для цитирования: Анучин А.С., Остриров В.Н., Прудникова Ю.И., Яковенко М.С., Подлесный М.В. Алгоритм термостабилизации силовых полупроводниковых приборов в электроприводе компрессора // Вестник МЭИ. 2017. № 3. С. 13—19. DOI: 10.24160/1993-6982-2017-3-13-19.
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For citation: Anuchin A.S., Ostrirov V.N., Prudnikova Yu.I., Yakovenko M.S., Podlesny M.V. An Algorithm for Stabilizing the
Thermal Operating Conditions of Power Semiconductors in a Compressor Electric Drive. MPEI Vestnik. 2017; 3: 13—19. (in Russian). DOI: 10.24160/1993-6982-2017-3-13-19.
