JPS5941174A - Phase controller for power rectifier - Google Patents

Abstract

PURPOSE:To enable to control the stable phase without influence between adjacent controlling power rectifiers to each other by suitably controlling the power rectifiers which are connected to the input side of the power rectifier for a main circuit. CONSTITUTION:The output voltage of a transformer 1a at a generating plant A side is converted from AC to DC through an insulating transformer 22a by a controlling power rectifier 23a. The output voltage of the rectifier 23a is inputted to a comparator 12a of a phase controller 5a and compared with the set value of a setter 11a. The controller 5a controls the phases of the rectifier 23a and a power rectifier 2a for a main circuit so that the output voltage of the rectifier 23a is equal to the set value of the setter 11. A phase controller 5b of a generating plant B side also controls the phase of the power rectifier 2b similarly to the rectifier 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a phase control device for an 11lii converter in a DC feeding system.

In general, DC NL systems use a system in which AC power transmitted from a power plant is converted to DC power by a converter such as a forward converter, and the DC power is supplied to loads such as electric cars via feeder lines. ing. An example of the configuration of this DC feeding system is shown in FIG. In Figure 1, transformer 1
The input sides of a to 1n are connected to an AC power source (not shown) of the A-N power plant, and the output sides are connected to the input sides of forward converters 2a to 2n. Output fil of forward conversion devices 2a to 2n
l is the feeder wire 4a to 3n via the thyristor circuit breakers 3a to 3n.
C order conversion device t2a connected to 4n as shown in the figure.
~2n between the control side and the output side are phase control devices 5a~5.
n is connected.

The phase open side 1 device 5a is configured as follows.

That is, a comparator 12a that feeds back the output of the forward conversion device 2a and compares the feedback value with the setting value of the setting device 11a, an automatic voltage regulator 13a that amplifies the output of this comparator 12a, and this automatic voltage A phase shifter 14 that performs phase control based on the output of the regulator 13a.
A and a gate circuit 15a that amplifies the output of the phase shifter 14a and sends a gate signal to the gate of the forward converter 2a are connected in sequence to the IH column. Phase control device 5
b to 5n are also constructed in the same manner as the phase control device 5a, so the explanation thereof will be omitted. 10 indicates an electric car. In the DC feeding system configured as above, the electricity cost l
When O is running on the illustrated position of feeder line 4C, Jin's electric car 10 is supplied with AC power from power plant A (not shown) via transformer 1a, forward converter R2a, and thyristor circuit breaker 3C. eC to N power plants (not shown) are supplied with power supplied from the AC power source (not shown) of power plant B through the transformer 1b, forward converter 2b, and thyristor circuit breaker 3f. ) forward conversion device 20~
2n is in a no-load state as shown in the figure, so the amount of power supplied is limited. At this time, the voltage of the feeder a40 is
Since power consumption is carried out in As a result, the amount of feedback to the phase control device 5a becomes smaller than the set value of the setter 11a, so the phase control device 5a performs phase control to increase the amount of gate current supplied to the forward conversion device 2a. At this time, forward conversion device 2
The output voltage of the device 2b decreases because the output side of the device 2b is connected to the fi+N40 via the thyristor circuit breaker 3f. Then, the amount of feedback to the phase control device 5b changes, which affects the phase control of the 11-day conversion device 2b. In other words, the feedback points of the phase control devices 5a and 5b adjacent to each other are the same t#i! Since it is located on 4C, phase control during parallel operation is affected by 4C, such as feedback from one forward converter with a high output voltage can almost change the phase angle of the other forward converter. However, there was a drawback that control became unstable.

The present invention has been made in view of the above points, and a control forward converter is commonly connected to the input side of the main circuit forward converter, and the output type and pressure of the control forward converter are set to a preset value. By controlling the phase of the main circuit and the control converter so that they are at the same level, and by making the set values of the output voltages the same for adjacent substations, the main circuit of the adjacent substation is It is an object of the present invention to provide a phase control device for a /IIα conversion device that can perform stable phase control without being affected by fluctuations in the output voltage of the conversion device.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, the same parts as in FIG. 1 are denoted by the same reference numerals, and the explanation thereof will be omitted. The control forward converter 2 is connected to the common connection points 21a to 2in of the transformers 1a to 1n and the main circuit forward converters 2a to 2n via isolation transformers 22a to 22n.
The input ends of 3a to 2:3n are connected. The output terminals of the control forward conversion devices 23a to 23n are connected to the comparators 12a to 12n of the phase control devices 5a to 5n.

Gate circuits 1ba to 151 of phase control devices 5a to 5n]
The output side of is connected to the control ends of the main circuit forward converters 2a to 2n and the control forward converters 23a to 23n. Next, the operation of the device 6 configured as described above will be explained. While the electric car 10 is currently running on the illustrated position of the feeder line 4C, this electric car 10 is connected to the AC power source of power station A (not shown).
Electric power is supplied from the transformer 1a, the forward converter 2a, and the thyristor circuit breaker 3C, and the AC power supply (not shown) of the B power station is supplied through the transformer 1b1, the forward converter 2b, and the thyristor circuit breaker 3f. The electricity generated by the system is also supplied with electricity. At this time, the output voltage of the transformer 1a on the A power plant side is converted into a control converter flow via the isolation transformer 22a. The output voltage of this control converter 2; Phase control of the control forward converter 23a and the main circuit forward converter 2a is performed so that the output voltage becomes equal to the setting value of the setting device 11a.
The phase of the forward converter 2a is controlled by comparing the input voltage of the input voltage a with the setting value of the setting device 11a via the control forward converter 23a.

Further, the phase control device 5b on the B power plant side also performs phase control of the forward conversion device 2b in the same manner as the device 5a. Therefore, even if the voltage of the feeder line 4c connected to the output side of the forward converter 2a and the forward converter 2b decreases due to power consumption of the electric vehicle 10, the forward converter 2a remains unchanged.

2b allows stable phase control without being influenced by each other.

As described above, according to the present invention, the transformer and the first forward converter 4'' are connected in sequence to the electric line connecting the AC power supply and the DC feeder, and the first forward converter 4'' and the front A second terminal connected to the common connection point of the transformer through insulation degree 11:
The output voltages of the forward converter and the second +1m converter are compared with a preset value, and the output voltages of the first and second +1m converters are compared until the output voltage of the second ays converter and the set value are at the same level. Since the present invention includes a phase control circuit for controlling the conversion devices Wㅅ) and A, it is possible to perform stable phase control without adjacent forward conversion devices being influenced by each other.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an example of the configuration of a DC feeding system.
FIG. 2 is a circuit diagram showing one embodiment of the present invention. 1a-1n...Transformer, 2a-2n...Director converter, 3a-3n...Thyristor circuit breaker, 4a-4n...
・Feeding wire, 5a to 5n...Phase control device, 22a to 2
2n...14 edge transformer, 23a to 23n/e9 control forward conversion equipment.

Claims (1)

[Claims] A transformer and a first forward converter are inserted in sequence in an electric path connecting an AC power supply and a DC feeder, and a first forward converter is connected to a common connection point of the first forward converter and the transformer via an isolation transformer. The output voltage of the second forward converter and the twenty-first converter are compared with a preset value, and the output voltage of the first and second forward converter is 1. A phase control device for a forward conversion device, comprising: a phase control circuit that controls the phase of the two-order conversion device.