Model predictive‐based shunt active power filter with a new reference current estimation strategy

Abstract

This study presents a new reference current estimation method using proposed robust extended complex Kalman filter (RECKF) together with model predictive current (MPC) control strategy in the development of a three-phase shunt active power filter (SAPF). A new exponential function embedded into the RECKF algorithm helps in the estimation of in phase fundamental component of voltage (v h) at the point of common coupling considering grid perturbations such as distorted voltage, measurement noise and phase angle jump and also for the estimation of fundamental amplitude of the load current (i h). The estimation of these two variables (v h , i h) is used to generate reference signals for MPC. The proposed RECKF-MPC needs less number of voltage sensors and resolves the difficulty of gain tuning of proportional-integral (PI) controller. The proposed RECKF-MPC approach is implemented using MATLAB/SIMULINK and also Opal-RT was used to obtain the real-time results. The results obtained using the proposed RECKF together with different variants of Kalman filters (Kalman filter (KF), extended KF (EKF) and extended complex KF (ECKF)) and PI controller are analysed both in the steady state as well as transient state conditions. From the above experimentation, it was observed that the proposed RECKF-MPC control strategy outperforms over PI controller and other variants of Kalman filtering approaches in terms of reference tracking error, power factor distortion and percentage total harmonic distortion in the SAPF system.

Overview of power quality analysis and control technology for the smart grid

“…Based on the finite control set of the converter, model predictive control (MPC) selects the output switch state to optimize the cost function. It features good dynamic performance, but it is also a challenge to the control system because of a large computation requirement [30][31][32]. However, developments in digital signal processing will contribute to the scale of application of MPC.…”

A Robust LQG Servo Control Strategy of Shunt-Active Power Filter for Power Quality Enhancement

“…KF is used for measurement of harmonics [13], detection of grid perturbations [14] and estimation of fundamental component as well as system variables [15]. For linear systems contaminated with additive noise, KF is found to be an optimum estimator.…”

Adaptive filter based current controller for Shunt Active filter

“…Many filters are designed to infuse the harmonics and reactive current to the supply mains. The Active filter compensates the harmonics and static VAr compensates the reactive power [1][2][3][4][5][6], but both compensation is still under research. The lessening of both issues depends upon the reference current generated by the control algorithm and current controller of the Shunt Active filter (SAF).…”

“…Both involved many transformations and mathematical calculation. Many types of reference current generator of APF are proposed in the literature [1][2][3][4][5]. The harmonic current can be extracted from the load current using frequency domain and time domain.…”