Control device for self-exciting current source power converter

• US 5,991,173 A
• Filed: 10/30/1998
• Issued: 11/23/1999
• Est. Priority Date: 10/30/1997
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Nishikawa, Hiroyuki
• Primary Examiner(s): NGUYEN, MATTHEW VAN
• Application Number:
  US09/182,515
• Time in Patent Office: 389 Days
• Field of Search: 363/34, 363/35, 363/37, 363/65, 363/67, 363/71, 323/205, 323/207
• US Class Current: 363/37
• CPC Class Codes: H02M 7/49 Combination of the output voltage waveforms of a plurality of converters

Abstract

A control device for a self-exciting current source electric power converter comprising a plurality of the self-turn-off devices connected in a bridge, and n-sets (n=a multiple of 2) of the electric source electric power converters, which convert AC into DC, or, convert DC into AC, wherein said converters are divided into two groups, an electric power regulating circuit, which controls the AC current of each converter, is provided for each group; an active current command value and the reactive electric power command value of all the electric power converters are inputted into the input side of the electric power regulating circuit respectively; at the same time, a positive arbitrary reactive power shift value (+Q) is added to one of the reactive electric power command values; a negative arbitrary reactive power shift value (-Q) is outputted to the other reactive electric power command values; and the both reactive power shift values are offset each other.

Claims

1. A control device for a self-exciting current source electric power converter, comprising:

n sets (n=a multiple of

     2) of current source electric power converter having a plurality of self-turn-off devices connected in a bridge, converting AC into DC or converting DC into AC, said n sets of current source electric power converter being divided into two groups;

an electric power controlling ciircuit for controlling AC current of each said converter, said electric power controlling circuit being provided for each group; and

a command means for supplying an active electric power command and reactive electric power command value of all said electric power converter to an input side of said electric power controlling circuit respectively, at same time a positive arbitrary reactive power shift value (+Q) being added to one of said electric command value by said command means, a negative arbitrary reactive power shift value (+Q) being outputted to the other reactive electric power command values by said means, said both reactive power shift values being offset each other.

2. A control device for a self-exciting current source electric power converter, comprising:

n sets (n=a multiple of

     2) of current source electric power converter having a plurality of self-turn-off devicces connected in a bridge, converting AC into DC or converting DC into AC, said n sets of current source electric power converter being divided into two groups;

all the DC current values of said respective converters being detected;

a half of the said total DC current value being assumed as the DC current command value;

the DC current of one group of the electric power converters, which are divided into two groups, being detected, said DC current value and said DC current value of the group being compared each other;

the deviation being proportionally integrated to compute the correcting value, said correcting value being subtracted from said active power value, and also said correcting value is added to said active electric power command value; and

gate signals for the respective groups of said electric power converters being obtained by performing a pulse width control basing upon said subtracted value and said added value.

3. A control device for a self-exciting current source electric power converter, comprising:

a plurality of the self-turn-off devices connected in a bridge, and n-sets (n=a multiple of

     2) of the electric source electric power converters, which converter AC into DC, or, convert DC into AC, wherein said converters are divided into two groups;

a multiple space vector control is performed by controlling positive switching devices and the negative switching devices alternately by a specific angle each in each of the groups of the electric power converters, and wherein;

all the DC current of said respective electric power converters are detected;

a half of said total DC current value is assumed as a DC current command value;

a positive DC current value and a minus DC current value of one of said groups of said electric power converters, which are divided into two groups, are detected;

said DC current command value and said positive DC current value of the group are compared each other; and

also said DC current command value and said negative DC current value of said group are compared each other;

said deviations are proportionally integrated respectively to compute said positive and said negative correction values;

said positive correction value is inputted into said circuit, which performs a multiple space vector control at the time of action of said positive switching device; and

said negative current correcting value is inputted into the circuit which performs a multiple space vector control.

4. A control device for a self-exciting current source electric power converter, comprising:

a plurality of the self-turn-off devices connected in a bridge and a converter which converts AC into DC and an inverter which converts DC into AC, wherein the DC side of said converter and the DC side of said inverter are connected each other;

said converter performs a constant DC current control by means of a current control circuit and said inverter performs an electric power control by means of electric power control circuit; and

wherein;

a DC current correcting circuit is provided, which corrects the DC current, which is an output of said converter, large or small according to the magnitude of said AC electric power, which is the output of said inverter.