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In converters possessing multiple distributed controllers the synchronization of and the communication between the various controllers are important topics requiring careful consideration. The controllers should be able to transmit data and commands to each other so that different control modes can be selected, reference values updated, parameters shared and so forth. Synchronization is important...
Power converters using deterministic pulse width modulation (PWM) schemes have discrete and high harmonics concentrated at well-defined frequencies. In this study, two random PWM strategies to reduce the harmonic spikes for multilevel cascaded H-bridge (CHB) inverters are proposed. The proposed strategies select two nearest voltage levels to approximate output voltage based on simple geometrical calculations...
Fault tolerance in high power multilevel converters is a desirable feature particularly in applications such as marine propulsion where continuity of service is critical. However, the medium voltage drive system's reliability becomes vulnerable due the number of power semiconductor devices in the system. Therefore it is utmost important to identify the faulty device as fast as possible to isolate...
Traditional IGBT turn-on loss evaluation methods are curve fitting of double pulse test data without insight of IGBT turn-on process. This paper proposed an analytical evaluation method of IGBT turn-on loss. In the proposed method, a qualitative IGBT switching waveform and an IGBT switching trajectory in output characteristics are used to analyze IGBT turn-on process. The detailed expressions for...
To provide higher speed and more flexibility, this paper presents a new implementation method of predictive current control (PCC) algorithms for an indirect matrix converter (IMC) using a digital signal processor (DSP) and a field programmable gate array (FPGA). In this method, the SPARTAN-3E FPGA is used as a master controller to execute the PCC and commutation algorithms and the TMS320F28335 DSP...
Real-time simulation has become widely accepted in both academic circles and industry. The technology has been applied to many domains ranging from aerospace power systems to utility power grids. The benefits of real-time simulation are generally realized through rapid control prototyping (RCP) or hardware-in-the-loop (HIL) simulation. When HIL simulation is undertaken, the validity of the results...
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