Sizing of power electronics EMC filters using design by optimization methodology

et al. 2021

IET Power Electronics

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In modern power systems, the proliferation of power electronics converters, and distributed generation raises important issues concerning inter‐connected switching units in terms of performance, stability and robustness. Such phenomenon are more prominent in micro‐grids, such as modern local low voltage distribution systems, more electric aircraft power systems etc., where many power converters are connected to the same non‐stiff low power ac grid, and strongly interact with each other. Locally designed converter control systems on the same electrical bus exhibit interactive behaviour. If not taken properly into account, external disturbances to the system at given operating conditions may result in the degradation of performance, failure to meet operating conditions and, in some cases, instability. This paper presents a new approach to synthesise converter controllers in more electric aircraft ac distribution grids (which is, however, applicable to all power electronics embedded systems), keeping in consideration dynamic interactions among subsystems. An optimal control design approach based on H2 optimisation is therefore proposed. Phase‐locked loops have also been considered, and their tuning has been included in the general tuning procedure of the whole system. Simulation, and experimental results show good improvements in terms of dynamic performance, and interaction mitigation.

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Section: Implementation Of the Controllermentioning

confidence: 99%

“…In this study, the state measurement matrix C 2 is set to be an identity matrix since all states are directly measurable. Let us assume to adopt a full state feedback control approach as described in Equation (11). In addition, let us consider the following assumptions:…”

Section: H 2 Synthesis and Controller Designmentioning

confidence: 99%

Optimal and automated decentralised converter control design in more electrical aircraft power electronics embedded grids

et al. 2021

IET Power Electronics

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“…By similar approach to previous subsection, the state equations in (2) for the AFE can be developed.…”

Section: B Afe Model: Resistive Loadmentioning

confidence: 99%

“…These embedded grids system are generally comprised of many power electronic converters interconnected together along with their associated input and output filters. One of the aims in MEA is to reduce the total weight and size of these systems, where 25% -40% of the total weight is comprised of the filters themselves [2], where reduction in filter size and weight by optimisation is a priority [3]. This reduction in filter and overall grid size tends to make the interaction between interconnected converter no longer negligible which leads to undesirable and often unstable behaviour.…”

Section: Introductionmentioning

confidence: 99%

Automated and scalable optimal control of three-phase embedded power grids including PLL

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

Zanchetta³

2017

Embedded grids have been increasingly adopted into applications such as More Electric Aircraft where different power converters are interconnected to each other. Interactions between the grid components poses the risk of instability to the system, more so when in the presence of reduced passive filters. An approach of automated and scalable tuning of such embedded grids with consideration for the dynamics introduced by a PLL is presented in this paper. A structured state feedback optimal control approach is proposed which enables a controller to be synthesised is such a way that maximum performance of the grid can be achieved, whilst guaranteeing power converter synchronisation to the grid, and avoiding instability due to converter interaction, and PLL dynamics.

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“…Generally, these power electronic networks consist of power converters which have filters interfaced between one another. These filters can contribute upwards of 25-40% of the total weight of the electrical system [8]. Therefore, in the case of aircraft, where the reduction in weight of the electrical system is of paramount importance, filters are generally reduced in size.…”

Section: Introductionmentioning

confidence: 99%

Decentralised Optimal Controller Design of Variable Frequency Three-Phase Power Electronic Networks Accounting for Sub-System Interactions

Rohten

IEEE Open J. Ind. Applicat.

et al. 2020