Grid Supporting VSCs in Power Systems with Varying Inertia and Short-Circuit Capacity

Misyris, George S.; Mermet-Guyennet, Jeanne A.; Chatzivasileiadis, Spyros; Weckesser, Tilman

doi:10.1109/ptc.2019.8810979

Cited by 19 publications

(18 citation statements)

References 11 publications

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“…Error between the V PCC -X/R PCC graphs predicted by (11) and the reference curves presented in Figure 3 for IG-based WPP and X/R PCC > 2 (12) Func4 Coefficients of (12), i.e., Y l0 , Y l1 and Y l2…”

Section: Determining the Coefficients Values Using Gamentioning

confidence: 99%

“…A SCR greater than 20 signifies that the stability requirements of the grid codes have been satisfied [10]. At a given point of a distribution system, SCC is proportional to the square of the system nominal voltage and inverse of the magnitude of system short circuit impedance (Z sc ) seen at this point [11]. Generally, the wind velocity is high at sites located far from the distribution substation.…”

Section: Introductionmentioning

confidence: 99%

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Developing a Mathematical Model for Wind Power Plant Siting and Sizing in Distribution Networks

et al. 2020

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Wind Power Plants (WPPs) are generally located in remote areas with weak distribution connections. Hence, the value of Short Circuit Capacity (SCC), WPP size and the short circuit impedance angle ratio (X/R) are all very critical in the voltage stability of a distribution system connected WPP. This paper presents a new voltage stability model based on the mathematical relations between voltage, the level of wind power penetration, SCC and X/R at a given Point of Common Coupling (PCC) of a distribution network connected WPP. The proposed model introduces six equations based on the SCC and X/R values seen from a particular PCC point. The equations were developed for two common types of Wind Turbine Generators (WTGs), including: the Induction Generator (IG) and the Double Fed Induction Generator (DFIG). Taking advantage of the proposed equations, design engineers can predict how the steady-state PCC voltage will behave in response to different penetrations of IG- and DFIG-based WPPs. In addition, the proposed equations enable computing the maximum size of the WPP, ensuring grid code requirements at the given PCC without the need to carry out complex and time-consuming computational tasks or modelling of the system, which is a significant advantage over existing WPP sizing approaches.

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Section: Determining the Coefficients Values Using Gamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Developing a Mathematical Model for Wind Power Plant Siting and Sizing in Distribution Networks

et al. 2020

View full text Add to dashboard Cite

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“…In addition, the outer control loop is used to calculate the current reference i ‹ f P R 2 based on the mismatch between measured signals y s and prescribed setpoints u s " pp ‹ c , q ‹ c , ω ‹ s , V ‹ c q P R 4 . The most common PLL implementation is a so-called type-2 SRF PLL [25], which achieves synchronization by diminishing the q-component of the measured voltage v q f P R via PI control, thus aligning the d-axis of the Synchronously-rotating Reference Frame (SRF) with the output voltage vector v f [26]:…”

Section: Device Modelmentioning

confidence: 99%

Improving Stability of Low-Inertia Systems using Virtual Induction Machine Synchronization for Grid-Following Converters

Stanojev¹,

Markovic²,

Aristidou³

et al. 2021

Preprint

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This paper presents a novel strategy for synchronization of grid-connected Voltage Source Converters (VSCs) in power systems with low rotational inertia. The proposed model is based on emulating the physical properties of an induction machine and capitalizes on its inherent grid-friendly properties such as self-synchronization, oscillation damping and standalone capabilities. A detailed mathematical model of an induction machine is derived, which includes the possibility of obtaining the unknown grid frequency by processing the voltage and current measurements at the converter output. This eliminates the need for the phase-locked loop unit, traditionally employed in grid-following VSC control schemes, while simultaneously preserving the applied system-level and device-level control. Furthermore, the appropriate steps for obtaining an index-1 DAE representation of the induction-machine-based synchronization unit within the VSC control scheme are provided. The EMT simulations validate the mathematical principles of the proposed model, whereas a small-signal analysis provides guidelines for appropriate control tuning and reveals interesting properties pertaining to the nature of the underlying operation mode.

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“…To analyse the effect of VSDR control on grid frequency, the grid equivalent is implemented according to the authors in [36, 37] and detailed below. Besides providing the voltage input to the PLL, the major purpose of grid equivalent is to capture the electromechanical dynamics of the centre‐of‐inertia frequency after a disturbance.…”

Section: Vsdr Control Schemementioning

confidence: 99%

Modelling of variable‐speed refrigeration for fast‐frequency control in low‐inertia systems

et al. 2020

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In modern power systems, shiftable loads contribute to the flexibility needed to increase robustness and ensure security. Thermal loads are among the most promising candidates for providing such service due to the large thermal storage time constants. This study demonstrates the use of variable-speed refrigeration (VSR) technology, based on brushless DC motors, for the fast-frequency response. First, the authors derive a detailed dynamic model of a single-phase VSR unit suitable for time-domain and small-signal stability analysis in low-inertia systems. For analysing dynamic interactions with the grid, they consider the aggregated response of multiple devices. However, the high computational cost involved in analysing large-scale systems leads to the need for reduced-order models. Thus, a set of reduced-order models is derived through transfer function fitting of data obtained from time-domain simulations of the detailed model. The modelling requirements and the accuracy versus computational complexity trade-off are discussed. Finally, the time-domain performance and frequency-domain analyses reveal substantial equivalence between the full-and suitable reduced-order models, allowing the application of simplified models in large-scale system studies.

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Grid Supporting VSCs in Power Systems with Varying Inertia and Short-Circuit Capacity

Cited by 19 publications

References 11 publications

Developing a Mathematical Model for Wind Power Plant Siting and Sizing in Distribution Networks

Developing a Mathematical Model for Wind Power Plant Siting and Sizing in Distribution Networks

Improving Stability of Low-Inertia Systems using Virtual Induction Machine Synchronization for Grid-Following Converters

Modelling of variable‐speed refrigeration for fast‐frequency control in low‐inertia systems

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