Method for checking out phase handling unit (PHU) in site

Abstract

The method is in use for checkout on site by using synchronous phase measuring unit (PMU). Arrangement and steps of the method are as following: one PMU tester and one PC with communication software for simulating main station are utilized; PMU device to be measured and PMU tester are connected to same AC signal source; PMU device and PMU tester receive own GPS satellite clock synchronization signal respectively; through data LAN, PC receives data of real phase of PMU device and PMU tester; time synchronism sorting is carried out according to GPS timing mark carried by own data message for data of real phase from PMU device and PMU tester; then, error comparison and root-mean-square error calculation are carried out for two sets of data at same time within a period of time; finally, root-mean-square error and confidence interval of error are obtained.

Description

technical field [0001] The invention discloses a method for on-site calibration of a phasor measuring device (PMU). The method adopts error analysis of synchronous comparison between the measured data of the measured PMU and the standard measured data of the PMU tester. The invention is mainly applied to the engineering construction of a wide area measurement system (WAMS), and belongs to the field of power systems and automation thereof. Background technique [0002] In order to ensure the safe and stable operation of regional power grids, major power grids at home and abroad have accelerated the application of wide area measurement systems (WAMS) and phasor measurement units (PMU), and installed PMU devices in some hub substations and large power plants for synchrophasor measurement. The dynamic phasor information is transmitted to the WAMS main station system, and the WAMS main station implements dynamic and stable monitoring of the power grid according to the measurement...

AI Technical Summary

Problems solved by technology

The phasor data of the power grid changes rapidly with time. Traditional calibration devices or AC sampling transmitters cannot provide dynamic phasor data, but can only provide steady-state amplitude data of the power grid.

For a long time, a large number of PMU field performance tests only test its amplitude accuracy, and other indicators can only be carried out under relatively good laboratory conditions, especially for the key satellite time synchronization accuracy, internal potential power angle of the unit and line phasor, Communication protocols and transmission performance lack direct testing methods. Generally, after the system is connected to the network, the correctness of the phase angle measurement is roughly checked by the master station, so it can only be qualitatively determined, and quantitative error analysis cannot be performed. A large amount of power grid dynamic data collected by a large PMU makes it difficult to determine the measurement accuracy and identify out-of-tolerance data according to technical standards, which seriously affects technical evaluation, completion acceptance and operation and maintenance

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