公开(公告)号：US3551778A

公开(公告)日：1970-12-29

申请号：US3551778D

申请日：1968-11-27

Applicant: ASEA AB

Inventor： EKSTROM AKE

IPC: H02J1/00 ,  G05F1/56 ,  H02M7/155 ,  H02M7/757 ,  H02M1/08 ,  H02M1/18 ,  H02M7/72

CPC classification number: H02M7/7575 ,  G16H20/40 ,  G16H40/63 ,  H02M7/521 ,  Y02E60/60

Abstract: 1,238,720. Static electrical converter systems. ALLMANNA SVENSKA ELEKTRISKA A.B. 29 Nov., 1968 [1 Dec., 1967], No. 56711/68. Heading H2F. A D.C. and an A.C. network are interconnected by a converter controlled so that each rectifier therein is supplied with a control pulse when the period after the last control pulse to the previous rectifier in the commutation sequence, is equal to the A.C. network period divided by the number of control pulses per A.C. cycle. A member 6 (Fig. 1) derives the network period T by measuring the time between two consecutive zero passages of a phase voltage to give T/2; and divides the period T by the converter pulse number n, where n is 6 in present example. The line voltages are taken out by a transformer 61 the output voltage of which is phase shifted by a unit 62 so that it passes through zero a certain time before the respective line voltages of the network, i.e. a suitable time before the next commutation. A member 5 measures the time t since the last pulse from a pulse generator 18, which controls rectifiers 11-16 via a ring counter 19. The outputs of .5 and 6 are fed to a summation member 4, the output of which is fed to a comparator 7. When the outputs from 5 and 6 are equal there is zero output from the summation member 4 and the comparator 7 will emit a signal which is fed via gates 8, 9 to the pulse generator. A control pulse is accordingly fed to the appropriate rectifier. The output from summation member 4 may be modified by a regulator circuit 3 to vary the delay angle a in dependence upon the difference between the magnitude of the converter direct current and a desired value. The converter direct current is detected by a unit 30 comprises an A.C. fed coil coupled to the D.C. line and a rectifier. The desired value is set up on a potentiometer 33 and the difference if any is fed via a control amplifier 31 to alter the moment of zero passage of the output voltage from member 4 and consequently the times t 1 , t 2 &c. between the control pulses from the pulse generator and the delay angles a are altered. Units 81, 91, limit the minimum and maximum delay angles α respectively. The minimum limit unit 81 is connected to the AND gate 8 and ensures that the signal from comparator 7 cannot be passed to the pulse generator until a certain minimum delay angle has been passed. The unit 91 is connected to an OR gate 9 and delivers a signal to the pulse generator at the maximum limit if the delay angle from comparator 7 is too large. Instead of having fixed minimum and maximum delay angles they may be selectively variable to give a desired minimum commutation voltage U K and minimum commutation margin angle # (Fig. 4, not shown). If the A.C. network is asymmetrically loaded the regulator will. cause different periods between successive firing pulses. Thus the limit units 81, 91, are arranged to influence-electronic switches 82, 92-respectively. For instance when the minimum limit unit 81 becomes active for the first of the rectifiers, it is arranged to close switch 82 which via a diode 83 discharges. to earth any positive regulator voltage for a certain time and prevents the ignition of two subsequent rectifiers earlier than would occur with symmetrical loading. If a pulse from comparator 7 arrives before a pulse from 81 then a positive pulse from the regulator should be discharged through switch 82. If the pulse from 81 arrives first the regulator voltage must pass freely to the member 4. A logic circuit to control the switch 82 (or 92) from comparator 7 and unit 81 (or 91) is illustrated Fig. 4 (not shown). Similarly too. high a direct current can cause a negative regulator voltage and cause an increase in angle a and when it reaches an upper limit set by unit 91 any negative regulator voltage is discharged through switch 92 and diode 93 to earth so that two succeeding rectifiers cannot ignite later than with an interval of 60 degrees.

