JPS5819172A - Controller for ac/dc converter - Google Patents

Abstract

PURPOSE:To enable to continue normal operation even when one current transformer is defective by supplying the detection outputs from a DC constant current control system of a controller and a DC constant voltage control system or an allowable angle control system from different current transformers. CONSTITUTION:When one 25 of DC current transformers 25, 26 becomes defective, no detection output is applied to the constant current control circuit 23A of a control circuit section 22A, the constant voltage control circuit 24B of a control circuit section 22B and an allowable angle control circuit 25B. However, a normal detection output is fed from a DC current transformer 26, and an AC/ DC converter 21 is controlled by the circuit 23B and 24A or 25A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention attempts to improve the reliability of a converter with respect to the converter.

This type of itt+n device is conventionally shown in Figure 1, which has (1) a current transformer bus, (2) converts the AC input of the α AC bus melt (1) to DC, and converts the AC input of the α AC bus (1) to DC positive electrode, one button pull, and the DC Return W
H group (4) K is an AC/DC converter with 0 thyristor transformers that escapes, (6) is a friend AC/tortoise pressure transformer installed in the AC system,
(6) is the DC voltage transformer installed in the II flow positive pole path (8), (η is the DC current transformer installed in the return w1 line (m DC current transformer (7') is the DC current transformer (7') The constant current adder (9) subtracts from the output t-II current command value I, and (9) is the output of the DC voltage transformer (6).
A constant voltage system adder that subtracts the output from the m adder (8), and an amplifier for the direct current control system (b) that amplifies the output of the m adder (8).
is the output kjllm of the nasal dilator (9)
The compensation for the system amplifier is the output of the AC voltage transformer (6), the output of the DC current R (η), the margin angle setting ffL r and the margin angle control to deviate the margin angle WN# output from the power supply. , 0 is the output of DC voltage transformation (6) and DC 4-current Takenari (7) to calculate the lower wax pressure in DC fiber formation and subtract it into DC voltage M addition 11 (9). Given as, 611 [flow IUI voltage voltmeter lower pointer circuit 4 is stage lil!-4 and (
b) Output and margin angle control - Output of pedal (to) and t receiver 4I
The voltage selection circuit (to) generates a gate pulse to the φ machine converter (b) based on the output of this voltage selection path (2).

Next, the operation will be explained. lI current current control system, current command value, and KILN flow transformation-(Gin output and t addition Jll fp (8)
The output is amplified 111 and given to the voltage selection circuit aIK. -111IIl- system has 11E pressure command value v8, the output of DC voltage transformer (6), the output of DC 4-current Takesakamoff), and the DC tIt voltage transformer (6). ) From the output of the DC line voltage drop needle JlIgJ path (to), calculate it with i and the voltage drop output of the line t. Apply voltage selection bwsata. Furthermore, the margin angle control system controls the margin angle setting position r6, the output of the AC voltage transformer (5), and f
Based on the output of the L-current current transformer (7), the margin angle 11 [
111Ljll! The margin angle control voltage is generated in the circuit (to).

When the voltage selection diagram TIf1σ is used, the manually applied voltage is softened, the voltage is set to a high voltage of 0, and the gl-1tτ of the voltage is selected and output to the pulse phase shifter. According to the box phase t% one gate pulse busy envy (2)
α current k applied directly to the gate of the thyristor with amc voltage t
iitl groan.

Since the conventional 0liI1411 device is configured as described above, the DC voltage transformer (7) itself will not be able to operate in the DC constant voltage ItWfiJ control system when a fault occurs and the output is cut off. This will affect the deviation of the DC constant voltage control system and margin angle control system, making normal operation impossible.
As a result, excessive voltage and current are generated from the 4th unit (Z), and vhK is maintained! This could lead to an accident in which the vehicle stops in response to a stop command from the I device. However, recently I
In addition to the saturable reactor type, itlI flow transformers often employ semiconductor-based systems such as the Hall transformer type and the optical type, so in addition to the transformer type, the transformer itself There is a high possibility that the number of defects will increase.

In this way, conventionally there was only one
Continuing the luck of -, I often have a disadvantage.

In addition, in the past, attempts were made to multiplex the controller to improve the individuality of the control device, and VH4 was developed as
The output of the DC pressure transformer is very high.

The above-mentioned disadvantages cannot be removed by simply connecting the multi-step fi+tK series or t in parallel, and it cannot be said that this is sufficient.

The present invention has been made to eliminate the conventional tao points such as Ren 7? , %- so multiplex the direct current tI to the nine system #- direct
By devising the method of folding the output of the L transformer, II
This is an attempt to provide a control device that is even more controllable.

111 of the present invention regarding FIG. 2, in which parts opposite to those in FIG. 1 are denoted by the same reference numerals. Let me explain an example.

1gJJ is an AC/DC exchanger, with multiple gears built in on two transformers, whose Kfi terminal is MI4 connected to the common DC positive electrode stratification (8) and DC feedback -M (4), and the AC terminal is connected to the AC 'II g fa # (1) K connected. However, it is said that the one-sword transformation device is the one that operates wjL transformation transformation, and is controlled by the control device, and the transformation of other power is the one that operates the reverse transformation, and the transformation is driven by the drama 1j1-Roichi. Constant voltage control or margin angle control.

