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A source-network coordinated power system low-frequency oscillation control method

A power system, low-frequency oscillation technology, applied to AC network circuits, reducing/preventing power oscillation, circuit devices, etc., can solve the problems of complex low-frequency oscillation mechanism, affecting the safe and stable operation of the power system, and disturbing the interconnection of large-scale power grids

Active Publication Date: 2019-08-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the interconnection of the power grid, the mechanism of low frequency oscillation is more complicated
In the actual power system, the AC synchronous interconnection grid appeared, and the low-frequency oscillation phenomenon appeared after the DC asynchronous interconnection, which seriously affected the safe and stable operation of the power system and became one of the key technological issues that plagued the interconnection of large-scale grids.

Method used

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  • A source-network coordinated power system low-frequency oscillation control method
  • A source-network coordinated power system low-frequency oscillation control method
  • A source-network coordinated power system low-frequency oscillation control method

Examples

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Embodiment Construction

[0106] Taking a typical four-machine two-zone system as an example, the system has four turbogenerators with a capacity of 900MVA; the steam turbine adopts a three-cylinder single-reheater model structure, and the power coefficient of the high-pressure cylinder is F HP Take 0.3, medium pressure cylinder power coefficient F IP Take 0.4, low-pressure cylinder power coefficient F LP Take 0.3; the governor adopts power-frequency electro-hydraulic control system, with power load unbalance (PLU) detection and intermediate regulating valve (IV) trigger function; excitation system adopts self-excitation excitation mode, power system stabilizer (PSS) Angular velocity deviation and power deviation are used as input, and the load adopts a constant impedance load model. Select the following control parameters as parameters to be optimized: excitation regulator amplification factor K A and time constant T A , power system stabilizer gain K STAB and time constant T 1 , T 1 , the propo...

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Abstract

The invention relates to the safe and stable operation of an electric power system and discloses a method for preventing and controlling the low frequency oscillation of a power system with synergy between a power source and a power grid. According to the method, the influences of power source side unit control system parameters and power grid side structure and operation mode changes on the dynamic stability of the power system are considered comprehensively, and the dynamic stability level of the power system is improved through a mode of the synergy between the power source and the power grid. When a power grid structure or an operation mode changes, the unit control system parameters are reset through a genetic optimization algorithm, and low frequency power oscillation caused by no synergy between the power source and the power grid can be effectively prevented.

Description

technical field [0001] The application belongs to the technical field of electric power security and stability control, and in particular relates to a method for preventing and controlling low-frequency oscillation of a power system with coordinated source and network. Background technique [0002] The low-frequency power oscillation of the power system refers to the relative swing between the rotors of the generator set, and the power oscillation of the transmission line. The frequency is generally 0.1-2.5Hz, so it is called low-frequency oscillation. Low-frequency oscillation is usually caused by negative damping introduced by modern fast excitation systems, which causes amplified oscillations after system disturbances. The low-frequency oscillation phenomenon caused by the excitation system can be effectively eliminated by applying the power system stabilizer for phase compensation correction. However, with the rapid development of the power system, there are more and mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/46
CPCH02J3/24H02J3/46H02J2203/20
Inventor 徐衍会李真伍双喜杨银国
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)