Power Quality Improvement in Smart Distribution Grid Using Low-Cost Two-level Inverter DVR

Abstract

The smart grid (SG) is a new scientific progress concept. Residential and commercial colonies and smart homes have many sensitive electrical devices and renewable energy systems (solar and wind). SG is greatly affected by Power Quality (PQ) disturbances. PQ has significant impacts on the low voltage smart grid, such as flicker, voltage sag/swell, and harmonics, causing substantial losses and disrupting the SG system. The smart home resident needs a clean and reliable electric power energy source without any PQ troubles. Dynamic Voltage Restorer (DVR) is a costefficient and promising static var device installed in series with transmission and distribution lines to protect PQ disturbances in electrical power systems. This research introduces an idea to improve PQ disturbances in the smart distribution grid (smart home) at the low voltage side using a Low-Cost Two-level inverter DVR. This study will use a two-level inverter topology to integrate with the DVR System to obtain a simple and straightforward Low-Cost Two-level Inverter DVR approach that is easy to use, flexible, and practical. In this research, the proposed DVR was designed and simulated in MATLAB/Simulink, where it shows excellent performance to overcome PQ-related disturbances such as voltage sag/swell, flicker, and harmonics with percentages close to 99%.

A review on the state of the art of dynamic voltage restorer: topologies, operational modes, compensation methods, and control algorithms

“…For low-voltage (LV) grid applications, DVR topologies incorporating two-level power converters are often favored due to their switching approach. The use of twolevel power converters is prevalent in these cases, primarily due to their suitability and effectiveness in LV grid applications [82]. PWM (Pulse Width Modulation) is a basic technique that is less expensive than MLIs.…”

“…Due to the high voltages on switches, they cannot be utilized in Medium-Voltage (MV) grid applications, which is why electronic devices are often employed in medium voltage grid connections. Switches that linked in series or parallel are one solution to this problem [82]. Using MLIs, on the other hand, is a superior alternative.…”