The Navajo SMF Type Subsynchronous Resonance Relay

Bowler, C.E.J.; Demcko, J.A.; Mankoff, L. L.; Kotheimer, W.C.; Cordray, D.

doi:10.1109/tpas.1978.354640

Cited by 24 publications

(6 citation statements)

References 1 publication

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“…The severity of torsional interaction depends upon the aforesaid disturbances. Figure 2 shows the summary of the variables and their impact on electrical self‐excitation and torsional effects in the conventional turbine‐generator units [34].…”

Section: Analysis and Damping Of Ssrmentioning

confidence: 99%

“…The coincidence between subsynchronous resonant mode in the generator electromagnetic torque and shaft torsional mode is the main reason of torsional interaction in traditional turbine-generator units. The insertion of series capacitor, transmission line outage, and clear-FIGURE 2 Conceptual view of self-excitation and torsional interaction: Parameters impact [34] ing power system faults are the examples of disturbances causing transient interactions in the aforesaid conventional turbinegenerator units. The severity of torsional interaction depends upon the aforesaid disturbances.…”

Section: Ssr/sub-synchronous Oscillation (Sso) In Conventional Turbin...mentioning

confidence: 99%

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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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Section: Analysis and Damping Of Ssrmentioning

confidence: 99%

Section: Ssr/sub-synchronous Oscillation (Sso) In Conventional Turbin...mentioning

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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“…This small current also makes it more difficult to detect the SSR condition in the initial stage. The methods presented in [11][12][13], use the mechanical behaviour of the shaft speed. These types of relays detect the SSR phenomenon by sensing the speed of the rotor.…”

Section: Introductionmentioning

confidence: 99%

“…FIGURE12 FFT coefficients of the magnetic flux as a function of fault location and degrees of compensation under light loading (i.e. L2 = 0.1 + j0.2 p.u.)…”

mentioning

confidence: 99%

Precision enhancement of the traditional sub‐synchronous analysis by using frequency components of instantaneous magnetic flux

Yaghobi

2021

IET Generation Trans & Dist

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Sub-synchronous resonance (SSR) is a great danger to the stable and safe operation of the synchronous generator and power network. Detecting this condition in a fast and precise method is very important for power engineers. During the last decade, many methods have been proposed for SSR detection. The most famous of these methods use shaft speed analysis. On the other hand, it is noteworthy that SSR is a phenomenon that needs the use of both mechanical and electrical quantities for its analysis. Therefore, if both kinds of the signal are used, the protection system reliability can be enhanced significantly and its trip is more efficient and consistent. Subsequently, to enhance the precision and sensitivity of the SSR detection, this paper proposes the use of frequency analysis of the magnetic flux linkage of the generator as an electrical signal along with the shaft speed as a mechanical signal. The magnetic flux is a local index that is available at the relay location and does not require a communication channel to transmit. This index contains a lot of useful information about the performance of the machine. However, the main disadvantage of this index is its accessibility, which requires invasive sensors.

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“…Several methods have been presented for detection SSR in different ways, and avoid the risk of subsynchronous resonance in power systems. For instance, the static machine frequency (SMF) relay is the first version of torsional relay, which has been used for many years [11], [12]. It can detect the torsional instability based on shaft speed signal.…”

Section: Introductionmentioning

confidence: 99%

An Improved Fast Detection Method on Subsynchronous Resonance in a Wind Power System With a Series Compensated Transmission Line

Abdeen

Chai

et al. 2019

IEEE Access

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Subsynchronous resonance (SSR) occurs mainly in series compensated transmission line connected to the wind power system. This phenomenon (SSR) can lead to electrical instability and potential turbine generator shaft failure. Thus, the protection system is an essential part to avoid the harm of SSR. In this paper, an improved fast detection method is proposed to detect the SSR phenomenon in a very short time. It consists of two stages; first, the positive or negative half-cycle time of each cycle of voltage signal is detected based on four steps, namely, signal conversion, comparison, integrator, and sample and hold; second, the obtained time is compared with the damping and trip threshold values, and the best action is determined (addressing or trip) based on the value of half-cycle time. The effectiveness and superiority of the improved fast SSR detection method are validated at different compensation levels and compared with the traditional method and subsynchronous oscillation relay (SSO). The simulation results prove that the improved method is more efficient in all types of SSR phenomenon; induction generator effect (IGE), control interactions (CI), and torsional interaction (TI) at different compensation levels. In addition, a comparative study among these three types of SSR with the proposed method is carried out, and the obtained results show that the CI is a suitable type with the proposed method.

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The Navajo SMF Type Subsynchronous Resonance Relay

Cited by 24 publications

References 1 publication

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

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

Precision enhancement of the traditional sub‐synchronous analysis by using frequency components of instantaneous magnetic flux

An Improved Fast Detection Method on Subsynchronous Resonance in a Wind Power System With a Series Compensated Transmission Line

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