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Power system broadband oscillation protection method and system

A power system and broadband technology, applied in the field of power system broadband oscillation protection, can solve the problems of off-grid power and loss of fans, and achieve the effect of improving stability and reducing off-grid accidents.

Active Publication Date: 2021-03-02
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, broadband oscillation protection is mainly in the following aspects: 1) Adding hardware circuits or changing control strategies, such as: connecting a converter in series in the fan controller as an impedance eliminator to eliminate the impact of grid impedance on system stability 2) New energy power stations are generally equipped with reactive power compensation equipment such as SVG (Static Var Generator), so the oscillation suppression method is set in the SVG controller; 3) At present, machine cutting is generally used in actual projects Protection, changing the system operation mode and strengthening the grid structure and other methods, the advantage of machine cut-off protection is that it can quickly suppress the oscillation, and the disadvantage is that it will cause the fan to go off-grid and power loss

Method used

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  • Power system broadband oscillation protection method and system
  • Power system broadband oscillation protection method and system
  • Power system broadband oscillation protection method and system

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Embodiment 1

[0040] Such as figure 1 As shown, this embodiment provides a power system broadband oscillation protection method, including the following steps:

[0041] 1) Collect the three-phase voltage and three-phase current of the line at the collection line of the wind turbine in the wind farm in real time, and calculate the broadband oscillation power of the line in real time based on the dynamic time window. Oscillation power S WO for:

[0042]

[0043] Among them, i a [k], i b [k] and i c [k] is the three-phase current sampling signal of the line at the wind turbine collection line of the wind farm; k is the sampling point sequence; N is the number of 1Hz cycle sampling points; n is the broadband frequency, M=49; u a [k],u b [k] and u c [k] is the three-phase voltage sampling signal of the line at the wind turbine collection line of the wind farm; j is the imaginary number unit; T means transpose.

[0044] 2) According to the three-phase voltage and three-phase current co...

Embodiment 2

[0057] Such as figure 2 As shown, this embodiment provides a power system broadband oscillation protection system, which is set at the collection line of wind turbines in a wind farm, including:

[0058] The power calculation module is used to collect the three-phase voltage and three-phase current of the line at the collection line of the wind turbine in the wind farm in real time, and calculate the broadband oscillation power of the line in real time based on the dynamic time window. When the broadband oscillation frequency in the range of 1 to 49Hz When the change occurs, the power calculation module may not be affected by the frequency change.

[0059] The parameter calculation module is used to calculate the maximum broadband oscillation power of the line and the broadband oscillation dominant modal impedance of the line according to the three-phase voltage and three-phase current collected in real time.

[0060] The protection action judgment module is used to cut off ...

Embodiment 3

[0065] This embodiment provides a processor, including computer program instructions, wherein, when the computer program instructions are executed by the processor, they are used to implement the steps corresponding to the above-mentioned power system broadband oscillation protection method.

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Abstract

The invention relates to a power system broadband oscillation protection method and system. The power system broadband oscillation protection method is characterized by comprising the following stepsof: 1) collecting three-phase voltage and three-phase current of a line at a wind turbine generator collection line of a wind power plant in real time, and calculating the broadband oscillation powerof the line in real time based on a dynamic time window; 2) calculating the maximum broadband oscillation power of the line and the broadband oscillation dominant modal impedance of the line accordingto the three-phase voltage and the three-phase current which are acquired in real time; and 3) based on the broadband oscillation protection action criterion, according to the calculated broadband oscillation power of the line, the maximum broadband oscillation power of the line and the broadband oscillation dominant modal impedance of the line, and cutting off the wind turbine generator participating in oscillation to complete the protection of broadband oscillation of the power system. The power system broadband oscillation protection method can be widely applied to the technical field of power systems.

Description

technical field [0001] The invention relates to a power system broadband oscillation protection method and system, and belongs to the technical field of power systems. Background technique [0002] Nowadays, a large number of wind turbines using power electronic converters are connected to the grid, which often causes unstable subsynchronous oscillations in the power system, seriously affecting the stable operation of the power grid. At present, a wide-band oscillation protection system can be installed in the line. When the output power of the wind turbine oscillates, by cutting off the unit that caused the oscillation, the further expansion of the oscillation can be suppressed, thereby preventing the occurrence of large-scale wind turbine off-grid accidents. [0003] At present, broadband oscillation protection is mainly in the following aspects: 1) Adding hardware circuits or changing control strategies, such as: connecting a converter in series in the fan controller as a...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/381H02J2300/28Y02E40/10
Inventor 马为民李军刘颖申洪明董力通肖智宏吴新平张旭王紫琪程红张祥龙陈炜王海猷卢其威刘文轩冯腾
Owner STATE GRID CORP OF CHINA
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