Double-axis excitation device for synchronous condensers

Abstract

The invention discloses a double-axis excitation device for synchronous condensers. The double-axis excitation device comprises a reactive power calculation device, a comparison circuit, a low-excitation protection circuit, a control circuit and a q-axis excitation regulator; a voltage transformer and a current transformer are respectively connected with a voltage input end and a current input endof the reactive power calculation device; an output end of the reactive power calculation device is connected with a measurement input end of the comparison circuit; a given reactive power circuit isconnected with a power input end of the comparison circuit; an output end of the comparison circuit is connected with an input end of the low-excitation protection circuit; an output end of the low-excitation protection circuit is connected with a control input end of the control circuit; the voltage transformer is connected with a measurement input end of the control circuit; a given voltage circuit is connected with a voltage input end of the control circuit; an output end of the control circuit is connected with a differential voltage input end of the q-axis excitation regulator; the givenvoltage circuit is connected with a given input end of the q-axis excitation regulator; and an output end of the q-axis excitation regulator is connected with a q-axis excitation winding. The excitation device is capable of avoiding the problems of end heating and unit power angle increase caused by excessive phase-in of the condenser, thereby ensuring the static stability of unit operation.

Description

technical field [0001] The invention relates to a dual-axis excitation device for a synchronous condenser. Background technique [0002] When the synchronous condenser is running, there is no mechanical load on the rotor, and there is no active power conversion inside the motor, and it mainly exchanges reactive power with the outside world. As a reactive power compensation device, the synchronous condenser has outstanding advantages in terms of dynamic characteristics and capacity, and is widely used in UHV DC transmission projects and other fields. However, excessive phase advancement of the condenser will cause heating at the end of the motor, and excessive phase advancement for a long time will damage the insulation at the end due to heat. At the same time, if the phase advance is too deep, the power angle of the unit will increase, and in extreme cases, the unit will lose its static stability. Contents of the invention [0003] In order to overcome the deficiencies o...

AI Technical Summary

Problems solved by technology

However, excessive phase advancement of the condenser will cause heat at the end of the motor, and excessive phase advancement for a long time will damage the insulation at the end due to heat

At the same time, if the phase advance is too deep, the power angle of the unit will increase, and in extreme cases, the unit will lose its static stability.

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