KR20230052115A - Method for maximum efficiency operation of a unit module using load estimation and power supplying device with maximum efficiency for the same - Google Patents

Abstract

The present invention relates to a method for operating a plurality of modules connected parallel to a load to supply power to the load, wherein the method comprises the steps of: determining, by an integrated controller, which controls a first module among the plurality of modules, a rated power value of the load; calculating, by the integrated controller, the number of maximum efficiency operation modules, which need to be operated in a maximum efficiency mode, and the number of normal operation modules, which need to be operated in a normal operation mode, among the plurality of modules in order to supply power to the load by using the determined rated power value; selecting, by the integrated controller, as many modules as the calculated number of maximum efficiency operation modules and the calculated number of normal operation modules among the plurality of modules; transmitting, by the integrated controller, operation mode information and an operation command to slave controllers, which respectively control the selected modules; and controlling, by the integrated controller and the slave controllers, operations of respective corresponding modules by using the operation mode information transmitted thereto. According to the present invention, the maximum power point of a load of which the rating is unknown can be determined in a short time.

Description

Method for maximum efficiency operation of a unit module using load estimation and power supplying device with maximum efficiency for the same}

The present invention relates to a method for efficiently operating a power supply device having unit modules that does not require a higher level controller and a technology related to a maximum efficiency power supply device therefor.

Various algorithms for parallel operation of power supplies have been published. One of them is a master-slave control algorithm for parallel operation of a modular 3-phase uninterruptible power supply. An uninterruptible power supply (UPS) is a preparation for power failure, and researches on solving problems of circulating current and power imbalance between modules in parallel operation of UPS modules have been published.

Korean Patent Registration (10-1771396) discloses a technology for a method and apparatus for controlling efficiency leveling and controlling output voltage of a parallel modular power conversion unit. According to the registered patent, it includes a plurality of power conversion units connected in parallel to supply power to a load, the power supply amount of each power conversion unit is determined based on a preset efficiency value, and each power conversion unit has different rated ratings. have capacity

An object of the present invention is to provide a method for operating a power supply with maximum efficiency using a plurality of modules without a separate external controller exchanging commands with a higher level controller.

According to one aspect of the present invention, it is possible to provide a single module maximum efficiency driving method of operating a plurality of modules connected in parallel to a load to supply power to the load. The single module maximum efficiency driving method may include determining, by an integrated controller controlling a first module among the plurality of modules, a rated power value of the load; The integrated controller determines the number of maximum efficiency operation modules to be operated in maximum efficiency mode to supply power to the load among the plurality of modules using the determined rated power value, and the number of general operation modules to be operated in normal operation mode. Calculating the number of driving modules; selecting, by the integrated controller, as many modules as the calculated number of maximum efficiency operation modules and the number of general operation modules among the plurality of modules; transmitting, by the integrated controller, an operation command together with operation mode information to slave controllers that respectively control the selected modules; and controlling operations of corresponding modules by using the driving mode information received by the integrated controller and the slave controllers.

In this case, the step of determining the rated power value of the load may include increasing, by the integrated controller, output voltage values and current values of the plurality of modules by predetermined values at predetermined time intervals; determining, by the integrated controller, whether output voltage values and current values of the plurality of modules do not change for a predetermined time; And when the integrated controller determines that the output voltage and current values of the plurality of modules do not change for the predetermined time, the rated power value of the load is determined using the finally increased output voltage and current values. steps may be included.

At this time, the integrated controller may be configured to simultaneously operate the plurality of modules to determine the rated power value of the load.

At this time, the number of maximum efficiency operation modules to be operated in the maximum efficiency mode is an integer value obtained by dividing the rated power value of the load by the rated power value of an arbitrary module among the plurality of modules, and The number of normal driving modules to be operated is one, and the driving power value of the general driving module may be the ratio of the fractional value of the divided value to the rated power value of the general driving module.

In this case, the operation mode information may include the maximum efficiency mode and the general operation mode, and the operation command may include information on the ratio of general operation modules operated in the normal operation mode.

