Impacts of Weak AC System on the Commissioning and Operation of UHVDC Transmission Project

doi:10.11930/j.issn.1004-9649.2014.10.47.4

Abstract

Abstract: Ultra-high voltage direct current(UHVDC ) system is characterized by large transmission capacity, high reactive power consumption and complex control system, while a weak AC sending system has much simple grid structure and power source composition. Consequently, the DC fault or disturbance can bring many problems to the power grid. An analysis is made on some problems of the weak AC system of UHVDC, such as safety and stabilization of power system, DC startup and power ramping & decreasing, overvoltage, and coordination between generators and power grid. Based on the commissioning of Xiang-Shang UHVDC project, some issues that needs to be addressed and corresponding controlling strategies are proposed for commissioning of UHVDC project with weak AC system, including optimization of commissioning items, operation mode of power system and stability control measures, voltage/reactive power control, and protection configuration of DC lines. Meanwhile, some other phenomena occuring during operation of the UHVDC with weak AC system are analyzed. The conclusions made in this paper can be a reference for planning, construction and operation of UHVDC project.

Key words: UHVDC project, weak AC system, system commissioning, safety and stability control, overvoltage, minimal startup power, SSO, magnetizing inrush current, commutation failure

CLC Number:

TM721

WANG Hua-wei, HAN Min-xiao, ZHANG Jian, GUO Xiao-jiang, WU Yani, YANG Wan-kai, LIU Yao, SONG Rui-hua. Impacts of Weak AC System on the Commissioning and Operation of UHVDC Transmission Project[J]. Electric Power, 2014, 47(10): 47-51.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.10.47.4

https://www.electricpower.com.cn/EN/Y2014/V47/I10/47

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