公开(公告)号：US3582755A

公开(公告)日：1971-06-01

申请号：US3582755D

申请日：1969-10-09

Applicant: ASEA AB

Inventor： LISS GOTE ,  EKSTROM AKE ,  LJUNGQVIST ROLF

IPC: H02M1/08 ,  H02M7/155 ,  H02M7/757

CPC classification number: H02M7/7575 ,  Y02E60/60

Abstract: A static converter connecting an AC network with a DC line has a control system in which an AC control function voltage is derived from the AC network, while a DC regulator voltage is derived from a regulator. The control system further comprises a first arrangement for deriving the actual time between subsequent following control pulses for the valves of the converter and a second arrangement for deriving a desired value for said time corresponding to the relation between the period time of the AC network and number of pulses of the converter. The difference between said actual time and its desired value is stored in a memory circuit for each valve and as a correction magnitude taken together with the control function voltage and the regulator voltage.

公开(公告)号：US3536985A

公开(公告)日：1970-10-27

申请号：US3536985D

申请日：1969-05-07

Applicant: ASEA AB

Inventor： EKSTROM AKE

IPC: H02M1/08 ,  H02M7/525 ,  H02M7/757 ,  H02M1/06 ,  H02M1/18

CPC classification number: H02M1/081 ,  H02M7/525 ,  H02M7/7575 ,  Y02E60/60

公开(公告)号：US3670236A

公开(公告)日：1972-06-13

申请号：US10943371

申请日：1971-01-25

Applicant: ASEA AB

Inventor： EKSTROM AKE

IPC: H02M7/757 ,  H02M7/00

CPC classification number: H02M7/7575 ,  Y02E60/60

Abstract: A converter station for high voltage direct current includes two substantially identical parallel converter branches provided with control systems therefore which limit the control angles of the converters of the branches upwards or downwards. A balancing arrangement is provided to assure equal current distribution between the two converter branches when they are forced so far in one direction that the limit value emitter for the converters of one of the converter branches becomes active. The balancing arrangement includes a device responsive to the difference between the current in the two branches to regulate the control system of the converter of the other branch. This arrangement may include cross connections between the limit value emitters to control converters of both converter branches.

Abstract translation: 用于高压直流的转换器站包括两个基本上相同的并行转换器分支，其设置有控制系统，因此控制系统的转换器的控制角度向上或向下限制。 提供了一种平衡装置，以确保两个转换器支路在一个方向上强制为远的转换器支路的转换器的极限值发射极变为有效时，两个转换器支路之间的电流分布相等。 平衡装置包括响应于两个分支中的电流之间的差异来调节另一个分支的转换器的控制系统的装置。 这种布置可以包括极限值发射器之间的交叉连接以控制两个转换器分支的转换器。

公开(公告)号：US3641356A

公开(公告)日：1972-02-08

申请号：US3641356D

申请日：1971-02-16

Applicant: ASEA AB

Inventor： EKSTROM AKE

IPC: H02J1/00 ,  H02H7/12 ,  H02M7/04 ,  H02M7/757 ,  H02J ,  H02M1/02

CPC classification number: H02M7/7575 ,  H02H7/1206 ,  Y02E60/60 ,  Y10T307/615 ,  Y10T307/707 ,  Y10T307/718

Abstract: A converter station for high voltage is formed of a plurality of static converters with a direct current side directed in series. Each converter is a full-wave rectifier bridge provided with a control device. An additional control device is provided with a reserve control for one of the converters, which controls two series-connected rectifier groups of the bridge with different delay angles, one greater and the other less than 90*. As a result the two series rectifiers in one phase of the bridge conduct simultaneously and current is commutated at a certain frequency from the rectifier in one phase of the rectifier bridge to the rectifier in a subsequent phase of the bridge.

Abstract translation: 用于高电压的转换器站由具有串联引导的直流侧的多个静态转换器形成。 每个转换器都是一个带有控制装置的全波整流桥。 一个额外的控制装置为一个转换器提供一个预留控制，它控制不同延迟角的两个串联连接的整流组，一个大于另一个小于90°。 因此，桥的一相中的两个串联整流器同时导通，并且在桥的后续阶段中，电流在整流器桥的一相中的整流器以一定频率被转换到整流器。