CN113300583B - Automatic current-sharing step ratio control method for communication power supply module - Google Patents
Automatic current-sharing step ratio control method for communication power supply module Download PDFInfo
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- CN113300583B CN113300583B CN202110564319.7A CN202110564319A CN113300583B CN 113300583 B CN113300583 B CN 113300583B CN 202110564319 A CN202110564319 A CN 202110564319A CN 113300583 B CN113300583 B CN 113300583B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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Abstract
The invention discloses an automatic current-sharing step ratio control method for a communication power supply module, which comprises the following steps: acquiring actual voltage parameters through a voltage sampling circuit of each module, and adjusting output voltage of each module according to given voltage by acquiring respective bus voltage of each module; acquiring the total current of the system through a module external bus current sampling circuit, adjusting the current set value of each module in real time according to the module capacity and the total current, and controlling the parallel operation current-sharing value to be within +/-1%; the current-sharing value is adjusted through the module, whether the current-sharing value is correct or not is confirmed through communication calculation, calculation is carried out, the current-sharing value is output according to the given current-sharing value, and automatic current-sharing step ratio control of the communication power supply module is achieved. The method can improve the islanding effect of the power module in the system, improve the current impact under the condition of abnormal or sudden change of the load, realize the step ratio jump and reduce the use stress of the peripheral device.
Description
Technical Field
The invention relates to the technical field of communication power supply module control methods, in particular to an automatic current-sharing step ratio control method for a communication power supply module.
Background
At present, a communication power supply consists of a plurality of modules with the minimum power supply of 2000W, 3000W and 6000W, and the system capacity is expanded, namely the expansion of the power supply module. The current commonly used current sharing method comprises a current sharing method of a master-slave current sharing and external current sharing controller, an average current sharing method and a maximum current sharing method; a master-slave current sharing and an external current sharing device are commonly adopted; there are basically the following problems:
1. the requirement on the real-time performance of communication is high, a master-slave current sharing method and an external current sharing controller need to be communicated with each other, the system structure is complex, one of the master-slave current sharing method and the external current sharing controller needs to be selected as a host, and when the host has a problem, the work of the whole power supply system is directly influenced;
2. the requirement on the modules is high, and the rectifier modules are required to be selected in the same model as much as possible, so that the current equalizing effect can be controlled to be kept +/-5%;
3. the total capacity of the rectifier modules in the system must have enough redundancy to ensure that the current equalizing effect is poor, so that the overcurrent or overload of a single module causes system power failure;
4. the parallel operation current loop of the system is an inner loop, the voltage loop is an outer loop and is adjusted, the voltage control is taken as a target, the current sharing effect is achieved through consistent voltage output, when a certain module is abnormal, the load is suddenly changed, and the current sharing abnormality exceeds 5% due to the voltage fluctuation.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide an automatic current-sharing step ratio control method for a communication power supply module, which can improve the island effect of the power supply module in a system, improve the current impact under the condition of abnormal or sudden change of a load, realize step ratio jump and reduce the use stress of peripheral devices.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an automatic current-sharing step ratio control method for a communication power supply module is characterized by comprising the following steps:
acquiring actual voltage parameters through a voltage sampling circuit of each module, and adjusting output voltage of each module according to given voltage by acquiring respective bus voltage of each module;
acquiring the total current of the system through a module external bus current sampling circuit, adjusting the current set value of each module in real time according to the module capacity and the total current, and controlling the parallel operation current-sharing value to be within +/-1%;
the current-sharing value is adjusted through the module, whether the current-sharing value is correct or not is confirmed through communication calculation, calculation is carried out, the current-sharing value is output according to the given current-sharing value, and automatic current-sharing step ratio control of the communication power supply module is achieved.
