Series compensation for increased power transmission capacity

Currently there is a need to synchronize operation of the electric power system in the remote areas and increase of existing lines transmission capacity. The construction of new power transmission lines involves high economic expenditures. Well-known papers consider the issues of application of controlled series compensation devices only for long-distance power transmission lines with voltage of 500 kV and higher to increase the transmission capacity and the level of stability. The aim of the study is to increase the stability and the limit of the transmitted power when controlled series compensation devices are installed on 220 kV lines. It is necessary to develop a criterion of aperiodic steady-state stability of an electric power system with a 220 kV-controlled power transmission line. Methods of mathematical modeling of electric power system, the theory of long-distance power transmission lines and electromechanical transients, and methods of analyzing electric power system stability were used. A.M. Lyapunov’s first approximation method was used to develop a simplified mathematical model. We applied the developed software as a simulation tool. An analysis was carried out to study the influence of series compensation devices regulation coefficients on the aperiodic steady-state stability of the electric power system and the transmission capacity of 220 kV power transmission lines. A change in the modulus of voltage drop at the power transmission and the angle characteristics under the influence of the regulation coefficients of the series compensation device was revealed. A criterion of aperiodic steady-state stability has been developed for systems of this kind with controlled series compensation. It differs from traditional ones by considering the changes in the voltage drop in the power transmission and it allows more accurate estimation of the proximity to the stability threshold. An assessment of aperiodic steady-state stability according to the formulated criterion for an electric power system with a controlled series compensation device on a 220 kV line was obtained. The values of the control coefficients of the series compensation device have been determined. No violation of the steady-state stability occurs under the given values. The results can be used to solve the issues of increasing the transmission capacity of transmission lines to improve the stability of the system.

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Novel transient stability analysis of grid connected hybrid wind/PV system using UPFC

International Journal of Electrical Engineering Education ◽

10.1177/00207209211003268 ◽

2021 ◽

pp. 002072092110032

Author(s):

S Arockiaraj ◽

BV Manikandan

Keyword(s):

Fuzzy Logic ◽

Transient Stability ◽

Fuzzy Logic Controller ◽

Power Transmission ◽

Dynamic Performance ◽

Wind Farms ◽

Pv System ◽

Turbine Generator ◽

Series Compensation ◽

Wind Turbine System

In transmission line, the series compensation is used to improve stability and increases the power transmission capacity. It generates sub synchronous resonance (SSR) at turbine-generator shaft due to the interaction between the series compensation and wind turbine system. To solve this, several methods have been presented. However, these provide less performance during contingency period. Therefore, to mitigate the SSR and also to improve the dynamic performance of hybrid wind and PV system connected with series compensated wind farms, the adaptive technique of the Black Widow Optimization algorithm based Fuzzy Logic Controller (BWO-FLC) with UPFC is proposed in this paper. Here, the objective function is solved optimally using BWO technique. Based on this, the Fuzzy Logic Controller is designed. The results proved that the proposed controller performs the mitigation of SSR. The damping ratios of proposed controller to mitigation of SSR are 0.0098, 0.0139, and 0.0195 for wind speed of 6, 8 and 10 m/s respectively.

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Study on the characteristics of secondary arc current of UHV high compensation degree TCSC line under the fine-tuning mode

International Journal of Emerging Electric Power Systems ◽

10.1515/ijeeps-2020-0202 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Baina He ◽

Yadi Xie ◽

Jingru Zhang ◽

Nirmal-Kumar C. Nair ◽

Xingmin He ◽

...

Keyword(s):

Transmission Line ◽

Transmission Lines ◽

Stability Margin ◽

Transmission Capacity ◽

Fine Tuning ◽

Series Compensation ◽

Arc Current ◽

Compensation Device ◽

The Stability ◽

Recovery Voltage

Abstract In the transmission line, the series compensation device is often used to improve the transmission capacity. However, when the fixed series capacitor (FSC) is used in high compensation series compensation device, the stability margin cannot meet the requirements. Therefore, thyristor controlled series compensator (TCSC) is often installed in transmission lines to improve the transmission capacity of the line and the stability of the system. For cost considerations, the hybrid compensation mode of FSC and TCSC is often adopted. However, when a single-phase grounding fault occurs in a transmission line with increased series compensation degree, the unreasonable distribution of FSC and TCSC will lead to the excessive amplitude of secondary arc current, which is not conducive to rapid arc extinguishing. To solve this problem, this paper is based on 1000 kV Changzhi-Nanyang-Jingmen UHV series compensation transmission system, using PSCAD simulation program to established UHV series compensation simulation model, The variation law of secondary arc current and recovery voltage during operation in fine tuning mode after adding TCSC to UHV transmission line is analyzed, and the effect of increasing series compensation degree on secondary arc current and recovery voltage characteristics is studied. And analyze the secondary arc current and recovery voltage when using different FSC and TCSC series compensation degree schemes, and get the most reasonable series compensation configuration scheme. The results show that TCSC compensation is more beneficial to arc extinguishing under the same series compensation. Compared with several series compensation schemes, it is found that with the increase of the proportion of TCSC, the amplitude of secondary arc current and recovery voltage vary greatly. Considering various factors, the scheme that is more conducive to accelerating arc extinguishing is chosen.

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Impact of 750kV Transmission Line Series Compensation Capacity on Power Frequency Overvoltage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.986-987.330 ◽

2014 ◽

Vol 986-987 ◽

pp. 330-333

Author(s):

Ding Jun Wen ◽

Xiu Bin Zhang ◽

Hong Gang Chen ◽

Feng Jiang ◽

Ya Ming Sun

Keyword(s):

Transmission Line ◽

Single Phase ◽

Power Transmission ◽

Series Compensation ◽

Two Phase ◽

Transient Model ◽

Power Frequency ◽

Arc Current ◽

Recovery Voltage ◽

Insulation Coordination

The overvoltage calculation of 750kV transmission line with series compensation has great significance on the design, insulation coordination and protection of the line. In this paper, a transient model of 750kV power transmission system with series compensation is established. Effects of different capacity on no-load capacitive rise overvoltage, single-phase grounding overvoltage, two-phase grounding overvoltage are calculated. Secondary arc current and recovery voltage of different series compensation capacity in single-phase grounding is also calculated.

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