Method and system for controlling one-time frequency modulation

Abstract

The invention relates to a method and a system for controlling one-time frequency modulation. The method comprises the following steps of: judging whether an overspeed protection controller (OPC) action or a power load unbalance (PLU) action appears in a turbine set or not, if so, cutting off a power control loop of a one-time frequency modulation control loop, inputting a valve position instruction and outputting a valve position control loop door-regulating instruction. By the method and the system, the power control loop in the one-time frequency modulation control loop can be timely cut off when isolated network operation appears in a region grid, and the frequency stabilizing level of operation of the region isolated network is improved.

Description

technical field [0001] The present invention relates to the technology of primary frequency regulation of generating sets, in particular to the technology of primary frequency regulation of generating sets when the power grid is running in isolation, and in particular to the primary frequency regulation control method and system. Background technique [0002] When the power grid is running, due to local power grid failures, extreme weather or geological disasters, and human error, the power grid in areas that are weakly connected with the main grid may be disconnected from the main grid, resulting in isolated grid operation. When the isolated grid is running, the system frequency changes drastically. If the control measures are not appropriate, large-scale power outages are likely to occur. [0003] The focus of research on isolated grid operation tends to adjust the frequency of the isolated grid to maintain it near the rated frequency. The primary frequency regulation cir...

AI Technical Summary

Problems solved by technology

The changes of electromagnetic power 1 and mechanical power 2 in the dynamic process are as follows figure 2 As shown, the electromagnetic power first increases and then decreases, rather than the ideal direct decrease, which will exacerbate the imbalance between electromagnetic power and mechanical power, resulting in a more serious frequency rise, such as image 3 shown

If the uploading power continues to increase, the electromagnetic power mutation will increase, and the electromagnetic power reverse adjustment value will also increase during the dynamic process of frequency modulation control loop control, resulting in an increase in the frequency of the isolated network. The high frequency problem is serious, and it is easy to trigger OPC. action, causing damage to the stability of the power system

And because the power feedback control always exists, the power grid will not be stable after the OPC action, such as Figure 4 shown

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