Page 310 - 360.revista de Alta Velocidad - Nº 6

Berrios Villalba, Antonio. Martínez Acevedo, José Conrado. Tobajas Guerra, Carlos. Gómez Alors, Antonio.

KEYNOTE

will have an impact in greater or lesser extent in the rest of the system so it must be prepared
to deal with more efficient, safe and reliable as the new scenario occurring.
That all the subsystems mentioned above presents the coordination and synchronization is
required, it is required that there is an element of management to higher level that would
monitor system complete and with ability to communicate the State full system to each and
every one of its parts. This system receives the name of energy management system.

The different types of converters for power that could appear in the defined system are as
follows.

The electronic power converters are systems capable of converting electric energy from one
type to another using different electronic devices. These systems are based on semiconductor
devices to control or modify voltages and currents. They are used to adapt the nature and levels
of voltages and currents between the different parts of an electrical system. Typical applications
of power electronics are, among others, the conversion of power alternating (AC) into direct
current (DC), DC to AC conversion, the conversion of a non-regulated in a DC voltage regulated
DC voltage and the conversion of a given amplitude and frequency in another amplitude and
frequency different AC power.
The following classification of converters can carry out depending on the nature of the input
and the output of the converter:

• AC/DC converters
• DC/DC converters

• AC/AC converters
• DC/AC converters

AC/DC Converter: This type of converters produces a DC current from an alternating current.
Generically they are called rectifiers. Depending on the level of power handling, your topology
will be three-phase, high power, or single phase. Last is given to any type of power converter.

DC/AC converter: Commonly called investors and its purpose is the convert direct current into
alternating current.
The two remaining cases AC/AC and DC/DC, are used to adjust the amplitude and frequency in
the case of the former, the tension between two different stages of an electrical system.
Other options are presented depending on the characteristics of modulation used, number of
switches, etc.:

• Matrix converters
• High frequency (HF) converters
• Bi-Level and multilevel converters

MATRIX CONVERTERS: Inverter three-phase crap that consists of a set of bi-directional switches
that connect a three-phase load directly to the line of three-phase power.
HIGH FREQUENCY CONVERTERS: This type of converters has an extra stage in the conversion of
electrical energy that is to perform the conversion in high frequency.
MULTILEVEL CONVERTERS: These converters have interesting advantages over traditional solutions
for the conversion of energy from renewable sources.
An active filter is an electronic device that uses energy stored, either in a capacitor or a coil to

308 360.revista de alta velocidad