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Low-frequency low-voltage combined load shedding method

A low-frequency load shedding, low-frequency and low-voltage technology, applied in the direction of AC network voltage adjustment, power network operating system integration, information technology support systems, etc. Problems such as system frequency stability and voltage stability, inability to adapt to system operating conditions and disturbance forms

Inactive Publication Date: 2015-04-08
XI AN JIAOTONG UNIV +1
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Problems solved by technology

At present, although low-frequency load shedding and low-voltage load shedding have been widely used to avoid blackouts caused by frequency or voltage collapse, the traditional low-frequency load shedding and low-voltage load shedding are independent of each other, and the frequency and voltage after large disturbances are not fully considered. The coupling effect and the frequency and voltage characteristics of the load, and the action threshold and load shedding amount of each round of the load shedding device are fixed values, which cannot adapt to changes in the system operating conditions and disturbance forms, and it is difficult to effectively guarantee the frequency stability and voltage stability

Method used

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  • Low-frequency low-voltage combined load shedding method
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  • Low-frequency low-voltage combined load shedding method

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Such as figure 1 As shown, in the IEEE 39 node system, considering the generator voltage regulator and governor, the load adopts a power function model and makes α=1, β=1.5 in the formula (1), and the threshold value f of the low-frequency load shedding in the scheme of the present invention is Kf 49Hz, 48.8Hz, 48.4Hz, 48.2Hz, 48Hz, the corresponding load shedding ΔP Kf Both are set to 7% of the total active power of the node load. The simulation is carried out on the power system analysis and synthesis program PSASP. The form of disturbance is 0.5 seconds, the IEEE39 node system starts from figure 1 The point X shown is decoupling. After decoupling, due to the serious shortage of active power in the left isolated grid and the distance between the receiving end load and the generator, a sharp drop in frequency and voltage oc...

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Abstract

The invention relates to a low-frequency low-voltage combined load shedding method. Mainly by using frequency and voltage response information measured on a load bus, on the basis of considering the load characteristic and the frequency-voltage interactive influence, a load shedding amount of low-frequency load shedding and a load shedding amount of low-voltage load shedding are respectively calculated, the bigger one thereof is used as an actual load shedding amount, and system frequency and load voltage are restored to rated values as soon as possible after disturbance by gradually shedding the load. The low-frequency low-voltage combined load shedding method can provide a guarantee for frequency stability and voltage stability of a power system under serious disturbance.

Description

technical field [0001] The invention belongs to the technical field of low-frequency and low-voltage on-site load shedding control by using frequency and voltage information on the load side of an electric power system, and specifically relates to a low-frequency and low-voltage joint load shedding method. Background technique [0002] Frequency and voltage are important indicators to measure the power quality of the system. Frequency stability, voltage stability and power angle stability are three important aspects of system stability. At present, although low-frequency load shedding and low-voltage load shedding have been widely used to avoid blackouts caused by frequency or voltage collapse, the traditional low-frequency load shedding and low-voltage load shedding are independent of each other, and the frequency and voltage after large disturbances are not fully considered. The coupling effect and the frequency and voltage characteristics of the load, and the action thres...

Claims

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Application Information

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IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222H02J3/14
Inventor 张保会李晔关哲张鹭郝治国薄志谦
Owner XI AN JIAOTONG UNIV
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