Abstract
A control structure design of a three-phase three-leg four-wire grid-tied Distribution Static Synchronous Compensator (DSTATCOM) based on a combined-step-size real-coefficient improved proportionate affine projection sign algorithm (CSS-RIP-APSA) has been presented. The three-phase four-wire DSTATCOM is used for reactive power compensation along with harmonic current minimization. This strategy also helps in load balancing and neutral current compensation. The affine projection sign algorithm (APSA) is a member of the adaptive filter family, which has a slow convergence rate. The conventional adaptive filter deals with the trade-off between the convergence rate and the steady-state error. In the proposed algorithm, the RIP-APSA adaptive filter with two different step sizes has been designed to decrease the computational burden while achieving the advantages of a fast convergence rate and reduced steady-state error. The proposed controller also makes the inverter function a shunt compensator. The controller primarily evaluates the fundamental weight component of distorted load currents. The aim of the proposed system is to compensate for reactive power and to ensure unity power factor during the faulty conditions as well as for unbalancing grid conditions. The proposed control algorithm of the grid-tied DSTATCOM works effectively on the laboratory prototype as verified from the experimental results.
Highlights
The basic function of the Distribution Static Synchronous Compensator (DSTATCOM)is to eliminate the system’s current harmonics and supply the reactive power demand of the load at the fundamental frequency
In order to further enhance the performance, improved versions of proportionate filters have been proposed such as improved proportionate affine projection algorithm (APA) (IPAPA) [23], improved RP-affine projection sign algorithm (APSA) (RIP-APSA) [22], improved proportionate normalized LMS (NLMS) [24]
Loss component (Ycploss ) is supplied by the grid through injecting extra active power into the system. This loss component ensures that constant DC-link voltage is maintained by the proportionalintegral (PI) controller at the dc bus of DSTATCOM
Summary
The basic function of the Distribution Static Synchronous Compensator (DSTATCOM). is to eliminate the system’s current harmonics and supply the reactive power demand of the load at the fundamental frequency. In order to further enhance the performance, improved versions of proportionate filters have been proposed such as improved proportionate APA (IPAPA) [23], improved RP-APSA (RIP-APSA) [22], improved proportionate NLMS [24] These filters still suffer the trade-off between the convergence rate and steady-state error. Development of the CSS-RIP-APSA control technique for elimination of the third-order croLabBox. harmonic component present in the grid currents under steady-state and transient. A comparative analysis the proposed controller con dSPACE MicroLabBox. Mitigation the RIP-APSA power quality is issues such as harmonic elimination, vergence, error, sample complexit reactive power, steady-state balancing grid-side current duringtime, voltageand sag, computation and swell.
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