In this case, a parameter designating a number of each module is given to the plurality of modules, and the selecting may be a step of sequentially selecting a module having a low value of the parameter.

In this case, the integrated controller may be configured to count the number of operations, and the integrated controller may be configured to increase a parameter value given to the plurality of modules by one whenever the number of operations increases.

In this case, when the increased parameter value exceeds the maximum number of the plurality of modules, the increased parameter value may be changed to the lowest parameter value.

A maximum efficiency power supply device according to one aspect of the present invention includes a plurality of modules connected in parallel to a load to supply power to the load; an integrated controller controlling a first module among the plurality of modules; and slave controllers respectively controlling remaining modules other than the first module among the plurality of modules. At this time, the integrated controller determines the rated power value of the load, the number of maximum efficiency operation modules to be operated in maximum efficiency mode to supply power to the load among the plurality of modules, and the normal operation mode. It is designed to calculate the number of general operation modules to be operated, and the integrated controller selects as many modules as the calculated number of maximum efficiency operation modules and the number of general operation modules from among the plurality of modules, It is designed to deliver an operation command together with operation mode information to slave controllers that control the selected modules, and the integrated controller and the slave controllers control the operation of the respective module using the operation mode information received. may be made to do.

At this time, in order to determine the rated power value of the load, the integrated controller increases the output voltage value and the current value of the plurality of modules by a predetermined value at each predetermined time interval, and the output voltage value of the plurality of modules It is determined whether the overcurrent value does not change for a predetermined time, and when it is determined that the output voltage and current values of the plurality of modules do not change for the predetermined time, using the finally increased output voltage and current values It may be arranged to determine the rated power value of the load.

At this time, the integrated controller may be configured to simultaneously operate the plurality of modules to determine the rated power value of the load.

At this time, a parameter designating each module is assigned to the plurality of modules, the integrated controller is configured to count the number of operations, and the integrated controller controls the plurality of modules whenever the number of operations increases. The parameter value assigned to s may be set to increment by one.

In this case, when the increased parameter value exceeds the maximum number of the plurality of modules, the increased parameter value may be changed to the lowest parameter value.

According to the present invention, it is possible to provide a method for operating a power supply device with maximum efficiency using a plurality of modules without a separate external controller exchanging commands with a higher controller.

According to the present invention, the maximum power point of an unknown load can be determined in a short time.

According to the present invention, it is possible to provide a circular operation method of sequentially operating all modules by solving the problem that only a specific module among the modules has a high operating frequency.

1 shows a power supply device according to an embodiment of the present invention and a load connected to the power supply device.
FIG. 2 is a flowchart illustrating steps for performing an operation method with maximum efficiency using the power supply device of FIG. 1 according to an embodiment of the present invention.
3 is a graph for explaining step S10 of FIG. 2 according to an embodiment of the present invention.
FIG. 4 is a flowchart for explaining detailed steps of step S10 of FIG. 2 according to an embodiment of the present invention.
5 is a table for explaining a method for selecting a circulation module according to a parameter designating each module and the number of operation of a power supply according to an embodiment of the present invention.
6 is a flowchart illustrating a method of selecting a circulation module according to the number of operating times of a power supply device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be implemented in various other forms. Terms used in this specification are intended to aid understanding of the embodiments, and are not intended to limit the scope of the present invention. Also, the singular forms used herein include the plural forms unless the phrases clearly dictate the contrary.

1 shows a power supply device according to an embodiment of the present invention and a load connected to the power supply device.

The power supply device 1 may include a plurality of modules 10, 20, 30, ....

Load 100 may be connected in parallel to a plurality of modules (10, 20, 30, ...).

Each of the plurality of modules 10, 20, 30, ... may be controlled by a corresponding controller.

Among the plurality of modules 10, 20, 30, ..., the first module 10 may be controlled by the integrated controller 11. Among the plurality of modules 10, 20, 30, ..., the second module 20 may be controlled by the first slave controller 21. Among the plurality of modules 10, 20, 30, ..., the n-th module 30 may be controlled by the n−1-th slave controller 31.

