多直流馈入受端系统与直流联络线协调恢复的一体化建模与求解

doi:10.19595/j.cnki.1000-6753.tces.230479

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Abstract

The formation of large-scale multi-infeed HVDC electric power transmission has led to an increasingly complex power system structure, which in turn has increased the risk of safety accidents. As a part of the power system security defense system, it is of great significance to study the power grid restoration strategy that involves the participation of HVDC tie lines. After a blackout of multi-infeed system, in order to select the appropriate time to connect to the HVDC tie lines and arrange the active power output of each inverter station effectively, a multi-time-step network reconstruction model was proposed which can coordinate the restoration of the key units, HVDC tie lines, and the transmission lines simultaneously.
Firstly, the paper analyzed the key indicators that affect the safety and stability of the AC/DC system. It was found that the technical bottleneck lies in establishing a linear relationship between node impedance and restoration decision variables during the modeling of short circuit capacity (SCC) and multi-infeed short circuit ratio (MISCR) constraints. To address the above issue, an integrated linear modeling of HVDC restoration security constraints was implemented by constructing an “n+1” network. This approach avoids potential risks caused by HVDC participation in the restoration process while meeting the strength requirements of multiple HVDC startup and operation in the receiving-end power grid.
In order to deal with the unavailability of the predetermined solutions due to secondary power loss of equipment during the restoration process, a rolling window mechanism was adopted, which not only meets the requirements of computing speed, but also effectively responds to unexpected situations in the system and adjusts decision scheme in a timely manner. Then, based on the rolling window mechanism, a dynamic sequential decision optimization model for source-grid coordinated restoration was established, which is a mixed integer linear programming model with branch state as the decision variable. In addition, two branch pre-screening strategies for the restoration process were proposed to improve the solving efficiency of the model. Finally, the proposed method was verified using the modified IEEE 39-bus system. And the results showed that the method not only taps into the regulatory potential of the grid to promote HVDC power increase and utilizes the power support effect of the multiple HVDC system after a blackout, but also performs better in stability, convergence, and global optimality compared to intelligent algorithms.
However, it should be noted that the above research mainly focuses on the network topology of the receiving-end system and improving the system restoration method with HVDC participation, without considering the control strategy of HVDC itself in detail. Therefore, how to coordinate and cooperate between the HVDC control system and the restoration process of the AC power grid is worth further exploration.

Key words： Source-grid coordinated restoration "n+1"network construction method sequential decision branch pre-screening mixed integer linear programming

Received: 17 April 2023

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TM732

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	Li Shaoyan
	Cao Ke
	Gu Xueping
	Wang Shuai

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Li Shaoyan,Cao Ke,Gu Xueping等. Integrated Modeling and Solution for Coordinated Restoration of Multi-Infeed Receiving-End Systems and HVDC Tie Lines[J]. Transactions of China Electrotechnical Society, 2023, 38(21): 5862-5877.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230479 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I21/5862

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