Historical-information-based switching control method for neutral current suppression device of distribution transformer
A current suppression device and distribution transformer technology, applied in the field of data processing, can solve the problems of reducing the stability and safety of the power grid, repeated switching, error amplification, etc., and achieve the effect of increasing stability and safety
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Embodiment 1
[0033] Embodiment 1, a switching control method of a neutral line current suppression device of a distribution transformer based on historical information, comprising the following steps:
[0034] 1) Get parameters
[0035] The comprehensive quality analyzer with serial port communication function is adopted. The comprehensive quality analyzer adopts the customized product of Hebei Baoding Zhilian Electric Co., Ltd., and collects power parameters through voltage and current transformers: including distribution transformer three-phase voltage, three-phase current, neutral current, Frequency and angle of three-phase voltage and current (to calculate single-phase power factor). The collected data is transmitted to the control chip specially responsible for processing the data obtained by the mass analyzer through the serial port, or transmitted to the computer for analysis and calculation.
[0036] 2) Obtain active power and reactive power
[0037] Calculate apparent power:
...
Embodiment 2
[0052] In Embodiment 2, it is assumed that the adjustment capacity is composed of four adjustment capacitors a, b, c, and d whose capacities increase sequentially.
[0053] In practice, the capacitance adopts the method of graded switching, the capacitance adjustment is a fixed capacity, and the adjustment capacity is adjusted according to the historical information. It is assumed that the adjustment capacity is composed of four adjustment capacitors a, b, c, and d whose capacities increase sequentially. The invention adopts a setting method based on historical information to solve the fluctuation problem of theoretical calculation results. When the two theoretical capacity adjustment values fluctuate between two adjacent values, such as figure 2 As shown, the result of the latter time is introduced into the setting value of the previous time for comprehensive discrimination. The specific method is as follows:
[0054] 1. If the two calculated theoretical capacity adjus...
Embodiment 3
[0058] Embodiment 3, a specific example is given below.
[0059] Let the capacitance adjustment level in this example be a=1kvar, b=2kvar, c=3kvar, d=4kvar, and the fuzzy area is taken as =0.2kvar. Then (a+b) / 2=1.5 kvar
[0060] When the average value method is used for adjustment, if the input amount is calculated =1.2kvar<1.5kvar, then the setting result is 1kvar.
[0061] When historical information needs to be considered, if the last switching amount is 2kvar, and the calculation amount at this time is between (1kvar, 2kvar), then the setting method at this time is (a, (a+b) / 2- ] that is (1kvar, 1.3kvar], take 1kvar, in ((a+b) / 2- , b] that is (1.3kvar, 2kvar], take 2kvar, if the calculated adjustment capacitance is 1.6kvar at this time, then the setting result is 2kvar.
[0062] Divide the setting value by the minimum difference of a, b, c, d 1kvar, and convert the result into binary output to control the composite switch.
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