A System for Controlling the Thermal Behavior of Voltage Source Inverters
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stem for Controlling the Thermal Behavior of Voltage Source Inverters Yu. M. In’kova, *, A. S. Kosmodamianskya, A. V. Lukinb, A. A. Pugachevc, and N. N. Strekalova a
Russian University of Transport, Moscow, 127994 Russia b OOO MMP-Irbis, Moscow, 111033 Russia cBryansk State Technical University, Bryansk, 241035 Russia *e-mail: [email protected] Received June 10, 2020; revised July 7, 2020; accepted July 27, 2020
Abstract—The thermal behavior of semiconductor devices of voltage source inverters for a traction frequency converter and its control systems are investigated. A test bed for studying thermal processes in steady state and transient modes occurring in semiconductor modules with air forced cooling systems is described. The results of an experimental investigation for the Infineon FF300R06KE3 module are analyzed and compared to the results of a mathematical model. Transfer functions of a semiconductor module as an object of temperature control are synthesized with respect to the collector current, cooling air flow, and frequency switching. The control system of thermal behavior of a voltage source inverter with two control actions on the object of temperature control (cooling air flow and frequency switching) is developed. It is proposed to use an electric drive with an induction motor and scalar control system for the purposes of regulating the cooling air flow. The effectiveness of the proposed control system is confirmed by means of simulation in MATLAB/Simulink in transient and steady-state modes. Keywords: frequency converter, autonomous voltage inverter, control system, transfer function, experimental research, simulation, temperature, switching frequency DOI: 10.3103/S1068371220090072
INTRODUCTION Modern traction vehicles use static frequency converters with an autonomous voltage inverter connected to the stator winding to regulate the speed of revolution of induction motors. Since the current in the stator winding and in semiconductor devices of the autonomous voltage inverter is a random variable and depends on several factors (train mass, rail–wheel traction conditions, temperature of surrounding/cooling air, speed of motion, etc.), its most probable working value may be determined by analyzing the operation modes of the electric traction drive [1, 2]. Such analysis shows that the run time of electric traction equipment with maximum loads and maximally admitted temperatures does not exceed 15% of the total run time. Modern cooling systems of traction inverters sometimes cannot or, due to a system’s inertia, have no time to provide the required thermal state of semiconductor elements when working with maximum loads, which inevitably leads to an increase in temperature above the admitted temperature and may cause thermal breakdown of the semiconductor structure. In operation with partial loads, the problem appears of reducing the flow rate of cooling air, which necessarily leads to a corresponding reduction in
power losses both in the hydraulic (aerodynamic) part of the cooling system a
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