A new multiple-stage converter topology for high power and high precision fast pulsed current sources
A new high current, low rise time and high precision pulse generator is presented. The topology is based on the use of different stages, each one specific for a particular operation range in terms of power and switching frequency. The design and operating principle of the proposed topology are described. Finally, the results obtained from an implemented reduced scale prototype are compared with the simulation ones in order to validate the design.
The performance of the new generation, dynamic mode, current source power supplies with energy recuperation ability to the DC-link
This paper presents an application of the developed platform for dynamic mode, current source power supplies with ability of energy recuperation from the load to the dc-link capacitors of the power supply. The developed universal and modular platform is suitable for current source power supplies feeding superconducting magnets in particle accelerators with lower energy stored in magnets and with lower magnet voltages. The main advantages of the developed power supply platform are the energy regeneration ability from the low voltage output to the DC-link capacitors and the high dynamic accuracy of the output current control. An application example of the developed concept is the modular power supply PS15000-25D, with parameters 15000 A of output current and 25 V of output voltage. It was developed for the Joint Institute for Nuclear Research, JINR, Dubna, Russia. This paper presents some design aspects, performances and test results of the developed power supply concept.
Power semiconductors in transmission and distribution applications
Triggered by rapidly changing market conditions in the utility sector and fueled by advances in high power semiconductors, a silent revolution is taking place in development of transmission and distribution (T&D) system technologies. Innovation in high power, high speed gate-controlled semiconductor switches is now making it possible to utilize state-of-the-art voltage source converters (VSC) for systems rated between a few MVA to a few 100s of MVA. The result has been nothing short of spectacular in terms of functionality of the new systems and the resulting application opportunities. The semiconductor contents of such systems have increased many folds in comparison to the traditional current source converters (CSC)-mostly at the expense of bulky passive components. One senses for the first time that the marriage between power electronics and T and D system is finally consummated.