A Coordinated DC Power Support Strategy for Multi-Infeed HVDC Systems

Chunlei Zhang, Xiaodong Chu, Bing Zhang, Linlin Ma, Xin Li, Xiaobo Wang, Liang Wang and Cheng Wu
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Chunlei Zhang: Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, 17923 Jingshi Road, Jinan 250061, China
Xiaodong Chu: Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, 17923 Jingshi Road, Jinan 250061, China
Bing Zhang: Shandong Electric Power Dispatching and Control Center, Jinan 250001, China
Linlin Ma: Shandong Electric Power Dispatching and Control Center, Jinan 250001, China
Xin Li: Shandong Electric Power Dispatching and Control Center, Jinan 250001, China
Xiaobo Wang: Shandong Electric Power Dispatching and Control Center, Jinan 250001, China
Liang Wang: Shandong Electric Power Dispatching and Control Center, Jinan 250001, China
Cheng Wu: Shandong Electric Power Dispatching and Control Center, Jinan 250001, China

Energies, 2018, vol. 11, issue 7, 1-20

Abstract: A DC power support strategy utilizes the flexibility of a High-voltage direct-current (HVDC) system in power modulation to optimize the operating point or compensate the power imbalance caused by a disturbance. The major impediment to the strategy is the difficulty in maintaining DC voltage values at converter stations during the process of DC power support. To overcome the difficulty, a coordinated DC power support strategy for multi-infeed HVDC systems is proposed in this paper. Synchronous condensers are employed to provide dynamic reactive power compensation in sustaining DC voltage values at converter stations. Models are built for the optimal leading phase operation and adjusting excitation voltage reference value of synchronous condensers. Multiple HVDC links are coordinated to participate by using the DC power support factor to rank and select the links. Optimal DC power support values of the participating HVDC links are obtained with a comprehensive stability margin index that accounts for transient stability of the sending-end systems and frequency security of the receiving-end systems. An optimal load shedding model is used to ensure the frequency security of receiving-end systems. Case study results of a provincial power system in China demonstrate the effectiveness and performance of the proposed DC power support strategy.

Keywords: multi-infeed HVDC system; DC power support; synchronous condenser; leading phase operation; transient stability; frequency security (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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