Development of instantaneous transient torque protection against torque amplification for turbine generators in a series-compensated power system

Liu, Pengyin; Lin, Guanghui; Shair, Jan; Xie, Xiaorong

doi:10.1016/j.ijepes.2021.107444

Cited by 3 publications

(7 citation statements)

References 18 publications

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“…The size of the local load required to avoid shaft fatigue life loss during islanding was called the critical load value and the corresponding torque, the critical torque. Equation (11) expresses the load condition to avoid shaft fatigue life loss during islanding.…”

Section: Proposed Protection Methodsmentioning

confidence: 99%

“…P l = k P gen (11) where k is the safety factor. Its value is determined by the critical load value and must be in the following ranges to avoid shaft fatigue life loss during islanding: 0.05 ≤ k ≤ 2.7 when ∆P 1 > 0 or 0.1 ≤ k ≤ 1.8 when ∆P 1 < 0.…”

Section: Proposed Protection Methodsmentioning

confidence: 99%

“…While these approaches simplify the calculation of shaft torque, they all do not relate the network operating parameters to shaft fatigue life loss. According to Liu et al [11], this is a problem because the protection system will not be able to evaluate shaft fatigue life loss accurately.…”

Section: Related Workmentioning

confidence: 99%

“…Indeed, a huge torque impulse may cause shaft damage in less than a full cycle of the torque waveform, almost instantly, before even the OMPS can estimate the fatigue life loss incurred by the shaft since OMPSs evaluate shaft fatigue life loss based on complete cycles of the torque waveform, according to the rain-flow cycle counting technique [8]. According to Liu et al [11], the inability of OMPSs to capture torque impulses timely is mainly due to the long response time of the signal processing methods or filters. These researchers also stated that OMPSs have the following drawbacks: They do not evaluate shaft fatigue life loss accurately because of the lack of a cause-to-effect relationship between the turbine generator operating quantities and shaft fatigue life loss.…”

Section: Introductionmentioning

confidence: 99%

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A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

Babi

Bokoro

2022

Energies

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A distributed generation steam turbine generator (hereafter referred to as turbine generator) improves the supply reliability of the local load when operated as a backup supply during islanding. Interconnection standards recommend removing the utility load from the island. Transient torques induced at the moments of islanding and removing the utility load from the island may cause shaft fatigue life loss and lead to fatigue damage. Therefore, a protection method is proposed in this work. The method is based on predicting the risk of shaft fatigue damage. Induced transient torque is first modeled. Fatigue study determines the local load size required to mitigate shaft torsional vibrations and avoid fatigue life loss during islanding. This is substituted in the torque function to obtain the critical torque. The risk of shaft fatigue damage is predicted by comparing the actual shaft torque with the critical torque. The turbine generator is shut down when the actual shaft torque during islanding exceeds the critical torque. Islanding on the local load is allowed when the actual shaft torque is smaller than the critical torque. The proposed method yields 0.011% shaft fatigue life loss under the most adverse islanding condition against 100% obtained with an online monitoring and protection system (OMPS).

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Section: Proposed Protection Methodsmentioning

confidence: 99%

Section: Proposed Protection Methodsmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

Babi

Bokoro

2022

Energies

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“…However, the wind farm also can experience such harmful oscillations, but with very low possibility. [71] analyzed the SSTA in wind turbine generator system under a series compensated grid. Further, the protection method is put forward to alleviate the aforesaid SSTA.…”

Section: Ssrmentioning

confidence: 99%

Recent development and future trends of resonance in doubly fed induction generator system under weak grid

Din

Zhang

Zheng

et al. 2022

IET Renewable Power Gen

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In recent years, the wind energy conversion system faces significant challenges for stable and secure operations, especially in the weak grid due to high penetration of wind energy into the grid. Doubly fed induction generator (DFIG) is one of the most popular wind turbine generators due to its cost‐effective variable speed and low‐cost partial size power converter. Impedance interaction between series or parallel compensated weak grid and the DFIG system causes sub‐synchronous resonance (SSR) and high‐frequency resonance (HFR). A comprehensive review of the state‐of‐the‐art SSR and HFR in the DFIG system under a weak grid is presented. First, based on features, such as supplementary hardware, linear and non‐linear control strategies, the resonance damping techniques are classified into different types. Then, the advantages and disadvantages of SSR analysis and damping techniques techniques are put forward. Moreover, the latest development of state‐of‐the‐art SSR and HFR analysis and damping techniques are supplemented. Finally, the contemporary and future trends of the SSR and HFR techniques are discussed.

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Fast and accurate method for sub‐synchronous oscillation detection

Abdeen,

El‐Sayed,

Diab

et al. 2023

IET Renewable Power Gen

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Detection of sub‐synchronous oscillation (SSO) accurately within a short time poses a big challenge to avoiding the potential risks of the SSO phenomenon. This paper proposes a novel technique for detecting the SSO phenomenon based on identifying the SSO frequency and magnitude rather than applying fast Fourier transform. The voltage magnitude signal is used as an input signal. The SSO magnitude is identified based on estimating the max value of the voltage magnitude signal, whereas the time corresponding to the zero crossings is defined for calculating the SSO frequency. In order to confirm its effectiveness, the proposed technique is tested with different SSO types (induction generator effect, torsional interaction, and sub‐synchronous control interaction). Moreover, the impact of the series compensation level change on the proposed method performance is investigated. The results prove the effectiveness and the speed of the proposed method in all studied cases. Compared to the traditional methods within a wide range of compensation levels, the proposed technique is fast and accurate. The IEEE first benchmark model is adapted with a doubly‐fed induction generator in the MATLAB program to analyze the performance of the proposed method for detecting the SSO phenomenon.

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Development of instantaneous transient torque protection against torque amplification for turbine generators in a series-compensated power system

Cited by 3 publications

References 18 publications

A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

Recent development and future trends of resonance in doubly fed induction generator system under weak grid

Fast and accurate method for sub‐synchronous oscillation detection

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