Static equivalence method for two-port external network based on measurement data of internal network

Abstract

The invention discloses a static equivalence method for a two-port external network based on measurement data of an internal network and belongs to the technical field of static equivalence of power systems. The method comprises the following steps of: firstly, inputting basic data of the internal network by using a computer through a program; secondly, according to the measurement data of the internal network, sequentially solving parameters of a simplified Ward equivalent circuit of the two-port external network and parameters of an expansion voltage source branch Ward equivalent circuit of the external network; and finally, acquiring equivalent parameters of the two-port external network. The method has the advantages that: by taking the physical characteristics of the equivalent parameters of the external network into consideration and adding a measurement equation of boundary node voltage and equivalent load current and the physical constraint of the equivalent parameters of the external network, the reasonability of the equivalent parameters of the external network can be effectively guaranteed, influence of measurement errors on the equivalent parameters can be effectively avoided, any external network information is not required, and the method is high in equivalence precision, good in equivalence effect and high in engineering practicability. The method can be widely applied to estimation of the static equivalent parameters of any two-port external network, in particular to static equivalence of the two-port external network with unknown model and state information in the power market environment.

Description

Technical field [0001] The invention belongs to the technical field of power system static equivalence, and specifically relates to a two-port external network static equivalence method based on internal network measurement data. Background technique [0002] The modern power system is a large-scale multi-regional interconnected system. When calculating and analyzing the regional power grid, it is generally necessary to equivalence the external power grid (external grid). The accuracy of the external network equivalent is directly related to the effectiveness of various calculation analysis and control decisions of the regional power grid, and is of great significance for ensuring the safe and stable operation of the regional power grid and the entire interconnected power system. [0003] The existing external network static equivalence methods are divided into two categories: the external network equivalence method based on the entire network data and the external network equivale...

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Problems solved by technology

The main disadvantages of this method are: the physical meaning of the equivalent parameters of the external network is not considered, and unreasonable phenomena such as negative resistance values ​​of the equivalent parameters of the external network cannot be avoided, and the equivalent results of the external network are greatly affected by the measurement error of the internal network. The numerical stability is poor, and the equivalent accuracy is not high, so the accuracy of the independent calculation and analysis of the regional power grid based on the equivalent value of the external network cannot be guaranteed, nor can the safe and stable operation of the regional power grid and the entire interconnection system be guaranteed

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