SU877780A1 - Method and device for regulating output voltage of current inverter with self-excitation - Google Patents

Description

Due to the fact that the maximum advance angle of the inverter is a function of a predetermined voltage, the initial advance angle for each value of the predetermined voltage will automatically occur and this will ensure the minimum time for the inverter to start.

Devices are also known to implement various methods for controlling the inverter.

One of such devices contains a voltage regulator, the output of which is connected to the control input of the inverter, a voltage sensor in the load circuit, the output of which is connected to the input of the comparison node of the specified output voltage value with its actual value, and the output of the comparison node is connected to the input voltage regulator El.

The closest in technical essence to the present invention is a device for automatically controlling the output voltage of an autonomous current inverter with self-excitation, which contains a comparison circuit, one input of which is connected to the voltage source of the task, the other is connected to the output of the inverter, having inputs limiting the minimum and maximum angles associated with the inverter "3.

The disadvantage of such a device is the impossibility of obtaining optimal in speed starting processes in autonomous current-carrying inverters with self-excitation.

The purpose of the invention is to reduce the time of the transient start-up of the inverter by obtaining optimal performance processes for the start-up of autonomous inverters with self-excitation in the entire range of the change of the reference signal.

The set goal is achieved by the FC unit. A division block and a functional converter are inserted into the known device, with one input of the block for connecting to a voltage source of the reference, the other to the input of the inverter, and an output through a functional converter connected to the input of limiting the maximum angle of the angle limiting block.

The drawing shows a block diagram of a device that implements the proposed method.

The device contains a controlled rectifier 1, the output voltage of which is fed to the input of an autonomous inverter 2 current.

The output voltage of the inverter (the actual value is compared with the reference signal and fed to the input of the regulator 3. The output signal of the voltage regulator (Fig. 2) is limited by the block 4 limiting the angles of the maximum p rnoix

and the minimum ft xjy, the value and comes to the control input of the inverter 2. The value (and is chosen from the need to ensure the switching stability of the inverter and is a constant value, const. The maximum value of the advance angle is variable and is formed, depending on the ratio-: 1 and a predetermined voltage to the inverter supply voltage. The ratio signal is generated by dividing unit 5 and is fed to the input of the function converter 6. The output signal of the function converter is the measurement Nt is the maximum value of the advance angle Rkpa

When the inverter starts, depending on the voltage value of the reference, the control device selects the optimum starting angle, which reduces the start time.

Claims (3)

1. The method of controlling the output voltage of the inverter with cilo-excitation, which consists in measuring the output voltage, comparing it with a predetermined voltage, forming the inverter advance angle depending on the difference of the aforementioned voltages and limiting the minimum and maximum advance angle values In order to reduce the time of the transient process when the inverter starts, the voltage of the inverter is measured, the ratio of the set voltage to the voltage of the inverter is determined the torus and form the level of limiting the maximum value of the angle of presentation in the function. this relationship. 2. A self-excited current inverter output voltage control device containing a Comparison unit, one input of which is connected to a reference voltage source, the other connected to the output of the inverter, and the output through an angle limiting unit having inputs of maximum and minimum angles A synchronizer, characterized in that, in order to reduce the transient time when the inverter starts, a dividing unit and a functional converter are inserted, with one input of the dividing unit connected to the power supply Arrange the assignment, the other to the input of the inverter, and the output through the functional converter is connected to the input of limiting the maximum angle of the angle limiting unit. Sources of information taken into account in the examination 1. Kovalev F.I. Stabilized standalone inverters with sinusoidal output voltage. M., Energie, 1972, p. 135, rice, 5.1. 2. USSR author's certificate  531243, cl. H 02 R 13/18, 30.12.74. 3.Berkovich E.I. and others. Thyristor converters of high frequency. L., Energie, 1973, p. 169, rice .. 2 ass (rig .;