Research on novel var compensator based on dual-rotary phase-shifting transformers and its control strategy

Yan, Xiangwu; Deng, Wanjun; Wang, Guanghua; Rasool, Aazim; Qi, Shaomeng

doi:10.1016/j.ijepes.2022.108632

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…The heavy loading nature of electrified railway loads and the three-phase unbalance make the demand for capacity of compensating devices large. The cost of power electronic devices will be higher than that of traditional transformer devices with the same capacity, and the power electronic converter devices also have problems such as poor voltage resistance and weak impact resistance, which cannot meet the requirements of the new power system for the economy and safety of devices, and therefore, the devices are greatly limited in application [14]. Based on the above analysis, existing negative sequence compensation devices for co-phase power supply can barely meet the needs for the accuracy, reliability and economy of dynamic negative sequence and reactive power compensation at the same time.…”

Section: Introductionmentioning

confidence: 99%

“…The accurate power control strategy of RPFC has been proposed [18], and the flexible loop closing control method for an active distribution network based on RPFC have also been studied [19]. Reference [14] and reference [20] put forward two kinds of electromagnetic rotary var compensator based on RPST, which can realize the continuous and two-way adjustment of reactive power, and is characterized by low cost and strong impact resistance. Most of the current RPST-based studies are carried out in the three-phase system, and the researches on single-phase RPST are not mature, and the studies on RPST as a comprehensive compensation scenario for the co-phase power supply are inadequate.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Compensation Method for Co-phase Power Supply in Electrified Railways Based on V/v Transformer and Single-phase Rotating Var Compensator

Yan,

Wu,

Shao

et al. 2024

Preprint

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To solve the problem of negative-sequence and reactive power in electrified railway, this paper proposes a comprehensive compensation method based on V/v transformers and electromagnetic single-phase var compensator (ESVC) for co-phase power supply. First, based on the principles of static var generator (SVG) and single-phase rotary phase shifting transformer (SRPST), the topology and model of ESVC have been established, and the compensation mechanism has been analyzed. Second, the topological structure and mathematical model of co-phase power comprehensive compensation device (CPCD) are put forward based on the principles of V/v transformers and ESVC, and the operation mode of CPCD in multiple scenarios is designed. Then the strategy of CPCD with double closed loop control is analyzed: corresponding compensation mode is selected according to negative-sequence unbalance degree and expected power factor value. In this strategy, the compensated current output by ESVC is taken as the quantity of external loop control, and the rotation angle of ESVC is taken as the quantity of internal loop control to realize double-closed loop control of CPCD. Finally, the comprehensive CPCD compensation model is built on the simulation platform and validated the accuracy of the mathematical model and the effectiveness of the control strategy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive Compensation Method for Co-phase Power Supply in Electrified Railways Based on V/v Transformer and Single-phase Rotating Var Compensator

Yan,

Wu,

Shao

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Comprehensive compensation method for co‐phase power supply in electrified railways based on V/v transformer and electromagnetic single‐phase var compensator

Yan,

Wu,

Shao

et al. 2024

IET Generation Trans & Dist

View full text Add to dashboard Cite

To solve the problem of negative‐sequence and reactive power in electrified railway, this paper proposes a comprehensive compensation method based on V/v transformer and electromagnetic single‐phase var compensator (ESVC) for co‐phase power supply. First, based on the principles of static var generator and single‐phase rotary phase shifting transformer, the topology and model of ESVC have been established, and the compensation mechanism has been analysed. Second, the topological structure and mathematical model of co‐phase power comprehensive compensation device (CPCD) are put forward based on the principles of V/v transformer and ESVC, and the operation mode of CPCD in multiple scenarios is designed. Then the strategy of CPCD with double closed loop control is analysed: corresponding compensation mode is selected according to negative‐sequence unbalance degree and expected power factor value. In this strategy, the compensated current output by ESVC is taken as the quantity of external loop control, and the rotation angle of ESVC is taken as the quantity of internal loop control to realize double‐closed loop control of CPCD. Finally, the comprehensive CPCD compensation model is built on the simulation platform and validated the accuracy of the mathematical model and the effectiveness of the control strategy.

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Design and simulation optimization of phase-locked loop structure for phase-shifting power supply

Liu,

Li,

Zhong

et al. 2024

AIP Advances

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A phase-locked loop (PLL) of a phase-shifting power supply for the power system is designed in this paper. Taking the industrial frequency current as the reference signal, the input and output characteristics of the phase-frequency detector with charge pump are analyzed. In addition, the transfer function of the PLL system is analyzed by combining the passive second-order low-pass filter and the voltage-controlled oscillator. As a result, the influence of parameters such as charge pump current, phase margin, and loop bandwidth on the performance of the PLL is investigated, and the optimal parameters of each section are obtained. The results show that the optimized PLL has a locking time of 0.75 s, a pull-out range of 63.16 Hz, and a locking range of 43.82 Hz, with high stability and noise immunity.

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Research on novel var compensator based on dual-rotary phase-shifting transformers and its control strategy

Cited by 3 publications

References 30 publications

Comprehensive Compensation Method for Co-phase Power Supply in Electrified Railways Based on V/v Transformer and Single-phase Rotating Var Compensator

Comprehensive Compensation Method for Co-phase Power Supply in Electrified Railways Based on V/v Transformer and Single-phase Rotating Var Compensator

Comprehensive compensation method for co‐phase power supply in electrified railways based on V/v transformer and electromagnetic single‐phase var compensator

Design and simulation optimization of phase-locked loop structure for phase-shifting power supply

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