Balancing Algorithm for a Self-Powered High-Voltage Switch Using Series-Connected IGBTs for HVDC Applications
| Autor: | Colin Charnock Davidson, Javier Chivite-Zabalza, David Reginald Trainer, J.C. Nicholls |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Computer science
Capacitive sensing 020208 electrical & electronic engineering Bipolar junction transistor Direct current High voltage Topology (electrical circuits) Hardware_PERFORMANCEANDRELIABILITY 02 engineering and technology Insulated-gate bipolar transistor law.invention Capacitor law Overvoltage Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Snubber Electronics Electrical and Electronic Engineering Algorithm Voltage |
| Zdroj: | IEEE Transactions on Power Electronics. 34:8481-8490 |
| ISSN: | 1941-0107 0885-8993 |
| DOI: | 10.1109/tpel.2018.2889375 |
| Popis: | This paper presents a balancing algorithm for the so-called Director Switch, a controlled, reverse conducting, self-powered, high-voltage switch, using series-connected insulated gate bipolar transistors (IGBTs). This is a key component on two new voltage-source, high-voltage direct current (HVDC) converter topologies. These, which promise efficiency, cost, and size reductions, are an alternate arm converter and a series bridge converter. One of the main design challenges of the director switch is how to supply the IGBT gate drivers, and other auxiliary electronics while overcoming the high-voltage insulation barrier to ground level. In this paper, this is achieved by using the energy stored in a capacitive clamp snubber circuit, which also helps with the overvoltage mitigation during rare hard-switching events. However, the clamp capacitor and by proxy the IGBT voltages become highly unbalanced during operation, compromising the integrity of the switch. This paper presents a balancing strategy that consists in applying a controlled delay in the switching of the IGBT levels, in a way that forces a voltage balance on all the switch levels. The paper explains the unbalance. Then, the balancing strategy is explained and validated on simulation and on a high-voltage experimental rig, on switches comprising two and three series-connected IGBTs, respectively. |
| Databáze: | OpenAIRE |
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