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A Method of Adaptive Emergency Load Shedding Based on Power System Response Information

A power system, a technology for responding to information, applied in power network operating system integration, information technology support systems, AC network voltage adjustment, etc. According to other problems, it can achieve the effects of optimal steady-state recovery index, fast system transient recovery process, and guaranteeing voltage stability and frequency stability.

Inactive Publication Date: 2015-11-25
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 design process of low-frequency load shedding and low-voltage load shedding is independent of each other, and the frequency and voltage in large disturbances are not fully considered. Due to the mutual coupling characteristics of the latter, the low-frequency load shedding does not consider the influence of voltage space-time distribution, and the low-voltage load shedding is only controlled according to the voltage drop amplitude, lacking the corresponding theoretical basis, which has great influence on the stability of the power system and the economy of the control effect. Negative Effects

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  • A Method of Adaptive Emergency Load Shedding Based on Power System Response Information
  • A Method of Adaptive Emergency Load Shedding Based on Power System Response Information
  • A Method of Adaptive Emergency Load Shedding Based on Power System Response Information

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] 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.

[0028] 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 self-adaption urgent load shedding method based on electric system response information includes the step 1 of calculating transient voltage stabilization indexes of load nodes, namely, Y indexes, the step 2 of figuring out the proportion of the Y indexes of the load nodes accounting for the sum of the Y indexes of all load nodes, and the step 3 of working out the load shedding quantity of each load node. The method can provide a guarantee for frequency stability and voltage stability of an electric system under major failures.

Description

technical field [0001] The invention belongs to the technical field of emergency load shedding by using power system response information, and in particular relates to an adaptive emergency load shedding method based on power system response information. 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 design process of low-frequency load shedding and low-voltage load shedding is independent of each other, and the frequency and voltage in large disturbances are not fully considered. Due to the mutual coupling characteristics of the latter, the low-frequency load shedding does not consider the influence of voltage space-time distri...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 张保会李晔郝治国杨浩关哲余晓鹏张振安雷俊哲刘巍
Owner XI AN JIAOTONG UNIV
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