Design and Control of Novel Grid Tied Multilevel Filter-Less Inverter Using Current Based Sliding Mode Control

Abstract

The role of control techniques is increasing due to the high penetration of renewable energy sources at grid level. The importance of inverters also rises as it balances the supply between the renewable source and grid power system. The issues related to penetration of renewable energy like power quality maintenance, protection against the detection of islanding and maintaining the integrity of grid; control techniques play a vital role to solve these problems. This paper proposed an internal control technique known as current based sliding mode control (SMC) for a filter less multilevel inverter (MLI). The aim of proposed research work is to achieve 27 level output voltage by using an inverter, which approaches sinusoidal wave without using any filters. To control the output of MLI, a current based SMC is implemented in order to achieve the robustness, a good dynamic response, a smaller number of voltage ripples and a smaller current THD. Moreover, a comparative analysis of SMC is done with the conventional PI controller. The response of the controller has been investigated for different cases e.g., introducing sag, swell, faults and harmonics in grid level has been implemented on MATLAB/Simulink. To validate the results of SMC for MLI, an experimental setup was also established which consists of National Instruments (NI) based hardware in loop (HIL) system and dSPACE 1202. The HIL system results show consistency with simulation results. INDEX TERMSFilter less, Hardware in loop (HIL), Multilevel Inverter (MLI), Sliding Mode Control (SMC), Total harmonic distortion (THD)

CHB multilevel inverter with sliding mode controller for DSTATCOM applications

“…𝑖 𝑑𝑔𝑟𝑒𝑓𝑖 and 𝑖 𝑞𝑔𝑟𝑒𝑓𝑖 can be found from (3). If the variations of the parameter of the Satcom, then the corresponding change in the system matrix is 𝛥𝐴 𝑖 , and the system can be represented as (17).…”

Nonlinear Impact of Topological Configuration of Coupled Inverter-Based Resources on Interaction Harmonics Levels of Power Flow

“…As an example of inverter control, in [6], a control strategy was put forth for designing sequence-asymmetric systems with the aim of locally correcting harmonic voltage issues. In [7], the authors present a technical idea that integrates a nearest-level controller with selective harmonic elimination control to improve the quality of the inverter's output terminal voltage while minimizing harmonic distortion; a new hybrid frame controller is introduced, where the synchronous frame is utilized for the adaptive harmonic compensatory in the grid-connected inverter [8]; in [9], the article proposes a novel filter, which effectively attenuates harmonics with small inductance for grid-connected inverters. Generally, control-based methods focus on active power sources by regulating the switching patterns of inverters.…”