An Improved Voltage Compensation Approach in A Droop-Controlled DC Power System for the More Electric Aircraft

Abstract

A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk 1 Abstract-This paper proposes an improved voltage regulation method in multi-source based DC electrical power system in the more electric aircraft. The proposed approach, which can be used in terrestrial DC microgrids as well, effectively improves the load sharing accuracy under high droop gain circumstance with consideration of cable impedance. Since no extra communication line and controllers are required, it is easily implemented and also increases the system modularity and reliability. By using the proposed approach the DC transmission losses can be reduced and system stability is not deteriorated for normal and fault scenarios. In this paper optimal droop gain settings are investigated and the selection of individual droop gains as well as the proportional power sharing ratio has been described. Experimental results validate the effectiveness of the proposed method.Index Terms-DC power system, droop control, load sharing, voltage deviation, transmission losses.

On-Board Microgrids for the More Electric Aircraft—Technology Review

“…Another trend in MEA EPS development considers so-called "single-bus" concept according to which the entire EPS, or its large sections, has a single bus to interface all the loads and all sources [33], [34] (could be of different types and/or physical nature) as illustrated by Figure 7 This topology become possible due to introduction of primary sources controlled by active PECs as discussed above. The key potential benefits include ease of establishing the most optimal power allocations using decentralized droop control [35], [36], hence reduction of design ratings for main sources leading to substantial weight reduction. Whilst the control principles for this topology to ensure compliance with power quality requirements are investigated and reported in abovementioned references, the fault protection strategies within this architecture is the key challenge that yet need to be addressed.…”

Comparative Stability Analysis of Droop Control Approaches in Voltage-Source-Converter-Based DC Microgrids

“…C 1 -C n correspond to the local converter output capacitors (local buses) and C b is a common capacitor bank installed on the main 270V DC bus. This architecture is based on a potential DC power system in future more electric aircraft [38] which can be considered as a challenging case of DC MGs in islanding mode. Typical loads in the system consist of tightly controlled DC/DC converters, motor drives and resistive loads.…”

Primary and secondary control in DC microgrids: a review

“…In [77], a feedforward term is added to the terminal voltage reference for each module Similar to the droop characteristic of each individual module at the DC terminal, the DC bus voltage and total load current also follows a droop characteristic. Only the load current needs to be measured and no additional DC voltage controller is in need.…”