The configuration of a separate upper controller may not be provided in the power supply device 1 of the present invention. Therefore, in the embodiment of the present invention, the integrated controller 11 can serve as a command distribution of the upper controller. That is, the integrated controller 11 may calculate the power to be distributed to the first module 10 to the n-th module 31 and deliver a power command to the slave controllers controlling each module. At this time, the integrated controller 11 may deliver commands to each slave controller through RS-485 or RS-232C communication method. Also, as described above, the integrated controller 11 may control the generation of current output of the first module 10 .

The first slave controller 21 to the n−1th slave controller 31 may control the output power of the module according to a command received from the integrated controller 11 .

To this end, PWM signal generators 12, 22, 32, ... may be connected to each module 10, 20, 30, .... Specifically, the integrated controller 11 and each slave controller 21, 31, ... can control the output power of the module by controlling the PWM signal generator 12, 22, 32, ....

AC input power may be input to the input terminal of each module (10, 20, 30, ...).

Between the first output terminal of each module (10, 20, 30, ...) and one terminal of the load 100, in order to recognize (determine) the maximum power point of the load 100, each module (10, 20, CT sensors 13, 23, 33, ... for measuring the current output from 30, ...) may be connected. And the second output terminal of each module (10, 20, 30, ...) can be connected to the other terminal of the load (100). For example, the first CT sensor 13 may be connected between the first output terminal of the first module 10 and one terminal of the load 100, and the first output terminal of the second module 20 and the load 100 A second CT sensor 23 may be connected between one terminal of , and an nth CT sensor 33 may be connected between the first output terminal of the nth module 30 and one terminal of the load 100 .

At this time, values detected by each CT sensor may be transmitted to the integrated controller 11.

FIG. 2 is a flowchart illustrating steps for performing an operation method with maximum efficiency using the power supply device of FIG. 1 according to an embodiment of the present invention.

Hereinafter, it will be described with reference to FIGS. 1 and 2 together.

In step S10, the integrated controller 11 may determine the rated power value of the load 100.

In step S20, the integrated controller 11 enters the maximum efficiency mode to supply power to the load 100 among the plurality of modules 10, 20 30, ... using the determined rated power value. The number of maximum efficiency operation modules to be operated and the number of normal operation modules to be operated in the general operation mode can be calculated. Hereinafter, it may be referred to as operation mode information including the maximum efficiency mode and the general operation mode. The maximum efficiency mode may refer to a mode in which all of the rated power of an arbitrary module among the modules is used. Also, the normal operation mode may refer to a mode in which only a portion of the rated power of the module is used. At this time, the rated power of each of the plurality of modules may be the same as each other.

In step S30, the integrated controller 11 selects as many modules as the calculated number of maximum efficiency operation modules and the number of general operation modules among a plurality of modules 10, 20 30, ... can

In step S40, the integrated controller 11 may transmit an operation command along with operation mode information to the slave controllers that respectively control the selected modules.

In step S50, the integrated controller 11 and the slave controllers can control the operation of each corresponding module using the operation mode information received.

3 is a graph for explaining step S10 of FIG. 2 according to an embodiment of the present invention.

The horizontal axis of the graph represents time (t) and the vertical axis represents current value (I).

FIG. 4 is a flowchart for explaining detailed steps of step S10 of FIG. 2 according to an embodiment of the present invention.

Hereinafter, it will be described with reference to FIGS. 1, 3, and 4 together.

In step S11, the integrated controller 11 may increase the output voltage and current values of the plurality of modules 10, 20, 30, ... by a predetermined value every predetermined time interval. For example, as shown in FIG. 3, the integrated controller 11 may increase the current values of the plurality of modules 10, 20, 30, ... by 10A per second. For example, each module can output a current of 10A at time t1, and each module can output a current of 20A at time t2, 1 second has passed from time t1.

