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Energies
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Interfacing of Power Electronics in Converter Dominated Grids
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Interfacing of Power Electronics in Converter Dominated Grids

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A1: Smart Grids and Microgrids".

Deadline for manuscript submissions: closed (10 September 2019) | Viewed by 6022

Special Issue Editor

Prof. Dr. Terence O'Donnell

E-Mail Website
Guest Editor
School Of Electrical & Electronic Engineering, University College Dublin, Belfield, Dublin 4, Ireland
Interests: power electronics; virtual synchronous machine control; power electronics dominated power systems; distributed energy resources; power electronics transformers; low frequency ac transmission; power hardware in the loop testing; magnetic components

Special Issue Information

Dear Colleagues,

Motivated by decarbonisation policies, the electrical grid is experiencing a growing penetration of generation from variable renewable sources, as well as a consequent displacement of conventional generation. These renewable sources are typically interfaced to the grid through power electronics converters, and although modern converters can provide frequency and voltage support, they currently only assume a grid feeding and supporting role. As penetrations grow, converter dominated grids could potentially have significantly different dynamic characteristics and operation requirements compared with the conventional synchronous machine dominated system.

This Special Issue seeks contributions that address how power electronics converter controls can provide solutions for maintaining power system stability and reliability, as we move towards converter dominated grids. We would welcome contributions that explore the performance of grid forming controls, controls for the interfacing of distributed energy resources or power electronics transformers, and for power electronics interfaced loads. Contributions that address the mitigation of issues associated with harmonics and stability are also welcome.

Prof. Dr. Terence O'Donnell
Guest Editor

Manuscript Submission Information

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Keywords

  • power electronics
  • grid forming
  • smart inverter
  • virtual inertia
  • droop control
  • virtual synchronous machine

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Published Papers (2 papers)

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Research

26 pages, 8714 KiB  
Article
An Enhanced Two-Stage Grid-Connected Linear Parameter Varying Photovoltaic System Model for Frequency Support Strategy Evaluation
by Colin Levis, Cathal O’Loughlin, Terence O’Donnell and Martin Hill
Energies 2019, 12(24), 4739; https://doi.org/10.3390/en12244739 - 12 Dec 2019
Cited by 1 | Viewed by 2656
Abstract
Securing a future sustainable decarbonised economy involves moving towards a system with rising penetration levels of distributed photovoltaics (PVs) within the low voltage distribution network (LVDN). This power system evolution is displacing conventional generators and has resulted in a decline in inertia that [...] Read more.
Securing a future sustainable decarbonised economy involves moving towards a system with rising penetration levels of distributed photovoltaics (PVs) within the low voltage distribution network (LVDN). This power system evolution is displacing conventional generators and has resulted in a decline in inertia that is essential for frequency stability. Emerging network codes require PV generators to maintain a scheduled curtailed active power (CAP) reserve for under-frequency contingencies. In this paper, the development, verification and application of an enhanced, two-stage grid-connected, state-space, linear parameter varying (LPV) PV system model is presented. The LPV model provides accurate and efficient modelling for PV systems over the wide range of operating points associated with curtailed active power and is suitable for power systems with large numbers of distributed PV systems capable of frequency support in the LVDN, to be simulated within reasonable simulation times. In addition, the LPV model can be used to investigate voltage rise due to reverse active power. The model performance is evaluated using recorded experimental data with step changes in irradiation and active power curtailment. The measured data is generated from a power hardware in the loop (PHIL) testbed. The model’s performance is investigated on an adapted radial European LVDN benchmark with several distributed PV systems to present some of the challenges, opportunities and benefits. Step changes in solar irradiation are used to evaluate the dynamic behaviour of the LPV model compared to a discrete-time electromagnetic transient (EMT) model. A frequency droop control characteristic for frequency support is demonstrated. The results show a computational burden reduction of 132:1 compared to the EMT model and demonstrate the voltage rise due to reverse active power from providing frequency support during under-frequency contingencies. Full article
(This article belongs to the Special Issue Interfacing of Power Electronics in Converter Dominated Grids)
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19 pages, 4710 KiB  
Article
Stabilization Method Considering Disturbance Mitigation for DC Microgrids with Constant Power Loads
by Haolan Liang, Zhangjie Liu and Hua Liu
Energies 2019, 12(5), 873; https://doi.org/10.3390/en12050873 - 6 Mar 2019
Cited by 10 | Viewed by 2927
Abstract
In this paper, the stability of direct current (DC) microgrids with a constant power load (CPL) and a non-ideal source is investigated. The CPL’s negative impedance will destabilize the system, and disturbances in the non-ideal source will degrade the load voltage quality. In [...] Read more.
In this paper, the stability of direct current (DC) microgrids with a constant power load (CPL) and a non-ideal source is investigated. The CPL’s negative impedance will destabilize the system, and disturbances in the non-ideal source will degrade the load voltage quality. In this study, we aim to: (1) overcome the instability of the CPL; (2) mitigate disturbances from the non-ideal source; (3) prevent the discontinuous harmonic current of high-frequency switching regulator from interfering with the source. Then, a stabilization method based on active damping which can achieve the above three objectives simultaneously is proposed. To obtain the stability conditions, the small-signal model of the system near the high-voltage equilibrium is established. Then, stability conditions are derived by eigenvalue analysis, and the domain of attraction near equilibrium is also obtained using the quadratic Lyapunov function. For the second objective, the key is to choose the optimal parameters to achieve disturbance attenuation. For the third objective, the active damper can separate the source from the switching regulator, which can prevent the discontinuous harmonic current. Moreover, the proposed method can be extended to multiple cases, and simulation results verify the effectiveness of the proposed method. Full article
(This article belongs to the Special Issue Interfacing of Power Electronics in Converter Dominated Grids)
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