A method and system for judging effectiveness of reactive power regulation based on AVC

Abstract

The present invention proposes a method for judging the effectiveness of reactive power regulation based on AVC, including: S1. Real-time monitoring of the situation of the high reactive power of the main transformers in each substation, and recording the initial value; S2. Judging whether the high reactive power of the main transformers exceeds If so, generate a reactive power adjustment strategy command and execute it, otherwise, return to step S1; S3. Calculate the difference △Q of the reactive power of the main transformer before and after the reactive power adjustment; S4. Determine whether |△U| is greater than the reference value, if so, execute step S5, otherwise, AVC blocks the reactive power regulation of the main transformer becoming high; The regulation is effective; otherwise, the reactive power adjustment of the main transformer is blocked; the present invention also proposes an AVC-based reactive power adjustment validity judgment system to overcome the failure of the main transformer high reactive power data to be uploaded in time. The problem of high reactive power overshoot of the main transformer is ensured to ensure the stable operation of the power grid.

Description

technical field [0001] The present invention relates to the technical field of determining the effectiveness of reactive power regulation in substations, and more specifically, relates to an AVC-based method and system for determining the effectiveness of reactive power regulation. Background technique [0002] AVC (Automatic Voltage Control) refers to the automatic voltage and reactive power control of the power grid. At present, AVC has been widely used in power dispatching automation systems. The control and adjustment of substation voltage and reactive power can be realized through the lifting and switching of capacitors / reactors to ensure that the voltage and reactive power are running at a qualified level. [0003] The publication number is CN106353625A, and the Chinese patent with the publication date of January 25, 2017 proposes a method and system for detecting the effect of voltage and reactive power regulation in substations. The method calculates the average reac...

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Problems solved by technology

[0003] The publication number is CN106353625A, and the Chinese patent with the publication date of January 25, 2017 proposes a method and system for detecting the effect of voltage and reactive power regulation in substations. The method calculates the average reactive voltage sensitivity corresponding to AVC reactive power regulation multiple times. value, to realize the detection of the reactive power adjustment effect of the substation, which has high detection efficiency and detection effect, and is convenient for the staff to obtain the adjustment effect of AVC on the voltage reactive power adjustment of the substation in time; but this technical solution is to focus on AVC voltage reactive power The effect monitoring and analysis after adjustment does not consider the actual reactive power adjustment based on AVC. Because the channel transmission rate between the substation and the dispatching automation system is slow, the amount of data that needs to be uploaded by the substation in a certain period of time is large, or the collection in the station is abnormal, resulting in after adjustment. If the high reactive power data of the main transformer in the substation fails to be sent to the dispatching automation system in time, the AVC may generate the regulation strategy again because the data is still in the state of exceeding the limit, and issue the reactive power regulation strategy command to the substation , leading to the main transformer becoming high and over-adjusting the reactive power. On the one hand, it will cause a large amount of reactive power to flow between the transmission lines, increase the transmission line loss and reduce the transmission efficiency. On the other hand, it may cause the 110kV substation to 220kV substation. Send too much reactive power, reducing power supply reliability

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