Method for estimating position of branching joint of transformer in transformer substation

Abstract

The invention provides a method for estimating a position of a branching joint of a transformer in a transformer substation. The method comprises the following steps of: 1, acquiring an equipment model in the transformer substation and measurement data, filtering the measurement data according to a mass identifier and a calculation demand of the measurement data, and selecting effective measurement data, wherein the acquired measurement data comprise a name plate parameter of the transformer and power, voltage and current measurement and pulse modulation unit (PMU) measurement of each set of equipment; 2, determining transformation ratios k12 and k13 of a high-voltage side winding to a medium-voltage side winding and a low-voltage side winding according to the PMU measurement or a power measurement value and a voltage measurement value, and pre-estimating the position of the branching joint of the transformer according to the transformation ratios k12 and k13; and 3, adding a virtual node between an ideal transformer and equalized impedance, performing optimization analysis according to a constriction relation between the measurements, and acquiring an estimation result of the position of the branching joint of the transformer. The position of the branching joint of the transformer is calculated and estimated by using various original parameters and data in the transformer substation, and the estimation result is accurate and real-time.

Description

technical field [0001] The invention relates to the field of power system calculation, in particular to a method for estimating the position of a transformer tap in a substation. Background technique [0002] With the development of the power grid and the improvement of the management level of the power grid, the scope of business involved in the operation and dispatch of the power system is continuously expanding, and the business volume is also increasing. The modern dispatching center is no longer a simple power grid operation monitoring center. It is not only responsible for safety and operation, but also responsible for transactions and operations. A modernized and automated command and decision-making center. On the other hand, with the improvement of intelligence and comprehensive level of the dispatch center, the dependence on the basic data has also reached an unprecedented level. In fact, with the online operation of various advanced applications, each dispatch c...

AI Technical Summary

Problems solved by technology

The right or wrong position of the transformer tap has a great impact on the state estimation results, and the impact on subsequent applications such as power flow analysis, voltage stability analysis, and AVC cannot be ignored. In severe cases, the calculation results will be unavailable or unreliable. This restricts the practical application of these applications, thereby reducing the ability of grid operators to judge and control the grid operating status

[0003] Due to the congenital deficiency of dispatch center information, the accuracy of the basic data of the dispatch center cannot be fundamentally solved through the improvement of the state estimation model and algorithm of the dispatch center

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