A new method to assess the contribution of VSC-HVDC connected wind farms to the primary frequency control of power networks

Castro, Luis M.; Acha, E.

doi:10.1016/j.epsr.2017.08.011

Cited by 17 publications

(11 citation statements)

References 9 publications

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“…1, the relationship between the mechanical power of WT, P WT , the electrical conversion power after AC/DC/AC converter, P E_WT , the SG power, P SG and the power to charge or discharge the SC, P SC and load power. P L can be expressed as in (8). The ± defines the charging (−) and discharge (+) process of the SC.…”

Section: Sc-based Vismentioning

confidence: 99%

“…The development of VIS had been acknowledged in terms of its faster response time during a frequency event, limitless inertial support at all times, faster recovery time and reduction in the mechanical stress of the generator. Currently, rotating mass, DC-link capacitor [5][6][7][8] and energy storage (ES) are different types of VIS that have been widely implemented in wind energy conversion systems (WECS).…”

Section: Introductionmentioning

confidence: 99%

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Virtual inertial support extraction using a super‐capacitor for a wind‐PMSG application

Hasan

Rosmin

Nordin

et al. 2019

IET Renewable Power Generation

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The replacement of a conventional synchronous generator (SG) with higher wind penetration greatly reduces the inertial support available for the system. Therefore, a new consideration-the dynamic frequency changes in a wind energy system using a super-capacitor (SC)-is proposed here to provide faster, limitless, inertial response during load disturbances. By considering the dynamic frequency change in defining the power exchange between SC and network, this proposed method not only provides inertial and primary frequency response but is also able to avoid a second frequency dip. To avoid deep charge and discharge of SC, a simple energy management system (EMS) which considers the system frequency deviation and the state of charge (SOC) of SC is adopted in this technique. The effectiveness of the proposed technique is modelled in MATLAB/Simulink software. Comparative analyses between the proposed virtual inertial support (VIS)-based SC and existing VIS control strategies are performed. The simulation results obtained prove that the proposed VIS greatly reduces the frequency nadir and peak frequency of the system during sudden load increase and decrease, respectively.

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Section: Sc-based Vismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Virtual inertial support extraction using a super‐capacitor for a wind‐PMSG application

Hasan

Rosmin

Nordin

et al. 2019

IET Renewable Power Generation

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“…The general frame-of-reference is given by (see 18 above), with i = 1…m, j = 1…n, and k = 1…r, where the terms ΔP and the vectors of state variables θ take the form of (16) and 17depending on the type of converter and its corresponding AC network. Matrices B′, with subscripts Slack, Psch, and Pass, bear the structure shown in (19). The matrix G′ dc in (20) represents the conductance matrix of the DC network excluding all the conductances connecting to DC buses where voltage control is exerted by converters VSC Slack ; however, notice that these conductances are needed in matrix G′ Sdc .…”

Section: Generalised Hvdc Power Grid Model Containing Various Vsc Stamentioning

confidence: 99%

“…It should be noted that expression (18) indicates that, in the event of contingencies, there may be more than one slack VSC unit contributing to balance the powers in the AC/DC grid, a response that is assumed to be instantaneous which is validated through the study cases. However, if these VSC stations are to be implemented with a power droop control, then the corresponding injected powers Δ PAC si in (18) should be modified accordingly, in a similar way to the case when generation units are modelled with power/ speed droop controls [19].…”

Section: Generalised Hvdc Power Grid Model Containing Various Vsc Stamentioning

confidence: 99%

Efficient method for the real‐time contingency analysis of meshed HVDC power grids fed by VSC stations

Castro

Acha²,

Rodriguez-Rodrıguez

2018

IET Generation, Transmission & Distribution

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“…Fuzzy logic supervisor based primary frequency control of variable speed wind turbine is presented in [14]. A method using the voltage source converter based high voltage DC connected wind farms has been presented in [15] for primary control of frequency in power networks. In [5], the technique of operating variable speed wind turbine generator (DFIG) below maximum power point (deloading) has been studied to create a dynamic energy reserve margin to support primary frequency regulation in microgrids (MGs) during depressed frequency conditions.…”

Section: Introductionmentioning

confidence: 99%

Modified Deloading Strategy of Wind Turbine Generators for Primary Frequency Regulation in Micro-Grid

Kumar

Sharma

Mathur

et al. 2020

Technol Econ Smart Grids Sustain Energy

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In this work, the contribution of wind turbine generator (WTG) to support micro-grid (MG) during depressed frequency condition has been studied with a modified strategy for improving the primary load frequency response of MG. The majority of existing deloading techniques to estimate the reference power are based on the linear relationship. Hence they are not so accurate to mimic the actual speed versus power dynamics of turbine rotor during deloading operation which is inherently nonlinear in nature. In this work, the existing methods have been analyzed in detail with an aim to improve the performance. Based on the analysis a modified deloading method assuming non-linear relation between rotor speed and power of WTG system has been proposed which shows the improved load frequency response in MG. The proposed deloading technique is simulated and validated using real-time digital simulator (OP4510) for the variation in load and generation inside an islanded MG. The results obtained using modified deloading method are compared with existing deloading method and it is found that proposed deloading method handles the non-linearity of the system during deloading operation and also it contributes more power to MG in response to load demand at the cost of slight increase in the speed of turbine rotor.

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A new method to assess the contribution of VSC-HVDC connected wind farms to the primary frequency control of power networks

Cited by 17 publications

References 9 publications

Virtual inertial support extraction using a super‐capacitor for a wind‐PMSG application

Virtual inertial support extraction using a super‐capacitor for a wind‐PMSG application

Efficient method for the real‐time contingency analysis of meshed HVDC power grids fed by VSC stations

Modified Deloading Strategy of Wind Turbine Generators for Primary Frequency Regulation in Micro-Grid

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