The Conducted Emission Attenuation of Micro-Inverters for Nanogrid Systems

Abstract

Road lighting systems require a significant amount of electric energy. To compensate for the utilized energy, the concept of a nanogrid road lighting system is presented. A solar panel is installed on the top of a lighting pole to generate electric power. In this research, a photovoltaic simulator (PV simulator), which is used to simulate solar behavior such as current, voltage, and power based on temperature and solar irradiance levels, is employed to replace a solar panel. In the nanogrid system, grid-connected and stand-alone micro-inverters are employed to convert the electric power. The inverters comprise switching devices that can generate electromagnetic interference (EMI) when operating, which is harmful to the grid system and the electrical equipment. In general, EMI has been studied and reduced in electrical appliances, which only receive electric power. However, for the nanogrid system, which supplies electricity to the grid system, there is less study on the EMI topic because the usage is still not widespread. In the future, the nanogrid system will be widely used delivering high power directly into the electrical grid system. Therefore, the study and attenuation of EMI in the nanogrid system are very promising. Conducted emission (CE) is one form of EMI that flows through a cable connecting several appliances in the frequency range of 150 kHz to 30 MHz. CE of grid-connected and stand-alone micro-inverters have high levels in the low-frequency range between 150 kHz–5 MHz and then decreases steadily. CE attenuation is important for this inverter in a solar power system. This research studies the effect of CE mitigation on the nanogrid system. The result is compared with the Comité International Spécial des Perturbations Radio (CISPR) 14-1 standard. Finally, the passive EMI filter can reduce CE and meets the CISPR 14-1 standard.

Enhanced Impedance Measurement to Predict Electromagnetic Interference Attenuation Provided by EMI Filters in Systems with AC/DC Converters

“…However, their design is usually optimized for one of the two scopes. Monitor probes have a high number of turns N probe in order to reduce the loading impedance (50/N 2 probe Ω) on the clamped cable, which would perturb the circuit under test. Conversely, BCI probes usually have a very low N probe to be effective in inducing a longitudinal voltage source onto the clamped cable.…”

“…Due to the widespread integration of renewable energy facilities, electromagnetic interference (EMI) issues are significantly growing in both AC and DC power systems [1,2]. Specifically, electromagnetic disturbances from power electronics converters that interface renewable energy sources to the power grid propagate along lines and metallic earthreturn structures [3,4].…”

Photovoltaic Power

“…Finally, from the point of view of new applications and upright ideas that can be carried out thanks to PV power systems, in this Special Issue has published papers related to the pumping in urban water pressurized networks, nano-grids to road lighting systems, charging of electric vehicles, and virtual power plants (Contributions [14][15][16][17]. All the contributions in this collection of articles consider solutions to current problems that are worth revising.…”

Three-Phase Modal Noise Analysis and Optimal Three-Phase Power Line Filter Design

“…Other works [1][2][3][31][32][33][34][35] have focused on evaluating how the modal CE contributes to increase the power grid pollution. Although a comprehensive analysis is proposed on the effects that CE noise have on the system, no specific details on how a PLF can be designed are presented.…”