MVDC multi-terminal grids: a valid support for distribution grids improvement

Clerici, Alessio; Chiumeo, R.; Gandolfi, Chiara

doi:10.23919/aeit50178.2020.9241183

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…Fig. 3(a) shows the response of both controls when tuned to achieve an equivalent damping (𝜁 = 0.7) for the 𝜔 7 → 𝑃 456 tfs (3)(4)(5)(6). Despite the equivalent tuning, the GFM droop control appears to be less damped than the Synchronverter.…”

Section: Dynamic Response Equivalencementioning

confidence: 99%

“…Voltage deviations resulting from the intermittent RESs and inflexible AC networks can also reduce the reliability of the power supply. Medium-voltage DC (MVDC) links are being proposed to solve these issues [4][5]. Traditional radial networks can be reinforced using the MVDC links, creating meshed hybrid AC-DC networks [4].…”

Section: Introductionmentioning

confidence: 99%

“…Traditional radial networks can be reinforced using the MVDC links, creating meshed hybrid AC-DC networks [4]. The MVDC links are interfaced by highly controllable converters that can achieve bi-directional flow and reactive power compensation and hence higher network utilisation [5]. MVDC is also fount be a cost-effective solution for offshore wind farms [6].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of droop and VSM equivalence considering the cascaded control dynamics

Harrison¹,

Henderson²,

Papadopoulos³

et al. 2021

IET Conf. Proc.

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Grid Forming (GFM) converters are changing the way that power converters interact with the network to resemble synchronous machines (SM). Several GFM technologies including the Synchronverter, a particular member of Virtual Synchronous Machine (VSM), and GFM droop, based on standard current control and droop, have been suggested. The controllers have been compared and found to be equivalent to each other in steady state. The equivalence generally focusses on individual operating conditions and fails to address differences in dynamic properties. This paper provides a clear tuning guide of both controls in terms of SM properties and a discussion of the analytical equivalence using the output of time-domain medium-voltage DC (MVDC) converter models. Initially, the GFM droop is found to be less damped despite the equivalent tuning in terms of damping ratio. A parametric sweep of the cascaded control present within the GFM droop finds that the Voltage Control bandwidth and proportional gain can be tuned to adjust the damping of the response. The Voltage Control parameters are also found to affect the GFM droop's stability.

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Section: Dynamic Response Equivalencementioning

confidence: 99%