Power system stabilizer with optimal control of simulation state quantity

A power system and stabilizer technology, applied in the direction of reducing/preventing power oscillation, etc., to achieve the effect of suppressing low-frequency oscillation

Inactive Publication Date: 2016-01-06
STATE GRID SHANDONG LINQU POWER SUPPLY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The feature of the present invention is that it solves the problem of low-frequency oscillation of the power system without the need for direct measurement of the complex additional feedback, and only uses the ready-made voltage deviation to realize the full-state optimal control of the variable gain

Method used

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  • Power system stabilizer with optimal control of simulation state quantity
  • Power system stabilizer with optimal control of simulation state quantity
  • Power system stabilizer with optimal control of simulation state quantity

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing and two embodiments, illustrate the adjustment of the constitution type of the analog circuit of said emulation state quantity of the present invention, then obtain angular frequency deviation Δω, power deviation ΔP, power deviation Δδ through resistance (20) , (21), (22), (23) and the total adder that operational amplifier (24) constitutes, after above-mentioned potentiometer (17), (18), (19) is adjusted by optimal control theory calculation method, namely An output of the simulated state quantity is available at an output (26).

[0011] The formation type of the simulation state quantity stabilizer of type two is: voltage deviation ΔV is input on resistance (27), through the inverter that resistance (27), (28), (30) and operational amplifier (29) constitute, Then through resistance (32), electric capacity (31), operational amplifier (33), and resistance (34), (41), (44), (46), electric capacity (39) operational amplifier ...

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Abstract

The invention is an automatic device for suppressing low-frequency oscillation of a power system. A power system stabilizer is formed by an electronic line merged into an original excitation regulator, the line can convert inputted voltage deviation delta V to simulation state quantities of angular frequency deviation delta omega, power deviation delta rho, and power-angle deviation delta delta, and sum output is realized according to the optimal control principle. By adopting the power system stabilizer, the output ability of a power plant for long-distance power transmission can almost be doubled, a whole set of detection and feedback apparatuses can be cancelled, distortion brought by measurement is avoided, and compared with the prior art, the power system stabilizer is advantaged by small size, low cost, simple installation, and high reliability etc.

Description

technical field [0001] The invention is an automatic device for suppressing low-frequency oscillation occurring in a power system. Background technique [0002] Fast excitation systems and regulators are widely used on generators in power systems to improve operating quality and increase the ability to transmit electric power over long distances. However, since the thyristor excitation system and other fast excitation control systems were adopted, when the transmission power of the generator in the power system rises to a power angle of about 60 degrees, low-frequency oscillations affecting the entire power system will appear. Therefore, it becomes a technical problem to be solved in the power system. [0003] In the prior art, in order to overcome the phenomenon of low-frequency oscillation, two measures, such as power system stabilizer (P.S.S) and excitation optimal control, are mainly adopted. What these two measures have in common is that it is impossible to achieve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 许朋波王孝帅高振江李军马继柏刘晓霞李翔冯勇梅平
Owner STATE GRID SHANDONG LINQU POWER SUPPLY
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