Multi-direct-current urgent coordination control method based on sensitivity

Abstract

The invention discloses a multi-direct-current urgent coordination control method based on sensitivity. The method includes the following steps of: (1) obtaining current grid net rack topology data and power magnitudes of each direct current from an energy management system (EMS) and forming real-time computing data, (2) obtaining sensitivities of other direct current urgent power-raising values in improving stability of a leading (the first loses stability) unit at the sending terminal through calculating on-line when each direct current breaks down, and ordering the sensitivities to obtain a multi-direct-current urgent coordination control strategy table, (3) continuously conducting rolling computation on-line, updating the multi-direct-current urgent coordination control strategy table according to the latest sensitivity results, (4) starting direct-current urgent coordination control according to the latest direct-current urgent coordination control strategy table once direct-current blocks. The multi-direct-current urgent coordination control method based on sensitivity is capable of computing to form the control strategy table according to real-time condition of the net operation, and thus accuracy control is realized.

Description

technical field [0001] The invention belongs to the field of online safety and stability control of power grids, and is an online multi-direct current coordinated control method suitable for complex multi-direct current power grids. Background technique [0002] With the continuous expansion of the scale of my country's west-to-east power transmission, there are more and more sending-end power grids with multiple direct currents. The power grid at the sending end generally has the characteristics of underdeveloped economy, weak grid structure, and large outbound transmission of small grids. Once a DC bipolar blocking fault occurs, a large number of machines must be shut down to maintain system stability, resulting in large economic losses. [0003] For a DC multi-sending system with parallel AC tie-lines, when a DC is bipolarly blocked due to a DC fault, the blocked DC originally transmits a large amount of active power to the AC line, but the power transmitted by the AC sec...

AI Technical Summary

Problems solved by technology

At present, there is no mature multi-DC emergency coordinated control method, and the theoretical research is mainly based on the fixed strategy table obtained by offline calculation, which is difficult to adapt to the complex and changeable operation mode of the power grid.

In addition, the DC emergency boost power is also constrained by the system voltage, and the system voltage is often greatly reduced in the case of a fault. It is difficult to realize the emergency boost of DC power under the background of low voltage by traditional methods.

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