In step S12, the integrated controller 11 may determine whether the output voltage values and current values of the plurality of modules 10, 20, 30, ... do not change for a predetermined time period T. For example, when the predetermined time T is 10 seconds, the integrated controller 11 may determine whether current values of the plurality of modules 10, 20, 30, ... do not change for 10 seconds. At this time, if it does not change for less than 10 seconds, step S11 may be performed again, and if it does not change for 10 seconds, step S13 may be performed. For example, as shown in FIG. 3 , when the output current value of each module is the same as 60A for 10 seconds from the time tk to the time tk+10, step S13 may be performed.

At this time, the output current value of each module (10, 20, 30, ...) is obtained through the CT sensor (13, 23, 33, ...) connected to each module (10, 20, 30, ...). can be detected.

In step S13, when the integrated controller 11 determines that the output voltage and current values of the plurality of modules 10, 20, 30, ... do not change for a predetermined time T, the last The rated power value of the load 100 may be determined using the increased output voltage value and current value (eg, 60A). That is, a value obtained by multiplying the output voltage value and the current value may be the rated power value of the load 100 .

At this time, when determining the maximum power point (ie, voltage value and current value) of the load 100 by sequentially operating the individual modules one by one, it may take a rather long time. However, as described above in steps S11 to S13, when each output voltage value and current value of the plurality of modules 10, 20, 30, ... (ie, all modules) are simultaneously increased, There is an effect that it is possible to recognize the maximum power point of the load 100 in a short time.

At this time, in step S11, the integrated controller 11 sets the output voltage and current values of the plurality of modules 10, 20, 30, ... in advance at predetermined time intervals (eg, 1 second). In order to increase by a determined value (eg, 10A), a command for this may be transmitted to the slave controllers.

Hereinafter, a method for calculating the number of maximum efficiency driving modules and the number of general driving modules in step S20 will be described.

In the above-described step S13, after the maximum rated power value of the load is determined, the step S20 of FIG. 2 may be performed.

At this time, in an embodiment of the present invention, the rated power of all modules may be the same. For example, the rated power of all modules may be 20 kW.

For example, a value obtained by dividing the maximum rated power (eg, 90 kW) of the load 100 by the rated power (eg, 20 kW) of a module (eg, 4.5) may be an individual operation command transmitted to each module.

Specifically, the integer value (eg, 4) of the divided value (eg, 4.5) may be the number of maximum efficiency driving modules that should be operated in maximum efficiency mode.

At this time, the number of general operation modules may be set to one. Accordingly, a decimal value (eg, 0.5) of the divided value (eg, 4.5) may be a value for determining the module driving power of the normal driving module to be operated in the normal driving mode. That is, the operating power value of the general driving module may be the power (eg, 20kW*0.5=10kW) as much as the ratio of the fractional value (eg, 0.5) of the divided value to the rated power value (eg, 20kW).

Therefore, it can be assumed that there are a total of 5 modules in FIG. 1 . If so, in step S30 described above with reference to FIG. 2 , the first module, the second module, the third module, and the fourth module may be sequentially selected by four, which is the number of maximum efficiency driving modules. Also, the fifth module may be selected as the general driving module. At this time, the first module, the second module, the third module, and the fourth module may be operated with rated power of 20 kW, and the fifth module may be operated with 10 kW of power equal to the ratio of the decimal value (20 kW * 4 +10kW=90kW).

In this case, a parameter designating each module may be assigned to the plurality of modules (eg, the first to fifth modules).

Hereinafter, parameters designating each module will be described with reference to FIGS. 1 and 5 .

5 is a table for explaining a method for selecting a circulation module according to a parameter designating each module and the number of operation of a power supply according to an embodiment of the present invention.

Each field of the table represents the number of operations and parameters of the first to fifth modules.

For example, when the initial number of operations is 1, the parameters designating the first module (eg, the first module 10 in FIG. 1) are M1 and the second module (eg, the second module 20 in FIG. 1) A parameter specifying M2, a parameter specifying the third module M3, a parameter specifying the fourth module M4, and a parameter specifying the fifth module M5 may be specified in advance.

