Modeling and Impedance Analysis of a Single DC Bus-Based Multiple-Source Multiple-Load Electrical Power System

Abstract

Gao, Fei and Bozhko, Serhiy (2016) 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-The impedance based stability assessment method has been widely used to assess the stability of interconnected systems in different application areas. This paper deals with the source/load impedance analysis of the droop-controlled multiple sources multiple loads system which is a promising candidate in the future more-electric aircraft (MEA). This paper develops a mathematical model of the PMSG-based variable frequency generation system, derives the output impedance of the source subsystem including converter dynamics and shows the effect of parameters variation on source impedance and load impedance. A dynamic droop controller is proposed to provide the active damping to the system. In addition, the impedance analysis is extended to a generalized single bus-based multiple sources multiple loads system in which power losses are also investigated. The aforementioned analytical result is confirmed by experimental results.

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

“…As illustrated by Figure 6, (this approach assumes a number of local distribution units that can be located close to loads with only high-voltage supply to these units. 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.…”

Control Design and Voltage Stability Analysis of a Droop-Controlled Electrical Power System for More Electric Aircraft

“…It is well-known that an increased power absorbed by CPLs will degrade the system stability [21], [22]. The effect of the control parameters was also discussed in [23]. Thus, this paper focuses on the impact of the number of parallel sources and different power sharing ratios between HP and LP sources on the source/load impedance and voltage stability.…”

“…This is because the global droop coefficient decreases with increasing the number of parallel sources, yielding less voltage drop at the main bus under the same load condition. As a consequence, the load impedance at the low frequency region will increase, as indicated from (23). Hence, the system stability is improved if parallel sources are working with the same individual droop coefficient (ki).…”

“…Nevertheless, the published works on the context of MEA EPS are mainly focused on the single source system, droop control is not used and the dynamics of the generator is not taken into account. In [23], stability of a single DC bus MEA EPS with multiple generators is investigated. However, the interaction of the parallel sources including the steady-state power sharing performance is not validated experimentally, and the impact on stability of different operating frequencies of the different sources is not addressed.…”

Modeling, analysis and voltage balancing for DC distribution networks

“…The model includes port capacitors of the converters, as well as the interconnection cables [122]. Extending from the DC bus system, a multiple source multiple load power system is investigated for stability analysis [123]. In reference [124], instead of a DC bus, it investigates on multi sources and loads at each node and with the effects of cable impedance.…”