Voltage alarm method used for buses of main electric network

Abstract

The invention provides a voltage alarm method used for buses of a main electric network. The voltage alarm method includes the following steps: (1) judging the incidence relation between the buses and the voltage stage, and taking the bus, with the minimum difference value between the voltage value and the rated value, in the multiple buses belonging to the same voltage stage for conducting out-of-limit judgment; (2) conducting filtering processing on the voltage value of a pilot node to obtain a relatively-smooth voltage curve, analyzing the voltage variation trend according to the curve, calculating the time for reaching an out-of-limit value according to the voltage variation trend, and giving out an alarm if the time is smaller than a setting value; (3) reading historical data of the bus operation voltage in the previous day, evaluating voltage out-of-limit risks this day, giving out an alarm if the risks are found, classifying the alarms, and notifying a dispatching and operating person to make a processing scheme in advance. According to the voltage alarm method, analysis objects are improved into the voltage stage, misinformation caused by bus overhauling is avoided, and the bus voltage real-time out-of-limit monitoring function of a conventional processing method is retained.

Description

technical field [0001] The invention relates to a bus voltage alarm method, in particular to a voltage alarm method for a provincial power grid dispatching agency to monitor a main grid bus, and belongs to the technical field of power quality monitoring. Background technique [0002] With the rapid development of our country's national economy, the power industry has entered a period of development of large power grids, large units, and high voltage. The national economy puts forward higher requirements for the safety, reliability and economy of the power grid operation, and at the same time, the requirements for the power quality of the power grid are also getting higher and higher. Too high, too low, and too large fluctuations in the grid voltage will have a serious impact on user load equipment, the operation of the grid's own equipment, and the network loss of the grid. The quality of voltage also comprehensively reflects the overall level of power grid planning, operat...

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Problems solved by technology

The current monitoring method mainly adopts the method of real-time monitoring, periodically judges the bus voltage value of the central point according to the limit value set in advance, and sends an alarm if it exceeds the limit value. This method has the following problems: 1. It is difficult to select the alarm limit value. If the setting is looser, the voltage has already reached the edge of the limit when the alarm is issued, and there is not enough time for voltage adjustment; if the setting is stricter, it will give frequent alarms whe

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