Load angle direct measurement method of hydroelectric synchronous machine

Abstract

The present invention discloses a method for directly measuring the power angle of a hydroelectric synchronous machine, wherein the method comprises the following steps: at the state that the generator is unloaded, obtaining a preliminary phase angle and a tooth pitch characteristic parameter of the fluted disc of the generator rotor by a PMU device through a sensor; when the generator is operated with load, matching the corresponding relationship between the preliminary phase angle sequence and the tooth pitch sequence through measuring the fluted disc characteristic and tooth pitch characteristic at this time; and calculating the real-time power angle through the matching relationship. The method according to the invention can measure the initiative error angle of the position signal ofthe generator and directly obtain an accurate power angle of generator at the state that the existing generator gear is not improved.

Description

technical field The invention relates to a method for directly measuring the power angle of a water wheel synchronous generator. Background technique The trend of the interconnection of major power grids in my country makes the monitoring of power grid security and stability particularly important. Since the generator power angle is an important state quantity that characterizes the safety and stability of the power grid, the Wide Area Measurement System (WAMS) and Synchronized Phasor Measurement Unit (PMU) constructed using synchronous clock technology have been widely promoted and applied in recent years. The more accurate method of measuring the power angle of the generator is: directly measure the position angle of the generator rotor in a certain space, so as to calculate the internal potential phase angle, and obtain it by the angle difference between the internal potential phase angle and the generator terminal voltage generator power angle. The method of directly ...

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Problems solved by technology

But in fact, due to the fact that a large number of gear plates of generator sets that have been put into operation have already been opened, and the importance of power generation equipment, it is very difficult to re-modify the gear plate of generators in practical engineering applications.

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