DE1922501C3 - Arrangement for dynamic balancing of an actuator consisting of an ignition angle control device and a converter controlled by this with natural commutation - Google Patents

Description

4. Arrangement according to one of claims 1 35 point 12, but only at time 1 3 takes place. The up to 3 with a control device, thereby interval / 3 -ί2, corresponds to the time that the control device simultaneously expresses the ignition angle λ 2. Another adjustment takes over the function of the limiter (7). development of the ignition angle close to the control limit

5. Arrangement according to one of claims 1 i3-180 ^c takes place at the intersection of the positive to 4, characterized in that the current 40 phase voltage 2 and U 3 (time f 4). Characterized a kreisstroinfreier Umkehrstromrich- judge (5) the commutation of Ul to U 3 is further provided verter. hesitates, and this commutation is now

6. Arrangement according to one of claims 1 more in the negative phase intersection 1 5. So that up to 4, characterized in that the converter works fully in the inverter (5) as a circular current reversing current 45 operation.

judge is provided. In Fig. Ib the reverse process is as in

7. Arrangement according to one of claims 1 F i g. 1 a shown. The converter is up to to 4, characterized in that the current instant r6 with the ignition angle »1 = 180 ° im judge (5) a direct converter is provided. Inverter operation controlled.

50 At time 1 7 the ignition angle is adjusted to «2 = 105 ° and at time 1 8 to a3

= 0 °. So that the converter operates from time 1 to 8 in the rectifier operation.

A comparison of the time interval τ in FIG. 1 a and

The invention relates to an arrangement for 55 I b, which is used for reversing between the two

dynamic balancing of one of the ignition modes elapses, shows that the control

angle control device and one controlled by it from inverter to rectifier operation

Power converters with natural commutation are best done several times faster than the control

towards the actuator. from rectifier to inverter operation.

The dynamic quality of a control loop is noticeable

as is well known, the better, the greater the range of reversals between the two operating modes,

closed loop is. Usually, the changeover from rectifier to

as a measure of the dynamic control loop quality, the time inverter operation of a voltage reduction and

interval, which elapses until the actual value X changes the direction from the inverter to the rectifier

after a sudden change in the setpoint value W 65, rectifier operation corresponds to an increase in voltage,

the new setpoint value for the first time ^{reached 1} , (This shows that the converter actuator is on

regular time). An increase in the bandwidth and control commands to increase the voltage in proportion

with an improvement in the control loop quality, however, it responds quickly and to control commands for clamping

³ 4

voltage reduction reacts relatively slowly, current-free reversing converter provided. at

d. This means that the adjustment takes place at a finite speed - this application can, as with the following

with the required time interval depending on the application, the bandwidth of the

Adjustment angle in the direction of inverter operation pro-circle increased after the balancing and thus

is portional. The adjustment speed in direction 5 the dynamic behavior can be improved.

Inverter operation cannot be accelerated. Another possibility is that as

the. In the following, this type of adjustment is intended as a converter, a reverse current

natural adjustment. "Right is provided. The resulting here

It can also be seen that this so-called dynamic advantage is that the size

Mixed asymmetry of the converter actuator io or the type power of the circulating current used

large so large is "j _e of the voltage jump of the throttle can be reduced, thereby tech-

Converter input signal (this asymmetry is reduced in terms of niche and financial outlay

Fig. La and 1 b) is shown. A corresponding will be.

The dynamic asymmetry increases. Another possibility is that as a direct converter is also provided when the bandwidth of the converter is increased. Converter input signal. If one tries, therefore, here the economically usable upper Frewie mentioned above, the dynamic control quality of a frequency limit for the operation of the direct converter er control loop with an actuator that increases a current.

judges with natural commutation as well as an is is known ("Elcktro-Welt", I ¹ W, off ignition angle control device, through a band 20 would give B, No. 2. pp. 31 to 34, Fig. 21) with an increase in speed To improve, one causes regulated reversing drives a setpoint integrator also to use an increase in the dynamic Un-, which between the speed setpoint symmetry of the actuator and thus a total value transmitter and the Soüwert-actual value comparison element worsen the control loop dynamics. is arranged. This setpoint integrator serves in-

It is the object of the invention to provide a switching device not for dynamic balancing of the

niche possibility to improve the shielded converter, but to avoid over-

th dynamic properties of an arrangement cause the permissible drive acceleration to be exceeded

Specify the type mentioned at the beginning. any faster adjustment of the setpoint. "

According to the invention, the object is thereby achieved. With the aid of the measures according to the invention triggers that the ignition angle control unit a limiter 30 makes it possible to dynamically increase the current for the rate of increase of its input variable. converter output signal of the dynamic decrease upstream and adjust the limiting value of the rise in such a way that the adjustment in direction speed is dimensioned so large that a rectifier operation does not go faster than sudden change of its input size in Rieh- the natural adjustment in the inverter utng Rectifier operation of the converter, the operation and thus the bandwidth of the relevant Setting of the ignition angle in the direction of the rectifier control loop and the control loop quality are independent operation of the natural adjustment of the ignition angle from the dynamic change in the setpoint Approximately in the direction of inverter operation. It has been shown that thereby the upper is equal. Frequency limit for reversing converters of 25

In an embodiment of the invention, 40 50 Hz and, in the case of low-circulating current, reverse current direction is proposed, that the limiting value of the rise yaws can be increased to 65 Hz, whereby a speed of the limiter is dimensioned so large, particularly economical use of electricity that in the event of a sudden change in its setting up with natural commutation as the control variable is made possible in the direction of rectifier operation of the circular elements.

