Turbo generator unit force oscillation detection and control method and system

Abstract

The invention discloses a turbo generator unit force oscillation detection and control method and system. The turbo generator unit force oscillation detection and control method comprises the steps ofmeasuring the rotating speed of a turbo generator unit and power grid frequency in real time; calculating the difference value between the rotating speed of the turbo generator unit and the corresponding rotating speed of the power grid frequency; judging whether the difference value between the rotating speed of the turbo generator unit and the corresponding rotating speed of the power grid frequency exceeds the set value or not, and if the difference value exceeds the set time, beginning to carry out timing and carrying out counting; when the time number that the difference value exceeds the set value is up to the set time number, considering that the turbo generator unit is being in oscillation, sending primary frequency modulation exiting and coordination control mode instructions tothe turbo generator unit, and giving out an alarm signal; and if the difference value in one minute cannot be up to the set time number, carrying out counting again. Force oscillation can be detected,and can be prevented from continuously happening, and the danger of long-time oscillation of the turbo generator unit to the unit safety can be prevented.

Description

technical field

[0001] The invention relates to the field of low-frequency oscillations in electric power systems, in particular to a detection and control method and system for forced oscillations that occur when a steam turbine generator set is disturbed. Background technique

[0002] In recent years, with the continuous evolution of the grid structure of the power system, a large number of AC and DC UHV long-distance transmission projects have been put into operation, and large-scale grid-connected new energy generating units have caused frequent occurrence of low-frequency oscillation events in my country's power system. Power system low-frequency oscillation refers to a power angle stability problem that occurs when the power system is disturbed. It usually manifests as frequency oscillation of active power below 2.5Hz. If the oscillation amplitude does not converge, it will threaten the safety of the power system. In severe cases, it will lead to the collapse of the po...

Examples

Embodiment 1

[0045] This embodiment provides a forced oscillation detection and control method of a turbogenerator set, the flow chart and SAMA diagram are as follows figure 1 , figure 2 As shown, it includes the steps:

[0046]1) Real-time measurement of turbine generator speed and grid frequency;

[0047] 2) Calculate the difference Δn between the speed of the turbo-generator set and the speed corresponding to the grid frequency;

[0048] 3) Judging whether the difference Δn between the speed of the turbo-generator unit and the speed corresponding to the grid frequency exceeds the set value n 0 , if it exceeds the set value n 0 Then start timing and counting;

[0049] 4) When the difference Δn exceeds the set value n within one minute 0 The number of times reaches the set number i 0 times, that is, it is considered that the turbo-generator set is undergoing forced oscillation, and the turbo-generator set is issued a command to exit the frequency modulation and coordinated control ...

Embodiment 2

[0058] This embodiment provides a forced oscillation detection and control system of a steam turbine generator set, such as Figure 5 shown, which includes:

[0059] The rotational speed measurement module is used to measure the rotational speed of the turbogenerator set in real time and output it to the rotational speed difference calculation module;

[0060] The power grid frequency measurement module is used to measure the power grid frequency in real time and output it to the speed difference calculation module;

[0061] The speed difference calculation module is used to calculate the difference between the speed of the turbogenerator set and the speed corresponding to the grid frequency, and input it to the judgment module;

[0062] Judgment module, used to judge whether the difference Δn reaches the set value n 0 , if it exceeds the set value n 0 Then the timing and counting module performs timing and counting; if it does not exceed the set value n 0 Then return to t...

technical field

[0001] The invention relates to the field of low-frequency oscillations in electric power systems, in particular to a detection and control method and system for forced oscillations that occur when a steam turbine generator set is disturbed. Background technique

[0002] In recent years, with the continuous evolution of the grid structure of the power system, a large number of AC and DC UHV long-distance transmission projects have been put into operation, and large-scale grid-connected new energy generating units have caused frequent occurrence of low-frequency oscillation events in my country's power system. Power system low-frequency oscillation refers to a power angle stability problem that occurs when the power system is disturbed. It usually manifests as frequency oscillation of active power below 2.5Hz. If the oscillation amplitude does not converge, it will threaten the safety of the power system. In severe cases, it will lead to the collapse of the po...

Examples

Embodiment 1

[0045] This embodiment provides a forced oscillation detection and control method of a turbogenerator set, the flow chart and SAMA diagram are as follows figure 1 , figure 2 As shown, it includes the steps:

[0046]1) Real-time measurement of turbine generator speed and grid frequency;

[0047] 2) Calculate the difference Δn between the speed of the turbo-generator set and the speed corresponding to the grid frequency;

[0048] 3) Judging whether the difference Δn between the speed of the turbo-generator unit and the speed corresponding to the grid frequency exceeds the set value n 0 , if it exceeds the set value n 0 Then start timing and counting;

[0049] 4) When the difference Δn exceeds the set value n within one minute 0 The number of times reaches the set number i 0 times, that is, it is considered that the turbo-generator set is undergoing forced oscillation, and the turbo-generator set is issued a command to exit the frequency modulation and coordinated control ...

Embodiment 2

[0058] This embodiment provides a forced oscillation detection and control system of a steam turbine generator set, such as Figure 5 shown, which includes:

[0059] The rotational speed measurement module is used to measure the rotational speed of the turbogenerator set in real time and output it to the rotational speed difference calculation module;

[0060] The power grid frequency measurement module is used to measure the power grid frequency in real time and output it to the speed difference calculation module;

[0061] The speed difference calculation module is used to calculate the difference between the speed of the turbogenerator set and the speed corresponding to the grid frequency, and input it to the judgment module;

[0062] Judgment module, used to judge whether the difference Δn reaches the set value n 0 , if it exceeds the set value n 0 Then the timing and counting module performs timing and counting; if it does not exceed the set value n 0 Then return to t...

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