Grid-tie three-phase inverter with active power injection and reactive power compensation

Abstract

a b s t r a c tThis paper proposes a methodology for the active and reactive power flow control, applied to a grid-tie three-phase power inverter, considering local and/or regionalized power flow control necessity in the forthcoming distributed generation scenario. The controllers are designed by means of robust pole placement technique, which is determined using the Linear Matrix Inequalities with D-stability criteria. The linearized models used in the control design are obtained by means of feedback linearization, aiming to reduce system nonlinearities, improve the controller's performance and mitigate potential disturbances. Through multi-loop control, the power loop uses active and reactive power transfer adapted expressions to obtain the magnitude of the voltage and power transfer angle to control the power flow between the distributed generation and the utility grid. The methodology main idea is to obtain the best controllers with the lowest gains as possible placing the poles in the left-half s-plane region, resulting in fast responses with reduced oscillations. In order to demonstrate the feasibility of the proposal a 3 kVA three-phase prototype was implemented and a comparison with conventional controller is performed to demonstrate the proposed methodology performance. In addition, anti-islanding detection and protection against over/under voltage and frequency deviations are demonstrated through experimental results.

Solar System Analysis for Different LOADS in Stand-Alone Mode

“…LITERATURE REVIEW Leonardo P.Sampaio et al [5] this article proposes an active and reactive power flow control methodology applied to an inverter connected to the three-phase grid, in which local and / or regionalized power flow control is considered in the next distributed generation scenario. The main idea of the methodology is to obtain the best regulators with the lowest possible gains by placing the poles in the area of the left half of the s-plane, obtaining quick responses with reduced vibrations.…”

Robust Control of Three-Phase VSI with LCL Filter for Distributed Generation Power Quality Improvement

“…Control schemes are responsible for several tasks in the power conversion process such as reference tracking, management of the distributed resource (maximum power point tracking, synchronization, protections, as well), power quality improvements (reduced total harmonic distortion-THD) and protection of the grid, source and loads (Xue et al 2004;Chowdhury et al 2009;de Brito et al 2013). The most common topology used in DGS is the Voltage Source Inverter (Sampaio et al 2016;Teodorescu et al 2011), with or without DC-DC cascaded converters.…”

“…Thus, the control system has to ensure stability considering a range of possible values for this parameter. Some authors has proposed control strategies based on robust controllers synthesized by means of linear matrix inequalities (LMIs) methods as in (Sampaio et al 2016;Maccari et al 2014;Wang et al 2016), however, these methods only deal with the grid connected operation mode. In Buduma and Panda (2018), an optimal LQR control strategy, which allows the operation in both GC and IS modes, is presented; however, no results during the transitions from GC to IS and vice versa are presented.…”

Generalized Discontinuous PWM strategy applied to a grid-connected Modular Multilevel Converter

“…So, Gandoman et al [2] develop a thorough review of FACT technologies, with the purpose of improving the quality of energy in smartgrids. Similarly, Sampaio et al [3] and Artal-Sevil et al [4] propose a strategy to control the active and reactive power flow between a DG and utility grid through a three-phase grid-tie inverter. This improves the efficiency of the converter.…”