Matrix Converter-Based Unified Power-Flow Controllers: Advanced Direct Power Control Method

Abstract

This paper presents a direct power control (DPC) for three-phase matrix converters operating as unified power flow controllers (UPFCs). Matrix converters (MCs) allow the direct ac/ac power conversion without dc energy storage links; therefore, the MC-based UPFC (MC-UPFC) has reduced volume and cost, reduced capacitor power losses, together with higher reliability. Theoretical principles of direct power control (DPC) based on sliding mode control techniques are established for an MC-UPFC dynamic model including the input filter. As a result, line active and reactive power, together with ac supply reactive power, can be directly controlled by selecting an appropriate matrix converter switching state guaranteeing good steady-state and dynamic responses. Experimental results of DPC controllers for MC-UPFC show decoupled active and reactive power control, zero steady-state tracking error, and fast response times. Compared to an MC-UPFC using active and reactive power linear controllers based on a modified Venturini high-frequency PWM modulator, the experimental results of the advanced DPC-MC guarantee faster responses without overshoot and no steady-state error, presenting no crosscoupling in dynamic and steady-state responses.

A review of predictive control techniques for matrix converter applications

“…for Matrix Converters Scalar Techniques [5], [6] Pulse Width Modulation [7]- [10] Direct Torque Control [11], [12] Direct Power Control [13], [14] Model Predictive Control [15]- [38] Other Methods Direct Transfer Function [5] Scalar (Roy) [6] Carrier Based PWM [7], [8] Space Vector Modulation [9], [10] Predictive Current Control [15]- [24] Predictive Torque Control [25]- [29] Predictive Power Control [30]- [33] Predictive Voltage Control [34]- [36] Unity Transfer [37], [38] [40], [41] Fig. 2.…”

Transformerless UPFC Using Multilevel Inverter

“…This topology comprises of series of power transformation cells can be essentially scaled [7][8][9]. The mix of capacitors and switches pair combined is called an H-bridge and gives the dissimilar input DC voltage for each H-bridge.…”

“…Fig 2.2 Single-Phase Arrangement of an n-Level Cascaded Inverter 2.2 Operating Principle 1) Unlike the conventional back-to-back dc link coupling, the transformer-less UPFC requires no transformer, then it can achieve low cost, light weight, compact, increases efficiency and reliability. 2) The shunt inverter is connected after the series inverter, that is entirely vary from the traditional UPFC [9]. 3) The new UPFC utilizes modular CMIs and their inherent redundancy provides greater flexibility and higher reliability.…”

Controller Design Using Coefficient Diagram Methods for Matrix Converter Based Unified Power Flow Controllers

“…In this study a MC based UPFC [2] is adopted for the FACTS device. FACTS is a system composed of static equipment based on power electronics technology and controls one or more AC transmission systems to enhance controllability and increase power transfer capability [4].…”