Here, since the individual order of operation is the same as above, the 1-m position is converted into a ljl unit, that is, the DC constant current control circuit (26 m) is installed in each of the kjllm-tA.
)and.

DC constant voltage v4 both circuits (24mm) e (24B) and margin limit circuit (25mm) s (25B) and t control circuit section (22mm) @ (22] 1) It becomes.

However, direct fi constant current side cape circuit (25mm) l (25B)
σ AC/DC converter - O forward side converter busy constant current control, linear constant voltage side n times M (24A) l (24B) and margin angle - control S circuit (25μ) e (25B ) Constant voltage control or margin angle control is applied to the inverse transformer transformer of the alpha transformer.

The DC positive electrode melting (8) of the AC 1 KK supply and song is the
22m> * A common O1I current transformer is provided at (22B), and the O detection output is the constant current control oI LglM (25A) of the control circuit section (22m).
IEIjlil (2211) 0fit pressure IQ--M
(,24B) and margin angle gi+um+circuit (zsm)
and based on this Yokode output IIcfI, fiII
%A is made to excite J4II. Also, as in 1), change the DC 4I/ of the DC return to the AC supply device (2) O DC return #16-path (4) Kα control circuit section (22MU)
) is provided in the device, and its detection output is the control -1f! +m(
22mm) constant voltage 111 control circuit (24mm), margin angle l111fII1 circuit (25mm), and control circuit section (25mm).
B) is applied to the constant current control Ig1M (26B), and the dramatic operation is performed based on this detection output.
Ru.

In the above 4 or P-, if either the DC voltage transformer or the output voltage is damaged, poor contact of the terminal block, WR false sound of the control) will occur. The deviation is caused by the constant current control circuit (25 m) of the control 1111Jl circuit (22 m) which received the detection output at this time, and the control 111 Jl circuit (25 m) which received the detection output.
III 11 (22B) constant voltage control am (24
11) Extra margin angle! IIl groan 1gl g (25B)
Since the detection output no longer arrives, control becomes difficult.

Since there is a normal detection output from Kamishiko's current transformer, the father direct conversion #Ib-0
Order R111! The Confucian converter is the electric current in the control circuit section (22B) (2511). Constant voltage control by voltage control circuit (24mm) or margin angle control operation (25mm) 11. ．． I-turn or margin angle control operation is performed.

In this way, when obtaining the detection output from the 9th and 11th control all-in-one AC/DC converters, even if one of the 70th aSS fails, the other detector, which has been made into a mains unit, will receive an output. You will be able to operate the 4-wheel direct change II unit normally.

On the contrary, if a failure occurs in the electric fll reward@(14), the constant current of the control I11 circuit (circuit section 2)--circuit (2)
The forward conversion operation is performed by the a-circuit part (2).
2B) constant voltage ffyIl control circuit (24B) and margin angle control circuit (251m) are switched to reverse conversion operation.

In this case, 45e[ff1ll@ttJJu can continue rolling normally.

In addition, in the above-mentioned output 31, the current input k[f
Describe a method to obtain i from mother m.
You may set up an L weapon and use the input from this, and
Even if n is a combination of a direct current transformer and an alternating current i converter and is used as an input to a quintuple device, the same effect as the above combination can be achieved. According to the present invention, as shown in FIG. Since the 11c partial transformer is provided with 4 components as shown in 6, even if one 11c partial transformer fails, it is still possible to operate the 11c direct transformer normally, thus making it even more reliable. A high control V device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional AC/DC Rv 14-wheel drive control device, and FIG. 2 is a block diagram showing an example of an AC/DC Rv 14-wheel drive control device according to the present invention. (1): Father flow mother @ (g): AC/DC converter <a
): I! L positive pole iI jump (4): DC return path (5) two-way flL'#L voltage transformer (6): DC voltage transformer (γ) = district current transformer 11L transformer (8) * (9)
: Adder -, (B) : Amplifier (2) : Margin angle control circuit n: ttaii* is reduced by s ttxum (4) = II! Opportunity selection Ig circuit - (2): No (Russ phase amazing cm: 5e J [Converter Rinny Goyuba 1
(25A), (25B): Constant voltage filltAl! a
l1M (25mm) * (2Sn): Margin angle control circuit (to), -: DC current transformation - Agent 4 field bias - Figure 1 Figure 2

Claims (1)

[Claims] The DC terminals of a plurality of i-channel devices are connected to a common DC line,
5 AC terminals! ! It has an AC/DC converter connected to the current power supply, and is configured to perform forward conversion operation on one side and reverse conversion operation on the other conversion, and is provided with a plurality of control circuit units for the Oshidani conversion music. Each of the above control circuit sections is equipped with a DC constant current tLItitl# thread, a DC constant voltage control system, a margin angle 11 control system and t, and the -1 DC constant current side - system ri1f of the above control circuit section 11. A detection output is obtained from the first current transformer provided in the current positive pole iIj circuit, and a detection output is obtained from the second current transformer provided in the DC return railway in the DC constant voltage control system and margin angle control system, and the above-mentioned side l! A detection output is obtained from the second DC current transformer to the other constant current current control system of the 9-circuit mouse, and a constant DC voltage? ! yII
The detection output is obtained from the first current transformer to the In system and the margin angle control system, and the forward conversion side conversion of the AC/DC converter is performed by the upper le DC constant current control system. A control device for an alternating current switching device in which the AC/DC converter O is inversely variable.