Multi-dimensional power flow evaluation index method based on statistic analysis of historical information of power grid

Abstract

The invention relates to a multi-dimensional power flow evaluation index method based on the statistic analysis of the historical information of a power grid. The method comprises the following steps of: preprocessing power flow information: acquiring the power flow information in a selected time interval from a database, calculating a power flow overload coefficient alpha representing the power flow overload degree of single equipment or a power transmission cross section, and comparing the acquired historical power flow data with the limit value of the equipment or the cross section; carrying out statistic calculation on power flow time features: counting time corresponding to different power flow overload degrees through the utilization of the power flow overload coefficients and the corresponding time periods, and summing the time periods to obtain the relationship between the power flow overload degrees and the running time; and carrying out statistic calculation on the multi-dimensional power flow evaluation indexes (PFI). According to the multi-dimensional power flow evaluation index method, a power flow distribution curve is drawn on the basis of the historical data of the power grid according to the power flow evaluation indexes (PFI), an auxiliary means is provided for the power flow analysis and the power flow prediction of the power transmission cross section of the power grid and the medium and long term statistic analysis of the power grid, and the key power flow control indexes of the power grid are converted to the multi-dimensional statistic indexes.

Description

technical field [0001] The invention relates to a statistical and multi-dimensional grid power flow evaluation method. Based on the grid historical data, by counting the power flow information of a single device or an important power transmission section, the evaluation index representing the qualified rate of the power flow is calculated. The multi-dimensional power flow evaluation index method analyzed reflects the health degree and change trend of the current power grid operation, and provides reliable auxiliary decision-making for the adjustment of power grid operation mode and risk preventive control. Background technique [0002] Power grid power flow is one of the most direct reflections of the operating state of the power system. When the power grid is in normal operation, its power flow is within a reasonable range; when some equipment in the power grid is abnormal or faulty and forced to withdraw from operation, resulting in a decrease in the stability limit of rel...

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Problems solved by technology

[0004] During the long-term operation of the power grid, a large amount of historical data has been accumulated. These data describe the long-term operation status and change trend of the power system, and contain the trend characteristics of the power grid operation. The development of

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