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Optimization method of phase compensation link time constants of power system stabilizer

A phase compensation and time constant technology, which is applied to the optimization of the time constant of the phase compensation link of the power system stabilizer and the field of suppressing low-frequency oscillation of the system, can solve problems such as dependence, no intelligent optimization model, and heavy workload

Active Publication Date: 2017-03-22
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] To sum up, at present, the parameter setting of PSS4B-W power system stabilizer is still in the stage of manual adjustment, the workload is heavy and depends on the experience of debugging personnel, and there is no intelligent optimization model suitable for PSS4B-W parameter setting

Method used

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  • Optimization method of phase compensation link time constants of power system stabilizer
  • Optimization method of phase compensation link time constants of power system stabilizer
  • Optimization method of phase compensation link time constants of power system stabilizer

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Embodiment 1

[0121] For the conventional self-shunt excitation system, a group of uncompensated phase-frequency characteristics are shown in Table 2. When the frequency is above 1.4Hz, the phase lag is greater than 90°.

[0122] Table 2 Self-shunt excitation system without compensation phase-frequency characteristics

[0123]

[0124]

[0125] The PSS4B-W parameter optimization is carried out by using the adaptive weight particle swarm optimization algorithm, and the optimization parameter is: T 1 =0.209,T 2 =6.126, T 3 =5.653, T 4 =0.010, T 5 =3.095, T 6 =7.416. The corresponding phase-frequency characteristics of PSS compensation are as follows: Figure 6 , it can be seen that the phase compensation effect of PSS4B-W optimized parameters meets the requirements of industry standards in the range of 0.1-2.0Hz.

Embodiment 2

[0127] Table 3 shows the uncompensated phase-frequency characteristics of a group of measured three-machine excitation systems. It can be seen that the overall hysteresis characteristics are relatively large, and the lag is as high as 150.09° at the local oscillation frequency of 1.9Hz.

[0128]Table 3 Phase-frequency characteristics of three-machine excitation system without compensation

[0129]

[0130] The PSS4B-W parameter optimization is carried out by using the adaptive weight particle swarm optimization algorithm, and the optimization parameter is: T 1 =0.091, T 2 =0.010, T 3 =0.137, T 4 =0.010, T 5 =0.713, T 6 = 1.671. The corresponding phase-frequency characteristics of PSS compensation are as follows: Figure 7 , it can be seen that for the three-machine excitation system with large lag in phase-frequency characteristics without compensation, the optimized parameters of PSS4B-W have a better compensation effect, and meet the requirements of industry standar...

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Abstract

The invention discloses an optimization method of phase compensation link time constants of a power system stabilizer. The optimization method comprises the following steps of (1) measuring non-compensation phase-frequency characteristics of a unit excitation system by adopting a dynamic signal analyzer on the spot and reading a phase angle within a range of 0.1-2.0Hz; (2) converting the power system stabilizer into the PSS of a rotating speed deviation single-input mode according to structure characteristics of an electric power and rotating speed deviation double-input signal of a PSS4B-W; and (3) building a parameter optimization model of the PSS4B-W by employing third-order lead-lag phase compensation link time constants of the PSS4B-W as optimization variables and in-phase additional moment generated by the PSS and [delta]omega shaft as an optimization target and solving the time constants through an adaptive weight particle swarm optimization algorithm. According to the optimization method, optimized parameters, meeting the industry standard requirements, of the PSS4B-W can be quickly and efficiently found out.

Description

technical field [0001] The invention relates to a method for optimizing the time constant of a phase compensation link of a power system stabilizer, which belongs to the field of power system stability and control and is mainly used for suppressing low-frequency oscillation of the system. Background technique [0002] With the continuous expansion of the grid scale, regional grid interconnection has become the development trend of the modern power system. The commissioning of long-distance large-capacity transmission lines and fast, high-gain excitation systems has made low-frequency oscillation a key issue affecting the transmission capacity of interconnected grids. Among the low-frequency oscillation suppression measures, the power system stabilizer (PSS) has the advantages of clear concept, simple structure and good effect, and has been widely used at home and abroad. Since the first PSS was put into industrial application in 1969, the mathematical model of PSS has exper...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/002H02J3/24H02J2203/20
Inventor 郭思源陈宏刘海峰洪权李振文蔡昱华吴晋波李大公李理
Owner STATE GRID CORP OF CHINA
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