AGC rapid control method adapted to big receiving end provincial power grid

Abstract

The invention discloses an AGC rapid control method adapted to a big receiving end provincial power grid, and the method comprises the steps: building an AGC control model and a rapid control relatedmodel at a dispatching center, and monitoring the disturbance condition of the power grid in real time; calling the remaining units of a plant and other units in a subregion if a unit tripping disturbance accident happens to the power grid. If a cross-region DC locking disturbance accident happens to the power grid, a pumping and storage unit in a water pumping state is automatically switched to ahalt state at first, and the remaining power shortage is adjusted by the pumping and storage, water power and common units in the subregion. When a big power reduction disturbance fault happens to the power grid, a high-rate unit which is close to the unit is called at first for power support, thereby guaranteeing the overall power balance of the power grid, giving consideration to the operationsafety of an internal section of the power grid, and avoiding the large-range transfer support of power.

Description

technical field [0001] The invention relates to an AGC (Automatic Generation Control, automatic generation control) fast control method adapted to a provincial power grid at a large receiving end, and belongs to the technical field of power system active power control. Background technique [0002] At present, for the AC-DC UHV regional power grid, especially the multi-DC feed-in and UHV AC-DC receiving end power grid in the region, any failure of the DC system and the UHV tie line will have a negative impact on the power flow control and frequency security of the power grid. On the one hand, when a blocking fault occurs in the UHV DC outside the area, the large power loss caused by it will cause a large drop in the operating frequency of the power grid. In the process of frequency recovery, the large-scale transfer of inter-provincial power flow in the network caused by the high-power support of the units in the network will not only cause problems of inter-provincial power...

AI Technical Summary

Problems solved by technology

[0002] At present, for the AC-DC UHV regional power grid, especially the multi-DC feed-in and UHV AC-DC receiving end power grid in the region, any failure of the DC system and the UHV tie line will have a negative impact on the power flow control and frequency security of the power grid.

On the one hand, when a blocking fault occurs in the UHV DC outside the area, the large power loss caused by it will cause a large drop in the operating frequency of the power grid

In the process of frequency recovery, the large-scale transfer of inter-provincial power flow in the network caused by the high-power support of the units in the network will not only cause problems of inter-provincial power flow and section control, but also have an impact on UHV AC transmission lines

[0003] On the other hand, since the UHV line forms an electromagnetic ring network with the power grid of the next voltage level, when the UHV AC transmission line fails, the transmission power of the UHV tie line will be transferred to the 500kV transmission line or even the 220kV transmission line in large quantities. Further lead to severe overloading of the line, seriously threatening the safety of power grid operation

[0004] In addition, if the power transfer of UHV tie-lines causes the transmission power of inter-provincial tie-lines to approach its transmission limit, it may also affect the power exchange of tie-lines in inter-provincial power grids, hindering the smooth completion of inter-provincial tie-line power transactions

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