Converter, the adjustment of the ignition angle in 45 The invention is based on the in the drawing

Direction of rectifier operation somewhat slower than the illustrated embodiment explained in more detail; it

natural adjustment of the ignition angle in the direction

Inverter operation is. The resulting dif- F i g. 2 a block diagram of a control loop,

Fig. 3 is a block diagram of a converter setting

is sufficient that the dynamic circulating current is safely divided with the limiter according to the invention,

is pressed and as a result the effort for the In F i g. 2 shows a known control loop

Chokes can be reduced. a comparison element 1, a controller 2 an actuator

According to a further development of the invention, the element 3 and a section 4 are provided. That issue

limiter designed in such a way that it will only change the signal of the system 4 (control variable X) to the Ver

its input variable in the direction of rectifier operation 55 is fed to the same element 1, which controls the controlled variable A

is effective. The input variable for a change in (actual value) with the reference variable W (setpoint) ver

The direction of inverter operation can be any equals. The diflerence value x _w = WX (rule from

Have a steepness without the ignition angle deviation) is sent to the controller 2 as an input signal

lung performed faster than the natural adjustment of the, in turn, with a change in its ignition angle inverter operation ER- 60 output variable (manipulated variable Y) responds. Through di

follows. This results in a maximum bandwidth for the manipulated variable Y , an adjustment of the distance <

Control loops achieved with converter actuators. carried out by the actuator 3 until di

An advantageous option for the configuration of the controlled variable X corresponds to the reference variable W,

of the invention is that in an arrangement The in F i g. Actuator 3 shown in FIG. 2 is in FIG. 3 a tion of the type mentioned at the beginning with one control hand of a converter with natural picking

device this control device at the same time the animal shown in more detail.

Takes over the function of the limiter. As shown in FIG. 3 shows, there is the actuator

Preferably, the converter is a circular converter from the converter 5, the ignition angle of which is from dei

Control unit 6 is changed. The input of the ignition angle control unit 6 corresponds to the actuator input, and the output of the converter 5 corresponds to the actuator output. According to the actuator 3 of the limiter 7 is connected upstream, the the rate of increase of the control command in the direction of rectifier operation is limited to a value, which corresponds to the value of the speed of the natural adjustment in inverter operation.

This means that the limiter 7 is set so that in the event of a sudden change in the input signal Y 1 in the direction of rectifier operation, the rate of increase of the input variable YZ for the ignition angle control device is such that it does not exceed a maximum speed that corresponds to the speed of the natural adjustment in the inverter operation is approximately the same value.

In this way, the faster rate of voltage rise in Direction of rectifier operation to the system-related, slower voltage drop speed in Direction of inverter operation (natural adjustment) of the converter 5 and thus a dynamic one Forced symmetrization.

The output characteristic (limiter characteristic) of the limiter 7 is expediently chosen so that that the input characteristic (internal characteristic) of the ignition angle control unit 6 is taken into account: the dependency between the input signal (control voltage) and the output signal (Ignition angle) be linear or run according to a cosine function. When changing the input signal i (Control voltage) after a time function, the output signal (ignition angle) changes linearly or cosine-shaped as a function of time.

For this purpose 4 sheets of drawings

Claims (3)

in the present case only possible if the patent claims dynamic behavior of the actuator of a verb patent claims. J_ .0-, 0gen can be. J ^ g 1. Arrangement for dynamic balancing When using converters with a natural angle control unit and a 5-licher commutation and the associated ignition of this disturbed converter with natural-angle control units as actuators, the actuator has timely commutation, (dissertation by D u 11, "the brushless DC motor characterized nut in that the gleichstromerregtem flywheel and subordinate Stan-Zündwinktisteuergerät (6) a limiter (7) for derstrornregelung" Technische Hochschule Darmdie increase in velocity of its input size io city 1964) that the rise time at sechspuls.gen (Y upstream 2) and the limiting value of the converter control elements is dimensioned so large in the most favorable case at the rate of rise in the directional operation 8 ms and in the case of reverse operation 15 ms that in the event of a sudden change in its rate. output size (yi) towards rectifier operation The reasons for these unfavorable properties of the converter (5) the adjustment of the ignition 15 of the known converter actuators are angle in the direction of rectifier operation of the same high response speed of the converter natural adjustment of the ignition angle in the valve actuator with sudden enlargement and with Inverter operation is almost the same. Reduction of the input signal justified. This is equal. characteristic behavior of converters with 2. Arrangement according to claim 1, characterized by 2η natural commutation should refer to Fig. 1 _a indicates that the limiting value of the An and 1 b are explained in more detail.
The rate of increase of the limiter (7) so be Fi g. 1 a shows the function of the output measurement over time, with a sudden change in voltage of a three-phase converter with its natural input variable (Π) in the direction of equal commutation. Richterbetrieb the converter (S) the adjustment 25 It is assumed that the converter until development of the ignition angle in the direction of the rectifier point in time / 1 in rectifier operation with the operated a little slower than the natural angle \ 1 = 0 is controlled. At this time position of the ignition angle in the direction of alternating, the converter commutates from the phase voltage judge is. voltage i / 3 on the phase voltage Ul. Simultaneously 3. Arrangement according to claim 1, characterized in that the limiter (7) is formed with the ignition of the converter valves in such a way that the phase voltage 1 is the ignition angle that it only changes when its on-value \ 2 = Enlarged by 105 °. This adjustment gifted variable (Y 2) in the direction of rectifier operation has the effect that the following commutation from Ul to is effective. Ul not in the positive phase intersection at the time