HU185719B - Circuit arrangement for controlling the parallel operation of parallel connected controlled current converters with subordinate and surmount regulators using the limitation of surmount regulator - Google Patents

Circuit arrangement for controlling the parallel operation of parallel connected controlled current converters with subordinate and surmount regulators using the limitation of surmount regulator Download PDF

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Publication number
HU185719B
HU185719B HU185082A HU185082A HU185719B HU 185719 B HU185719 B HU 185719B HU 185082 A HU185082 A HU 185082A HU 185082 A HU185082 A HU 185082A HU 185719 B HU185719 B HU 185719B
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HU
Hungary
Prior art keywords
parallel
circuit
current
controller
output
Prior art date
Application number
HU185082A
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Hungarian (hu)
Inventor
Ferenc Kleinheincz
Matyas Fenyvesi
Gyoergyne Lelovics
Sandor Palfi
Original Assignee
Villamos Berendezes Es Elektro
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Villamos Berendezes Es Elektro filed Critical Villamos Berendezes Es Elektro
Priority to HU185082A priority Critical patent/HU185719B/en
Publication of HU185719B publication Critical patent/HU185719B/en

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Abstract

The circuit arrangement according to the invention implements a continuous transition of power converters in a continuous, energy-saving, galvanically independent parallel operation. The switching arrangement is designed to control the parallel operation of the controlled directors connected in parallel to the common manifold system, using at least one of the limiting and subordinate controllers of at least one of the parallel-connected current converters. The shunt-limiting circuit or the feedback boundary circuit and the reference point associated with the output of the master controller output of these controllers subordinate to the reference input of the controller to be used to limit the output of the parent controller, or the boundary circuit of the parent controller, or the said output of the parent controller, the input of a parent control amplifier element is provided with a boundary detection circuit, the at least one output of which is connected directly or directly to a suitable input of the control and control circuit of at least one other transducer connected in parallel with the current transformer. The switching arrangement according to the invention can be used very advantageously in all applications where high load fluctuations, expansion possibilities, redundant feeding or other reasons require parallel operation of the current controllers. -1-

