SSR Analysis of DFIG-Based Wind Farm With VSM Control Strategy

The transition to renewable energy-based power systems is fast progressing. One of the main challenges in keeping a power system with high operational reliability is to maintain the system frequency. As synchronous generator units are being replaced with powerelectronic converters, the rotating mass and the system inertia are decreasing. Virtual synchronous machine (VSM) control is a modern control technique that aims to compensate for the reduction in inertia. The usage of power electronic-based converter units equipped with VSM control has to be managed and scheduled by system operators. An assessment of the operational frequency reliability is used to evaluate different service usages. A method is proposed that allows the comparison of different frequency management strategies. The proposed method uses fuzzy logic to evaluate the system risk for abnormal frequency and the system effort in the form of frequency control usage. This allows to quickly compare different frequency management strategies whilst keeping in mind many different reliability indices. The proposed method is validated with a modified IEEE Reliability Test System with integrated wind power capacity.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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“…

T_{a}

is the time constant that represents the time constant of the synchronous machine. The emulated time constant

T_{a}

is set to 5 s and the damping

k_{d}

is set to 50, as used in [40]. The possible active power change due to the enabled VSM service in the wind power plants is set to 0.2 pu.…”

Section: Case Studymentioning

confidence: 99%

Fuzzy‐based frequency security evaluation of wind‐integrated power systems

Steinkohl

Peyghami

Wang

et al. 2021

IET Energy Syst Integration

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“…The VSG developed in [45,46] can mitigate SSOs resulting from SSCI-CGI. However, the VSG developed for the MSC of a DFIG in [47], resulted in poorer performance compared to the vector control (VC). Based on the eigenvalue analysis of both control concepts, it was found that VC maintains stability for higher levels of series compensation and lower wind speeds.…”

Section: Virtual Synchronous Generatormentioning

confidence: 99%

“…Based on the eigenvalue analysis of both control concepts, it was found that VC maintains stability for higher levels of series compensation and lower wind speeds. This can be explained by the fact that rotor current transients are controlled by the MSC's current control, whereas its control in the proposed VSG is achieved only through a current limiter [47]. The latter inherently has a poorer transient performance.…”

Section: Virtual Synchronous Generatormentioning

confidence: 99%

Critical Review of Mitigation Solutions for SSO in Modern Transmission Grids

et al. 2020

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The replacement of conventional generation by power electronics-based generation changes the dynamic characteristics of the power system. This results in, among other things, the increased susceptibility to subsynchronous oscillations (SSO). First, this paper discusses three recently emerging SSO phenomena, which arise due to the interactions between (1) a doubly-fed induction generator and a series compensated transmission system; (2) a voltage source converter (VSC) and a weak grid; and (3) nearby VSCs. A fundamental review of these phenomena resulted in the requirement for a reclassification of the existing SSO phenomena. This reclassification is proposed in this work and is based on interacting components identified using participation factor analysis for the distinct phenomena. Second, a critical review of the existing mitigation measures is performed for these phenomena, highlighting the advantages and disadvantages of the solutions. The influence of the wind speed, grid strength, number of wind turbines, and several converter controller parameters are also discussed. To assist equipment manufacturers, control design engineers, and system operators in selecting and designing effective mitigation measures, the existing solutions are categorized in control solutions, hardware solutions, and solutions based on system level coordination. Finally, perspectives on open issues conclude this paper.

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“…Moreover, most researchers adopt various effective methods for investigating SSO, such as the impedance-based method [15], [16], the modal analysis method [17], [18], and the equivalent RLC circuit method [19], [20]; the equivalent RLC circuit method is a simpler and more straightforward approach compared to the other methods. We can easily take all control loops and parameters of the RSC into account when adopting this method.…”

Section: Introductionmentioning

confidence: 99%

Understanding Subsynchronous Oscillation in DFIG-Based Wind Farms With Rotor-Side Converter Control Based on the Equivalent RLC Model

et al. 2020

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This paper aims to reasonably demonstrate the role of the rotor-side converter (RSC) in subsynchronous oscillation (SSO) and investigates the influence and relationships of all control parameters. Thus, the equivalent circuit of a doubly fed induction generator (DFIG) that considers the RSC is imperative. First, the pertinent equivalent model of a DFIG with RSC control is established. Compared with previous works, this paper innovatively merges the RSC and induction generator with flux and voltage, obtains a complete analytical expression for the equivalent power supply and impedance containing all parameters of both the inner and outer loops of the RSC and then constructs a reasonable equivalent model. The action of the RSC is successfully demonstrated and reflects how the control loops and parameters of the RSC affect the circuit structures and properties of the equivalent model. Then, based on this proposed model, the influence mechanism of the RSC on the SSO of the grid-connected system is carefully analyzed.

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SSR Analysis of DFIG-Based Wind Farm With VSM Control Strategy

Cited by 14 publications

References 27 publications

Fuzzy‐based frequency security evaluation of wind‐integrated power systems

Fuzzy‐based frequency security evaluation of wind‐integrated power systems

Critical Review of Mitigation Solutions for SSO in Modern Transmission Grids

Understanding Subsynchronous Oscillation in DFIG-Based Wind Farms With Rotor-Side Converter Control Based on the Equivalent RLC Model

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