Resonance Investigation and Active Damping Method for VSC-HVDC Transmission Systems under Unbalanced Faults

被引:2
作者
Tang, Xin [1 ]
Zhan, Ruoshui [1 ]
Xi, Yanhui [1 ]
Xu, Xianyong [1 ]
机构
[1] Changsha Univ Sci & Technol, Sch Elect & Informat Engn, Changsha, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
Core saturation; High voltage direct current; Impedance frequency characteristics; Resonance; Unbalanced fault; Virtual harmonic resistor; Voltage-source converter; CONTROL STRATEGY; STABILITY ANALYSIS; AC NETWORK; VOLTAGE; OPERATION; CONVERTERS; HARMONICS; INVERTER;
D O I
10.6113/JPE.2019.19.6.1467
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Grid unbalanced faults can cause core saturation of power transformer and produce lower-order harmonics. These issues increase the electrical stress of power electronic devices and can cause a tripping of an entire HVDC system. In this paper, based on the positive-sequence and negative-sequence impedance model of a VSC-HVDC system as seen from the point of common connection (PCC), the resonance problem is analyzed and the factors determining the resonant frequency are obtained. Furthermore, to suppress over-voltage and over-current during resonance, a novel method using a virtual harmonic resistor is proposed. The virtual harmonic resistor emulates the role of a resistor connected in series with the commutating inductor without influencing the active and reactive power control. Simulation results in PSCAD/EMTDC show that the proposed control strategy can suppress resonant over-voltage and over-current. In addition, it can be seen that the proposed strategy improves the safety of the VSC-HVDC system under unbalanced faults.
引用
收藏
页码:1467 / 1476
页数:10
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