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International Journal of Scientific and Engineering Research
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ISSN Print: 2229-5518 10    
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scirp IJSER >> Volume 2, Issue 10, October 2011 Edition
A Fuzzy logic DC-Link Voltage Controller for Three-Phase DSTATCOM to Compensate AC and DC Loads
Full Text(PDF, 3000)  PP.  
Kranthi Kumar Kora
DC-link voltage controller, distribution static compensator (DSTATCOM), fast transient response, harmonics, load compensation, power factor, power quality (PQ), unbalance, voltage-source inverter (VSI),fuzzy logic(FL)
A fuzzy Logic controls the transient response of the distribution static compensator (DSTATCOM) is very important while compensating rapidly varying unbalanced and nonlinear loads. Any change in the load affects the dc-link voltage directly. The sudden removal of load would result in an increase in the dc-link voltage above the reference value, whereas a sudden increase in load would reduce the dc-link voltage below its reference value. The proper operation of DSTATCOM requires variation of the dc-link voltage within the prescribed limits. Conventionally, a proportional-integral (PI) controller and Fast-acting controller is used to maintain the dc-link voltage to the reference value. It uses deviation of the capacitor voltage from its reference value as its input. However, the transient response of the conventional PI dc-link voltage controller is slow,the transient response of the Fast-Acting DC link voltage is moderate. In this paper, a fuzzy logic dc-link voltage controller based on the energy of a dc-link capacitor is proposed. Mathematical equations are given to compute the gains of the conventional controller based on fast-acting dc-link voltage and fuzzy logic dc-link voltage controllers to achieve similar fast transient response. The detailed simulation and experimental studies are carried out to validate the proposed controller.
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