Description

The circuit arrangement of the present invention provides a continuously transient, energy-saving, current-limiting, galvanically independent parallel operation.
The circuit arrangement is configured to control the parallel operation of controlled current controllers connected in parallel to a common busbar system, utilizing a boundary of at least two-loop, subordinate and subordinate controllers in at least one of the parallel switched current controllers. A shunt limiting circuit or feedback point circuit and a feedback limiting circuit, respectively, for controlling the output of a slave limiter or feedback limiting circuit for supplying a setpoint input to a slave controller for said current controllers, or said slave output of said slave slave a limiting sensing circuit having at least one output connected to a suitable input of the control and regulating circuit of at least one of the current controllers connected in parallel with the current controller.
The switching arrangement according to the invention can be used very advantageously in all applications where high load fluctuation, expansion potential, redundant power supply or other reasons require parallel operation of the current controllers.
185,719
bail
BACKGROUND OF THE INVENTION The present invention relates to a circuit arrangement for controlling the parallel operation of controlled current controllers on a common busbar system, utilizing the limiter of a controller of a control unit having subordinates and subordinates,
The switching arrangement according to the invention has two outlets connected to one or more units connected in parallel to one or more units with a higher-regulator - in practice a high-voltage regulator and a sub-regulator - in most cases a subordinate current regulator. using the limiter of a higher voltage regulator in at least one of them. With the circuit arrangement of the present invention, it is possible to cause the current control device controlling the parallel operation to cause another current control device to receive the increasing load current when the current is limited by the current limiting current limitation of the voltage regulator,
The circuit arrangement according to the invention is advantageously applicable in all applications where load-dependent parallel operation of current control devices is required. Such applications include, for example, switching power supply with uninterruptible power supplies or other similar operation where, for example, parallel operation of rectifying devices is required2, and the output parameters are often controlled by implementing an IU characteristic.
The parallel operation of current controllers with two loops, with upstream and downstream controllers, in which the output voltage and current control is generally implemented in an IU characteristic, can be accomplished in various ways.
In one such well-known solution, the voltage regulator of one of the parallel-connected current controllers, acting as a master controller, provides the current reference of the slave current regulator of all parallel-connected current controllers. The disadvantage of this solution is that the control is implemented in the same way throughout the operating range, so that all parallel-connected current controllers, while taking on the same load current, are far below optimum efficiency and net load power (eg rectifiers). can last for a long time.
Another known solution to overcome the above disadvantage is to use IU curves with or without any further action (as in Techn. Mitteilungen AEG. TELEFUNKEN 67, pp. 47-58, 1977).
K. Leifeld - H. Offergeld: Gesicherte Gleichstromversorgung, Projektierung und Ausführung), or by adjusting their voltage setpoints relative to one another, not exceeding the requirement of static control accuracy, are connected in parallel, thereby ensuring that: under the load of a single current control unit, the current control unit whose voltage reference, including its output voltage, is higher than that of the others, and when the load of the single current control unit, the current control unit of higher voltage, determined by a parallel voltage control unit with a lower voltage basis. The disadvantage of this solution is that when it is desired to determine which current controller controls the process of parallel control, the voltage reference signals must be set relative to one another, thereby reducing the static control accuracy of the output voltage. This may already be critical with a large number of parallel current controllers. In the event that the setpoints are not set apart, but relying on the small difference that is necessarily present between the voltage setpoints, the parallel operation is irregular, since it is not known which setpoint is actually set to what value.
In order to achieve parallel operation in a systematic manner, another known solution is to step-wise the other rectifiers, depending on the current load of the parallel operating current controller, to operate only at current load or at the partial load point of the rated load. Such a solution is presented in the Ericsson Review 1968.4. 1748 special imprint-2185 719 ta 2 - 22 A. Ljungblom: LM Ericsson Stromversorgungssysteme für Fernmeldeanlagen c. Article. The disadvantage of this solution is that the connection of the other current controllers connected to the parallel operation current controller can be time consuming, since the switching commands take considerable time, so we have to consider significant dynamic transients. A further disadvantage is that in a given load, both the parallel current controller and a parallel current controller may generate much less current than the rated load, which may result in a reduction in efficiency, an increase in wasteful energy,
In order to overcome the above disadvantages, a solution known from the Hungarian patent application 1843/82, "Circuit arrangement with continuous operation rectifiers for transient load-free, energy-saving, preferably telephone switching power supply", is known, which provides a continuous connect the following current controller to the common output line system before reaching the rated load point or the rated load point or the rated load point or current limit point or current limit of the current-controlling parallel operation of the arbitrary parallel operation; as soon as the parallel-connected current was drawn, the vis Saw the original parallel operating current controller by pulling its voltage reference signal firmly within the current limit so long as it only draws the current applied to the second current, thereby ensuring that the voltage of the second current controller now controls the output voltage. Continuous Transition, in this way, transfers the voltage control function of the first powered current controller (parallel operating current controller) to a second current controller at a predetermined point, or, in the case of more than two parallel connected current controllers, the current operating parallel controller. followed by a current controller.
The implementation of a continuous transient parallel operation has the difficulty of providing a timing stable and accurate implementation of the actuator signal that initiates this transition between the two current controllers. However, it is a further problem that, if the current limitation should be adjustable in the parallel operation current controller (which is not the case in most cases), the parallel power controller would also set the parallel operating command when generating the current limitation. must be stopped.
In an effort to overcome the above problems, a circuit arrangement has been developed in which the parallel operation of any number of current controllers with a controlled output parameter having a slave current controller can be accomplished such that the signal for starting the parallel operation is controlled by the parallel operation. where the controller current controller has just reached a current limitation, ie it is no longer able to cover the full load. Recognizing that the circuit arrangement of the present invention best solves this problem, the onset of the current limitation by the limiting effect of the overcurrent regulator, in this case the voltage regulator, in the current controller controlling the parallel operation, is formed by the and a signal connected to the control and control circuit of the other current controller connected to its control circuit which is capable of starting the parallel operation of the parallel current controller.
The circuit arrangement of the present invention is for controlling the parallel operation of a controlled current controller in parallel, wherein at least one of the parallel current controllers in a common manifold system comprises at least a two-loop controller having subordinate and subordinate controllers; a shunt limiting circuit or feedback limiting circuit and reference point for controlling the slave limiting circuit or feedback limiting circuit providing the slave control output providing the slave reference signal input, or the slave limiting circuit and feedback point, respectively, to said slave output of the slave a subrack sensor between the input of the higher controller amplifier element a circuit having at least one output directly or through a suitable signal forming element connected to a suitable input of a control and regulating circuit of at least another current controller connected in parallel with the current controller.
