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Regional power grid active power imbalance measuring method

A technology of regional power grid and measurement method, applied in the direction of measurement device, measurement of electrical variables, measurement of electrical power, etc.

Active Publication Date: 2015-12-30
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no convenient and efficient method for measuring the unbalanced amount of active power in the regional power grid in the prior art

Method used

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  • Regional power grid active power imbalance measuring method
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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0013] The method for measuring the active power imbalance of the regional power grid in the embodiment of the present invention includes the following steps:

[0014] (1) Measure the frequency change rate df of each generator i in the regional power grid before and after the disturbance i / dt, and then calculate the active power imbalance ΔP of each generator i i .

[0015] Measure the frequency change rate of each generator i in the regional grid before and after the disturbance, df i / dt represents the frequency change rate of 40ms after the disturbance, through the formula Calculate the active power unbalance ΔP of each generator i i . Among them, f n is the rated frequency of the system, T i is the inertia time constant of the i-th generator, S i is the rated capacity of the i-th generator.

[0016] (2) Measure the transmission power P before t...

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Abstract

The invention relates to a regional power grid active power imbalance measuring method. The method includes the following steps that: (1) the active power imbalance quantity delta Pi of each generator i in a regional power grid is measured; (2) pre-disturbance power transmission Pl0 and post-disturbance power transmission Pl1 of each connecting line l of the regional power grid and an external power grid are measured, and active power change Delta Pl of each connecting line l is calculated through the expression that Delta Pl=(Pl1-Pl0); and (3) the active power imbalance quantity delta P of the regional power grid is calculated through a formula mentioned in the descriptions of the invention. According to the method, the active power imbalance quantity of the regional power grid is calculated in real time through measuring the frequency change rate of all the generators in the regional power grid and the change of the power transmission of all the connecting lines of the regional power grid and the external power grid before and after the disturbance of a power system, and therefore, the operating state of the regional power grid can be mastered on the whole, references can be provided for the next step of control measures, and basis is provided for the execution of measures such as generator switching and load reduction of the regional power grid, and a guarantee can be provided for the safe and stable operation of the power system.

Description

technical field [0001] The invention belongs to the field of electric system frequency and active power response, and in particular relates to a method for measuring the active power unbalance of a regional power grid. Background technique [0002] The primary task of the power system is to maintain the balance between supply and demand of electric energy. When the power system has an active power imbalance due to disturbance, it will affect the frequency, voltage and power angle stability of the power system. Obtaining the active power unbalance of the power system is a prerequisite for operations such as machine cut-off, unloading, and load shedding. At present, the operations of system shutdown, deserialization, and load reduction are mainly based on local response information, and actions are performed according to the pre-set policy table, lacking a grasp of the status of the entire system, and may not be able to effectively guarantee the safe and stable operation of th...

Claims

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Application Information

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IPC IPC(8): G01R21/00
Inventor 李晔薄志谦张鹭王庆平张保会赵颖科牟颖马晓伟王林
Owner XUJI GRP