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Method for self-adaptively and emergently shedding induction motor loads based on slip responses

A technology of induction motor and slip rate, which is applied in the direction of motor control, electrical components, AC network voltage adjustment, etc., can solve the adverse effects of power system stability and economy, does not consider the time and space distribution of voltage, and does not fully consider the interaction between frequency and voltage Coupling characteristics and other issues to achieve optimal steady-state recovery indicators, fast system transient recovery process, and the effect of ensuring voltage stability and frequency stability

Inactive Publication Date: 2014-06-25
XI AN JIAOTONG UNIV
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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, there are still two problems in the design process of low frequency load shedding and low voltage load shedding: one is the low frequency load shedding Load shedding and low-voltage load shedding are independent of each other, and the mutual coupling characteristics of frequency and voltage after large disturbances are not fully considered. Low-frequency load shedding does not consider the influence of voltage space-time distribution. In the process, loads are often shed in the same proportion in designated areas, which has an adverse effect on the stability of the power system and the economy of the control effect; second, the current low-frequency load shedding and low-voltage load shedding have not fully taken into account The dynamic process of the induction motor, which accounts for the largest proportion of the load, and the dynamic characteristics of the induction motor have a significant impact on the transient stability of the system voltage

Method used

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  • Method for self-adaptively and emergently shedding induction motor loads based on slip responses
  • Method for self-adaptively and emergently shedding induction motor loads based on slip responses
  • Method for self-adaptively and emergently shedding induction motor loads based on slip responses

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Embodiment Construction

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

[0033] Such as figure 1 As shown, the IEEE39 node system, considering the generator voltage regulator and governor, the load adopts a 70% induction motor and 30% constant impedance parallel model, the motor considers the electromagnetic transient process of the rotor, and the simulation is carried out on PSASP with a step size of 0.01 seconds , with a duration of 10 seconds.

[0034] The failure mode is 0.5 seconds, unit 31 tripped, and the two adjacent lines 6-11 and 4-14 were disconnected at the same time. The original active output of the system was 6141.208MW, and the active power of the load was 6097.5MW. After the failure, the system lost active power 520MW. After the failure, the system will experience power angle instability, frequency instability and voltage instability, and the system will oscillate violently, and the indu...

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Abstract

A method for self-adaptively and emergently shedding induction motor loads based on slip responses comprises the following steps of (1) calculating voltage-slip response factors of all load nodes, (2) ranking all the load nodes according to the voltage-slip response factors, (3) selecting load shedding sites, (4) calculating the proportion of the voltage-slip response factors of all the load shedding sites in the total sum of the factors of all the load shedding sites, (5) calculating the loading shedding amounts of all the load shedding sites, and (6) checking whether the loading shedding amounts of all the loading shedding sites exceed the original total load amounts of all nodes or not. According to the method for self-adaptively and emergently shedding the induction motor loads based on the slip responses, the frequency stability and the voltage stability of a power system under serious failure disturbance can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of emergency load shedding by using the response information of the whole network, and in particular relates to a method for adaptive emergency load shedding of an induction motor based on a slip response. 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, there are still two problems in the design process of low frequency load shedding and low voltage load shedding: one is the low frequency load shedding Load shedding and low-voltage load shedding are independent of each other, and the mutual coupling characteristics of frequency and voltage after large disturbances ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/14H02P29/00
CPCY02B70/3225Y04S20/222
Inventor 张保会郝治国李晔杨浩郑涛
Owner XI AN JIAOTONG UNIV
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