Flexible direct current transmission system power coordination control method

Abstract

The invention discloses a flexible direct current transmission system power coordinate control method. When a DC voltage control station has a possibility or risk of voltage instability, whether the DC voltage control station can be communicated with an active power control station or a frequency control station or not is determined, and a circumstance that the active power control station changes the power actively or that the frequency control station changes the frequency actively is realized respectively under a condition that the DC voltage control station is communicated with the active power control station or the frequency control station and a condition that the DC voltage control station is not communication with the active power control station or the frequency control station, thereby actively changing the transmitted active power, and maintaining the DC voltage stability. The flexible direct current transmission system power coordinate control method avoids a defect that the system loses stability in voltage or even stops operating because the DC voltage station cannot actively change the power, thereby realizing combination of active prevention and passive defense, avoiding a problem of great power and DC voltage oscillation brought about by passive defense only depending on voltage detection, and realizing accurate control for the power in communication at the same time.

Description

Technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to a flexible direct current transmission system power coordinated control method in the flexible direct current transmission power coordinated control technology. Background technique [0002] With the rapid development of voltage source converters, DC transmission systems based on voltage source converters have become the mainstream trend in the development of DC transmission systems. As a more flexible and fast power transmission method, flexible DC has broad application prospects in the grid connection of new energy sources such as wind power and the construction of urban DC distribution networks. At the same time, as the capacity of power electronic devices increases, high-voltage large-capacity flexible DC transmission has become a development trend. [0003] Two-terminal or multi-terminal flexible DC transmission must first control the DC voltage by one station t...

AI Technical Summary

Problems solved by technology

1. The current research based on both ends focuses on theory, and does not consider objective factors such as water cooling overload, temperature, and system power demand changes in actual engineering; 2. The power coordination of flexible DC transmission involved is mainly concentrated in the field of multi-terminal flexible DC transmission. There is no detailed study on the engineering application method of the two-terminal flexible DC transmission, which is the most widely used and has a greater development prospect.

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