Accelerated power type electric power system stabilizer

A power system, power acceleration technology, applied in the control system, reducing/preventing power oscillation, electrical components, etc., can solve the problem that the generator shaft speed is not easy to measure and so on

Inactive Publication Date: 2009-04-29
CHINA ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By measuring the generator voltage U and the stator current I, the internal potential Eq of the generator can be obtained, and the shaft speed of the generator can be obtained by calculating the

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  • Accelerated power type electric power system stabilizer
  • Accelerated power type electric power system stabilizer
  • Accelerated power type electric power system stabilizer

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Embodiment Construction

[0034] The implementation manner of the present invention will be described below in conjunction with a specific example and the accompanying drawings.

[0035] In August 2003, the first unit of the Three Gorges Power Plant was connected to the grid for power generation, and then another 5 units were commissioned successively and required to be connected to the grid and put into commercial operation. The theoretical analysis, field test and power system simulation calculation of the PSS1A and PSS3B models and parameters provided by Siemens have been carried out, and the following main problems have been found: 1) Not only can not provide positive damping for the interregional oscillation mode with a frequency lower than 0.3Hz, On the contrary, it will provide negative damping; 2) The phenomenon of "reverse adjustment" of generator reactive power is so serious that it cannot be tolerated. attached Figure 4 The wave recording diagram when the active power of the generator incr...

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Abstract

The invention provides a boost horsepower type power system stabilizer based on potential frequency in a generator. Adoption of double input signal boost horsepower consisting of generator shaft speed and active power is an effective measure to solve generator reactive power 'contra harmony', but a rotating speed signal is difficult to be measured; a torsion frequency block filter is adopted to avoid shafting torsional oscillation. In the invention, potential frequency in the generator calculated by line voltage and current of the generator is used to replace the generator shaft speed, as variation of the generator shaft speed is the same as the variation of potential frequency in the generator. Potential Eq in the generator can be calculated by measuring voltage U of the generator and current I of a stator, therefore, the generator shaft speed can be obtained by calculating the potential frequency in the generator so as to solve the problem that the generator shaft speed is difficult to be measured without attaching an active power inverter and a rotating speed inverter.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to an accelerated power type power system stabilizer based on the potential frequency in a generator. Background technique [0002] The research of the national networking project shows that after the national networking, there will be a negative damping oscillation mode with a frequency of about 0.15Hz, which will seriously affect the safety, stability and economic operation of the power grid. A power system stabilizer (PSS) that uses a single electric power as the input signal (or a simple electric power acceleration speed signal), after adopting parameters that can provide positive damping for low-frequency oscillations in the frequency range of 0.1-2.0Hz, will often make the "reverse adjustment" "The phenomenon became serious. The so-called "reverse adjustment" means that when the unit increases the power input of the prime mover, the reactive power of the generator wil...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02P9/00
Inventor 王亮刘增煌晁晖赵红光朱方吴余泉
Owner CHINA ELECTRIC POWER RES INST
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