The circuit arrangement according to the invention described above may also be configured such that the boundary sensing circuit comprises an optocoupler having a light emitting element coupled between the parent regulator output and the shunt limiting circuit or the feedback shunt circuit or the shunt limiting circuit connected to the parent regulator output. between the feedback limiting circuit and the reference point and the input of the parent control amplifier, the light sensor element being directly or indirectly coupled to an output of the limiting sensor circuit directly or indirectly coupled to at least one other current control controller and is connected to a suitable input of the control circuit.
In the case of individual delivery of parallel current controllers, eg. Due to the increase in power demand, a previously operating current controller with another parallel connected current controller!
In the expansion of 185,719, any of the above-described switching arrangements is implemented when a control unit with at least two loops of subordinate and subordinate controllers is connected to one another in a control unit having at least two loops of subordinate and subordinate controllers; an output which has properties, which can be connected in parallel with the current controller and can be connected to a suitable input of the control and regulation circuit of another current controller either directly or by means of a suitable signal forming element. ___________________
The structure and operation of the circuit arrangement according to the invention will be described with reference to the drawings.
Fig. 1 shows two current controllers out of the principle of any number of current controllers connected to a manifold, wherein the current controller 11 is illustrated in the circuit arrangement of the present invention, so that in the example of this figure, the current controller can be considered a parallel controller.
FIG. 2 illustrates an embodiment of a circuit arrangement according to the present invention wherein a boundary sensing circuit is inserted between the output of a subordinate controller providing a reference signal to a subordinate controller and a shunt limiting circuit.
Fig. 3 illustrates an embodiment of a circuit arrangement according to the invention in which a boundary sensing circuit is inserted between the output of a subordinate controller and a feedback limiting circuit of a subordinate controller.
Fig. 4 illustrates an embodiment of a boundary sensing circuit according to the invention with an optocoupler.
Figure 1 will now be described. Each of the current controllers 11 and 12 has inputs 111 and 121 for connecting the power (mains) to be converted, main circuits 112 and 122 for converting the electricity to the desired parameter, outputs 113 and 123 connected to a common grid system 13. transformed electricity is displayed, as well as control and regulation circuits 114 and 124 which perform various control and regulation functions necessary for converting energy in connection with the main circuits 112 and 122.
In the circuit arrangement according to the invention, at least one output A of the control and control circuit 114 is connected to an input B of the control and control circuit 124. Not necessarily from the circuit arrangement of the present invention, but an output C of the control circuit 124 may be connected to an input D of the control circuit 114. In the circuit arrangement according to the invention, the control and control circuits 114 and 124 each have a dual-loop higher voltage regulator and a slave current regulator providing an IU characteristic output control, while the control and regulating circuit provides a signal to a suitable input B of the control circuit 124 of the parallel-connected current controller 12, which ensures that when the current controller 11 enters a current limitation, the control and regulation circuit 124 of the current controller 12 provides output voltage by controlling the current 122; thereby allowing the current controller 12 to draw a load current. Of course, to ensure that parallel operation is maintained in this way, the output voltage of the current controller 12 determines the output voltage of the collecting system 13. This condition can be achieved in two ways without affecting the essence of the circuit arrangement of the invention: either by adjusting the voltage reference of the two current controllers 11, 12 so that the reference signal of the current controller 12 is slightly lower than that of the current controller 11; providing a control signal from the output C of the circuit to the input D of the control and control circuit 114 such that at the same time as the load current appearing on the current controller 12, the signal from the input C in the control circuit be.
In the circuit arrangement according to the invention, the parallel operation control signal A of the parallel operation controller 11 is generated by sensing the limit of the higher controller. Figures 2 and 3 show parts of the control and control circuit 114 that affect the essence of the circuitry of the present invention.
The known two loop control circuit is formed in accordance with Figures 2 and 3 that the controller 21 parent with feedback according to the control characteristics impedance amplifying element - is connected 211 to the input of the output voltage prescriptive X sub setpoint, while 212 input is connected to the - usually fészülíségszabályozó an output signal X el corresponding to the output voltage, but its output 213 is connected to the input of reference signal 221 of the slave controller 22, usually a current controller. The input 222 of the slave controller 22 is connected to the control signal X e2 corresponding to the output current, and the output 223 of the control signal.
In FIG. 2, a shunt limiting circuit 23 is coupled between an output 213 and a reference point 25 by applying a limit detection circuit 26. In FIG. 3, feedback loop 24 is coupled between input 215 of input 215 of the parent regulator 21 and output 213 of the limit detection circuit 26, In both figures, output A of the limit detection circuit 26 is the same as output A of the control and control circuit 114 of FIG.
Of course, the switching arrangement according to the invention does not substantially change the switching of the shunt detection circuit 23 and the limit detection circuit 26, or the feedback circuit 24 and the restriction detection circuit 26, i.e. directly to the output 213 of the shunt control circuit 23 or 24. a feedback limiting circuit is connected and the limiting sensor circuit 26 is a reference point 25 and a shunt limiting current 23
It is interposed between 185 719 circuits or between input 215 and feedback limiting circuit 24.
In Figures 2 and 3, output 213 provides a setpoint X a2 at the input of reference signal 221 of the slave controller 22, most often a current controller.
In the circuit arrangement according to the invention, the shunt limiting circuit 23 or the feedback limiting circuit 24 connected to the output 213 or shunt-like, which creates a current limiting X a2 limitation, i.e. a current limitation, is shown in FIGS. It is connected via a boundary sensing circuit. Output A of output of the boundary sensing circuit 26 is provided either directly or via an arbitrary transducer to the control and control circuit 124 when the boundary is triggered from output 213 to reference point 25 or by input of amplifier element 214 of the higher level controller 21. At its 215 inputs I k current flows.
It is a variation and example of a circuit implementation of the boundary sensing circuit 26, wherein the boundary sensing in the boundary sensing circuit 26 is solved using an optocoupler.
The use of the optocoupler in accordance with the present invention is illustrated in Figure 4 of its shunt limiting example. 4, the boundary sensing circuit 26 associated with output 213 comprises an optocoupler 261 having a light emitting element 2611 connected between the output 213 and a shunt limiting circuit 23, and a light sensing element 2612 connected directly to the output A via appropriate signal shaping.
When the limiting current starts between output 213 and reference points 25, the light emitting element 2611 generates, directly or indirectly, a control signal at its output A through the light sensing element 2612.
Of course, the use of an optical coupler as described above in the limit detection circuit 26 is possible in any of the circuitry arrangements of the present invention.
The circuit arrangement according to the invention thus has the following advantageous properties:
- enables continuous parallel operation of the current controllers, where the current controllers are connected to the parallel operating current controller without transient so that the parallel operating current controller after the establishment of the parallel operation, preferably operating at the current load limit often at its rated load point; remain optimum operating point for infertile performance;
- Enables the parallel operation current controller to issue a parallel operation command to the parallel current controller only when it has entered a power limitation, so that no separate control unit is required to set the control command even if the current limitation point is adjustable it must be, since the control command is necessarily related to the current limiting generator circuit process itself;
- enables the parallel operation of any number of current controllers in the control circuit so that, depending on the load current, the current element of the chain takes over the role of the parallel controller controlling the parallel operation and passes the latter to the parallel operation;
- enables, by means of an optocoupler, that the current limiter circuit of the parallel mode controller is galvanically independent of the parallel mode control signal, i.e., the control and control circuit of the parallel connected current controller, thereby providing a full galvanic is intended to eliminate any interference which may result from a attachment.

