Computing method for improving small signal stability and providing aid decision making

A technology that is stable with small disturbances and assists decision-making. It is applied in the direction of single-network parallel feeding arrangement, etc., which can solve problems such as low-frequency oscillation, and achieve the effect of ensuring safe and stable operation and improving the stability of small disturbances.

Active Publication Date: 2012-11-28
NARI TECH CO LTD
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Problems solved by technology

Although the power system stabilizer (PSS) can enhance the system damping and suppress the low-frequency oscillation of the power grid, when the operation mode of the power system changes greatly or a large fault occurs, the operating point of the system may exceed the design range of the PSS, and there may still be low frequency oscillation

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  • Computing method for improving small signal stability and providing aid decision making
  • Computing method for improving small signal stability and providing aid decision making
  • Computing method for improving small signal stability and providing aid decision making

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Embodiment Construction

[0021] Attached below figure 1 , the method of the present invention is described in detail.

[0022] figure 1 The control measure described in step 1 is to avoid increasing the damping of the weakly damped mode from deteriorating close to the damping safety threshold σ safe_thres Mode damping of , set a value greater than σ safe_thres The damping threshold σ of thres , filter out the damping less than σ thres mode.

[0023] figure 1 The description in step 2 is based on the participation factor threshold p thres , select the participation factor greater than p thres The unit participates in the control; with the mode vector u i The element with the largest amplitude is used as a reference to calculate the modal phase angle argu corresponding to each unit ji ;Set the angle threshold α thres , argu ji The absolute value is in [0, α thres ) within the scope of the unit is S group, argu ji The absolute value of [α thres , 180] The units within the range are group A....

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Abstract

The invention discloses a computing method for improving small signal stability and providing aid decision making, which is suitable for computation of output power adjustment measures of units for improving a plurality of dampers in weak damping modes under the determined mode of operation. The method is characterized by considering the weak damping modes and the modes close to safe damping threshold while determining the coordination control properties of the units, selecting the units with larger participation factors in the weak damping modes to participate in output power adjustment, dividing the units participating in output power adjustment into two groups according to the unit mode information in each mode, determining the output power adjustment directions of the two groups of units by a method of perturbation of power, determining the output power adjustment directions during coordination control by combining the participation factors and the output power adjustment directions of the units in different modes, computing the output power adjustment measures of the units for improving the dampers in the single mode by a sensitivity method, checking the combined control measures by computing the eigenvalues in the given range to determine the effectiveness of the control measures and giving the output power adjustment measures of the units for coordination control of a plurality of weak damping modes.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method for calculating unit output adjustment measures for improving small disturbance stability. Background technique [0002] The geographical distribution of energy resources and power demand is increasingly uneven, making the demand for long-distance large-capacity transmission of power increasing. In the past few years, my country's power system has experienced the rapid development of regional power grid interconnection. When the power grid structure is constant, the greater the transmitted power, the more prone to low-frequency oscillations in the power grid. Although the power system stabilizer (PSS) can enhance the system damping and suppress the low-frequency oscillation of the power grid, when the operation mode of the power system changes greatly or a large fault occurs, the operating point of the system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
Inventor 鲍颜红徐伟徐泰山郑伟杨卫东方勇杰薛禹胜
Owner NARI TECH CO LTD
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