CN115800748A - Constant-current output power supply and control method - Google Patents
Constant-current output power supply and control method Download PDFInfo
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- CN115800748A CN115800748A CN202111062676.XA CN202111062676A CN115800748A CN 115800748 A CN115800748 A CN 115800748A CN 202111062676 A CN202111062676 A CN 202111062676A CN 115800748 A CN115800748 A CN 115800748A
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Abstract
The invention discloses a constant current output power supply and a control method thereof. The constant-current output power supply can automatically realize voltage equalization when being connected in series, does not need voltage equalization line connection, is suitable for a remote series system, and is convenient and reliable.
Description
Technical Field
The present invention relates to the field of power conversion technology, and more particularly to a power supply in a remote multi-node constant current power supply system.
Background
The power supply types of submarine fiber optic cable networks are classified into constant voltage and constant current types. The constant voltage power supply network is a parallel network and has the characteristics of strong expansibility, high conversion efficiency and the like, but for sea areas with high fishery damage risk or complex geology, once an insulating layer of a submarine cable is damaged or a main seabed base station is in short circuit fault, the power supply breakdown of the whole system is caused. The constant-current power supply network is a series network and has the characteristics of strong short-circuit fault resistance, simple fault location, high reliability, good robustness and the like.
Aiming at a constant-current series system, the output of a plurality of modules is used in series, and the problem of voltage sharing among the modules exists, so that high-voltage output is achieved, and the reliability of the system is improved.
Patent document "constant current module series output voltage-sharing control circuit and parameter determination method" publication No. CN109936286A discloses a maximum voltage implementation, referring to fig. 3 thereof, each module has a voltage ring and a current ring, and simultaneously each module samples output voltage and constitutes a voltage-sharing ring, the voltage-sharing bus is the maximum value of the output voltage in all the modules, and the output of the voltage-sharing ring adjusts the setting of the current ring. The purpose of voltage sharing is achieved by enabling each module to track the maximum output voltage.
The first prior art has the following defects:
1) The voltage-sharing bus is not suitable for a remote power supply system, and when equipment at two ends are too far away, the voltage-sharing buses cannot be interconnected.
2) And voltage-sharing buses are needed among the modules for communication, so that the reliability is reduced.
Disclosure of Invention
The invention provides the constant-current output power supply, controls the output resistance of the constant-current output power supply through software programming, realizes automatic voltage equalization when a plurality of constant-current output power supplies are connected in series, and improves the reliability of the system.
The constant-current output power supply comprises a converter, wherein the output end of the converter is connected with a resistor in parallel, and the impedance of the resistor is smaller than the equivalent output impedance of the converter.
The constant-current output power supply further comprises a regulator, wherein the regulator samples the output voltage and the output current of the converter, subtracts the output voltage and the output current from the output current reference value, and then generates a driving signal of a switching device in the converter after regulation.
The resistor is generated by multiplying the output voltage by a coefficient, and subtracting the output voltage from the output current reference value, wherein the coefficient is the reciprocal of the impedance of the resistor.
The regulator regulates the output current reference value, and regulates the current reference value when the output voltage changes.
The invention also provides a control method of the constant current output power supply, which comprises the following steps that S1, a resistor is connected in parallel at the output end of the power supply, and the impedance of the resistor is smaller than the equivalent internal resistance of the power supply; and S2, adjusting the reference value of the output current of the power supply, and further adjusting the output voltage of the power supply.
The step S1 includes detecting an output voltage and an output current at the output terminal of the power supply, subtracting the output current after the product of the output voltage and a coefficient from the output current to obtain an error signal, and adjusting the error signal to generate a driving signal of a switching device in the power supply.
The invention also provides a submarine optical cable high-voltage direct-current power supply network which comprises a plurality of constant-current output power supplies, wherein the output ends of the constant-current output power supplies are connected in series, and the input ends of the constant-current output power supplies respectively receive input electricity.
The invention also provides a constant current output system which comprises a plurality of the constant current output power supplies, wherein the output ends of the constant current output power supplies are connected in series, and the input ends of the constant current output power supplies are connected in parallel.
The invention also provides a submarine optical cable high-voltage direct-current power supply network which comprises a plurality of constant-current output systems, wherein the output ends of the constant-current output systems are connected in series, and the input ends of the constant-current output systems respectively receive input electricity.
The technical scheme of the invention realizes series voltage-sharing control between power supplies during long-distance power supply transmission, does not need a communication line and automatically carries out voltage sharing.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a block diagram of a submarine optical cable high-voltage direct-current power supply network.
Fig. 2 is an equivalent circuit diagram of the shore-based power supply of the present invention.
Fig. 3 is a block diagram of a first embodiment of a topology of a shore-based power supply of the present invention.
Fig. 4 is a block diagram of a second embodiment of the topology of the shore-based power supply of the present invention.
