Generator bar vibration optimization method based on modified long-short term memory neural network

Abstract

The invention relates to a generator bar vibration optimization method based on a modified long-short term memory neural network. The method comprises the following steps: acquiring and processing historical data; and taking the feature vector and the label vector as input of a generator bar vibration LMLSTM model, and training the generator bar vibration LMLSTM model by using data in the training set and the verification set. The method has the beneficial effects that: the influence of each parameter of the generator on the vibration of the coil bar is excavated from a method of combining a mechanism and a mathematical theory; a generator bar vibration model based on the corrected long-short term memory neural network is established, the influences of the average temperature of the generator bar and the average temperature of the generator iron core on the vibration of the generator bar are analyzed, and a three-dimensional relation control chart is made; and the overall and local adjustment directions of the stator cooling water inlet temperature of the generator and the cold hydrogen temperature of the generator are clearly pointed out, so that the excessive vibration of the end part of the generator bar in the operation process is suppressed by adjusting the related temperature, and the requirement of safe and stable operation is met.

Description

technical field [0001] The invention belongs to the technical field of generator wire rod vibration optimization, and in particular relates to a generator wire rod vibration optimization method based on a corrected long-short-term memory neural network. Background technique [0002] When the generator is running normally, the stator bar of the generator is subjected to the alternating electromagnetic force of single and double frequency. With the continuous expansion of the unit capacity of the generator, the electromagnetic force also increases. Due to the low stiffness of the end of the generator bar suspended outside the stator core, the problem of excessive vibration at the end of the generator bar caused by the influence of electromagnetic force is becoming more and more prominent. [0003] When the natural vibration frequency of the end of the generator is close to 100HZ, it is easy to resonate with the electromagnetic force of twice the power frequency, causing the v...

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Problems solved by technology

[0005] At present, the treatment methods for excessive vibration at the end of the generator mainly include: overhaul dismantling inspection method, that is, dismantling during overhaul to check the fixing condition of the wire rods, whether there is wear or not, rebinding, reinforcing, and adjusting the structure of the wire rods to make the stator The natural frequency at the end avoids the single and double frequency areas, which has a certain effect, but this method takes a long time, consumes a lot of money, and needs to be shut down, which affects the power generation plan of the unit

The method of adjusting the vibration of the wire rod by trying to increase or decrease the cooling water temperature and the hydrogen temperature according to the feedback has a certain effect, but this method lacks the mathematical support of the historical data level, and cannot clearly give the direction of temperature adjustment. The feedback adjustment mechanism is only suitable for monotone functions, and it is easy to be limited to the local optimal solution for complex generator bar vibration and cannot achieve a good suppression effect

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