DC voltage regulation of compensator plays a significant role in tracking performance of STATCOM. It is a common practice to employ voltage source inverter with split -capacitor topology for shunt compensator in three phase four wire systems. However, drift in each capacitor voltage is observed with the presence of dc component in zero sequence current although STATCOM control unit regulates total dc voltage, which results in poor tracking of reference current by the compensator. An external voltage balancing circuit is identified to be a good solution to overcome this problem. This paper proposes an improved controller for external voltage balancing circuit to restore the dc capacitors voltage. The effectiveness of the proposed control of external voltage balancing circuit is verified by simulation results showing restoration of capacitors voltage drift and there by the restoration of tracking performance of the compensator.
Renewable Energy fed non-isolated negative output Converter with dc-dc conversion is proposed which employed for various applications. In industrial purposes only few converters are available for wide conversion ratio, the proposed design has come up with wide range negative voltage load applications. The proposed converter is analyzed and design for continuous condition mode. For verification of theoretical analysis, the proposed converter is simulated using PSIM 9.0.
In Power systems there are different types of Protection relays and one of types is Overcurrent relays. Overcurrent relay protection could be designed in an easy and cost-effective way. That is the reason why the Overcurrent relays are mostly used in electrical motors, generators, power transformers, distribution system and transmission line system protections etc. When the fault current occurs in a power system or in an any electrical equipment crosses the predefined or threshold value, it generates a trip signal to the Electrical Circuit Breaker. This paper mainly concentrates on IDMT relay through the software model. In that model single-phase to ground, line to line and three phase faults are taken as the fault for examining the relay subsystem .
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