Method for accurately measuring wide-area power grid PMU (Phasor Measurement Unit) data time delay

Abstract

The invention discloses a method for accurately measuring wide-area power grid PMU (Phasor Measurement Unit) data time delay, and relates to the field of real-time dynamic monitoring of electric power systems. At present, the wide-area power grid PMU data time delay cannot be accurately measured. The method includes the following steps of: arranging a simulated front-end system at a WAMS master station terminal; transmitting-receiving mirror images by a port on the PMU data communication side of an interchanger between the PMU and the simulated front-end system or between the PMU and the WAMS interchanger to an idle port; access the mirror image port into a collection internet access of a network recorder which records moment of data passing through the interchanger; analyzing to obtain the time information of a required data interaction process according to the original communication data collected by the network recorder; calculating the wide-area power grid PMU data time delay according to the time information of the data interaction process. The technical scheme does not influence the existing data interaction of WAMS and PMU, and can obtain the accurate PMU data time delay.

Description

technical field [0001] The invention relates to the field of real-time dynamic monitoring of power systems, in particular to the PMU-based wide-area measurement system and the PMU-based wide-area power grid real-time closed-loop control system. Background technique [0002] At present, the phasor measurement unit (PMU), which uses a synchronous clock (such as the timing signal of GPS) as the reference clock source for data sampling, has been widely used in my country's power system. As an important component of the real-time dynamic monitoring system, Using the power dispatching data network as the communication channel, the measurement information and control information are transmitted through the network in accordance with the specifications, providing real-time measurement data for the wide-area measurement system (WAMS), receiving and responding to commands issued by the master station. As one of the main factors affecting the performance of the real-time closed-loop con...

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Problems solved by technology

[0004] (1) Delay measurement needs to be performed inside WAMS. On the one hand, it may affect the performance of WAMS. On the other hand, it is impossible to measure the time between PMU and WAMS from the moment when the first PMU collects data to the last WAMS receives PMU control response information. closed-loop delay

[0005] (2) The internal time scale of the PMU measurement information is the moment when the PMU collects data, and the time accuracy is at the microsecond level, but the WAMS system time is synchronized through the network (SNTP), and the accuracy is at the millisecond level, so this method cannot accurately measure milliseconds or Ten millisecond PMU measurement information delay

[0006] (3) The internal time scale accuracy of PMU control information is at the second level, so this method cannot accurately measure the delay of PMU control information at the millisecond level

[0007] (4) The data communication between PMU and WAMS can be based on TCP or UDP protocol. Some WAMS do not support the communication process based on UDP protocol, and the communication delay between PMU and WAMS based on UDP protocol cannot be measured.

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