期刊
IEEE TRANSACTIONS ON POWER SYSTEMS
卷 36, 期 4, 页码 2877-2890出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2021.3051770
关键词
Power conversion; Converters; Frequency control; Voltage control; Topology; Decentralized control; Communication networks; Consensus cooperative control; communication networks; frequency regulation; VSC-MTDC
资金
- National Natural Science Foundation of China (NSFC) [51520105011]
- 111 Project of China [B17016]
- Excellent Innovation Youth Program of Changsha of China [KQ1905008, TPWRS-00196-2020]
A distributed cooperative control strategy based on the consensus protocol is proposed for frequency support in VSC-MTDC systems. It utilizes a cooperative agent network for local P-V droop control and balancing power sharing. Additionally, a topology evaluating method is suggested to mitigate the impact of communication failures.
A distributed cooperative control (DCC) strategy based on the consensus protocol is proposed for providing frequency support through voltage source converter based multi-terminal direct current transmission (VSC-MTDC) systems. The DCC consists of a local P-V droop controller and a cooperative agent network for cooperation control. Each agent controller is composed of a frequency regulation subagent (FRA) for frequency support and a load ratio subagent (LRA) for balancing the power sharing amongst the stations connected to the same ac grid. Moreover, to reduce the impact of the communication link failure, a topology evaluating method is proposed to select the suitable topology of the communication network via graph theory. The small signal stability analysis and the steady-state analysis are performed to investigate the stability and the consensus performance of the VSC-MTDC systems with DCC. Compared with decentralized control, the DCC can simultaneously achieve better frequency support and power sharing without leading to a large dc voltage deviation. The effectiveness of the DCC is verified by simulations on a hybrid ac/dc grid with a 7-terminal VSC-MTDC in DIgSILENT/PowerFactory under the load step change event and communication failure event.
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