A Method of Combined Load Shedding of Low Frequency and Low Voltage

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 system, etc., can solve the problem that it is difficult to effectively ensure the frequency stability and voltage stability of the power system, and cannot adapt to system operation Problems such as working conditions and disturbance forms, failure to fully consider frequency and voltage coupling effects, load frequency and voltage characteristics, etc.

Inactive Publication Date: 2016-08-24
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

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  • A Method of Combined Load Shedding of Low Frequency and Low Voltage

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Embodiment Construction

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

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

[0034] Under this disturbance, the calculation steps for the...

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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 local load shedding control using frequency and voltage information on the load side of a power system, and specifically relates to a low-frequency and low-voltage combined load shedding method. Background technique [0002] Frequency and voltage are important indicators for measuring system power quality. 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 large blackouts caused by frequency or voltage collapse, 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 ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
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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