Experimental Evaluation of a CPT-Based Four-Leg Active Power Compensator for Distributed Generation

Abstract

Abstract -Four-wire microgrids and distribution systems are inherently unbalanced with the presence of negative and zero sequence components in voltages and currents. In small autonomous systems the imbalance, in addition to the harmonic distortion produced by non-linear loads, can significantly affect power quality, loadability and stability of the system. Furthermore, in isolated networks with significant generation from intermittent renewable energy sources, the stiffness of the system is reduced and this could amplify the effects of imbalance on the stability and power quality. To mitigate some of these problems, a novel methodology based on the application of a 4-leg Active Power Filter (APF) is proposed in this paper. The control of the compensator is based on the Conservative Power Theory (CPT) augmented by Resonant Controllers. The behaviour of the proposed system is demonstrated using an experimental prototype deployed in a laboratory scale microgrid Index Terms-Active power filter, conservative power theory, resonant control, microgrids, imbalance, harmonic distortion.

A DC-DC converter-based infinite level inverter as DSTATCOM

“…In recent works, various inner control algorithms are proposed, but many of them are still being developed. However, voltage oriented control and model predictive control are the most promising methods . Voltage oriented control could be realized in both d‐q and α‐β frame, but the simple PI controllers would result in steady‐state error in α‐β frame.…”

“…However, voltage oriented control 37 and model predictive control are the most promising methods. [38][39][40][41][42][43] Voltage oriented control could be realized in both d-q and α-β frame, but the simple PI controllers would result in steady-state error 44 in α-β frame. Model predictive control trusts on the prediction of future values of the state variables.…”

Shunt Active Power Filter Based on Proportional Integral and Multi Vector Resonant Controllers for Compensating Nonlinear Loads

“…In recent years, with the intensification of the global energy crisis, the renewable energy and power electric technology have been integrated, which has promoted the development of distributed generators (DGs) [1,2]. e speed driver of small motor, voltage source converter, and a large number of nonlinear loads including electric arc furnace, high-power rectifier, transducer, and fluorescent are connected to the grid, which will cause harmonic pollution unavoidably [3][4][5].…”

Stability Analysis and Optimization of Wind Energy Conversion System Using Extremum Seeking Output Feedback Controller for Dynamic Wind Speed Variations

“…It's very important to note that the wind turbine output power must stay in the bounded region though there are wind speed variations. In this paper, a nonlinear controller is designed for compensating the modeling errors with reference to feedback linearization technique for stabilizing the power system [13].Here the controller is tested for wind speed without any disturbance and with disturbance to examine the wind turbine model stability [16]. In order to improve the system transient response, we propose a feedback controller on field oriented control approach(FOC) [17], [18].…”