Special Issue "HVDC for Grid Services in Electric Power Systems"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy".

Deadline for manuscript submissions: 31 December 2018

Special Issue Editor

Guest Editor
Prof. Dr. Gilsoo Jang

School of Electrical Engineering, Korea University, Seoul 136-713, Korea
Website | E-Mail
Interests: HVDC control; transient stability; HVDC system planning

Special Issue Information

Dear Colleagues,

We are inviting submissions of original research to a Special Issue of Applied Sciences on the subject of “HVDC for Grid Services in Electric Power Systems”.

The modern electric power system has evolved into a huge nonlinear complex system, due to the interconnection of thousands of generation and transmission systems. The unparalleled growth of renewable energy resources (RES) has caused significant concern regarding grid stability and power quality, and it is essential to find ways to control such a massive system for effective operation. The controllability of HVDC and FACTs devices allows for improvement of the dynamic behavior of grids and their flexibility. Research is being carried out at both the system and component levels of modelling, control, and stability. This Special Issue aims to present novel topologies or operation strategies to prevent abnormal grid conditions.

Prof. Dr. Gilsoo Jang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Control, operation and planning of HVDC Systems
  • Active control of HVDC systems
  • HVDC control for special protection systems
  • HVDC operation scheme for stability improvement
  • Intelligent strategies for HVDC voltage support
  • New control techniques in HVDC
  • New HVDC applications
  • HVDC protection schemes

Published Papers (3 papers)

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Research

Open AccessArticle Assessment of Appropriate MMC Topology Considering DC Fault Handling Performance of Fault Protection Devices
Appl. Sci. 2018, 8(10), 1834; https://doi.org/10.3390/app8101834
Received: 13 September 2018 / Revised: 28 September 2018 / Accepted: 2 October 2018 / Published: 6 October 2018
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Abstract
The eventual goal of high-voltage direct-voltage (HVDC) systems is to implement HVDC grids. The modular multilevel converter (MMC) has been identified as the best candidate for the realization of an HVDC grid by eliminating the shortcomings of conventional voltage source converter (VSC) technology.
[...] Read more.
The eventual goal of high-voltage direct-voltage (HVDC) systems is to implement HVDC grids. The modular multilevel converter (MMC) has been identified as the best candidate for the realization of an HVDC grid by eliminating the shortcomings of conventional voltage source converter (VSC) technology. The related research has focused on efficient control schemes, new MMC topologies, and operational characteristics of an MMC in a DC grid, but there is little understanding about the fault handling capability of two mainstream MMC topologies, i.e., half bridge (HB) and full bridge (FB) MMCs in combination with an adequate protection device. Contrary to the existing research where the fault location is usually fixed (center of the line), this paper considered a variable fault location on the DC line, so as to compare the fault interruption time and maximum fault current magnitude. From the point of view of fault interruption, AC and DC side transient analyses were performed for both MMC topologies to suggest the appropriate topology. The simulation result confirmed that the fault handling performance of an HB-MMC with a DC circuit breaker is superior due to the smaller fault current magnitude, faster interruption time, lower overvoltage magnitude, and lesser stresses on the insulation of the DC grid. Full article
(This article belongs to the Special Issue HVDC for Grid Services in Electric Power Systems)
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Open AccessArticle A Study on Stability Control of Grid Connected DC Distribution System Based on Second Order Generalized Integrator-Frequency Locked Loop (SOGI-FLL)
Appl. Sci. 2018, 8(8), 1387; https://doi.org/10.3390/app8081387
Received: 21 July 2018 / Revised: 13 August 2018 / Accepted: 13 August 2018 / Published: 16 August 2018
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Abstract
This paper studies a second order generalized integrator-frequency locked loop (SOGI-FLL) control scheme applicable for 3-phase alternating current/direct current (AC/DC) pulse width modulation (PWM) converters used in DC distribution systems. The 3-phase AC/DC PWM converter is the most important power conversion system of
[...] Read more.
This paper studies a second order generalized integrator-frequency locked loop (SOGI-FLL) control scheme applicable for 3-phase alternating current/direct current (AC/DC) pulse width modulation (PWM) converters used in DC distribution systems. The 3-phase AC/DC PWM converter is the most important power conversion system of DC distribution, since it can boost 380 Vrms 3-phase line-to-line AC voltage to 700 Vdc DC output with various DC load devices and grid voltages. The direct-quadrature (d-q) transformation, positive sequence voltage extraction, proportional integral (PI) voltage/current control, and phase locked loop (PLL) are necessary to control the 3-phase AC/DC PWM converter. Besides, a digital filter, such as low pass filter and all pass filter, are essential in the conventional synchronous reference frame-phase locked loop (SRF-PLL) method to eliminate the low order harmonics of input. However, they limit the bandwidth of the controller, which directly affects the output voltage and load of 3-phase AC/DC PWM converter when sever voltage fluctuation, such as sag, swell, etc. occurred in the grid. On the other hand, the proposed control method using SOGI-FLL is able to do phase angle detection, positive sequence voltage extraction, and harmonic filtering without additional digital filters, so that more stable and fast transient control is achieved in the DC distribution system. To verify the improvement of the characteristics in the unbalanced voltage and frequency fluctuation of the grid, a simulation and experiment are implemented with 50 kW 3-phase AC/DC PWM converter used in DC distribution. Full article
(This article belongs to the Special Issue HVDC for Grid Services in Electric Power Systems)
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Open AccessFeature PaperArticle Novel Transient Power Control Schemes for BTB VSCs to Improve Angle Stability
Appl. Sci. 2018, 8(8), 1350; https://doi.org/10.3390/app8081350
Received: 20 June 2018 / Revised: 7 August 2018 / Accepted: 8 August 2018 / Published: 11 August 2018
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Abstract
This paper proposes two novel power control strategies to improve the angle stability of generators using a Back-to-Back (BTB) system-based voltage source converter (VSC). The proposed power control strategies have two communication systems: a bus angle monitoring system and a special protection system
[...] Read more.
This paper proposes two novel power control strategies to improve the angle stability of generators using a Back-to-Back (BTB) system-based voltage source converter (VSC). The proposed power control strategies have two communication systems: a bus angle monitoring system and a special protection system (SPS), respectively. The first power control strategy can emulate the behaviour of the ac transmission to improve the angle stability while supporting the ac voltage at the primary level of the control structure. The second power control scheme uses an SPS signal to contribute stability to the power system under severe contingencies involving the other generators. The results for the proposed control scheme were validated using the PSS/E software package with a sub-module written in the Python language, and the simple assistant power control with two communication systems is shown to improve the angle stability. In conclusion, BTB VSCs can contribute their power control strategies to ac grid in addition to offering several existing advantages, which makes them applicable for use in the commensurate protection of large ac grid. Full article
(This article belongs to the Special Issue HVDC for Grid Services in Electric Power Systems)
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Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

