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Load quick-cut control system

A technology for controlling systems and loads, applied in information technology support systems, power network operating system integration, climate sustainability, etc.

Active Publication Date: 2013-06-19
深圳市康必达中创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For small network conditions, once a generator fails and trips, the output power of the generator decreases instantaneously, the voltage drops, and the frequency drops sharply, which will easily cause other generators in normal operation to fly, and the relay protection will operate, and in severe cases, the entire system will be damaged. The power system collapsed and paralyzed, causing huge losses to the enterprise

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] figure 1 , figure 2 , image 3 As shown, considering that the fault tripping is the direct starting condition for the fast switching of the entire load, so to judge the generator fault tripping, in addition to judging the position of the switch, the minimum load judgment is also added, and then considering the communication interruption of the unit processor or the processor In the case of a fault, the power cannot be collected, and the trip of the fault cannot be judged, so a processor communication interruption judgment logic is added. The power and position of the generator are collected by the local processor. The switch position collects a normally open contact and a normally closed contact at the same time, so as to avoid the possibility of misjudgment of fault tripping by only collecting one switch position. The purpose of judging the falling edge of the switch is to make the After a fault trip occurs, the load fast-cutting start is not maintained all the time...

Embodiment 2

[0026] Figure 4 As shown, the principle of load shedding judgment is based on the fault tripping, the current generator operating load P1+P2+P3 before the tripping (P1, P2, P3 are the power of No. 1, No. 2, No. 3 generators respectively), minus other The maximum total output TP of the operating unit is the load to be removed. Considering that the actual normal operation of the generator has large load fluctuations, especially the load fluctuations in the few seconds before the generator failure trip, P1\P2\P3 are taken from the 20 seconds to the first 10 seconds before the generator failure trip The average power ensures the rationality and reliability of data sampling.

Embodiment 3

[0028] Figure 5 As shown, the first round of low-cycle time mainly considers the time for the generator to automatically adjust after the fault trips, and it is recommended to be 3 seconds. Considering the possible risks after the first round of low cycle, it needs to be removed quickly, so it is recommended to set the time of the following low cycles to 0.3 seconds. The total load refers to the sum of the given load that can be shed, including the removed load.

[0029] Figure 6 As shown, this low cycle is used as a backup plan to consider the sudden insufficient output of power generation and the start of a large motor. The first round of low cycle time mainly considers the start of a large motor or the fluctuation of system frequency. After the round of low cycle, the possible risks need to be removed quickly, so it is recommended to set the time of the following low cycle to 0.3 seconds. The total load refers to the sum of the given load that can be cut, including the ...

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Abstract

The invention discloses a load quick-cut control system which is based on a low-capacity power grid separated from a high-capacity power grid. If emergencies such as generator failure disconnection in an isolated power grid operation working condition happen, in order to achieve safe operation of a small power grid system, partial load in the small power grid needs to be cut off quickly, sampling data needs to be accurate, quick-cut speed is quick, failure machine stopping and load cutting are judged, underfrequency load shedding is carried out, after a generator is stopped caused by failure, in order to prevent the failure from further expanding, partial load is quickly cut off in 300 ms, and accordingly electricity generating and using of the power grid reach reasonable balance in a short time, electricity using load is adjusted and switched, basic operation of a factory under an abnormal condition is guaranteed, and requirements on isolated power grid operation are met.

Description

technical field [0001] The invention relates to the field of electric power control such as power generation, power transmission, power transformation, power distribution and power consumption, and specifically relates to a fast load switching control system adopted when a generator suddenly fails or trips or other abnormal conditions occur during the operation of a small power grid. . Background technique [0002] Isolated grid is the abbreviation of isolated power grid. It generally refers to a small-capacity grid that is separated from the large grid. According to the power construction regulations, a grid with a maximum stand-alone capacity less than 8% of the total capacity of the grid can be called a large grid. At present, the power grids in major regions of my country The capacity ratio of machine-to-grid is less than 8%, which can be regarded as an infinite power grid. In contrast, grids with a capacity ratio of more than 8% are collectively referred to as small grid...

Claims

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Application Information

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IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 林峰平丁建义鄢军华李晏
Owner 深圳市康必达中创科技有限公司
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