Improvement of power system stability by on‐off discrete control of series capacitors

Hara, T.; Kobayashi, Naoki; Takei, Akihisa; Tanomura, Kenichi; Koyanagi, Kaoru; Komukai, Toshihiko

doi:10.1002/eej.4391170403

Cited by 2 publications

(7 citation statements)

References 2 publications

(1 reference statement)

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“…The system is called onoff discrete control. The authors have already shown that the improvement of system stability by onoff discrete control is the same as that of the continuous capacitance control [8].…”

Section: Introductionmentioning

confidence: 90%

“…8, there is a danger that SSR may occurs so long as the power system contains the series capacitor. Although the generation mechanism is the same, the probability of torsional oscillation of the shaft and SSR is expected to be higher than in the case of a series capacitor with fixed capacitance for the following two reasons.…”

Section: Generation Mechanism Of Ssr In Series-capacitor Compensated mentioning

confidence: 99%

“…In the following, the capacitance of the series capacitors is represented by a percentage relative to the reactance of the transmission lines (degree of compensation). The number of series capacitor modules in the model system is set as 8, which realizes the highest suppression of the disturbance, based on the results of calculation of the transient stability with the number of modules as the parameter [8]. The model for the shaft system of the generator is assumed as a simple two-mass model, composed of the generator and the turbine, so that a single torsional oscillation is realized.…”

Section: Model Systemmentioning

confidence: 99%

“…As the last step, optimality of the insertion/shorting timing, as well as SSR avoidance control (these two are combined in the torsional oscillation countermeasure), are added to the control in order to improve the stability proposed by the authors [8]. The effectiveness of the torsional oscillation countermeasure is verified by EMTP simulation.…”

Section: Introductionmentioning

confidence: 99%

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On-off discrete control of series capacitors for power system stability with torsional oscillation countermeasure

et al. 1999

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Application of controlled series capacitors with antiparallel thyristor combination across the capacitor segment is a new and promising countermeasure for enhancement of power system stability. The line reactance can be directly controlled by the controlled series capacitors; hence, it is very effective to apply the capacitors for damping power system disturbances. However, the segmented series capacitors may cause subsynchronous resonance (SSR) that can lead to turbine‐generator shaft failure and electrical instability at oscillation frequencies lower than normal system frequency as well as the conventional capacitor may cause. In this paper, we describe the following. (1) The response of turbine‐generator shaft torque is analytically discussed when the number of inserted series capacitors in the power system is changed. (2) It is proposed for SSR countermeasure that the control system will be designed to avoid the number of series capacitor segments which may cause SSR in addition to selecting better on‐off timing of series capacitors. (3) The effects of the proposed countermeasures are confirmed by the results of EMTP simulations using both simplified two‐mass shaft model and detailed five‐mass shaft model of turbine‐generator. © 1999 Scripta Technica, Electr Eng Jpn, 128(3): 31–42, 1999

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Section: Introductionmentioning

confidence: 90%

Section: Generation Mechanism Of Ssr In Series-capacitor Compensated mentioning

confidence: 99%

Section: Model Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On-off discrete control of series capacitors for power system stability with torsional oscillation countermeasure

et al. 1999

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“…Table 5 shows the angles of the first and second waves, swing periods, and damping time constants relative to the internal phase-difference angle of the generator. Here, the swing period is determined from the peaks of the first and second waves and the damping time constant is calculated from the following equation [8]:…”

Section: Step Change Of Tcsc Firing Anglementioning

confidence: 99%

A study of thyristor controlled series capacitor models for power system stability analysis

Kai¹,

Takeuchi²,

Sato³

et al. 1999

Elect. Eng. Jpn.

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The thyristor‐controlled series capacitor (TCSC) is promising as a powerful device to increase power transfer capability and transient stability. The basic configuration of the TCSC consists of a series of capacitors connected antiparallel with thyristor‐controlled reactors, so that firing angle control of the thyristors makes the TCSC capable of achieving impedance control in a wide range with quick response. It is important to clarify the relationship between the fundamental reactance of the TCSC and the firing angle of the thyristors, thus leading to practical applications of the TCSC for enhancement of power transfer capability and transient stability in transmission lines. Two relationship equations for the TCSC's fundamental reactance have already been proposed. One is the relationship equation derived from a TCSC circuit whose source is a voltage. The other is the relationship equation derived from a TCSC circuit whose source is a current. For TCSC installed in a transmission line, it is clear which equation is more adequate for analyzing power system stability. In this paper, the authors determine whether either of the equations is valid for analyzing a power system stability. In the steady state, the TCSC fundamental reactance is analyzed and compared with the two equations and EMTP. It is clear that the TCSC reactance based on current source is adequate. The swing angle of a generator when the firing angle is stepped up is analyzed with EMTP and an analytical model using the TCSC model based on current source. It is shown that the proposed model is effective for power system stability analysis. © 1999 Scripta Technica, Electr Eng Jpn, 129(1): 20–28, 1999

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Improvement of power system stability by on‐off discrete control of series capacitors

Cited by 2 publications

References 2 publications

On-off discrete control of series capacitors for power system stability with torsional oscillation countermeasure

On-off discrete control of series capacitors for power system stability with torsional oscillation countermeasure

A study of thyristor controlled series capacitor models for power system stability analysis

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