Reduced sensor based control of PV-DSTATCOM with switch current limiting scheme

Ray, Pragnyashree, Ray, Pravat Kumar and Marzband, Mousa (2022) Reduced sensor based control of PV-DSTATCOM with switch current limiting scheme. Energies, 15 (22). p. 8727. ISSN 1996-1073

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Abstract

The work delineated in this paper deals with the reduced sensor based operation of PV-DSTATCOM focusing on the voltage source inverter (VSI) switch current limiting control. Here, the VLLMS algorithm based soft computing technique of PV- DSTATCOM control is mod-ified to incorporate both reduced sensor as well as switch current limiting schemes. Fault condi-tion and uncertain load demand increases the risk of transient or high current flowing through the DSTATCOM switches beyond its capacity which damages the switches and ultimately affects the performance of the system. DSTATCOM is predominantly used for improvement of current related power quality issues by providing non-real power (i.e. the reactive and harmonic com-ponent) of the load demand. Hence, by controlling the amount of non-real power flow from the DSTATCOM, the current through the VSI switches can be limited. During this transient or high current condition, the control transits from power quality improvement mode to protection mode and as a result unity power factor operation at P.C.C is compromised for that period or few cycles of transient condition. Efficient operation of any control demands proper information about the current and voltage of the system which are determined by using sensors but fault in these sensors may deteriorate the controller performance which eventually degrades the system effi-cacy. Therefore, to mitigate this issue the number of measurement units is reduced i.e. meas-urement of current of only two phases for load as well as grid and measurement of line voltages using two voltage sensors instead of three sensors for each phase. The reduction in number of sensors is done without compromising with the controller efficiency. The system is studied using MATLAB/Simulink under different condition of steady- state, varying solar irradiance, increasing load above rated capacity. Further, the proposed control is validated in the developed experi-mental prototype.

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