جستجوی مقالات مرتبط با کلیدواژه « matrix converter » در نشریات گروه « پدافند غیرعامل »

In this paper, the simulation of a direct matrix converter and the thermal analysis of its protection devices are performed. Nowadays, due to the technological advances in the field of power electronic converters, matrix converters are receiving more and more attention. These converters have many capabilities and are used in various industrial and military applications such as the aerospace industry, offshore platforms, rail transport, borderline military sites, apart from the power grid and similar applications. The main purpose of this paper is to provide a procedure for designing protection subsystems including input filters, protection circuits (snubbers), and heat sinks. The input filter reduces the penetration of disturbances from the converter to the network. On the other hand, due to the high switching frequency, the use of snubber circuits in matrix converters is essential. Also, power circuit devices need thermal protection for long-term operation. In this paper, the aforementioned requirements have been studied using a proposed procedure for a 3 kW matrix converter. The results show the reduction of the input current harmonic distortion due to the performance of the input filter and also the improvement of the step response of the system while reducing the steady state error. Also, the designed snubber circuits have the ability to reduce the voltage stress on the switches by 20%. Moreover, through the finite element analysis, the effect of heat sink in reducing the thermal stress by 60% is demonstrated.

Issue of the electromagnetic launch technology in recent decades has been considered seriously. Power supply makes up sensitive and significant part of this launchers. in the previous power supplies that designed for launchers, the energy storage such as inductors and capacitors are used, that the major disadvantage of this power supplies is great weight and size of them and this problem is a serious limitation for implementation and expansion of these launchers. Also, in some of them, is used indirect method for frequency conversion (AC-DC-AC). In this paper a scheme is proposed that by using the matrix converters, obtains the specifications required for the supply of coil-induction launcher directly, that not required to any energy storages and uses power of electricity network instead of using the energy storage resources.