Abstract
High-voltage converter employing IGCT switches (VDC=2800 V) for traction application is presented. Such a power traction drive operates with an unstable input voltage over 2000⋯4000 V DC and with an output power up to 1200 kW. The original power circuit of the high-voltage converter is demonstrated. Development of the attractive approach to designing the low-loss snubber circuits of the high-frequency IGCT switches is proposed. It is established on the complex multilevel analysis of the transient phenomena and power losses. The essential characteristics of the critical parameters under transient modes and the relation between the snubber circuit parameters and the losses are discussed. Experimental results for the prototype demonstrate the properties of new power circuit. The test results confirm the proposed high-voltage converter performance capability as well as verifying the suitability of the conception for its use in the Russian suburban train power system and other high-voltage applications.
Highlights
Nowadays, most suburban trains in Russia have 2 head carriages, 5 or 6 motor carriages, and 3 or 4 auxiliary carriages [1]
It should be noted that total losses in defence circuits for the converters of the Russian suburban trains are much higher because of the high supply voltage 2000 ⋅ ⋅ ⋅ 4000 V DC [2–4]
The analysis shows that the maximum values of the surge current (Figure 4), the rate of the rise of on-state surge current, maximum nonrepetitive peak voltage, and the rate of rise off-state voltage dV/dt over the power semiconductor switch VS1 in the emergency regimes are decreased when the inductor values of L1 are increased
Summary
Most suburban trains in Russia have 2 head carriages, 5 or 6 motor carriages, and 3 or 4 auxiliary carriages [1]. It should be noted that total losses in defence circuits for the converters of the Russian suburban trains are much higher because of the high supply voltage 2000 ⋅ ⋅ ⋅ 4000 V DC [2–4]. Owing to this high-voltage level the power losses are increasing 10 ⋅ ⋅ ⋅ 30 times in comparison with supply voltage 750 V DC or 1500 V DC. The described difficulties in designing a power traction drive require unusual approaches and decisions in designing high-voltage converter as a system, as well as in choosing power device and snubber circuits, control systems, and so forth.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
