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Control method and device suitable for FCB triggering under isolated network operation

A control method and technology of a control device, which are applied in circuit devices, single-grid parallel feeding arrangements, AC network circuits, etc., can solve problems such as the operation that cannot meet the load of part of the power grid, and the inability to effectively distinguish between internal faults and external faults.

Active Publication Date: 2021-02-09
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0005] This patent provides a control method and device adapted to FCB triggering under isolated grid operation, which is used to solve the problem that the existing technology cannot meet the needs of multiple units to form an isolated grid belt The operation of the grid load, and the technical problem that it is impossible to effectively distinguish between internal faults and external faults

Method used

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  • Control method and device suitable for FCB triggering under isolated network operation
  • Control method and device suitable for FCB triggering under isolated network operation
  • Control method and device suitable for FCB triggering under isolated network operation

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Embodiment 1

[0046] For ease of understanding, see figure 1 , Embodiment 1 of a control method adapted to FCB triggering under isolated network operation provided by this patent, including:

[0047] Step 101 , when the connection between the power grid in the target area and the main grid is in an open state, and the frequency of the power grid in the target area is in an abnormal state, generate an FCB trigger signal through the stabilizing device in the power grid.

[0048] It should be noted that if the connection between the power grid in the target area and the main grid is in the disconnected state, the system is in a disconnected state, and the frequency is in an abnormal state, which means that the frequency is outside a preset frequency range and within the preset frequency range. to normal state. When the above two states are satisfied at the same time, the safety device will be triggered to generate the FCB trigger signal. The safety and stability device is also called the saf...

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Abstract

The invention discloses a control method and device suitable for FCB triggering under isolated network operation, and the method comprises the steps: generating an FCB triggering signal through a safety device in a power grid under the conditions that the connection between a target district power grid and a main network is in a switching-off state and the frequency of the target district power grid is in an abnormal state; prompting an excitation system of the power plant unit to switch an excitation control mode into a constant voltage control mode according to the FCB trigger signal, and adjusting an excitation difference adjustment coefficient to zero; prompting a speed regulation system of the power plant unit to switch a speed regulation switching control mode into a rotating speed differential closed-loop control mode according to the FCB trigger signal, and configuring a given value for the rotating speed differential closed-loop control mode according to the current unit load.The technical problems that in the prior art, the requirement for partial power grid load operation of an isolated network belt built by multiple units cannot be met, and internal faults and externalfaults cannot be effectively distinguished can be solved.

Description

technical field [0001] This patent relates to the technical field of power grid unit control, in particular to a control method and device adapted to FCB triggering under isolated grid operation. Background technique [0002] Fast load shedding (FCB: Fast Cut Back) means that when the unit is running above a certain load, due to the failure of the external power grid and disconnected from the power grid, all external power supply loads are instantly shed, and the boiler is kept running at the lowest load to maintain The generator is equipped with the automatic control function of factory power operation. [0003] Under natural disaster conditions such as typhoons, the power grid will be forced to split into several isolated grids for operation, and the power plant will face the threat of a power outage for the entire plant. If the control is not good, it may cause serious equipment damage. When the thermal power plant is completely powered off, the status and parameters of ...

Claims

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Application Information

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IPC IPC(8): H02J3/14H02J3/38
CPCH02J3/14H02J3/388Y04S20/222Y02B70/3225
Inventor 张俊峰吴晓宇张毅超杨跃
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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