Fig. 5 is a block diagram of a first embodiment of a series connection system of two shore-based power sources.
Fig. 6 is a block diagram of a second embodiment of a series connection system of two shore-based power sources.
Fig. 7 is a block diagram of the topology of the power module of fig. 6.
Fig. 8 shows an embodiment of the converter of the present invention.
FIG. 9 is a flow chart of a power control method according to the present invention.
Fig. 10 is a specific implementation manner of step S1 in fig. 9.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1, the submarine optical cable high-voltage direct-current power supply network comprises a constant-current output system 1, a submarine cable 3, a submarine power supply 2 and a load 4, wherein the constant-current output system 1 supplies power to the submarine power supply 2 through the submarine cable 3, and the submarine power supply 2 provides power drive according to the requirement of the load 4. The submarine optical cable high-voltage direct-current power supply network comprises a plurality of constant-current output systems 1, such as a constant-current output system 1A and a constant-current output system 1B which are arranged on two remote islands, wherein the constant-current output systems 1A, a submarine power supply 2 and the constant-current output systems 1B are connected in series. The constant current output system 1A and the constant current output system 1B are physically far apart, but because they are connected in series, voltage-sharing control still needs to be realized.
As shown in fig. 2, which is an equivalent circuit diagram of the constant current output system 1 of the present invention, the constant current output system 1 includes a constant current output power supply, ro is an internal resistance of the constant current output system 1, an output current of the constant current output power supply is Io, and an output current reference value is Iref. Referring to fig. 3 again, the constant current output power supply designed by the present invention includes an inverter 101 and a regulator 102, where the regulator 102 samples an output voltage Vo and an output current Io of the inverter and obtains a control error Ierror after subtracting an output current reference value Iref from the output voltage Vo and the output current Io, and the regulator 102 generates a duty ratio or a frequency of a driving signal for adjusting a switching device in the inverter 101 according to the control error Ierror.
Referring to fig. 2 again, as for the regulator 102 shown in fig. 3, the output voltage Vo is multiplied by the coefficient K =1/Rv and then is subtracted from the output current reference value Iref, thereby generating the equivalent resistor Rv shown in fig. 2, the resistance of the equivalent resistor Rv is much smaller than the equivalent internal resistance Ro of the bank-based power supply 1, so that the output impedance of the bank-based power supply 1 is approximately equal to the equivalent resistor Rv.
As shown in fig. 4, the constant current output system 1 includes at least two constant current output power supplies, the constant current output power supply 11 and the constant current output power supply 12 are connected in series, the constant current output power supply 11 and the constant current output power supply 12 respectively adopt a topology block diagram as shown in fig. 3, taking the constant current output power supply 11 as an example, the regulator 102 samples an output voltage Vo1 of the constant current output power supply 11 and an output current Io of the constant current output power supply 11, and adjusts the output voltage Vo and the output current Io after comparing with an output current reference value Iref1, the adjusting method includes proportional integral adjustment and the like, PWM signals are generated through adjustment, and then the PWM signals are converted into driving signals for driving a switching device in the converter 101.
The output voltage Vo1 is multiplied by a coefficient K =1/Rv and then is subtracted from the output current reference value Iref, that is, an equivalent resistor Rv shown in fig. 3 is connected in parallel to the output end of the constant current output power supply, and the resistance value of the equivalent resistor Rv is much smaller than the equivalent internal resistance Ro of the constant current output power supply 11, so that the output impedance of the constant current output power supply 11 is approximately equal to the equivalent resistor Rv. The output impedances of the constant-current output power supplies are equal, and voltage sharing is realized under the condition that the output ends of the constant-current output power supplies are connected in series.
As shown in fig. 5, the two constant current output systems 1A and 1B are geographically far away, and the constant current output system 1A and the constant current output system 1B respectively adopt the topology block diagrams shown in fig. 3. The output impedance of the constant current output system 1A is approximately RvA, and the output impedance of the constant current output system 1B is approximately RvB, so that RvA = RvB, and the output voltages Vo1 and Vo2 are approximately equal to achieve the purpose of voltage sharing. The voltage-sharing control during the long-distance transmission is realized, the communication is not needed, and the voltage sharing is automatic.
As shown in fig. 6, the constant current output system 1A includes a plurality of constant current output power supplies, the constant current output system 1B also includes a plurality of constant current output power supplies, each of the constant current output power supplies has a topology as shown in fig. 7, and the sampled output voltage Vo and the output current Io are respectively compared with the output current reference value Iref, and then are subjected to regulation control, and output a switching drive signal of a switching device in the converter 101. The output voltage Vo1 is multiplied by a coefficient K =1/Rv and then is subtracted from an output current reference value Iref, that is, an equivalent resistor Rv is connected in parallel to the output end of the constant current output power supply, and the resistance value of the equivalent resistor Rv is far smaller than the equivalent internal resistance Ro of the constant current output power supply, so that the constant current output power supply in each constant current output system realizes voltage sharing after being connected in series, in addition, the output impedances of the constant current output system 1A and the constant current output system 1B are equal, the output impedances of the constant current output system 1A and the constant current output system 1B, such as Rv a = N × Rv and Rv B = N × Rv, realize voltage sharing after the constant current output system 1A and the constant current output system 1B are connected in series.
