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Today, coordinated expansion planning is one of the key challenges for electricity systems including active distribution networks (ADNs) and transmission networks (TNs) hosting distributed renewable generation as well as large‐scale wind energy generation. Accordingly, this study presents a decentralised hybrid robust and stochastic (HR&S) expansion planning optimisation method to determine a robust generation and transmission planning for a TN and stochastic expansion planning for ADNs. The proposed HR&S planning model is formulated with the objective of achieving an effective expansion of both TN&ADN while minimises the investment and operation costs of TN&ADN planning considering wind uncertainty in TNs and load uncertainty in ADNs. Finally, the IEEE 30‐bus test system has been analysed to show the effectiveness of the proposed TN&ADN expansion planning framework and decentralised solution strategy. © 2020 The Authors. Free Access.

In co-scheduling of the integrated electrical energy and natural gas systems with high penetration of renewable energy sources, it is vital to have flexible resources to handle uncertainties, viz., continuous wind uncertainty and discrete equipment failures. Accordingly, this paper evaluates the effectiveness of electrical grid flexibility, i.e., optimal grid reconfiguration (OGR), on the scheduling plan of both energy systems. Also, to characterize the continuous/discrete uncertainty sources, this paper aims to develop a new computationally-efficient hybrid stochastic/IGDT (HS-IGDT) optimization framework for the co-scheduling of electrical energy and natural gas systems. Finally, the IEEE Reliability Test System with ten-node gas transmission system have been analyzed to show the efficiency of the proposed framework.

Development of high specific power electrical machine is a key step in the journey toward more/all electric aircraft. Permanent magnet synchronous machines (PMSMs) are good candidates to achieve higher specific power and high efficiency. Progress in the development of advanced materials play a key role in enabling the future electrified aircrafts. Therefore, a novel dual-phase magnetic material (previously presented in literature) employed to design an interior permanent magnet synchronous machine (IPMSM). This paper discusses the performance comparison between dual phase magnetic material and conventional magnetic materials used for rotor laminations. Furthermore, this paper presents the design procedure of a 250kW high specific power IPMSM design, and its electromagnetic and mechanical analysis. Simulation results are included to demonstrate the proposed design’s performance and capabilities.

There has been an increasing demand for high specific power electric machines for hybrid/electric aerospace applications in the past few years. Among various types of electric machines, permanent magnet synchronous machines (PMSMs) are more capable of delivering higher specific power. This paper proposes a comparison among three different designs of Interior Permanent Magnet (IPM) machines with enabled by dual-phase magnetic material used for the rotor laminations. The design procedure is presented, and mechanical analysis performed to demonstrate that the proposed designs are within the acceptable stress constraints. Performance and specific power comparison between all proposed designs and their counterpart designs using conventional magnetic materials is presented. Electromagnetic and mechanical simulation results are included to demonstrate the proposed designs’ performance and capabilities.

Insulating materials and insulation systems design have been gaining more attentions as more electrical machines tend to operate in harsher environments for various applications. Harsh environments include high temperature, humidity, erosion, low air pressure, etc. This paper discusses recent advances in insulation systems for electrical machines. Insulation tests as well as test standards that have been used to evaluate insulation systems and detect insulation failures will be discussed. Insulating materials used for a wide range of industrial applications such as wind turbine generators, aerospace hybrid/electric powertrain, and hydro generators have been summarized. For the emerging high-altitude, highvoltage aerospace applications, partial discharge and its impact on insulation systems will be discussed. Finally, polymer nanocomposite materials with excellent thermal conductivity and dielectric strength are highlighted as an outlook.