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Method and system for parameter setting of low-frequency load shedding in isolated grid operation

A low-frequency load shedding and parameter tuning technology, applied in the field of power grid, can solve problems such as low reliability

Active Publication Date: 2016-06-08
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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Problems solved by technology

[0005] Based on this, it is necessary to provide a highly reliable low-frequency load shedding parameter setting method and system for isolated grid operation in view of the low reliability of the low-frequency load shedding parameter setting method for isolated grid operation

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  • Method and system for parameter setting of low-frequency load shedding in isolated grid operation
  • Method and system for parameter setting of low-frequency load shedding in isolated grid operation

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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below according to the drawings and embodiments. It should be understood that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

[0022] The basic idea of ​​the low-frequency load shedding parameter setting method for isolated grid operation in the present invention is to extract the frequency adjustment effect coefficients of generators, loads and power systems corresponding to each operating frequency based on the transient response trajectory of the disturbed grid, and calculate the frequency adjustment effect coefficient corresponding to the operating frequency grid power shortage, and then calculate its load shedding.

[0023] Such as figure 1 As shown, a method for setting parameters of low-frequency load shedding in isolated grid ope...

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Abstract

The invention provides a method and system for setting low-frequency load-shedding parameters in isolated grid operation, which obtains relevant data in the power system, uses the platform of the electromechanical transient simulation program, simulates the system speed deviation and mechanical power change when the isolated grid is formed, and extracts the generator Dynamic frequency regulation effect coefficient, load regulation effect coefficient and system frequency regulation effect coefficient, calculate the load shedding value corresponding to the setting action frequency of each generator in the isolated grid and the introduced recovery level low frequency load shedding value. The entire low-frequency load shedding parameter setting process comprehensively considers the frequency dynamic differences caused by the different grid structures between regional power grids, reflects the spatial differences of frequency dynamic characteristics, and the calculation results are highly reliable and accurate, providing a basis for low-frequency load shedding tuning. An efficient and accurate method greatly improves the existing parameter setting methods, is applicable to power grids with different grid structures and multi-machine systems, expands the scope of application, and improves its isolated grid operation capability.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method and system for setting low-frequency load shedding parameters in isolated grid operation. Background technique [0002] When local grid failures, extreme weather, or human error occur in large-scale cross-regional interconnected grids, it may lead to large-scale power outages, the ability of the system to maintain frequency stability continues to decline, and even lead to system collapse. After the power grid accident, black start is a last resort for self-rescue means, and its economic loss is huge; while isolated grid operation is an active preventive measure to prevent problems before they happen, and the unit operating in isolated grid has the ability to resist grid accidents. In the event of a power grid failure, if predetermined and reasonable decoupling measures can be taken for the regional power grid with local power plants, these units can be used to immedi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 金格冯永新邓少翔徐广文
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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