Design method of high-voltage direct-current multi-infeed full-electromagnetic transient simulation platform containing dynamic load

Abstract

The invention relates to a method for designing a high-voltage direct-current multi-infeed full-electromagnetic transient simulation platform with a dynamic load. The method comprises the following steps of: performing dynamic equivalence on a multi-direct-current infeed receiving end power grid with the dynamic load; selecting a simulation platform, and performing network division decoupling on each power grid and the corresponding direct current system to realize parallel operation after network division; developing a power grid multi-infeed direct current system electromagnetic transient real-time simulation model on the selected simulation platform; developing a power grid multi-DC feed-in receiving end AC power grid electromagnetic transient real-time simulation model on the selected simulation platform; and modeling the power grid load center on the selected simulation platform. A large system electromagnetic transient simulation platform is established, the defect that an electromechanical transient quasi-steady-state model cannot accurately simulate the working condition of a converter valve under an asymmetric fault and the phenomena of commutation failure and the like is overcome, and an accurate real-time simulation platform can be provided for analyzing the dynamic characteristics and commutation failure of a multi-direct-current feed-in system. The method has the advantages of being high in simulation speed, high in simulation precision and good in simulation real-time performance.

Description

technical field [0001] The invention relates to an electromagnetic transient simulation technology, in particular to a design method of a high-voltage direct current multi-feed full electromagnetic transient simulation platform with dynamic loads. Background technique [0002] With the current rapid economic growth, the demand for energy has further increased. At present, an energy supply pattern has been formed, with thermal power and hydropower as the main body, and wind energy, solar energy and other new and renewable energy sources developing in an all-round way. At the same time, large-scale coal power and wind power bases are mainly distributed in the western and northwestern regions, hydropower bases are concentrated in the southwestern region, and power generation bases are far away from the load center. In order to achieve large-scale power transmission and optimal allocation of large-scale power, it is necessary to develop effective energy transmission methods. P...

AI Technical Summary

Problems solved by technology

[0004] When the electrical distance of multiple infeed DCs is relatively short, an AC fault at a receiving end may cause commutation failures of multiple DCs at the same time, resulting in the interruption of DC transmission power, which will have a huge impact on the safe and stable operation of the entire system

For a multi-infeed DC system, a single AC system failure may also cause simultaneous commutation failure of multiple DC circuits

In addition, depending on the type of load, the magnitude of the voltage drop caused by the fault of the AC system is also different, which in turn affects the occurrence of commutation failure

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