Dynamic Turn-off Angle Control Considering the Change of Minimum Turn-off Angle of Thyristor

doi:10.12204/j.issn.1000-7229.2021.08.010

Abstract

Abstract:

To reduce the probability of commutation failure in practical engineering, the dynamic turn-off angle model of thyristor is established in PSCAD, and the actual criterion of commutation failure is obtained by determining the dynamic minimum turn-off angle. Then, the variation of turn-off angle of the thyristor valve is introduced into the control system, and a dynamic control method for turn-off angle is proposed. The proposed control method was improved on the CIGRE standard test model and realized by PSCAD/EMTDC simulation. The simulation results show that the actual criterion of commutation failure can effectively improve the accuracy of commutation failure identification. The dynamic control method for turn-off angle can mitigate the commutation failure caused by single-phase or three-phase short-circuit faults better. It can be beneficial for the control and protection system of DC transmission to adjust the control margin of turn-off angle of converters, which has practical engineering significance.

Key words: HVDC, minimum thyristor turn-off angle, dynamic control of turn-off angle, commutation failure

CLC Number:

TM46

HUANG Xiaojing, WU Xueguang, FAN Zheng, GU Huaiguang, HAN Minxiao. Dynamic Turn-off Angle Control Considering the Change of Minimum Turn-off Angle of Thyristor[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(8): 81-88.

Figures/Tables 9

Fig.1 Logic diagram of sampling circuit

Fig.2 Schematic diagram of fixed turn-off angle controller

Fig.3 Schematic diagram of dynamic control of turn-off angle

Fig.4 Simplified model of an HVDC system

Fig.5 DC voltage response curve when minimum thyristor turn-off angle changes

Fig.6 System dynamic performance of scheme 1 under single-phase fault with Rf=15 Ω

Fig.7 System dynamic performance of scheme 2 under single-phase fault with Rf=15 Ω

Fig.8 System dynamic performance of scheme 1 under three-phase fault with Rf=15 Ω

Fig.9 System dynamic performance of scheme 2 under three-phase fault with Rf=15 Ω

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