Electromechanical transient model for cascade connection type multi-terminal direct current power transmission system and inter-station coordination method

Abstract

The invention relates to an electromechanical transient model for a cascade connection type multi-terminal direct current power transmission system and an inter-station coordination method. According to the method, the model is based on the existing two-terminal direct current electromechanical transient model, the direct current side circuit is extended to a cascade connection multi-terminal structure, a complete direct current side circuit is established, the two-terminal direct current margin coordination strategy is extended to a cascade connection multi-terminal system, and an inter-station coordination control method in the cascade connection system is provided; and moreover, according to the electromechanical transient model and the method, the three-terminal and four-terminal + / -800kV cascade connection extra-high voltage direct current power transmission system is covered.

Description

technical field [0001] The invention relates to the technical field of power system simulation and modeling, in particular to an inter-station coordination method for an electromechanical transient model of a cascaded multi-terminal direct current transmission system. Background technique [0002] At present, the conventional two-terminal HVDC transmission project is widely used, and the simulation calculation model tends to be mature. Compared with the two-terminal DC transmission system, the modeling of the multi-terminal DC transmission system is relatively lagging behind. In China, the multi-terminal DC transmission model in the electromechanical transient simulation software PSD-BPA is mainly used. The main disadvantages of this model are: [0003] (1) The inverter part does not simulate the process of commutation failure, which is quite different from the actual response of the inverter; [0004] (2) The control method is ancient, which is quite different from the co...

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Problems solved by technology

[0003] (1) The inverter part does not simulate the process of commutation failure, which is quite different from the actual response of the inverter;

[0004] (2) The control method is ancient, which is quite different from the control characteristics of modern direct current transmission projects;

[0005] (3) Inter-station coordination control strategy without consideration of multiple converter stations

[0006] (4) This model is a parallel multi-terminal direct current transmission system model, not a cascaded multi-terminal direct current transmission system model, which cannot meet the needs of cascaded multi-terminal direct current transmission system simulation

However, there is not yet a complete set of schemes for inter-station voltage and current coordination of cascaded multi-terminal direct current transmission systems, such as how to coordinate and control systems with different topologies, etc.

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