Method for measuring generator internal electric potential phase position by adopting rotating speed pulses of hydroelectric generating set

Abstract

The invention discloses a method for measuring generator internal electric potential phase position by adopting rotating speed pulses of a hydroelectric generating set. The method includes that when the number of pole pairs of the hydroelectric generating set is equal to the number of teeth of a toothed plate, the rotating speed pulses generated from the toothed plate are virtual key pulses; when the number of the pole pairs of the hydroelectric generating set is not equal to the number of the teeth of the toothed plate, the toothed plate with the number of the teeth being equal to the number of the pole pairs is 'virtually' mounted on a shaft of the hydroelectric generating set, and the pulses generated from the virtual toothed plate are called the 'virtual key pulses'; and when the acquired virtual key pulses are equivalent to the key pulses of a steam turbine generating set, the generator electric potential phase position can be measured by a key pulse method. By the method, high-precision internal electric potential phase position can be realized by the aid of the rotating speed pulses of the hydroelectric generating set.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof, and in particular relates to a method for measuring the potential phase in a generator by using the rotational speed pulse of a hydroelectric unit, which can be referred to as a "virtual bond phase pulse method". Background technique [0002] The internal potential phase angle of the generator is an important parameter to evaluate the stability of the power system. In order to strengthen the dynamic stability monitoring and analysis capabilities of the power system, it is necessary to install a synchronized phasor measurement device (PMU) in an important power plant, and the PMU device is required to use key phase pulses. The method measures the internal potential phase of the unit, so as to ensure that the PMU can also provide high-precision internal potential phase information during the grid disturbance process. [0003] For steam turbine units (thermal po...

AI Technical Summary

Problems solved by technology

But usually the number of pole pairs of the unit is not equal to the number of teeth on the gear plate. At this time, the speed pulse cannot be directly used for internal potential phase measurement

[0004] For the speed pulse, the currently available method is only the speed integral method, but its practical application effect is not ideal

In the steady state, the theoretical angle error is more than 2 to 3 degrees, and there is a delay error; in the transient state, its accuracy cannot be guaranteed

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