Synchronous Reference Frame Control Strategy Research Articles

Variable nonlinear gain fuzzy with improved synchronous reference frame control strategy for performance enhancement of unified power quality conditioner

This paper proposes a variable nonlinear gain fuzzy (VNGF) controller and negative-feedback based phase-locked loop (NFPLL) with improved synchronous reference frame (ISRF) control strategy for unified power quality conditioner (UPQC). Several power quality (PQ) problems present in the power distribution network can be exterminated through the proposed VNGF-NFPLL-ISRF control method. The VNGF method employs Takagi-Sugeno Fuzzy (TSF) type numerical consequent rule with a nonlinear alteration of variable control gain for controlling dc-bus capacitor voltage of UPQC, which limits the voltage deviances through the power system perturbations and delivers quick settling time for dc-bus voltage. The scheme of NFPLL based synchronization is built upon presenting a negative-feedback control action in the interior loop of conventional PLL and hence a greater extent of protection to grid as well as load disturbances, unresponsive to noise, harmonics and additional contaminations existing through the signal can be attained. Moreover, the novelty of ISRF control method relies upon nonintervention with low pass filter (LPF) and high pass filter (HPF). As a consequence, the proposed VNGF-NFPLL-ISRF control technique quickly and accurately extracts the reference signal during power system perturbations. The effectiveness of the proposed approach is experimentally validated and a comparative survey has been accomplished with conventional TSF controller based SRF method (TSF-SRF).

Neutral Current Compensation in grid tied Solar PV BES Utility System using Four Leg VSC based DSTATCOM with SRF Control Strategy

In this proposed work, Synchronous Reference Frame (SRF) based control algorithm is used in Photovoltaic (PV) grid integration through Distribution Static Synchronous Compensator (DSTATCOM) with Battery Energy Storage (BES) system for simultaneous mitigation of power quality issues and for real power injection. In order to makeover the issues in the quality of power in the system by compensating neutral current, asymmetrical loads in the four wire three phase nonlinear and unbalanced load distribution system. The highest power of PV is tracked using Incremental Conductance (Inc) method and the voltage of DC bus is preserved by Bidirectional DC-DC Converter (BDDC). The proposed system works as PV-DSTATCOM mode which performs DSTATCOM operation by improving power quality with the capability of transferring the generated PV power to the consumers and Grid, and in BES-DSTATCOM mode it supplies power to the utility load. The proposed system is implemented and modeled for 11kV/440V utility system. The results have been obtained using sim power system tools in MATLAB/SIMULINK environment.

D ouble B oost SEPIC C onverter based M ultifunctional G rid I nteractive I nverter for R enewable E nergy I ntegration

This paper deals with a multi objective control strategy to control the double boost sepic converter (DBSEPIC) based grid interconnected inverter using synchronous reference frame (SRF) control. In the process of renewable integration grid interactive inverter with suggested control can be economize as a 1) power allocation and control between the inverter and grid for load, 2) retrenchment of harmonics in source current, 3) reactive power compensation. In this proposed SRF control strategy there are two different types of controllers are used one is PI controller and another one fractional order sliding mode controller (FOSMC). The simplicity of PI controller and robustness of FOSMC utilised here. The performance of two controllers is compared in terms settling time, peak overshoot and THD through simulation results.