(1)
Authors: 
Ho-Yun Lee, Mansoor Asif, Kyu-Hoon Park and Bang-Wook Lee
Type of Paper:
Article
Expected Submission Date:
End of August 2018
Title:
DC Fault Interruption Performance of Half-Bridge and Full-Bridge MMC based HVDC Systems according to the Fault Location
Abstract:
With the continuous improvement in modular voltage source converters (VSC) based HVDC technologies, the interest in the realization of high voltage direct current (HVDC) grids is significantly increasing. The modular multilevel converters (MMC) are based on either half bridge (HB) or full bridge (FB) submodules. These two MMC technologies show significantly different dc fault handling capabilities. The different characteristics directly affect the protection requirement of the HVDC grid. Due to reverse blocking capability of full bridge MMC, circuit breaker is not required as opposed to half bridge based MMC converters which are unable to control the fault current. In this study we have focused on comparison of peak fault current magnitude, fault current interruption duration and energy dissipation during fault in the two types of MMC-HVDC grids depending on the dc fault location. The results confirm that the HB submodule MMC scheme along with HCB has remarkably better fault interruption characteristics compared to Full Bridge MMC.

(2)
Authors: Dr. Kamati N.I.Mbangula and his group
Affiliation: Electrical Engineering Discipline, University of KwaZulu-Natal, Durban, 4001, South Africa

(3)
Authors: Dr. Monday Ikhide and his group
Affiliation: School of Energy, Construction and Environment, Coventry University, United Kingdom
Homepage: https://pureportal.coventry.ac.uk/en/persons/monday-ikhide

(4)
Authors: Dr. Gyusub Lee and his professor
Affiliation: Department of Electrical Engineering, Seoul National University, Seoul, Republic of Korea
Type of Paper: Article
Expected Submission Date: End of Decmber 2018
Title: The Frequency-Power Droop Coefficients Scheduling Method of Mixed LCC and VSC Multi-Infeed HVDC System for Loss Minimization of Islanded network
Abstract: Among the grid service applications of high-voltage direct-current (HVDC) system, frequency-power droop control for islanded network is widely used scheme. In this paper, a new frequency droop coefficients determination method for mixed line-commutated converter-based (LCC) and voltage-sourced converter-based (VSC) multi-infeed HVDC system is presented. The proposed method is designed for minimization of power loss which is caused by load imbalance. An interior-point method is used as optimization algorithm to implement the proposed scheduling method. Two test systems, modified IEEE 14-buses system and the Jeju island network in the South Korea, are utilized for MATLAB simulation case studies to suggest that the proposed method is effective to reduce power system loss during frequency control. Additionally, to demonstrate the steady-state model of LCC HVDC in terms of reactive power characteristic, simulation case study using PSCAD, which is electro-magnetic transient (EMT) based program, is performed.

(5)
Authors:
Prof. Mingdong Wang and his team
Affiliation:
School of Electrical Engineering, Zhengzhou University, Zhengzhou, China
Type of Paper:
Article
Expected Submission Date: Before 1 December 2018

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