JPH0274199A - Automatic voltage regulation device of generator - Google Patents

Abstract

PURPOSE:To suppress the voltage overshoot in starting a generator by providing to a voltage deviation detection circuit a voltage relay to turn ON a compensation circuit, which gives a specified time constant in raising set voltage, and a compensation circuit to detect that the output voltage of the generator is settled. CONSTITUTION:A voltage deviation detection circuit 7 controls in phase a gate circuit of a thyristor 3 by driving a phase angle control circuit 8 by the deviation voltage. At that time, as a compensation circuit 12 having a specified time constant is connected to the output side of a voltage deviation detection circuit 7, the output voltage of a generator 1 is settled, where the deviation voltage is reduced apparently by the inserted portion of a resistance 10 in the point of time the contact 11a of a voltage relay 11 is switched ON. This deviation voltage is gradually returned to the normal deviation voltage with a time constant of the resistance 10 and a capacitor 9. Thus, after the output voltage of the generator 1 got to the steady state, the firing angle phase signal of the thyristor 3 is controlled by the normal deviation voltage to bring the generator 1 to the steady-state operation.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an automatic voltage regulator for a generator that suppresses overshoot of the generator output voltage when starting the generator.

[Conventional technology]

Conventionally, there has been a block diagram of an automatic voltage regulator for a generator as shown in FIG. In the figure, 1 is a generator, 2 is an excitation transformer for supplying excitation current to the field winding 1a of the generator 1 by the output voltage of the generator 1, and 3 is an excitation transformer that controls the output voltage of the excitation transformer 2. 4 is an instrument transformer that transforms the output voltage of the generator 1, 5 is a voltage detection circuit connected to the secondary side of the instrument transformer 40, 6 is a voltage setting device, and 7 is the output of the generator 1 A voltage deviation detection circuit compares the voltage, that is, the output voltage of the voltage detection circuit 5 and the set voltage output from the voltage setting device 6, and outputs a deviation voltage. A phase angle control circuit that controls the arc angle phase; 13 is an initial excitation power source consisting of a battery; 14 is a resistor; and 15 is a bus bar. Next, the operation will be explained. First, the voltage deviation detection circuit 7 detects the deviation voltage between the output voltage of the generator 1 detected from the instrument transformer 4 through the voltage detection circuit 5 and the set voltage given from the voltage setting device 6, and the deviation signal is is given to the phase angle control circuit 8 as a phase control signal that controls the firing angle at a firing angle of 30 degrees. The phase control signal output from the phase angle control circuit 8 controls the firing angle of the thyristor 3 in accordance with the deviation voltage, thereby adjusting the excitation current supplied to the field winding 1a of the generator 1. , the output voltage of power generation IR1 is kept constant. Here, the initial excitation voltage for exciting the field winding 1a is supplied from the initial excitation power supply 13 via the resistor 14, and when the generator 1 enters steady operation, the excitation voltage is supplied via the excitation transformer 2. is given.

[Problem to be solved by the invention]

Since the conventional automatic voltage regulator for generators has the above-mentioned two configurations, when the output voltage of the generator I is in a low voltage state when the generator is started, there is a large deviation from the set voltage of the voltage setting device 6. Therefore, the thyristor 3 is fully ignited controlled by the phase angle control circuit 8, and therefore, there is a problem in that the output voltage of the generator 1 temporarily temporarily overshoots before being kept constant. As an approximation technique, there is a technique described in Japanese Patent Publication No. 54-17923 and Japanese Patent Application Laid-Open No. 55-117499. This invention was made in order to solve the above-mentioned problems, and the voltage deviation detection circuit 7 is provided with first-order lag element compensation in order to suppress the transient overshoot of the generator voltage at the time of starting the generator 1. The purpose is to obtain an automatic voltage regulator for a generator provided with a circuit.

[Means to solve the problem]

The automatic voltage adjustment device for a generator according to the present invention includes a voltage deviation detection circuit that includes a capacitor and a resistor, and a compensation circuit that provides a predetermined time constant for the rise of the set voltage, and detects the establishment of the output voltage of the generator. However, a voltage relay for turning on the compensation circuit is provided to suppress voltage overshoot when starting the generator.

[For use]

In the automatic voltage regulator of the present invention, the voltage deviation compensation circuit compensates for the voltage deviation at the time of starting the generator, and the set voltage at the time of starting is gradually increased to suppress the output voltage overshoot of the generator.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same parts as in FIG. 2 are indicated with the same reference numerals. In FIG. A voltage relay 11a is a contact a of the voltage relay 11 which is turned ON when the voltage of the generator 1 is established, and 12 is a compensation circuit constituted by each of the above-mentioned component parts. Next, the operation will be explained. First, voltage deviation detection circuit 7
As in the conventional case, the detected voltage of the bus 15, which is the output voltage of the generator 1, is manually input using the set voltage from the voltage setting device 6 and the voltage detector 5 provided via the instrument transformer 4, and both of them are input manually. Control the signal deviation voltage as close to zero as possible. Then, the phase angle control circuit 8 is driven by the deviation voltage to control the phase of the gate circuit of the thyristor 3. At that time,
A compensation circuit 12 consisting of a capacitor 9 and a resistor 10 and having a predetermined time constant is connected to the output side of the voltage deviation detection circuit 7, so that the output voltage of the generator 1 is established and the voltage relay 11 is activated. When the contact point 11a is turned on, the deviation voltage is apparently reduced by the resistance inserted. This deviation voltage gradually returns to the normal deviation voltage with the time constant of the resistor 10 and capacitor 9. Thus, after the output voltage of the generator 1 reaches a steady state, the firing angle phase signal of the thyristor 3 is controlled by the normal deviation voltage, resulting in steady operation.

【Effect of the invention】

As described above, according to the present invention, a compensation circuit including a capacitor and a resistor for suppressing overshoot of the output voltage of the generator when the generator is started is provided in the voltage deviation detection circuit, and the output voltage of the generator is Since the circuit is configured such that the compensation circuit is turned on by a voltage relay when the voltage reaches a steady state, an automatic voltage regulator with less overshoot of the output voltage of the generator can be produced at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an automatic voltage regulator for a generator according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional automatic voltage regulator for a generator. In the figure, ■ is a generator, 2 is an excitation transformer, 3 is a thyristor, 4 is an instrument transformer, 6 is a voltage setting device, 7 is a voltage deviation detection circuit, 8 is a phase angle control circuit, 9 is a capacitor,
IO is a resistor, 11 is a voltage relay, and 12 is a compensation circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Patent Issuer: Mitsubishi Electric Corporation (2 others)

Claims (1)

[Claims] A voltage deviation detection circuit compares the output voltage of the generator generated by the generator and the set voltage of the voltage setting device, and the field winding is adjusted based on the voltage deviation to maintain the output voltage of the generator at the set voltage. In an automatic voltage adjustment device for a generator that automatically adjusts an excitation current, the voltage deviation detection circuit includes a compensation circuit that includes a capacitor and a resistor and has a predetermined time constant for the rise of the set voltage; An automatic voltage regulator for a generator, comprising: a voltage relay that turns on the compensation circuit after detecting the establishment of the output voltage.