The further technical scheme is that the method comprises the following steps:
output current adjustment value: before the system does not output, the load output current is 0, and the current is limited according to 50% at the moment; when the output current Iout is larger than 0, quickly adjusting to a calculation given value according to the input quantity of the work stations and the measured total current;
judging that the output current is within the range of +/-1% of a given value inside the module, wherein the given current is within a normal load range; when the actual current of the module is more than or equal to 1%, increasing a given value according to 1%; when the actual current of the module is less than or equal to-1%, reducing the given value by adopting two sections of proportional values; by the formula:
I refo ＝I ref +((p 2 -p 1 )/(e 2 -e 1 )*(e-e 1 )+p 1 ) E, increasing proportional amplitude limiting at the same time, and ensuring that the adjustment amount is within the range of 1%;
wherein: I.C. A ref To estimate a given value, I refo Given an output for reference, p 1 、p 2 As a fractional scaling factor, e 1 、e 2 Actual deviation values and subsection deviation values;
the system adjusts the actual output current: when all modules are in normal communication, each module obtains the capacity and the quantity of the parallel operation system, and calculates the current-sharing output given value of the module according to the total load current; calibrating the actual given current according to the current;
calculating the theoretical output current of the module according to the actual value
Iout is c1 x per + c2 y per + c3 z per, wherein c1, c2 and c3 represent module capacity values of 2000W, 3000W and 6000W, x, y and z represent the corresponding module capacity quantity, per represents the output proportion of the module; the control current value of each module is:
Iav 1 ＝(Iout-c2*y*per-c3*z*per)/(c1*x)
Iav 2 ＝(Iout-c1*x*per-c3*z*per)/(c2*y)
Iav 3 ＝(Iout-c1*x*per-c2*y*per)/(c3*z)
wherein: the variation of the per is less than or equal to +/-1%, and the latest per given value is calculated according to the output current Iout value and the input amount of x, y and z, so that the automatic current-equalizing step ratio control of the communication power supply module is realized.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1) by the method, the dependence on a host in a power supply system can be reduced, equipment such as a current sharing controller and the like can be reduced, and the equipment failure rate can be reduced; 2) the current dynamic active control is realized through a current-sharing step ratio control algorithm, and the system stability is improved; 3) the load dynamic adjustment is realized by current control, so that the parallel operation current of the modules is less than or equal to 1 percent; 4) the current step proportion control is realized, the current overshoot amplitude is reduced, and the stress of the device can be reduced.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a system of the overall system in an embodiment of the invention;
FIG. 3 is a block diagram of the control scheme of the power module in an embodiment of the invention;
fig. 4 is a flow chart of the method described in an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Example one
As shown in fig. 1, an embodiment of the present invention discloses an automatic current-sharing step ratio control method for a communication power supply module, including the following steps:
acquiring actual voltage parameters through a voltage sampling circuit of each module, and adjusting output voltage of each module according to given voltage by acquiring respective bus voltage of each module;
acquiring the total current of the system through a module external bus current sampling circuit, adjusting the current set value of each module in real time according to the module capacity and the total current, and controlling the parallel operation current-sharing value to be within +/-1%;
the current-sharing value is adjusted through the module, whether the current-sharing value is correct or not is confirmed through communication calculation, calculation is carried out, the current-sharing value is output according to the given current-sharing value, and automatic current-sharing step ratio control of the communication power supply module is achieved.
Example two
As shown in fig. 2, a topology structure diagram of a communication power supply system is shown, and a topology of the whole system is as follows: voltage and current PID regulation control technology comprising power supply modules from (c) to (c); firstly, a load current detection technology; ② CAN communication technology.
The power module is used for sampling the voltage U0 and the current I0 of the module, adding a path of system load output current Iout for detection, and simultaneously acquiring the capacity and the number of the modules through CAN communication detection. The system load current sampling adopts an independent voltage source signal, the circuit is connected in parallel to a power supply module, and the whole control block diagram is shown as a control block diagram in figure 3.
Aiming at the current sharing of a power supply system, the output proportion of each module is consistent, the current + voltage ring is firstly adjusted to be an inner ring, and then the outer ring of the current ring is controlled to be finally adjusted. The whole power supply module takes current regulation as a main regulation target. Aiming at the change of the electric load, a proportional step control algorithm is adopted, and the PID control algorithm is adjusted through a voltage inner ring and a current outer ring, so that the given current is dynamically adjusted to carry out discharge adjustment.
As shown in fig. 4, the method for controlling the automatic current-sharing step ratio of the communication power supply module includes the following steps:
output current adjustment value: before the system does not output, the load output current is 0, and the current is limited according to 50% at the moment; when the output current Iout is larger than 0, quickly adjusting to a calculation given value according to the input quantity of the work stations and the measured total current;
judging that the output current is within the range of +/-1% of a given value inside the module, wherein the given current is within a normal load range; when the actual current of the module is more than or equal to 1%, increasing a given value according to 1%; when the actual current of the module is less than or equal to-1%, reducing the given value by adopting two sections of proportional values; by the formula:
I refo ＝I ref +((p 2 -p 1 )/(e 2 -e 1 )*(e-e1)+p 1 ) E, increasing proportional amplitude limiting at the same time, and ensuring that the adjustment amount is within the range of 1%;
wherein: i is ref To estimate a given value, I refo Given an output for reference, p 1 、p 2 As a fractional scaling factor, e 1 E2 is the actual and piecewise offset values;
the system adjusts the actual output current: when all modules are in normal communication, each module obtains the capacity and the quantity of the parallel operation system, and calculates the current-sharing output given value of the module according to the total load current; calibrating the actual given current according to the current;
calculating the theoretical output current of the module according to the actual value
Iout is c1 x per + c2 y per + c3 z per, wherein c1, c2 and c3 represent module capacity values of 2000W, 3000W and 6000W, x, y and z represent the corresponding module capacity quantity, per represents the output proportion of the module; the control current value of each module is:
Iav 1 ＝(Iout-c2*y*per-c3*z*per)/(c1*x)
Iav 2 ＝(Iout-c1*x*per-c3*z*per)/(c2*y)
Iav 3 ＝(Iout-c1*x*per-c2*y*per)/(c3*z)
wherein: the variation of the per is less than or equal to +/-1%, and the latest per given value is calculated according to the output current Iout value and the input amount of x, y and z, so that the automatic current-sharing step ratio control of the communication power supply module is realized.
