A control strategy for a multi-terminal HVDC network integrating wind farms to the AC grid

Khenar, Mohammad; Adabi, Jafar; Pouresmaeil, Edris; Gholamian, S. Asghar; Catalão, João P.S.

doi:10.1016/j.ijepes.2017.01.025

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…R ln (n = 1, 2) is expressed as line resistance and L ln (n = 1, 2) is expressed as line reactance. The DG3 adopts the rectifier controller [25], and it is a good method to get the reference voltage through maximum power point tracking (MPPT) [26].…”

Section: Stability Analysis and Experimentsmentioning

confidence: 99%

VSG Control Strategy Incorporating Voltage Inertia and Virtual Impedance for Microgrids

Dai

Peng

et al. 2020

Energies

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Virtual synchronous generator (VSG) control lacks voltage inertia and powerful decoupling capabilities. The voltage of the distributed generator (DG) unit controlled by the VSG will be easily affected by power fluctuations and high-frequency noise, and the DG coupling usually makes the VSG control effect unsatisfactory. In order to effectively reduce power fluctuations, the influence of high-frequency noise on voltage, the influence of coupling on the power regulation, and effectively improve the economy of the economic system, the improved VSG control that combines voltage inertia and virtual impedance is proposed in this paper. The second-order inertia in the proposed VSG control strategy can minimize the voltage change rate and filter high-frequency noise from the excitation and virtual impedance. The virtual impedance in the proposed VSG control strategy can simulate the actual impedance to change the line characteristics, so the coupling of the DG unit can be reduced. Experimental results based on the microgrid platform prove the feasibility of improving the VSG control.

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Section: Stability Analysis and Experimentsmentioning

confidence: 99%

VSG Control Strategy Incorporating Voltage Inertia and Virtual Impedance for Microgrids

Dai

Peng

et al. 2020

Energies

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“…E NSURING a high share of renewable energy sources is an important step towards more sustainable power systems [1]. Yet, integration of renewables introduces a number of technical challenges, including those related to system stability [2]- [5]. Particularly prone are the events on the electromechanical timescale due to a direct influence of renewables on the frequency stability.…”

Section: Introductionmentioning

confidence: 99%

Supplementary Power Control of an HVDC System and Its Impact on Electromechanical Dynamics

Obradović

Oluic

Eriksson

et al. 2021

IEEE Trans. Power Syst.

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This paper presents a comprehensive analysis of the impact that supplementary power control of an HVDC link has on the electromechanical dynamics of power systems. The presented work addresses an interesting phenomenon that may occur when an HVDC power controller is installed to support frequency stability. In specific cases, a high gain HVDC frequency controller could deteriorate system damping. The given analytical study is the first of its kind that addresses this issue by including both: (i) the important higher-order generator dynamics that affect small signal stability simultaneously with an HVDC control as well as (ii) the available local angle/frequency input signals of the controller. The methodological approach here analytically formulates the impact an HVDC control has on the single generator dynamics. Furthermore, the relationship between the damping/synchronizing coefficients and the HVDC gain is explicitly derived when a frequency proportional HVDC controller is installed. The derived expressions confirm that, indeed, there is an optimal HVDC gain with respect to the damping coefficient and a typically positive impact of the HVDC controller on the synchronizing component. Finally, the developed theoretical foundation is demonstrated by the tools of linear and nonlinear analysis in a one-machine system case study.

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“…An attractive solution for the transferring of this bulk power from a location far away from shore is the voltage source converter based high voltage direct current (VSC-HVDC) system with the purpose of reducing losses and costs. In [13] is shown the method of collecting wind power with multi-terminal HVDC-VSC.…”

Section: Introductionmentioning

confidence: 99%

Load-frequency control in a multi-source power system connected to wind farms through multi terminal HVDC systems

Tavakoli

Pouresmaeil

Adabi

et al. 2018

Computers & Operations Research

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This paper addresses the wind farm contribution in frequency control during the integration in the power grid. In the proposed model, the wind farm utilizes inertia control and droop control techniques with the purpose of improving the frequency regulation. In order to achieve optimal results, all the parameters of the controllers for the different units in the power grid are obtained by using a particle swarm optimization algorithm (PSO) and by introducing a modified objective function instead of a conventional objective function e.g., Integral Time-weighted Absolute Error (ITAE). Also, different constraints such as reheat turbine, time delay, governor dead band and generation rate constraint (GRC) are considered for thermal and hydro units with the aim of studying a more realistic power system, which is the main contribution of this paper when compared to the other works in this field. It is shown that, in case of a perturbation in power demand, the system frequency will recover quickly and effectively in comparison with the traditional approaches. In addition, a sensitivity test is carried out in a single power grid area in order to examine the effectiveness of the proposed approach. Then, the system is extended to a multi-area power system using a multi-terminal HVDC for further investigation of the suggested strategy. Simulation results are presented in order to assess the performance of the proposed approach in the power system.

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A control strategy for a multi-terminal HVDC network integrating wind farms to the AC grid

Cited by 12 publications

References 22 publications

VSG Control Strategy Incorporating Voltage Inertia and Virtual Impedance for Microgrids

VSG Control Strategy Incorporating Voltage Inertia and Virtual Impedance for Microgrids

Supplementary Power Control of an HVDC System and Its Impact on Electromechanical Dynamics

Load-frequency control in a multi-source power system connected to wind farms through multi terminal HVDC systems

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