Automatic switching control method for wide-area emergency power source of electric power system

Abstract

An automatic switching wide-area control method for a wide-area emergency power source of an electric power system is disclosed, which comprise the steps: 1) a primary station terminal acquires wide-area state information and switch information of the electric power system; 2) the primary station terminal represents an action list of a load feeder switch of a transforming plant; 3) the primary station sends the action list of the load feeder switch; 4) a plant station terminal receives the action list of the load feeder switch; 5) the plant station terminal detects an automatic switching device (2) for the emergency power source; 6) the plant station terminal switches off circuit switches by the side of the automatic switching device for the emergency power source at first and then cuts off, according to a control instruction, the load feeder required to be cut off, and sends information to the primary station terminal (1). The control method takes the safety of equipment by the side of the distant emergency power source into consideration while controlling the emergency power source to automatically switch, which can avoid the accident of the electric power system spreading, and local small power sources are difficult to apply an interference, thus causing no accident of erroneous motion and motion denial, in addition, since the cooperative operation with a safety control device can be realized, the utilization rate of the automatic switching device for the emergency power source and the reliability of the transforming plant in supplying power can be enhanced directly.

Description

technical field [0001] The invention relates to the technical field of automatic control of electric power systems, in particular to a control method for automatic switching of wide-area standby power sources in electric power systems. Background technique [0002] With the continuous expansion of the power system, it becomes more and more difficult to interrupt the short-circuit current of the regional power system, and in order to reduce the impact of the electromagnetic ring network on the safety of the power system, when the higher-level power system has formed a ring network, the regional power system The lower-level power system will break down the loop and provide power supply in radial partitions. However, the reliability of the power system after de-looping is significantly reduced. For this reason, the "automatic switching of backup power supply (in industry, it is often referred to as: automatic switching of backup power supply or BZT, hereinafter referred to as "...

AI Technical Summary

Problems solved by technology

[0050] 5. The backup power supply does not meet the pressure condition, and the automatic switching of the backup power supply should not act

[0051] 6. The automatic switching of the backup power supply should only be activated once, so the equipment needs to use the power supply to automatically switch once to lock the action or increase the charging conditions. Generally, it should be discharged immediately after the action so that the backup cannot be activated again.

[0056] (2) The existing backup power automatic switching strategy is susceptible to interference from local small power sources, resulting in misoperation and refusal accidents

[0057] At present, the fault power-off detection signal of the automatic switching of the backup power supply is generally voltage and current, and a single detection signal will lead to the occurrence of malfunction and refusal of the automatic switching of the backup power supply.

For some substations, the voltage setting value for power loss is set too low (such as the voltage is set at 30%). When the fault described in (1) occurs, after DL2 trips, the 110kV2M will not be affected by the support of the local unit. If the drop is too much, it will lead to the phenomenon of automatic switching and refusal of the backup power supply; Misoperation occurs when the reactive power load is heavy

[0058] (3) The existing backup power automatic switching strategy cannot realize coordinated action with the safety control device, resulting in the automatic switching of a large number of backup power sources having to be disabled

However, the concept of "wide-area control" and specific implementation methods have not yet been proposed in the literature, nor have any practical products appeared.

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