Virtual Synchronous Generator Control Strategy of Three Terminal Back-To-Back Voltage Source Converter Based HVDC and Its Application in Distribution Network

doi:10.12096/j.2096-4528.pgt.2018.035

Abstract

Abstract:

A kind of connection scheme of three-terminal back-to-back (BTB) voltage source converter based HVDC(VSC-HVDC) system in 10 kV distribution network was discussed, which can improve the reliability of power supply and restrain the circulation by the control of VHC-HVDC. With the traditional control strategies, VSC-HVDC system has almost no interia and is hard to be involved in the dynamic regulation of the power system effectively. To improve the stability of the frequency in the receiving system and improve the performance of the system after the breakdown, the control strategy of virtual synchronous generator (VSG) in the application of three terminal back-to-back VSC-HVDC under a medium voltage (10 kV) AC distribution network context was proposed. First three terminal back-to-back VSC-HVDC device was added to the 10 kV system to establish the AC/DC hybrid distribution network, and the mathematical model of the converter under the traditional control and VSG control was established. Then the simulation was carried out by using the PSCAD/EMTDC platform, the operating characteristics of disturbance and fault were obtained in two control modes. The results show that the three-terminal back-to-back VSC-HVDC system can effectively participate in the regulation of power grid system using VSG control, and gain the interia to improve the system's performances of transient states, and the reliability of the grid are effectively improved.

Key words: virtual synchronous generator (VSG), interia, back-to-back voltage source converter based HVDC, distribution network

Dan ZOU,Xin AI,Ao WANG,Kunyu WANG,Renle HUANG,Naishi CHEN,Tianjiao PU. Virtual Synchronous Generator Control Strategy of Three Terminal Back-To-Back Voltage Source Converter Based HVDC and Its Application in Distribution Network[J]. Power Generation Technology, 2018, 39(3): 233-239.

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