SU119590A1 - Method for automatic regulation of synchronous machine excitation - Google Patents

Description

Regulating the excitation of high-power synchronous generators operating on long-distance power lines is one of the measures that contribute to improving the stability of transmission lines. Particularly favorable results are provided by the use of an asynchronized synchronous machine, the excitation of which is regulated along two mutually perpendicular axes, namely, by changing the voltage in the longitudinal field winding depending on the sine of the angle in between the axis of the rotor poles and the network voltage vector (or and the derivatives of this function, and the voltage in the transverse winding depending on the cosine of the specified angle and derivatives.

To further increase the stability of such an asynchronized synchronous machine, which is becoming increasingly important due to the increase in power and length of power lines, it is proposed to change the voltage in the machine windings of the machine additionally by multiplying these functions by a linear function of changing the rotor speed and its derivatives .

The drawing shows a block diagram of an apparatus for carrying out the proposed method.

Signals proportional to the sine and cosine of the angle in (Sin in and Cos in) between the axis of the rotor poles and the network voltage vector (or women) and the derivative of these functions, obtained at the output, respectively, of the regulators 1 U1 2, are fed through a phase shifter 3 or 4 serving to correct the voltage at the terminals of the machine, respectively on blocks 5 and b. At the same time, a voltage is applied to the input of these blocks from the controller 7, which is proportional to the linear function of the rotational speed (A) of the rotor and its derivative.

At the output of blocks 5 and 6, voltages are obtained proportional to the products of the input signals. These voltages are used to vary the voltages in the longitudinal and transverse field windings of the machine, respectively, with the help of power units 8 and 5.

The proposed method can also be used to automatically control the excitation of a machine with several field windings forming a multiphase system of windings, the currents of which vary depending on the angular functions of the angle c.

Subject invention

1. A method for automatically controlling excitation of an asynchronized synchronous machine by changing the voltage in the longitudinal field winding depending on the sine of the angle in between the axis of the rotor poles and the network voltage vector (or network) and on the derivatives of this function, and the voltage in the transverse winding depending on from the cosine of said angle and derivatives, characterized in that, in order to increase the stability of the operation of the machine, the voltage in the field windings is additionally changed by multiplying these functions by the linear th function altering rotor speed and its derivatives.

.2. Application of the TIO method and. 1 to automatically control the excitation of a machine with several excitation windings forming a multiphase system of windings whose currents vary in angular functions of the angle c.

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