EMD (Empirical Mode Decomposition)-based transient process pressure pulsation numerical value processing system and method thereof
A pressure pulsation, transient process technology, applied in special data processing applications, design optimization/simulation, etc., can solve problems such as pressure pulsation instability and increased unit instability
Pending Publication Date: 2022-03-11
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +2
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Problems solved by technology
[0002] During the transient process of the unit, the instability of the unit increases, and there will be safety problems if the pressure pulsation is too high. When the unit is put into operation for the first time, there will also be problems such as the instability of pressure pulsation
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[0019] The specific technical solutions of the present invention are described in conjunction with the examples.
[0020] as per figure 1 Steps shown:
[0021] Test environment: When the two machines are operating normally with a load of 225MW, 75% of the rated load is dumped at the same time, the upstream water level is 397.28, the downstream water level is 76.88, the guide vanes are normally closed, and the ball valve is closed. Arrange the pressure sensor, collect the pressure pulsation value, and use the empirical mode analysis (EMD) to decompose the test data through 9 times of EMD to obtain the frequency range and maximum amplitude of each order IMF. The sum of the IMF components of each order is taken as the pressure pulsation, and the final margin is taken as the mean pressure. According to the EMD decomposition, it can be seen that for the ball valve and volute inlet measuring points, the maximum energy of No. The lower segment is between 20 and 80Hz. Using the on...
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The invention provides an EMD (empirical mode decomposition)-based transient process pressure pulsation numerical value processing system and method, and a regression analysis module. A pressure pulsation signal value in a unit transient debugging test is acquired, IMF (intrinsic mode function) components are extracted, the sum of the IMF components is used as pulsation pressure, and the final margin is used as mean pressure; carrying out constant flow calculation analysis and non-constant flow calculation analysis to obtain a mathematical model closest to the debugging test; the average pressure, the unit rotating speed, the surge chamber water level fluctuation process and the extreme value are obtained and calculated; and the speculation comparison calculation analysis module is used for carrying out one-dimensional transient process calculation to obtain a calculated mean pressure and a calculated rotating speed value, so that parameters under the most unfavorable transient working condition can be obtained, and if extreme values of the parameters cannot completely meet the design requirements, optimization is carried out, and the next round of speculation comparison calculation is carried out until all the parameters meet the design requirements. The complete pressure pulsation regression analysis and speculation comparison calculation method suitable for the unit transient test is formed.
Description
technical field [0001] The invention relates to the field of pressure pulsation analysis of hydroelectric power station units, in particular to a transient process pressure pulsation numerical processing system and method based on Empirical Mode Analysis (EMD). Background technique [0002] During the transient process of the unit, the instability of the unit increases, and there will be safety problems if the pressure pulsation is too high. When the unit is put into operation for the first time, problems such as the instability of pressure pulsation will also occur. Therefore, it is necessary to conduct unit debugging tests to predict the pressure pulsation value, judge whether it is within a safe range, and reduce potential safety hazards. The invention reduces the error of analyzing the value of the pressure pulsation, and analyzes the operating environment of the unit within the safe range. Contents of the invention [0003] The present invention provides a transient ...
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Login to View More IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 任绍成郑建兴曾艳梅陈柳李海玲刘扬
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES