Transforming plant distributed state estimation method based on Kirchhoff's current law
A state estimation, substation technology, applied in the measurement of current/voltage, measurement of electrical variables, calculation, etc., can solve the problems of high maintenance error rate, heavy maintenance workload, topology error, etc., and achieve the effect of reliable and fast calculation
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[0023] The substation distributed state estimation method based on Kirchhoff's current law proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:
[0024] (1) Measurement collection: take T as the collection cycle, scan the voltage levels in the substation, and collect the current time t (0) The complex current measurement vector flowing on each switch in each voltage level in the time substation automation system Node injection complex current measurement vector Node complex voltage measurement vector z nd And the opening and closing state measurement of each switch;
[0025] (2) Estimation of zero-impedance current state: Assuming that all the switches in the above voltage levels are all closed, and the switches are regarded as zero-impedance branches, each voltage level in the substation constitutes a zero-impedance grid. impedance grid, the above and As a known quantity, by solving the following formula:
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