Black-Box Modelling of Low-Switching-Frequency Power Inverters for EMC Analyses in Renewable Power Systems

et al. 2022

Chin. J. Electr. Eng.

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The development of renewable energy systems interfaced with the grid by power electronic converters leads to increasing issues of electromagnetic coexistence between power and communication lines, as well as severe power quality issues, such as total harmonic distortion at the consumer side. Therefore, high-frequency modeling of renewable energy systems is of great importance to guide the design and development of distribution networks involving renewable sources. Owing to system complexity, black-box modeling approaches offer more advantages than traditional circuit modeling, as far as electromagnetic compatibility (EMC) analysis and filter design are the targets. In this study, different black-box modeling techniques for power converters are introduced and systematically analyzed. First, the general theory of black-box modeling is explained. Subsequently, three different modeling approaches are compared in terms of accuracy and the required experimental setup. Finally, the possible limitations of black-box modeling of power converters are investigated and discussed.

Section: Methodsmentioning

confidence: 99%

Section: Non-invasive Methodsmentioning

confidence: 99%

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Black-box Modeling of Converters in Renewable Energy Systems for EMC Assessment: Overview and Discussion of Available Models

et al. 2022

Chin. J. Electr. Eng.

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“…More specifically, an equivalent behavioural model is used to represent every PV unit, including the PV panels, the inverter, and the LCL filter. A detailed description of the methodology adopted to extract the parameters of such a black-box representation of the PV unit can be found in [9].…”

Section: B Component Modellingmentioning

confidence: 99%

Cable Effects on Noise Propagation in Distribution Networks with Renewable Sources

2022 20th International Conference on Harmonics &Amp; Quality of Power (ICHQP)

et al. 2022

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The development of power electronics for the integration of renewable energy sources in power distribution networks leads to increasing issues in terms of coexistence with communication systems, e.g., those based on powerline communications. This is due to the high-frequency noise currents, conducted emissions (CE), which, generated by power electronics devices, can propagate along the network through power cables. With the objective to provide guidelines to assure coexistence with communications systems, in this work a LV/MV distribution network is modelled and simulated in the frequency domain to predict the noise in different branches and to identify the factors that mostly affect CE propagation. The analysis mainly focuses on the effects due to power cables, and puts in evidence the need for their accurate modelling through transmission line theory in order to account for different cable features, such as per-unit-length parameters, cable length, and terminal conditions, which influence CE propagation.

“…The first objective of this paper is to build an unterminated EMI model of a PV-inverter system. To this end, the previous work of black-box modelling procedures at the ac side of power inverters in [11] is extended for an unterminated model to predict CE on both the ac and dc side, whose modeling procedures can overcome the aforesaid limitations in data post-processing. Another objective is to identify suitable conditions for applying the black-box modelling effectively with different modulation strategies.…”

Section: Introductionmentioning

confidence: 99%

Un-terminated Black-Box EMI Models of Power Converters Driven by Random Modulation Strategies

2022 International Symposium on Electromagnetic Compatibility – EMC Europe

et al. 2022

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Due to the development of renewable energy systems, there is an increasing need for tools to predict the Conducted Emissions (CE) exiting from power inverters, so to provide guidelines for optimal filter design. The objective is not only to limit the high-frequency noise injected into the distribution network (ac side) but also to protect the electronic circuitry on the dc side of the inverter. Hence, it is necessary to derive Electromagnetic Interference (EMI) models of the power inverter at both sides of the device. To this end, the (ac-side) behavioral model presented in previous works is here extended to predict the CE exiting both sides of a power inverter interfacing a PV panel to the distribution grid. Besides, suitable conditions for applying black-box modelling in the presence of random modulation strategies are investigated. It is proven that model effectiveness mainly depends on the base switching frequency and frequency band, while the effect of randomness does not significantly degrade prediction accuracy.