In the system parallel operation process, all the positive output power of the modules is mainly checked, and the overload of the modules caused by the negative effect due to uneven power distribution is avoided. The scheme innovatively adopts a discrete PID algorithm, aims at current control, and realizes independent control and adjustment of the modules by using current sampling data inside the modules and total load current data as accounting basis. The current-based control target is utilized to get rid of the influence of the potential difference of the correction module, so that the normal work of the module is not influenced when the system communication is abnormal, and the timeliness of the adjustment response of the module to the load change is improved.
The invention aims to improve the stability of a communication power supply system, improve the current sharing of a current system module to be less than or equal to 1 percent and realize the island effect of the power supply module in the communication power supply system, and the method has the following advantages that:
1) the dependence on a host in a power supply system is reduced, equipment such as a current sharing controller is reduced, and the equipment failure rate is reduced;
2) the current dynamic active control is realized through a current-sharing step ratio control algorithm, and the system stability is improved;
3) the load dynamic adjustment is realized by current control, and the parallel operation current of the modules is improved to be less than or equal to 1 percent;
4) the current step proportion control is realized, the current overshoot amplitude is reduced, and the stress of the device can be reduced.
Claims (1)
1. An automatic current-sharing step ratio control method for a communication power supply module is characterized by comprising the following steps:
acquiring actual voltage parameters through a voltage sampling circuit of each module, and adjusting output voltage of each module according to given voltage by acquiring respective bus voltage of each module;
the modules include, but are not limited to: 2000W, 3000W and 6000W of module capacity values;
acquiring the total current of the system through a module external bus current sampling circuit, adjusting the current set value of each module in real time according to the module capacity and the total current, and controlling the parallel operation current-sharing value to be within +/-1%;
the current-sharing value is adjusted through the module, then whether the current-sharing value is correct or not is confirmed through communication calculation, calculation is carried out, and the current-sharing value is output according to the given current-sharing value, so that automatic current-sharing step ratio control of the communication power supply module is realized;
output current adjustment value: before the system does not output, the load output current is 0, and the current is limited according to 50% at the moment; when the output current Iout is larger than 0, quickly adjusting to a calculation given value according to the input quantity of the work stations and the measured total current;
judging that the output current is within a range of +/-1% of a given value inside the module, wherein the given current is within a normal load range; when the actual current of the module is more than or equal to 1%, increasing a given value according to 1%; when the actual current of the module is less than or equal to-1%, reducing the given value by adopting two sections of proportional values; by the formula:
I refo ＝I ref +((p 2 -p 1 )/(e 2 -e 1 )*(e-e 1 )+p 1 ) E, increase simultaneouslyAdding proportional amplitude limiting to ensure that the adjustment amount is within 1 percent;
wherein: i is ref To estimate a given value, I refo Given an output, p, for reference 1 、p 2 As a segment scale factor, e 1 、e 2 Actual deviation values and piecewise deviation values;
the system adjusts the actual output current: when all modules are in normal communication, each module obtains the capacity and the quantity of the parallel operation system, and calculates the current-sharing output given value of the module according to the total load current; calibrating the actual given current according to the current;
calculating the theoretical output current Iout of the module, namely c1 x per + c2 y per + c3 z per according to the actual value, wherein c1, c2 and c3 represent the capacity values of 2000W, 3000W and 6000W modules, x, y and z represent the capacity quantity of the corresponding modules, and per represents the output proportion of the modules; the control current value of each module is:
Iav 1 ＝(Iout-c2*y*per-c3*z*per)/(c1*x)
Iav 2 ＝(Iout-c1*x*per-c3*z*per)/(c2*y)
Iav 3 ＝(Iout-c1*x*per-c2*y*per)/(c3*z)
wherein: the variation of the per is less than or equal to +/-1%, and the latest per given value is calculated according to the output current Iout value and the input amount of x, y and z, so that the automatic current-sharing step ratio control of the communication power supply module is realized.
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| CN101154818A (en) * | 2006-09-27 | 2008-04-02 | 力博特公司 | Method and system for parallel connection of UPS derated models with different capacitance grade |
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| CN104935156B (en) * | 2015-06-26 | 2016-03-30 | 长沙广义变流技术有限公司 | A kind of dynamic current equalizing control method and circuit |
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| US10153710B1 (en) * | 2017-07-25 | 2018-12-11 | Delta Electronics, Inc. | Power supply and control method thereof |
| CN111049123B (en) * | 2020-03-18 | 2020-06-16 | 深圳市永联科技股份有限公司 | Autonomous current-sharing control method for parallel connection of a large number of direct-current voltage source power modules |
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