A Fuzzy logic DCLink Voltage Controller for ThreePhase DSTATCOM to Compensate AC and DC Loads

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Author(s) 
Kranthi Kumar Kora 

KEYWORDS 
DClink voltage controller, distribution static compensator (DSTATCOM), fast transient response, harmonics, load compensation, power factor, power quality (PQ), unbalance, voltagesource inverter (VSI),fuzzy logic(FL) 

ABSTRACT 
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 dclink voltage directly. The sudden removal of load would result in an increase in the dclink voltage above the reference value, whereas a sudden increase in load would reduce the dclink voltage below its reference value. The proper operation of DSTATCOM requires variation of the dclink voltage within the prescribed limits. Conventionally, a proportionalintegral (PI) controller and Fastacting controller is used to maintain the dclink 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 dclink voltage controller is slow,the transient response of the FastActing DC link voltage is moderate. In this paper, a fuzzy logic dclink voltage controller based on the energy of a dclink capacitor is proposed. Mathematical equations are given to compute the gains of the conventional controller based on fastacting dclink voltage and fuzzy logic dclink 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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