Error-adaptive power distribution network synchronous phasor measurement data real-time compression method

Abstract

The invention discloses an error-adaptive power distribution network synchronous phasor measurement data real-time compression method. The method comprises the following steps: setting measurement data real-time compression parameters; obtaining a measurement data point at the current moment and a corresponding time scale, and initializing a data sending point and the corresponding time scale; obtaining a measurement data point at the current moment and a corresponding time scale, and initializing a temporary data point stack and a corresponding time scale stack; obtaining a measurement data point at the current moment and a corresponding time scale, and initializing a previous data point of the current measurement data point and the corresponding time scale; acquiring a measurement data point at the current moment and a corresponding time scale, and executing trend compression of the filtering revolving door; executing a linear interpolation reconstruction process on the compressed data, and calculating a compression ratio and a reconstruction error; error demand judgment is executed; calculating an error ratio and a dynamic amplitude modulation function, calculating a filtering limit value and a compression limit value, and constraining upper and lower limits of the filtering limit value and the compression limit value. According to the method, good compression performance isobtained while the data accuracy is ensured.

Description

technical field [0001] The invention relates to a method for compressing synchronized phasor measurement data used in power systems. In particular, it relates to an error-adaptive method for real-time compression of distribution network synchronized phasor measurement data. Background technique [0002] With the continuous development and improvement of phasor measurement technology, filtering technology and global positioning system, the synchronized phasor measurement unit (Phasor Measurement Unit, PMU) in the power system wide-area measurement system has been obtained in key nodes of the transmission network. It plays an important role in the operation monitoring, protection and control of the power system. [0003] In recent years, with the continuous access of distributed power and renewable energy, the dynamic response and unsightly problems of the distribution network have become increasingly prominent. In order to improve the safe operation level of distribution ne...

AI Technical Summary

Problems solved by technology

However, the high sampling frequency of the PMU will generate massive measurement data. If these massive data are uploaded from the communication network to the power grid control center in real time, the communication network will inevitably bear heavy burdens of information transmission and processing. Excessive delay may threaten the safe and stable operation of the power grid. Therefore, effective compression processing of PMU measurement data has important scientific and engineering value

[0004] Existing data compression methods, such as data compression technology based on wavelet analysis and non-equal interval data compression technology, are designed for storing historical data, and are not suitable for compressing real-time measurement data

Images