Application of thyristor controlled phase shifting transformer excitation impedance switching control to suppress short-circuit fault current level

Liu, Juhua; Hao, Xudong; Wang, Xu; Chen, Yefu; Fang, Wanliang; Niu, Shuanbao

doi:10.1007/s40565-017-0372-2

Cited by 19 publications

(3 citation statements)

References 30 publications

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“…The power electronic devices in conjunction with PST and PAR uses semiconductor devices for the tap changing operations and hence avoids the arching phenomenon while tap changing process. [73]- [76]. The semiconductor-mechanical hybrid switch tap-changers called power-electronic-assisted tap changers, uses mechanical switches during the steady state whereas the semiconductor switches are used for the tap changing.…”

Section: Power Flow Controllers In Synchronous Ac Interconnections a Phase-shifting Transformersmentioning

confidence: 99%

A Comprehensive Review of Power Flow Controllers in Interconnected Power System Networks

et al. 2020

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Energy security is one of the most crucial factor in the development of any nation. Interconnections among different power system networks are made to lower the overall price of power generation as well as enhance the reliability and the security of electric power supply. Different types of interconnection technologies are employed, such as AC interconnections, DC interconnections, synchronous interconnections, and asynchronous interconnections. It is necessary to control the power flow between the interconnected electric power networks. The power flow controllers are used to (i) enhance the operational flexibility and controllability of the electric power system networks, (ii) improve the system stability and (iii) accomplish better utilization of existing power transmission systems. These controllers can be built using power electronic devices, electromechanical devices or the hybrid of these devices. In this paper, control techniques for power system networks are discussed. It includes both centralized and decentralized control techniques for power system networks. This paper also presents a comprehensive review of HVDC interconnections, asynchronous AC interconnections, synchronous AC interconnections and different types of power flow controllers used in these interconnections. Moreover, some important and multivariable flexible AC transmission system (FACTS) devices such as UPFC and IPFC are also discussed with their merits and limitations. Finally, a new asynchronous AC link called flexible asynchronous AC link (FASAL) system is also described in detail. At last, a summary of the comparative analysis of power system link and power flow controllers is given based on recent publications. More than 400 research articles and papers on the topic of power transfer control are covered in this review and appended for a quick reference.

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Section: Power Flow Controllers In Synchronous Ac Interconnections a Phase-shifting Transformersmentioning

confidence: 99%

A Comprehensive Review of Power Flow Controllers in Interconnected Power System Networks

et al. 2020

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“…Optimizing the control structure and the power loop design can minimize the influence of different branch parameters on the current sharing [1][2][3][4]. The symmetrical design of the power loop is adopted to optimize the layout's physical size and mounting structure [5]. The power loop's equivalent circuit impedance formation material, form, and current path are considered for impedance matching design in [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Variable Amplitude Gate Voltage Synchronous Drive Technique for Improving Dynamic Current Balancing in Paralleled IGBTs

Zhang

Lei

et al. 2023

Energies

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The problem of current sharing imbalance in the parallel connection of IGBT multi-modules affects the wide-scale application of parallel IGBT. The current imbalance problem in the dynamic process is mainly caused by the difference in control loop parameters. In parallel IGBT applications, current sharing is a critical concern. Objective differences in IGBT module and driver circuit parameters, as well as incomplete symmetry in the power circuit, lead to inconsistent parasitic parameters, resulting in both static and dynamic current-sharing issues. Static current sharing refers to the uneven distribution of load current under static operating conditions, while dynamic current sharing refers to the imbalance in current distribution among parallel IGBT modules during turn-on and turn-off processes. This is mainly influenced by the synchronization of turn-on and turn-off timings and the consistency of collector current change rates during these processes. The difference in characteristic parameters of IGBT modules is an important factor leading to the difference in control loop parameters, which has a profound impact on the dynamic current-sharing characteristics of IGBT parallel applications. In the case where the device parameters cannot be changed, some drive compensation controls can compensate for the influence of device differences on dynamic current sharing. Accurate identification of the characteristic parameters of the IGBT module is the key to this method. This paper mainly studies a synchronous variable-amplitude drive scheme and studies the influence of parameters such as synthetic gate resistance, gate-emitter capacitance, and on-off gate threshold voltage on the dynamic current-sharing characteristics. The correlation characteristics of the characteristic parameters of the IGBT device body are studied, and the characteristic model of each parameter and the influencing variable is constructed. The parallel working model of PSpice devices is established, and the influence of different characteristic parameters on the current-sharing characteristics is evaluated, and its sensitivity is summarized through simulation analysis. Through the 1700 V/300 A IGBT parallel switch characteristic experiment, the current sharing effectiveness of the synchronous variable amplitude driving method is verified. Finally, the effects of different gate control voltages and different action times on the dynamic current-sharing characteristics are summarized.

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“…The misoperations did not occurred frequently for a long time in the past and did not attract enough attention. With the increase of grid capacity [9], some new kinds of high-impedance transformer have been widely used [10,11] to limit short-circuit current [12]. However, when the high-impedance transformer (especially the high-impedance transformer with built-in high-voltage winding, T-Hin for short) is energized, the zero-sequence overcurrent protection of the bus connection switch and even the upper-level line will misoperate beyond their protection range, which seriously threatens the safety and stability of the power grid.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Zero-Mode Inrush Current of T-Hin on Zero-Sequence Overcurrent Protection and an Improved Protection with the Second Harmonic Restraint

et al. 2019

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In recent years, the zero-mode inrush current of high-impedance transformer with built-in high-voltage winding (T-Hin), which has large amplitude and decays slowly, causes the misoperation of zero-sequence overcurrent protection. Compared with magnetizing inrush current, the waveform of zero-mode inrush current is inconsistent and irregular, and few researches have proposed the mathematical analysis as well as the improved protection using waveform characteristics. In this paper, the mathematical expression of transformer zero-mode inrush current is derived. Further considering the parameter differences, the zero-mode inrush current of T-Hin is larger, which tends to cause the misoperation. The mathematical waveforms fit well with the recorded waveforms. Both recorded waveforms and mathematical waveforms in various conditions prove that the second harmonic ratio (the ratio between the second harmonic and first harmonic) of zero-mode inrush current is significant. Based on the above analysis, a criterion based on the second harmonic ratio restraint of zero-mode inrush current is proposed. If the second harmonic ratio exceeds the setting value, it is considered that the inrush current is generated and sends a signal to restrain the protection. The theoretical setting value of the proposed criterion and the practical engineering method for determining the setting value are obtained.

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Application of thyristor controlled phase shifting transformer excitation impedance switching control to suppress short-circuit fault current level

Cited by 19 publications

References 30 publications

A Comprehensive Review of Power Flow Controllers in Interconnected Power System Networks

A Comprehensive Review of Power Flow Controllers in Interconnected Power System Networks

Variable Amplitude Gate Voltage Synchronous Drive Technique for Improving Dynamic Current Balancing in Paralleled IGBTs

The Impact of Zero-Mode Inrush Current of T-Hin on Zero-Sequence Overcurrent Protection and an Improved Protection with the Second Harmonic Restraint

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