Closed-loop identification method for comprehensive load mechanism model of power distribution network

Abstract

According to the closed-loop identification method for the comprehensive load mechanism model of the power distribution network, the load mechanism model which is subjected to linearization processingand converted into a discrete transfer function form is embedded into the second stage of two-stage closed-loop identification, so that online identification of load mechanism model parameters is realized while closed-loop characteristics of a power system are considered. The method has the advantages that 1, based on the idea of open-loop conversion, the identification problem of the power system with closed-loop characteristics is converted into two open-loop identification processes, so that the influence of the closed-loop characteristics on the identification precision is reduced; 2, anoriginal system input-output transfer function is reserved in the identification process, so that an identification result of mechanism model parameters can be directly obtained.

Description

technical field [0001] The invention belongs to the field of power system load modeling, and in particular relates to a closed-loop identification method for a comprehensive load mechanism model of a distribution network. Background technique [0002] Establishing an accurate load model is an important prerequisite to ensure the effectiveness and credibility of power system simulation results. At the same time, the continuous development of distribution network demand-side response technology and the enhanced randomness of power grid operation mode have put forward higher requirements for the timeliness of load model parameters. [0003] In this context, the promotion and application of synchrophasor measurement unit (PMU) and power electronic equipment have created conditions for the online modeling of electric load based on the overall detection method. The PMU provides massive power system dynamic response real-time measurement data, which can be identified online and qu...

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Problems solved by technology

However, many typical closed-loop identification methods cannot be combined with load mechanism model identification. The main reasons are as follows: First, some identification methods require a known feedback model. For power system load model identification, the feedback channel is determined by the power flow equation and the adjacent area The load model is composed, and the prior knowledge of the model structure and parameters cannot be obtained

The second is that some identification methods cannot directly obtain the input-output transfer function of the system to be identified, but need to identify multiple transfer functions and perform calculations on the identification results. In this way, the order and structure of the model cannot be determined in the previous transfer function identification, let alone ensured. The value of each parameter in the result of the last multiple transfer function operations is within the range of physical meaning

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