System-Level Design for Reliability and Maintenance Scheduling in Modern Power Electronic-Based Power Systems

2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

2021

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This paper introduces a systematic approach based on the V-shaped model-based reliability analysis for design and planning of power electronic-based power systems (PEPS). According to this concept, the system performance is analyzed employing the physics of failure mechanisms in each components of different units in PEPS. This will facilitate optimal and economic design of power converters as well as economic decision-making in planning of PEPS. Moreover, it helps to identify the weakest units and its components that can in turn help in reinforcement planning and spare unit optimization in PEPS. The viability of the proposed approach is illustrated on a DC distribution network and numerical analyses show how the proposed model-based reliability assessment approach can help to do optimal planning and design of future PEPS. I. IntroductionGreen transition has gained increasing interest recently from policy makers all over the world and electrification is one of the pragmatic and efficient approaches to make greener society of the future. New and advanced green technologies are introduced in different energy sectors for different applications. The most important ones are electronic transmission systems, e-transportation, renewable generations, smart homes, and power-to-gas [1]. Thus, the future energy systems are becoming interconnected and dependent on electric power networks. Furthermore, most of the above-mentioned technologies require power electronic converters for energy conversion, thus making power networks more power electronic based power systems (PEPS). As a result, the performance of the energy systems depends on the short-and long-term characteristics of power converters due to the fact that the converters are vulnerable systems [2]-[10].According to the filed experience, power converters can affect the power systems performance [2], [11], [12]. Depending on the design and control characteristics of the converters, they can enhance or deteriorate the power system performance. Their characteristics are divided into short-term mainly associated with their control and longterm mainly associated with their lifetime and thereby their failures. Control-oriented characteristics can help interoperability of power grids with proper voltage and frequency support. Moreover, it can deteriorate the power grid performance by inducing stability issues. On the other hand, their long-term characteristics are affected by different stressors such as mission profiles, thermal cycling, humidity and vibration, thus casing wear-out failures, which are in turn limiting the end of life of converters. This will affect the power delivery performance in PEPS. The main focus of this paper is on the long-term performance of the PEPS.There are several solutions to guarantee the desired long-term performance of the PEPS. These solutions are performed at different levels attributed to the characteristics of devices, converters and the power system [13], [14].

Section: B Reliability Enhancement and Re-designmentioning

confidence: 99%

Reliability of Modern Power Electronic-based Power Systems

2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

2021

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“…In these methods, the mission profile is considered and the converter end of life is predicted using physics of failure analysis. In [8], in order to model the impact of converters on power system reliability, the converter availability modeling considering the physics of failures is introduced.…”

Section: Introductionmentioning

confidence: 99%

“…According to this concept, different factors such as components lifetime, thermal design, cooling system, switching frequency, control algorithms are taken into account to ensure the desired reliability of the converter. The design for reliability concept is further extended to power electronicbased power systems for planning and maintenance scheduling purposes by a model-based V-shape reliability assessment technique [8].…”

Section: Introductionmentioning

confidence: 99%

Reliability Modeling and Assessment of De-rated Redundant Power Converters

Abarzadeh²,

2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)

2022

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This paper proposes a reliability modeling approach and a reliability measure for redundant power converters with the possibility of de-rated operation. The proposed model takes into account the operating condition and its impact on the converter failure rate. Furthermore, the proposed reliability index is based on an availability measure, hence incorporating the impact of maintenance on the converter performance. However, the conventional reliability modeling approaches rely on either the probability of failure or availability based on the average failure rate. As a result, the proposed method introduces more accurate and realistic reliability performance. The proposed model is applicable for reliability assessment in power electronics systems for expert decision-making in asset management. The proposed approach is examined using a multi-level converter and a proper control system is proposed to operate the converter under de-rated operating conditions. The numerical analysis shows the proficiency of the proposed reliability modeling approach.

“…As a result, an accurate reliability model can be achieved, which in turn facilitates optimal design in a hierarchy from device up to system level. General concept of model-based design for reliability is introduced by the authors in [14] for modern power electronics-based power systems.…”

Section: Introductionmentioning

confidence: 99%

Model-based Reliability-Centered Design of Power Electronics Dominated Microgrids

2022 17th International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)

Fotuhi-Firuzabad

2022

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This paper proposes a model-based design approach for microgrids considering the aging of power electronic devices under different operating conditions. The proposed approach takes into account the physics of failure mechanisms in converter components as the failure prone devices in power systems. Furthermore, it considers the impacts of load profile on the aging of converter components and system performance. This approach facilitates accurate and optimized design of power electronic-based microgrids. According to this approach fragile links of power converters for a specified application can be identified. Moreover, the weakest converters based on their function in the microgrid can be recognized. As a result, economic decision making within design and planning of microgrids can be achieved.Index-aging, availability, design for reliability, microgrid, power converter.