At this time, in step S30, the maximum efficiency operation module and the general operation module may be sequentially selected from a module having a low parameter. Accordingly, when the number of operations is one time, the first module M1 to the fourth module M4 may be selected as the maximum efficiency operation modules, and the last module M5 may be selected as the general operation module. Therefore, even if the number of times of operation of the power supply device 1 increases in this embodiment, the module having the parameter M5 can be a general operation module. This will be described in more detail below.

Therefore, in step S40 described above in FIG. 2, the integrated controller 11 may transmit maximum efficiency mode information as operation mode information to the first slave controller to the third slave controller controlling the second to fourth modules. . Further, the integrated controller 11 sends general operation mode information as operation mode information to the fourth slave controller controlling the fifth module, and power ratio information to be operated for the rated power value (or already calculated power value to be operated). ) can be transmitted together.

Thereafter, the integrated controller and the first to fourth slave controllers may control the operation of the first to fifth modules at the first operation.

6 is a flowchart illustrating a method of selecting a circulation module according to the number of operating times of a power supply device according to an embodiment of the present invention.

Hereinafter, it will be described with reference to FIGS. 5 and 6 together.

In step S31, the integrated controller 11 may increase the number of operations by one. That is, the integrated controller 11 may count the number of times the power supply device 1 is operated. For example, the number of times of operation may be increased to become the second operation.

In step S32, the integrated controller 11 may increase the parameter values of the maximum efficiency driving modules to be operated and the general driving module by 1. For example, through step S31, when it is the second operation, the first module M1 has a parameter M2 with a parameter value increased by 1, and the second module M2 has a parameter value increased by 1 has a parameter M3, the third module M3 has a parameter M4 by increasing the value of the parameter by 1, the fourth module M4 has a parameter M5 by increasing the value of the parameter by 1, and The fifth module M5 may have a parameter M6 by increasing the value of the parameter by 1.

In step S33, the integrated controller 11 may determine whether the parameter value of the module to be operated exceeds the maximum number. For example, the parameter of the fifth module has become M6. In this case, since the maximum number of modules is 5, it can be determined that the parameter value of the fifth module exceeds the maximum number.

In step S34, if the parameter value of the module to be operated exceeds the maximum number, the integrated controller may change the parameter value to the lowest parameter value. For example, the parameter value M6 of the fifth module may be changed to the parameter M1.

Therefore, referring to FIG. 5 , in the second operation, the 5th module, the 1st module, the 2nd module, and the 3rd module can be selected from the 4 maximum efficiency operation modules in the order of lowest parameter values, and the 4th module may serve as a general operation module.

For example, steps S31 to S34 may be performed in the same way even in the third driving cycle. As a result, the 4th module, the 5th module, the 1st module, and the 2nd module can be selected in the order of the lowest parameter value, and the 3rd module can serve as a general operation module. .

Steps S31 to S34 may be performed after step S50 is performed at the first driving cycle. Step S40 may be performed by determining the operation mode of each module in step S30 according to the parameter values of the maximum efficiency driving modules determined through steps S31 to S34 and the general driving module. That is, from the second operation, steps S30, S40, and S50 including steps S31 to S34 may be repeatedly performed as one set.

When the maximum efficiency operation module is selected by sequentially selecting modules having low parameter values, there is a problem that stress may occur because the first module is always operated at rated power. However, by performing the circulation operation through steps S31 to S34, the stress of the first module having a low parameter value can be reduced.

In the above-described embodiment, the total number of modules is 5, but the total number may vary depending on the embodiment.

Using the above-described embodiments of the present invention, those belonging to the technical field of the present invention will be able to easily implement various changes and modifications without departing from the essential characteristics of the present invention. The content of each claim of the claims may be combined with other claims without reference relationship within the scope understandable through this specification.

