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Abstract
Numerous industrial applications involve loads that are very sensitive to electrical supply instabilities. These instances involve various types of voltage imbalances as well as more serious disturbances such as symmetrical and asymmetrical faults. This paper proposes a cost-effective voltage imbalance and asymmetrical fault correction solution for the three phase sensitive loads utilizing an industry-standard current regulated voltage source inverter by connecting it in parallel to the grid mains powering to the sensitive load. The inverter regulates the current for the load and never permits it to go beyond a prescribed value under any type of asymmetrical fault condition, which ensures high power regulating and conditioning capacities. Experimental results are obtained from a small laboratory size prototype to validate the operation of the proposed technique.
Highlights
Fault management is a matter of great interest since electrical disturbances can cause a number of serious problems in the electrical transmission and distribution systems as well as for sensitive loads.In general, faults can either be symmetrical or asymmetrical
The proposed asymmetrical fault correction technique for the sensitive loads is based upon following principles:
The hardware for the proposed asymmetrical fault correction technique for sensitive loads consists of three major parts: a digital signal processor (DSP) controller for implementing the control requirements for the inverter of the proposed system, power components to handle the power flow, and an RL load
Summary
Fault management is a matter of great interest since electrical disturbances can cause a number of serious problems in the electrical transmission and distribution systems as well as for sensitive loads. The majority of loads, which are, generally, away from the fault location, will experience a sag of a magnitude depending upon the distance between the load and fault location, and the duration required for the operation of the protection devices and schemes installed at the utility side [13]. The conventional means for industrial consumers to deal with asymmetrical faults and to avoid substantial financial losses is to install various types of power regulating and conditioning devices Some of these devices require transformers for the electrical isolation purpose, voltage regulator, transformerless dynamic series compensator, etc.) within the sensitive which increases the overall cost,devices and weight the system for andthe makes them unfavorable load applications Somesize, of these requireoftransformers electrical isolation purpose, to bewhich installed within domestic and industrial applications. Applications [16,17]
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