Control method, device and storage medium for inter-electrode power of three-terminal hybrid direct current

Abstract

The invention discloses a method for controlling the inter-electrode power of a three-terminal hybrid direct current, comprising: using a first flexible direct current terminal and a second flexible direct current terminal to simultaneously control the voltage of a direct current bus and the reactive power exchanged between the local terminal and an AC system; Calculate the total active power value that needs to be transmitted by the DC healthy pole after unipolar blocking; obtain the first droop control curve and the second droop control curve; The relationship of the active power value controls the transmission power between the poles through the first droop control curve and the second droop control curve. The invention discloses a method for controlling the inter-pole power of a three-terminal hybrid direct current, which can still realize rapid inter-pole power transfer of a three-terminal hybrid direct current in a peer-to-peer control mode when a single-pole blocking fault occurs in a three-terminal hybrid direct current . The invention also discloses a device and a storage medium.

Description

technical field [0001] The present invention relates to the technical field of operation, analysis and dispatching of electric power systems, in particular to a method, device and storage medium for controlling the inter-electrode power of three-terminal hybrid direct current. Background technique [0002] With the development of power system technology and the expansion of the scale of external power transmission, the multi-terminal hybrid DC transmission technology will also be put into use in the 500kV power grid. The input operation characteristics are more complex, and the new multi-terminal hybrid DC control mode is diverse, and the control logic switching process is more complicated. [0003] In the prior art, the new multi-terminal hybrid DC control mode is applied to the Kunliulong DC sending terminal, and its structure diagram is as follows figure 1 As shown, the sending end of Kunliulong DC is conventional DC (LCC), and the two receiving ends are flexible DC (VSC...

AI Technical Summary

Problems solved by technology

In the peer-to-peer mode, the VSCs at the Guangdong end and Guangxi end distribute power through a drooping curve, and the distribution coefficient is usually fixed. If unipolar blocking occurs, the VSCs at the Guangdong end and Guangxi end will increase the forwarding power synchronously according to a fixed ratio. Power, unable to achieve the control target of Guangdong end to give priority to increasing power

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