Claims (2)

  1. Patent claims
    A circuit arrangement for controlling the parallel operation of a parallel-operated controlled current controller having at least one of two common-loop controllers having at least two loops, downstream and downstream controllers, in a common busbar system, wherein the downstream controller of said control unit is defined by (11) a shunt limiting circuit (23) and a feedback limiting circuit (24) for controlling the output (213) of the slave controller (22) providing the setpoint input (221) of the slave controller (22) and the slave controller (21) respectively. output (213). or an input (215) of a shunt limiting circuit (23) or a feedback limiting circuit (24) and a reference point (25) connected to said output (213) of the slave controller (21) or the amplifier (214) of the slave controller (21). ), there is provided a boundary sensing circuit (26) having at least one output (A) directly or through a suitable signal forming element to a suitable input (124) of the control and regulating circuit (124) of at least one other current controller (12) B) connected.
  2. Circuit arrangement according to claim 1, characterized in that the boundary sensing circuit (261) comprises an optocoupler (261) having a light emitting element (2611) coupled to the output (213) of the parent controller (21) and the shunt limiter (213). a shunt limiting circuit (23) connected to a feedback circuit (23) or to a feedback limiting circuit (24) or to an output (213) of the higher controller (21) and a reference point (25) or higher between the amplifier element (214) of the regulator (21) and the light sensor element (2612) directly or indirectly connected to the outermost sensor circuit (26).
    185,719 turns (A) connected directly or via a suitable signal forming element to a suitable input (B) of the control and regulation circuit (124) of at least one other current controller (12) connected in parallel with the current controller (11).
HU185082A 1982-06-09 1982-06-09 Circuit arrangement for controlling the parallel operation of parallel connected controlled current converters with subordinate and surmount regulators using the limitation of surmount regulator HU185719B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
HU185082A HU185719B (en) 1982-06-09 1982-06-09 Circuit arrangement for controlling the parallel operation of parallel connected controlled current converters with subordinate and surmount regulators using the limitation of surmount regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU185082A HU185719B (en) 1982-06-09 1982-06-09 Circuit arrangement for controlling the parallel operation of parallel connected controlled current converters with subordinate and surmount regulators using the limitation of surmount regulator

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HU185719B true HU185719B (en) 1985-03-28

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HU185082A HU185719B (en) 1982-06-09 1982-06-09 Circuit arrangement for controlling the parallel operation of parallel connected controlled current converters with subordinate and surmount regulators using the limitation of surmount regulator

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HU90 Patent valid on 900628
HMM4 Cancellation of final prot. due to non-payment of fee