Fault Detection And Mitigation In Multilevel Converter Statcom
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Date
2017
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Publisher
MPUAT, Udaipur
Abstract
During last few decades many countries all over the world are expanding and
restructuring their power sectors, but one of the most basic requirements of a modern
electric power system is its ability to satisfy the consumer load requirements. In other
words today’s world needs a reliable power system. We need a system that maintains
continuity of supply irrespective of adverse conditions like shortage of power or
disturbances. The system reliability depends on two factors stability and redundancy. For
power shortage various reserves are employed which makes system redundant but for
maintaining power system stability and ensuring efficient operation of power system,
compensation is done. One of the aspects of compensation is to maintain line voltage
within safe limits.
In order to maintain line voltage within safe limits, VAR compensation is done. The
literature clearly dictates that voltage is directly proportional to reactive power, i.e., if
reactive power of line increases then the line voltage also increases and vice-versa. VAR
compensation not only controls line voltage but also improves system stability. For this,
many devices are used like STATCOM, SVCs etc. Though SVCs are cheaper and
simpler yet STATCOM is better, as it has superior V/I characteristics, faster transient
response, greater bandwidth, capable of exchanging both real and reactive power etc.
Hence, for improving system stability, line compensation is done using STATCOM. But
the operation of STATCOM must be uninterrupted and for this fast fault detection and its
mitigation must be done.
This thesis deals with the development of a simple and efficient method of fault detection
and mitigation in multilevel converter STATCOMs. The STATCOM employs a
multilevel converter in order to reduce harmonics along with a DC source. This system
will detect fault in multilevel converter and bypass the faulty module with a healthy
module to maintain efficiency and operation of STATCOM. The system is modeled using
MATLAB/ Simulink. MATLAB simulations verify the system and its operation.
Description
Fault Detection And Mitigation In Multilevel Converter Statcom
Keywords
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Citation
Bhatnagar and Dave, 2017