Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System

He, Chengbing; Dakang, Sun; Song, Lei; Ма, Ли

doi:10.3390/en12173282

Cited by 10 publications

(6 citation statements)

References 10 publications

(14 reference statements)

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“…This means that undesired interactions among MMC1 and the electro-mechanical dynamics of synchronous generators and condensers can arise. These interactions are known as sub-synchronous oscillations (SSO) and are similar to sub-synchronous resonances [51][52][53]. Contrary to the previously mentioned instability issues at high frequencies, SSO cannot be effectively prevented by acting on L. Indeed, to do so, L should assume values impractical to obtain.…”

Section: Accurate MMC Modelmentioning

confidence: 99%

Impact of Passive-Components’ Models on the Stability Assessment of Inverter-Dominated Power Grids

et al. 2022

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Power systems are experiencing some profound changes, which are posing new challenges in many different ways. One of the most significant of such challenges is the increasing presence of inverter-based resources (ibrs), both as loads and generators. This calls for new approaches and a wide reconsideration of the most commonly established practices in almost all the levels of power systems’ analysis, operation, and planning. This paper focuses specifically on the impacts on stability analyses of the numerical models of power system passive components (e.g., lines, transformers, along with their on-load tap changers). Traditionally, loads have been modelled as constant power loads, being this both a conservative option for what concerns stability results and a computationally convenient simplification. However, compared to their counterparts above, in some operating conditions ibrs can effectively be considered real constant power loads, whose behaviour is much more complex in terms of the equivalent impedance seen by the network. This has an impact on the way passive network components should be modelled to attain results and conclusions consistent with the real power system behaviour. In this paper, we investigate these issues on the ieee14 bus test network. To begin with, we assess the effects of constant-power and constant-impedance load models. Then, we replace a transmission line with a dc line connected to the network through two modular multilevel converters (mmcs), which account for the presence of ibrs in modern grids. Lastly, we analyse how and to which extent inaccurate modelling of mmcs and other passive components can lead to wrong stability analyses and transient simulations.

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Section: Accurate MMC Modelmentioning

confidence: 99%

Impact of Passive-Components’ Models on the Stability Assessment of Inverter-Dominated Power Grids

et al. 2022

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“…Substituting the flux equation (12) into the voltage equation (11), the intermediate flux variables , , , and are eliminated. After linearization, the equation of state vector Δ Δ Δ Δ Δ Δ Δ Δ can be obtained by using equations (15), (19), and (20).…”

Section: B Vibration Analysis Of Electromechanical Couplingmentioning

confidence: 99%

“…X. Zhu et al [11] used time-domain analysis to examine the SSR problem. C. He et al [12] investigated the characteristics of SSR by using eigenvalue structural analysis (ESA). In this study, time-domain analysis and ESA methods, which are typically used for SSR in power systems, are employed to examine the torsional vibration of VFD, which can boost the application of more analysis methods used for SSR.…”

Section: Introductionmentioning

confidence: 99%

Torsional Vibration Analysis of Shaft in an Induced Draft Fan Due to Variable Frequency Drive

Zhang

Lü

et al. 2020

IEEE Access

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The torsional vibration problem of shaft in an induced draft fan (IDF) caused by frequency conversion driving technology is a result of dynamic electro-mechanical coupling behavior during the energy conversion. Therefore, it is difficult to understand the mechanism of torsional vibration by only analyzing the mechanical structure or the electrical structure. In this paper, eigenvalue structural analysis (ESA) and time-domain transient analysis, which are typically used to examine sub-synchronous resonance (SSR), are employed to resolve this issue. It is difficult to develop a linear model for complex controllers with ESA as ESA can cause certain errors during the linearization and estimation of initial values of equilibrium points. On the contrary, time-domain analysis not only offers a small-step integration technique to simulate a realistic condition but also facilitates transient analysis of complex controllers. Transient analysis has been used to study the influence of elastic parameters of shaft, self-damping coefficients, resistance of the stator side, smooth reactance of the stator side, and voltage-frequency ratio on the control of target frequency converters and cascade multilevel high-voltage frequency converters. In this paper,It is also advised to avoid torsional resonance region with torsional-vibration monitoring during the operation of the system, and stator resistance can be added and the voltage-frequency rate can be adjusted to obtain an integrated control of an active torsional-vibration system.

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“…Some previous studies such as [9,10] have shown that the synchronization system parameters affect the power system stability in the case of weak grids. Besides the impact of the Power System Stabilizer (PSS) on the SSR damping has been previously demonstrated in [11][12][13][14]. Aware of these considerations and starting from the combined electromechanical model developed in [1], the same authors present in this paper a more accurate model providing the electrical damping assessment.…”

Section: Introductionmentioning

confidence: 95%

Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation

Bongini

Mastromauro

Sgro³

et al. 2020

Energies

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Liquefied Natural Gas (LNG) plants are commonly island-operated weak grids where the interaction of high-power Variable Frequency Drives (VFDs) with the Turbine-Generator (TG) units might cause Sub-Synchronous Torsional Interaction (SSTI) phenomena. SSTI phenomena can lead the LNG plant to instability conditions. Each LNG plant configuration is characterized by a risk level, which is considered high when the electrical damping at the TG Torsional Natural Frequencies (TNFs) is negative. Starting from a real case study, a detailed electromechanical model of an LNG plant is presented. The model is comprehensive of the control system of the power conversion stage and of the TG unit. Sensitivity analysis, performed on control system parameters, allows one to detect the parameters that impact the electrical damping and the stability of the overall LNG plant. A complete simulation platform is developed. Experimental results are carried out on a real LNG plant considering four different configurations. The theoretical model and the simulation platform allow one to estimate the electrical damping and the results are confirmed by the experimental validation. It is demonstrated that fine tuning of the power conversion stage control parameters can reduce the risk related to torsional instability.

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Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System

Cited by 10 publications

References 10 publications

Impact of Passive-Components’ Models on the Stability Assessment of Inverter-Dominated Power Grids

Impact of Passive-Components’ Models on the Stability Assessment of Inverter-Dominated Power Grids

Torsional Vibration Analysis of Shaft in an Induced Draft Fan Due to Variable Frequency Drive

Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation

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