Multi-direct current power transmission output power system stable state frequency control method

Abstract

The invention discloses a multi-direct current power transmission output power system stable state frequency control method. The multi-direct current power transmission output power system stable state frequency control method comprises steps that S1, various related parameters are acquired; S2, a bus admittance matrix of a sending end power grid and a bus admittance matrix of a receiving end power grid are formed based on the acquired parameters; S3, related information before occurrence of disturbances is acquired; S4, related information after the occurrence of the disturbances is acquired; S5, the equality constraint condition of the multi-direct current power transmission output power system stable state frequency control method is established; S6, the inequality constraint condition of the multi-direct current power transmission output power system stable state frequency control method is established; S7, the minimization objective function of the multi-direct current power transmission output power system stable state frequency control method is established;S8, the optimization result of the multi-direct current power transmission output power system stable state frequency control method is acquired, and technical effect of optimization coordination control of multiple direct currents is realized.

Description

technical field [0001] The present invention relates to the field of power system frequency stability analysis and evaluation, in particular to a steady-state frequency control method for multiple DC transmission feed-in power systems. Background technique [0002] In China, the load center is usually far away from the power generation area. In order to carry out reasonable power transmission, HVDC transmission has been widely used due to its mature technology and economic characteristics of large transmission capacity and long transmission distance. With the rapid construction of DC transmission projects, many multi-infeed DC transmission systems have appeared in recent years. For example, China's East China Power Grid and Guangdong Power Grid both contain 5 external interconnected DCs, which have become typical multi-DC transmission feed-in power systems. In the next few years, more regional power grids in large power grids will gradually develop into multi-DC interconnec...

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Problems solved by technology

[0006] The present invention provides a steady-state frequency control method for multiple direct current transmission feed-in power systems, which solves the problem that in the prior art, it is impossible to realize the coordinated optimization control of multiple direct currents in the area, which makes it difficult for the behaviors of various direct currents to cooperate with each other There are even conflicting technical problems, and the technical effect of optimal coordination control between multiple DCs is realized.

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