Research on island operation of small scale hydro powered network with backto-back mmc-hvdc

• Published in: 8th Renewable Power Generation Conference (RPG 2019) p. 33
• Main Authors: Gai, Zhenyu, Wang, Fei, Li, Hui, Jiang, Weiyong, Chen, Qichao
• Format: Conference Proceeding
• Language: English
• Published: Stevenage, UK IET 2019; The Institution of Engineering & Technology
• Subjects: Active control; Control stability; Distributed power generation; Frequency stability; Generators; Hydroelectric power stations and plants; Power flow; Power supply quality and harmonics; Power system control; Power system management, operation and economics; Reactive power; Stability analysis; Voltage stability; asynchronous network connection; power system stability; system safety; HVDC power convertors; MMCHVDC project; power flow; probability; MMC-HVDC application; island system stability; hydroelectric power stations; distributed power generation; runoff hydro generators; equivalent network; MMC-HVDC project; China power grid; power supply quality; network island operation; power system interconnection; reactive power; active power; stability control measurement suggestions; power grids; small scale hydro powered network; island network
• ISBN: 9781839531255; 1839531258
• DOI: 10.1049/cp.2019.0290

With the rapid development of China's power grid, a great progress has been made in MMC-HVDC application. The MMC-HVDC has the advantages of decoupled control of active and reactive power, which provides significant potential in asynchronous network connection, small network island operation, etc. Based on potential scope of MMCHVDC project, island operation is an inevitable situation. The ability of HVDC to operate and maintain island system stable can help improving the power supply quality and reduce the loss of load probability. But the voltage stability, and most of all, the frequency stability plays important roles during island operation. This article is inspired by Chongqing-Hubei back to back MMC-HVDC project. Firstly an objective function of minimum generators combination requirement was proposed. Secondly an equivalent network with large number of runoff hydro generators was modelled. Finally the correlation of the power flow through the tie-line and the commission level of generators in island network was analysed, and the system safety and stability control measurement suggestions were provided.