Grid simulator for power quality assessment of micro‐grids

Abstract

In this paper, a grid simulator based on a back-to-back inverter topology with resonant controllers is presented. The simulator is able to generate three-phase voltages for a range of amplitudes and frequencies with different types of perturbations, such as voltage sags, steady state unbalanced voltages, low order harmonics and flicker. The aim of this equipment is to test the performance of a given system under such distorted voltages. A prototype of the simulator, consisting of two inverters connected back-to-back to a 380 V three-phase grid and feeding a micro-grid composed of two inverter interfaced distributed generators and a critical load was built and tested. A set of experimental results for linear purely resistive loads, non-linear loads and current controlled inverters is presented to prove the capabilities of the simulator. Finally, a case study is presented by testing a micro-grid.

High-Performance Grid Simulator Using Parallel Structure Fractional Repetitive Control

“…Q(z) is a zero phase moving average filter with the form in (13). It is introduced to supress the unexpected high frequency repetitive disturbance.…”

Um Algoritmo Robusto e Rápido para Detecção de Afundamento de Tensão

“…O experimento foi realizado no laboratório de Microgrid Research da universidade de Aalborg, utilizando-se o emulador de rede apresentado em [36]. O emulador é composto por dois inversores em topologia back-to-back com um filtro de entrada tipo LCL e um de saída tipo LC.…”

Optimization and Comparative Evaluation of Multiloop Control Schemes for Controllable AC Sources With Two-Stage <inline-formula> <tex-math notation="LaTeX">$LC$</tex-math> </inline-formula> Output Filters

“…Controllable AC voltage sources (CVSs) are in recent years emerging in the area of power-hardware-in-the-loop (PHIL) simulations to emulate mains connected loads / generators to analyze power grid dynamics and control strategies [1], [2], to emulate grid faults to test power electronic equipment [3]- [5], to emulate motor / generator characteristics to verify the correct operation of novel drive systems [6], [7], and to develop and conduct type tests on power electronic converters [8]- [11]. Fig.…”

“…This includes linear loads, e.g. DC, single-phase AC, and three-phase AC (balanced and unbalanced) resistive and / or inductive loads [3], [8], [11], [14], [15], and non-linear loads, e.g. constant-power loads [16], [17], diode rectifiers [3], [6], [14], and single-phase triac loads [8].…”