Isolated network operation under-frequency load shedding parameter setting method and system

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

Active Publication Date: 2014-01-29
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 ...

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  • Isolated network operation under-frequency load shedding parameter setting method and system
  • Isolated network operation under-frequency load shedding parameter setting method and system
  • Isolated network operation under-frequency load shedding parameter setting method and system

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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 an isolated network operation under-frequency load shedding parameter setting method and system. The method includes the steps of acquiring relevant data in a power system, utilizing a platform of an electromechanical transient simulation program for simulating to obtain system speed deviation and mechanical power change when an isolated network is formed, extracting generator dynamic frequency adjustment effect coefficients, load adjustment effect coefficients and system frequency adjustment effect coefficients, and calculating a load shedding value of corresponding setting action frequency of each generator in the isolated network and an introduced restoration-level under-frequency load shedding value. In the whole under-frequency load shedding parameter setting process, dynamic frequency differences among regional power networks due to difference of power network structures are considered comprehensively, spatial differences of dynamic frequency characteristics are reflected, results obtained via calculation are accurate and high in reliability, an efficient and precise method is provided for under-frequency load shedding setting, an existing parameter setting method is enabled to be improved greatly, the method and the system are applicable to power networks in different power network structures and of multi-computer systems, application range is enlarged, and isolated network operation capability is enhanced.

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...

Claims

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Application Information

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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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