Abstract
For the heat loss of frequency converter in 50KW class medium-frequency electron magnetic induction steam generator system, this study explored a new solution for inverter cooling and waste heat recovery, which solved the problem of coolant temperature rise while replacing the cooling water, meanwhile recovered part of the waste heat for re-production. The heat dissipation of the power device is simulated to analyze the rationality of the heat dissipation system structure, and the thermal resistance equivalent circuit is established to realize the accurate calculation of the temperature at each point in the system. Experimental research under different environmental temperatures, power, and total cooling water conditions has been done to test and verify its function, the findings show that the designed heat dissipation system for the medium frequency induction heating power supply device works well, which makes the temperature of all pivotal devices converge to normal operating temperature range and increases the energy efficiency of the system by about 4%. The proposed cooling scheme is suitable for promotion in heating projects with high power equipment.
Highlights
As the core of power conversion and transmission, switch devices (IGBT, etc.) with high-frequency and large-power were widely used in such applications as smart power grids, aerospace, new energy equipment, and so on [1]
Cheng et al.: Analysis of Numerical Simulation about Thermal Management on Frequency Converter themselves, the performance of the heat dissipation system plays an important role in the stability and reliability of the IGBT [2], [3]
The thermal network is often used for thermal management analysis of power electronic equipment, Daohui Li introduced the generation principle of thermal network and its application to monitor the junction temperature of power devices, and realized co-simulation of thermoelectricity [6]
Summary
As the core of power conversion and transmission, switch devices (IGBT, etc.) with high-frequency and large-power were widely used in such applications as smart power grids, aerospace, new energy equipment, and so on [1]. For the converter where water cooling scheme is concerned, if the total circulating water mismatches the heat, the temperature of the circulating water will gradually increase while it works continuously, which will detract the performance of the cooling system, thereby affecting the reliability and life of the power device [12]. This paper presents a cooling solution for waste heat recovery This solution achieves a win-win situation in improving the performance of the heat dissipation system and energy saving by replacing the cooling water and recycling it. This cooling system has advantages of high heat dissipation capability, simple structure, low operating cost and improvement of energy efficiency of the system. The solution is applicable to some small and medium-sized distributed power equipment in heating projects
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