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Underwater sensor networks (UWSN) provide a promising solution for several aquatic applications. Mobile UWSNs are vulnerable to various threats because of their harsh environment, acoustic communication channel, bandwidth limitation, high propagation delay, multipath effect, and mobility. Therefore, appropriate security mechanisms should be included in networking services, such as localization, to...
Black start in power system basically means restoring a generating unit with its auxiliaries supplied by DG set or battery and extending power supply to loads after dead bus charging and energizing a transmission line to seek loads. This is the first step in system restoration post a partial or total black out in any part of an electrical power grid. In view of growing complexity in power system with...
Electrical power system comprising transmission, sub-transmission and distribution networks is one of the critical infrastructures for any country. Blackouts are events that put the electrical power system into a state of severe crisis in no time and the restoration of normalcy post the event is a challenging task. All efforts are made by power system operators worldwide to avoid a scenario that may...
The 6-pulse controlled rectifier circuit is very well known. For proper operation of the 6-pulse rectifier, it is necessary to synchronise the firing signals with the mains voltage, else the operation of the rectifier is affected. A firing angle controller, without using any phase lock loop (PLL), is described here. This scheme employs the dq-reference frame to estimate the magnitude and phase angle...
Grid connected power electronic converters must be synchronized to the mains voltage by using suitable converter control circuit and gate signals, in order to function correctly. Without proper synchronization, the operation of the converter is adversely affected. This paper proposes a method to synchronize power converters to the mains voltage without using a phase-lock-loop (PLL). This is achieved...
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