Neha Beniwal

Adaptive control scheme for three-phase four wire grid tied SPV system with DSTATCOM capabilities

This paper proposes an adaptive modified least mean fourth (MLMF) control scheme with perturb and observe (P&O) technique for a voltage source converter (VSC) connected to solar photovoltaic array (SPV), three single-phase non-linear loads in a three-phase, 4-wire system with DSTATCOM (Distributed Static Compensator) capabilities. The adaptive control scheme based on MLMF shows low mean square error and converges faster. The system is modelled and simulated for power factor correction and zero voltage regulation modes. Due to single stage topology, the system shows high efficacy at high voltages. The neutral load current is well compensated by the VSCs fourth leg current. The harmonics in grid currents are well under the IEEE-519 standard.

A second-order volterra filter based control of SPV-DSTATCOM system to achieve Lyapunov's stability

In this paper, a second-order Volterra filter is used in association with Lyapunovs stability theory to generate the reference currents for a SPV-DSTATCOM (solar photovoltaic-distribution static compensator) system in the distribution system. The SPV-DSTATCOM system is integrated to the grid to compensate a nonlinear load while supplying SPV active power to the grid. The system is implemented on a developed prototype, under balanced, unbalanced loading conditions and variable insolation conditions. The system has a fast response. Moreover, the harmonic distortion of the grid currents is observed under the IEEE-519 standard.

Real time implementation of SECS with active shunt filter capabilities

In this paper, a variable step size filtered X-least mean fourth (FX-LMF) algorithm is proposed for a single-stage three-phase grid tied solar energy conversion system with active shunt filter capabilities. It consists of a SPV (Solar Photovoltaic) array, a voltage source converter, a three-phase grid and connected linear and nonlinear loads. The proposed algorithm helps in faster convergence and it also has less mean square error as compared to fixed step LMF. A prototype of the system is developed and experimental results are obtained while feeding SPV active power to the loads and the grid. The total harmonic distortion of grid current is observed well within the limit of IEEE-519 standard.

Implementation of DSTATCOM with i-PNLMS based control algorithm under abnormal grid conditions

This paper deals with the use of a distribution static compensator (DSTATCOM) to the system constituted by a nonlinear load fed from a distorted grid. Moreover, an improved proportionate normalized least mean square (i-PNLMS) control algorithm is proposed for the DSTATCOM. The system is first modeled on a MATLAB/Simulink platform and its performance is analyzed under steady state and load increment cases. The frequency response of the compensated system is also obtained. Tests are conducted on a laboratory prototype to analyze the systems performance under steady state and load unbalancing. This algorithm helps in achieving the desired grid currents easily and efficiently, and it shows an inherent tendency to adapt to the systems requirements. The obtained total harmonic distortion of grid currents and point of common coupling voltages are within the limits defined in the IEEE-519 standard.