The basic working circuit is an essential unit circuit for the controllable excitation device to supply the excitation current to the generator and complete the task of automatic regulation. It includes the following working circuits: power conversion and reactive power regulation: transforming the output voltage of the generator into the voltage signal required for automatic detection, and combining the change of reactive current. The output can reflect the change of voltage difference and reactive power Signal source of current variation. Automatic detection and comparison: detect the output signal of the power transformation and reactive power differential regulation circuit, compare the deviation of the generator terminal voltage and the change of the power factor with the given value, output a DC voltage deviation signal, and control the conduction angle of the thyristor after amplification. Comprehensive amplification of voltage deviation and reactive current variable: since the output signal of the automatic detection and comparison circuit is relatively weak, in order to meet the static and dynamic automatic regulation accuracy of the excitation system, it must be amplified. In addition, in addition to the deviation signal detected automatically, there are other auxiliary control signals (such as over excitation limit, under excitation limit, etc.), which act on the phase shift trigger circuit together. Phase shift trigger circuit: convert the integrated and amplified control signal into phase shift trigger pulse corresponding to each phase of thyristor. Excitation power output circuit: it is generally composed of excitation power supply and controllable converter, which is controlled by phase-shifting trigger pulse. The output voltage of the power output unit can be changed by changing the phase of the phase-shift trigger pulse, so as to realize the purpose of adjusting the excitation.<br>
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