A Mixed LQRI / PI based Control for Three-Phase UPQCs

Abstract

A mixed Linear Quadratic Regulator with an Integral action control technique applied to a Unified Power Quality Conditioner (UPQC) is presented. The proposed control approach becomes a robust strategy that is able to keep regulation and stability even under extreme parameters and load power factor variations. The design of the controller parameters uses the well known Riccati equation based on the discrete approximation of the linear model of the UPQC. Key waveforms based on simulated extensive work shows the feasibility of the proposed approach.

Enhancing Electric Power Quality Using UPQC: A Comprehensive Overview

“…Furthermore, the output feedback periodicalswitched controller is designed to stabilize the closed-loop system. The authors in [52], [74], [104], and [154] discuss the UPQC system modeling in detail.…”

“…The three-phase system in abc frame is transferred into synchronous dqo frame. The system is then represented in state-space formulation [12], [22], [52], [74], [106], [151]. It is observed that the system is nonlinear on its states as well as on its outputs [73].…”

“…The UPQC system modeling aspects are discussed in [12], [18], [22], [52], [74], [97], [104], [106], [143], [151], [156]. The three-phase system in abc frame is transferred into synchronous dqo frame.…”

“…7. It is the most widely studied UPQC system configuration [12]- [15], [17]- [20], [22], [24], [26], [29], [32]- [34], [36], [38], [39], [42], [44]- [50], [52], [54], [56], [59]- [61], [63], [65], [67], [68], [71], [72], [74], [75], [80], [84], [87], [91], [92], [94]- [100], [103], [109], [112], [113], [115], [117], [119], [120], [124], [127], [131]- [139], [141], [143], …”

Mitigation of Power Quality Problems Using Custom Power Devices: A Review

“…s  represents the series APF voltage, reference load voltage and source voltage. The system modeling aspects of the UPQC are reported in [56][57][58][59][60][61][62][63]. In [64], a mathematical modeling and design of a versatile UPQC are discussed clearly.…”