SU678625A1 - Synchronous generator self-excitation and voltage regulation device - Google Patents

Description

one

The invention of fire ogons to the field of electrical engineering and can be used in control systems of electric machines of alternating current, for example, in ship synchronous generators operating on active-inductive load.

The known devices of self-excitation and voltage regulation of a synchronous generator with a stator, the windings of which are connected by a star, the excitation voltage of which is provided during a short-circuit of the line bus due to volt-auxiliary transformers 11.

The disadvantage of such devices is the direct connection of low-current control circuits to the high-current circuit of the generator, which causes inconvenience in the constructive embodiment of the control circuits.

Another known device for providing all modes of the generator has on the stator of the exciter an additional winding connected through a type

A history converter with an independent AC power source 121.

The disadvantages of this device are the complexity of the design of the driver and the presence of an additional power source.

The closest technical solution to this invention is a voltage regulating device for a synchronous generator, the stator windings of which are connected by a star with a zero out, consisting of a regulator (exciter) connected to the field winding, short circuit sensor, rectifier and transformer, primary the winding of which is connected to the linear terminals of the generator, the secondary winding is connected by an open triangle and connected to a rectifier, the output of which is parallel with the output of the exciter; Inonii generator field winding with PP.

Claims (3)

This device eliminates the drawback of devices with a transformer, the windings of which flow around the generator current, and maintaining the excitation voltage during a short circuit is provided by a special connection of the transformer baffles on the primary and secondary side in such a way that during a short circuit on the linear buses at the transformer output the voltage of higher harmonic components appears. However, in this device, upon the assimilation of phases or their uneven loading, the output voltage of the rectifier appears, which causes malfunction of the controller. The regulator also disturbs the generator voltage waveforms, which are formed by the nonlinear elements of the regulator. The elimination of this effect is carried out with the help of specially installed filters, which impairs the overall dimensions and reduces the efficiency of the entire device. In addition, the disadvantage is the constant connection of the transformer, which causes additional losses in the device, since the primary winding of the transformer, which is permanently connected to the terminals of the generator, causes a loss of idling. Switching in series with the primary winding of capacitors only partially reduces losses and makes it impossible to control the excitation voltage during a short circuit. The purpose of the invention is to improve the quality of the electrical power of the installation and increase its efficiency. The goal is achieved by inserting alternating current keys into the device, connected between the controller input and the generator zero output, the key control circuits connected to the current sensor of which is closed, and the second ends of the transformer primary windings are also connected to the controller input. performed by the phase voltage of the generator. Taicoe device performance allows to maintain the voltage during a short circuit of the generator, to improve the quality of electricity due to the reduction of switching distortion caused by the controller, as the induction of the primary windings is connected in series in the regulator power supply circuit and parasitic losses of idling in the transformer are eliminated The drawing shows the layout of the device. The device contains a voltage regulator 1, made for example on thyriotors, a transformer 2, whose primary windings are with one Torons connected to the thyristor regulator voltage through the switches 1 and 3 with zero sinhronnogh) generator 4, on the other hand - to the line terminals of the generator. The switches 3 are controlled by a short circuit sensor 5, which can be a zero voltage relay or a short circuit current regulator. The secondary winding of the transformer 2 is connected to the rectifier 6, the output of which is connected in parallel with the output of the voltage regulator to the excitation winding 7 of the synchronous generator 4. The device operates as follows. The voltage regulator 1 provides self-excitation from the residual voltage of the generator 4 and maintaining its output voltage. In this case, the excitation voltage is changed in accordance with the law of regulating the voltage regulator. The excitation voltage of the transformer 2 circuit - rectifier 6 is absent, because the keys 3 cut off the power supply of the transformer 2 by alternating voltage, as well as by connecting the secondary windings according to the open triangle circuit. When a short circuit occurs, the sensor 5 turns on the keys 3, the primary windings of the transformer 2 are connected to the phase voltage of the generator, and the output of the rectifier 6 generates an excitation voltage proportional to the harmonic component of the phase voltage. The regulator 1 stops powering the field winding, since the field winding and the controller are shorted by keys 3. The field voltage is regulated and the duty cycle of the keys 3 is controlled by controlling the short-circuit sensor 5. Transformer 2 can be performed as in a three-phase version, as shown in the drawing, and in single-phase. Sending a capacitor to the primary winding of a transformer enhances the filtering properties of transformer 2. Comparative testing of the device proved that the losses in the control device for a generator with a capacity of up to 100 kW are reduced by 50%. Invention A device for self-excitation and voltage regulation of a synchronous generator, the stator windings of which are connected by a star with a zero axis, contains an excitation regulator supplying the excitation winding, a short-circuit sensor, a rectifier and a transformer, the primary windings of which are connected at one end to linear clamps generator, and the secondary windings are connected in an open triangle and through a rectifier are connected to the generator excitation winding, in which, in order to improve the quality and electricity. energy and efficiency increases, AC switches are inserted between the controller input and the zero output of the generator, the control circuits of these switches are connected to the short circuit sensor, and the second ends of the transformer primary windings are connected to the controller input. Sources in (| x) ments, taken into account during the examination 1. Copyright USSR № 112797, cl. H 02 R 9/38, 1956. 2. USSR author's certificate number 337898, cl. H 02 R 9/14, 1970. 3. Authors certificate of the USSR 139359, cl. H 02 R 9/38, 1959.