Claims (13)

A method of operating a plurality of modules connected in parallel to a load to supply power to the load, comprising:
determining, by an integrated controller controlling a first module among the plurality of modules, a rated power value of the load;
The integrated controller determines the number of maximum efficiency operation modules to be operated in maximum efficiency mode to supply power to the load among the plurality of modules using the determined rated power value, and the number of general operation modules to be operated in normal operation mode. Calculating the number of driving modules;
selecting, by the integrated controller, as many modules as the calculated number of maximum efficiency operation modules and the number of general operation modules among the plurality of modules;
transmitting, by the integrated controller, an operation command together with operation mode information to slave controllers that respectively control the selected modules; and
controlling operations of corresponding modules by using the operation mode information received by the integrated controller and the slave controllers;
including,
Unit module maximum efficiency operation method. The method of claim 1, wherein determining the rated power value of the load comprises:
increasing, by the integrated controller, output voltage values and current values of the plurality of modules by predetermined values at predetermined time intervals;
determining, by the integrated controller, whether output voltage values and current values of the plurality of modules do not change for a predetermined time; and
When the integrated controller determines that the output voltage and current values of the plurality of modules do not change for the predetermined time, finally determining the rated power value of the load using the increased output voltage and current values step
including,
Unit module maximum efficiency operation method. The method according to claim 1, wherein the integrated controller operates the plurality of modules simultaneously to determine the rated power value of the load. According to claim 1,
The number of maximum efficiency operation modules to be operated in the maximum efficiency mode is an integer value obtained by dividing the rated power value of the load by the rated power value of any module among the plurality of modules,
The number of general operation modules that need to be operated in the normal operation mode is one, and the operating power value of the general operation module is the ratio of the fractional value of the divided value to the rated power value of the general operation module.
Unit module maximum efficiency operation method. According to claim 4,
The operation mode information includes the maximum efficiency mode and the general operation mode,
The operation command includes information on the ratio for the general operation module operated in the general operation mode.
Unit module maximum efficiency operation method. According to claim 1,
A parameter designating the number of each module is assigned to the plurality of modules,
The selecting step is a step of sequentially selecting a module having a low value of the parameter,
Unit module maximum efficiency operation method. According to claim 6,
The integrated controller is configured to count the number of operations,
The integrated controller is configured to increase one parameter value given to the plurality of modules whenever the number of operations increases.
Unit module maximum efficiency operation method. The method according to claim 7, wherein the increased parameter value is changed to the lowest parameter value when the increased parameter value exceeds the maximum number of the plurality of modules. a plurality of modules connected in parallel to the load to supply power to the load;
an integrated controller controlling a first module among the plurality of modules; and
slave controllers respectively controlling remaining modules except for the first module among the plurality of modules;
Including,
The integrated controller determines the rated power value of the load, the number of maximum efficiency operation modules that need to operate in maximum efficiency mode to supply power to the load among the plurality of modules, and needs to operate in normal operation mode. It is designed to calculate the number of general operation modules that
The integrated controller selects as many modules as the calculated number of maximum efficiency operation modules and the number of general operation modules from among the plurality of modules, and provides operation mode information and information to slave controllers respectively controlling the selected modules. together to transmit driving commands; and
The integrated controller and the slave controllers are configured to control the operation of each corresponding module using the operation mode information received.
Maximum Efficiency Power Supply. The method of claim 9, in order to determine the rated power value of the load,
The integrated controller,
Increasing the output voltage and current values of the plurality of modules by a predetermined value every predetermined time interval;
determining whether output voltage values and current values of the plurality of modules do not change for a predetermined time; and
When it is determined that the output voltage and current values of the plurality of modules do not change for the predetermined time, the rated power value of the load is determined using the finally increased output voltage and current values.
Maximum Efficiency Power Supply. 10. The maximum efficiency power supply according to claim 9, wherein the integrated controller is adapted to simultaneously operate the plurality of modules to determine the rated power value of the load. The method of claim 9, wherein a parameter specifying each module is assigned to the plurality of modules,
The integrated controller is configured to count the number of operations, and
The integrated controller is configured to increase one parameter value given to the plurality of modules whenever the number of operations increases.
Maximum Efficiency Power Supply. The maximum efficiency power supply according to claim 12, wherein the increased parameter value is changed to the lowest parameter value when the increased parameter value exceeds the maximum number of the plurality of modules.

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