Fig. 8 shows an embodiment of the converter 101 of the present invention, which includes a full-bridge inverter unit formed by switches S1 to S4 and an isolation transmission unit formed by a plurality of transformers T1 to Tn, wherein primary sides of the transformers T1 to Tn are respectively connected in parallel with output ends of the full-bridge inverter unit, and secondary sides of the transformers T1 to Tn are respectively connected in parallel with a rectifier unit and then connected in series to output voltage Vo.
The regulator 102 samples the current Io and the voltage Vo at the output terminal of the converter 101, compares the current Io and the voltage Vo with an output current reference value Iref, and then regulates the duty ratios of the switches S1 to S4 by regulating the driving signals of the output control switches S1 to S4, thereby regulating the output current Io.
As shown in fig. 9, the method for controlling a constant current output power supply according to the present invention includes a step S1 of connecting a resistor in parallel to an output terminal of the power supply, where impedance of the resistor is much smaller than equivalent internal resistance of the power supply, so that output impedance of the power supply is equal to impedance of the resistor and the equivalent internal resistance after the resistor and the equivalent internal resistance are connected in parallel, and is approximate to impedance of the resistor.
And S2, adjusting the reference value of the power supply output current, and further adjusting the output voltage of the power supply.
The step S1 comprises the steps of detecting output voltage and output current of the power supply output end, subtracting the output current after the product of the output voltage and a coefficient k from the output current reference value to obtain an error signal, and adjusting the error signal to generate a driving signal of a switching device in the power supply.
The coefficient k is the inverse of the resistance of the resistor, also because this creates a parallel resistance at the power supply output.
In connection with fig. 3, the following relationship is satisfied between the output voltage, the output current and the output current reference value:
thus, the number of the first and second electrodes,
Vo＝(Iref-Io)*Rv
according to the relation, when the output voltage of the power supply changes, the reference value Iref of the output current can be further adjusted, so that the output voltage is kept stable, and the purpose of accurate voltage sharing is achieved.
The control method can realize voltage sharing among shore-based power supplies connected in series at a long distance, is simple and easy to control, and does not need voltage-sharing lines.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. The constant-current output power supply is characterized by comprising a converter, wherein the output end of the converter is connected with a resistor in parallel, and the impedance of the resistor is smaller than the equivalent internal resistance of the converter.
2. The constant current output power supply according to claim 1, further comprising a regulator, wherein the regulator samples an output voltage and an output current of the converter, subtracts the output voltage and the output current from an output current reference value, and then regulates to generate a driving signal for a switching device in the converter.
3. The constant current output power supply according to claim 2, wherein said resistor is generated by multiplying said output voltage by a coefficient which is an inverse of an impedance of said resistor and subtracting said output current reference value from said output voltage.
4. A constant current output power supply as claimed in claim 3, wherein said regulator regulates said output current reference value, and regulates said current reference value when said output voltage varies.
5. The constant-current output power supply control method is characterized by comprising the following steps of S1, connecting a resistor in parallel at the output end of a power supply, wherein the impedance of the resistor is smaller than the equivalent internal resistance of the power supply; and S2, adjusting the reference value of the power supply output current, and further adjusting the output voltage of the power supply.
6. The method for controlling a constant current output power supply according to claim 5, wherein the step S1 comprises detecting an output voltage and an output current of the output terminal of the power supply, subtracting the output current after the product of the output voltage and a coefficient from an output current reference value to obtain an error signal, and adjusting the error signal to generate a driving signal of a switching device in the power supply.
7. Submarine optical cable high-voltage direct-current power supply network, comprising a plurality of constant-current output power supplies according to claims 1-4, wherein the output ends of the constant-current output power supplies are connected in series, and the input ends of the constant-current output power supplies respectively receive input electricity.
8. A constant current output system comprising a plurality of constant current output power supplies according to claims 1 to 4, the output terminals of the constant current output power supplies being connected in series, and the input terminals of the constant current output power supplies being connected in parallel.
9. A submarine optical cable high-voltage direct-current power supply network comprising a plurality of constant-current output systems according to claim 8, wherein the output ends of the constant-current output systems are connected in series, and the input ends of the constant-current output systems respectively receive input electricity.
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| CN202111062676.XA CN115800748A (en) | 2021-09-10 | 2021-09-10 | Constant-current output power supply and control method |
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