Study on reverse recovery characteristics of thyristor used in HVDC converter valve

Li, W.F.; Kong, Dezhi; Yue, K.; Li, S.B.; Sun, W.; Peng, Jiun-Yan; Wang, K.; Tan, Xiaobo; Liu, X.D.; Zhang, Q.G.; Pang, Lei

doi:10.1049/cp.2016.0486

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the valve turn-off process, the energy stored in the main circuit inductances feeds into the damping circuits to charge the damping capacitances, causing extra power losses on the damping resistance. Besides, the stored charges in the thyristors turned off are dissipated by reverse recovery currents [33], also resulting in power losses on both thyristors and damping resistances. According to practical engineering, 15% to 30% of the total power losses in the converter valve are the switching losses [34], which is necessary for the efficiency analysis.…”

Section: Turn-off Power Losses Plmentioning

confidence: 99%

Analysis and Design of Damping Circuit Parameters for LCC Valves Based on Broadband Model

Tang

Zhang

2020

Energies

View full text Add to dashboard Cite

Damping circuits are installed inside the converter valve to limit commutation overshoots. They have significant effects on the valve’s turn-off performances, which should be carefully considered in parameter design. First, the calculation models for the turn-off process are discussed, including the conventional low frequency model and the broadband model. Then, it is found that high-frequency equipment parameters have significant effects on the transient valve voltage, which means that the conventional analytical methods based on low-frequency models is not suitable for damping circuit parameter design. The relationships between the turn-off performances and damping circuit parameters have also been analyzed in detail with the broadband model. To achieve better economic efficiency, this paper proposes a novel method for damping circuit parameter optimization, which combines the electromagnetic transient (EMT) calculation and the numerical optimization. Last, the case study is carried out based on a practical ±1100 kV ultra-high-voltage direct-current (UHVDC) transmission project, which proves the reliability and flexibility of the proposed method.

show abstract

Section: Turn-off Power Losses Plmentioning

confidence: 99%

Analysis and Design of Damping Circuit Parameters for LCC Valves Based on Broadband Model

Tang

Zhang

2020

Energies

View full text Add to dashboard Cite

show abstract

“…Fig. 1 shows the diagram of thyristor current in the outgoing valve during and after commutation [18]. During forward conducting ( t < t 0 ), the direct transmission current I d flows through the thyristor.…”

Section: Turn‐off Models Of Thyristormentioning

confidence: 99%

Commutation overshoots based on a novel model for series thyristors during the turn‐off process

Tang

Xiao

et al. 2020

High Voltage

View full text Add to dashboard Cite

The commutation overshoot is an important reference index for the insulation coordination of the converter station as well as the thyristor voltage capacity. Although the dispersity of reverse recovery charges of series thyristors may affect commutation overshoots, especially those at the thyristor level, little literature has tried to analyse it in detail. Firstly, this study compares the turn‐off models of independent thyristor and elaborates their applicability to series thyristors. Then, a novel model for series thyristors during the turn‐off process is proposed, based on which the turn‐off model of converter valve is also established. Subsequently, the validity and efficiency of the proposed model are discussed by simulations and it is applied to the analysis of commutation overshoots. The analysis shows that though the average model can be used to estimate the valve voltage stresses, it may lead to large errors in the thyristor voltage stress. And selecting the 1:n − 1 distribution as the distribution mode of reverse recovery charge in series thyristors will result in very conservative results.

show abstract

“…However, the current change rate in the auxiliary branch increases with the decreases of resonant inductance. The increase of current change rate will lead to an increase in the reverse recovery charge [13]. The increase in the reverse recovery charge will lead to an increase in the reverse recovery peak current and power loss.…”

Section: Introductionmentioning

confidence: 99%

Auxiliary Resonant Snubber‐Based Soft‐Switching Converter with Saturable Inductor to Reduce Reverse Recovery Current and Loss

Zhang

et al. 2023

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

The auxiliary resonant snubber‐based converter (ARSC) has the advantages of low dead‐time effect and low switching loss. However, the auxiliary switches suffer from high reverse recovery loss and high reverse recovery current in high‐switching frequency application. Thus, the ARSC with saturable inductor is proposed to solve the problem above. In this paper, the operating principle of ARSC with saturable inductor is analyzed, and the duty cycle operating range that can realize ZVS in the full load range is deduced. The reverse recovery model of the auxiliary switching device body diode is established to analyze the circuit parameters' influence. Then, the influence of the saturable inductor on the reverse recovery peak current and reverse recovery loss is analyzed. Based on the analysis results, the saturable inductance parameters are designed. Finally, based on the experimental platform of the ARSC, the effectiveness of the proposed method is verified. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

show abstract

Study on reverse recovery characteristics of thyristor used in HVDC converter valve

Cited by 3 publications

References 0 publications

Analysis and Design of Damping Circuit Parameters for LCC Valves Based on Broadband Model

Analysis and Design of Damping Circuit Parameters for LCC Valves Based on Broadband Model

Commutation overshoots based on a novel model for series thyristors during the turn‐off process

Auxiliary Resonant Snubber‐Based Soft‐Switching Converter with Saturable Inductor to Reduce Reverse Recovery Current and Loss

Contact Info

Product

Resources

About