KR20160080872A - System and method of controlling master-slave uninterrupted power supply with active master determination ability - Google Patents
System and method of controlling master-slave uninterrupted power supply with active master determination ability Download PDFInfo
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- KR20160080872A KR20160080872A KR1020140192574A KR20140192574A KR20160080872A KR 20160080872 A KR20160080872 A KR 20160080872A KR 1020140192574 A KR1020140192574 A KR 1020140192574A KR 20140192574 A KR20140192574 A KR 20140192574A KR 20160080872 A KR20160080872 A KR 20160080872A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
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Abstract
Description
The following embodiments relate to an uninterruptible power supply system, and more particularly to a system for parallel operation control of a master slave uninterruptible power supply.
Recently, due to the development of IT industry, loads that are sensitive to power environment such as computer and communication equipment are increasing. As a result, demand for stable power sources is increasing rapidly. However, in a typical power system there is a possibility that power supply is temporarily limited due to an unexpected accident, and the interruption of computers and information systems caused by such power system accidents can cause tremendous social loss and confusion. Thus, to overcome the limitations of the power system, it is possible to supply power through an uninterruptible power supply (UPS).
As the importance of the uninterruptible power supply system increases, the demand of the uninterruptible power supply is greatly increased. Therefore, the problem of increasing the capacity of the uninterruptible power supply has become one of important technologies. However, due to the limitations of the switching device due to the increase in the capacity of the uninterruptible power supply, the increase in the volume, the increase in the price, etc., the development of the single UPS has been limited. Also, in case of a single uninterruptible power supply, when the uninterruptible power supply is stopped in case of an accident, it has a disadvantage that it can have a large influence on the load. One of the means of securing these disadvantages is parallel operation control. Parallel operation control can compensate for the disadvantages of a single uninterruptible power supply system. Unlike the DC power supply, the parallel operation of the uninterruptible power supply must be able to perform load sharing with each inverter being synchronized with each other. Theoretically, if the voltage outputs of the inverters have the same magnitude, the same frequency, and the same phase difference, and the line impedance between the inverters is the same, then the load current is evenly distributed. However, since it is difficult to satisfy such an abnormal condition in practice, the load sharing between the inverters is deviated and a circulating current flows between the inverters connected to each other. The circulating current eventually causes the inverter to overload and raise the DC-link voltage to shut down the uninterruptible power supply system. Therefore, it is essential to control the circulating current flowing between the uninterruptible power supply units during parallel operation of the uninterruptible power supply unit, so that an algorithm that keeps the amount of load current shared by each uninterruptible power supply unit is necessary.
The master slave uninterruptible power supply parallel operation control method has an advantage that there is no external controller for parallel operation. In addition, the number of uninterruptible power supply units is not required for parallel control, and the master uninterruptible power supply unit provides the control reference value to each slave uninterruptible power supply unit, so that the implementation is simple. However, the master slave uninterruptible power supply parallel operation control method is dependent on the master uninterruptible power supply since the master uninterruptible power supply has both control value reference and control command priority. For this reason, there is a need for a master designation algorithm that allows one of the remaining slave uninterruptible power supply units to take the master right if an error occurs in the master uninterruptible power supply. A common master assignment algorithm is how the current master uninterruptible power supply transfers its master authority to another uninterruptible power supply. However, if a failure or a communication error occurs before the master uninterruptible power supply passes the authority, the other uninterruptible power supply unit will not receive the master uninterruptible power supply authority and the parallel control reference value will be lost, and the entire uninterruptible power supply parallel operation system will be stopped . ≪ / RTI >
According to the embodiments, even if an error occurs in the master uninterruptible power supply in the master slave uninterruptible power supply parallel operation system, it is possible to provide a technique for allowing another uninterruptible power supply to inherit the master right.
According to the embodiments, it is possible to provide a technique for allowing the uninterruptible power supply unit to determine whether it has master or slave right itself.
According to one embodiment, an uninterruptible power supply system including a plurality of uninterruptible power supply units supporting parallel operation can be provided. The uninterruptible power supply system may include a communication unit for connecting the plurality of uninterruptible power supply units to each other, a plurality of data areas allocated to the plurality of uninterruptible power supply units, And a processor for adjusting the master authority among the plurality of uninterruptible power supply units with reference to the stored status information.
According to one aspect of the present invention, when data is normally received through the communication unit, the processor sets status information stored in a memory area allocated to the normally received uninterruptible power supply unit to a set state, The set state can be cleared after a lapse of time.
According to another aspect, the processor identifies at least one uninterruptible power supply deviated from parallel operation when the state information stored in the plurality of data areas is not all set to a set state, and the plurality of uninterruptible power supply units The master authority can be adjusted for the remaining uninterruptible power supply units except the identified at least one uninterruptible power supply unit.
According to another aspect, the plurality of uninterruptible power supply units may be sequentially given order numbers indicating master and slave relationships.
In this case, the memory further includes a data area for indicating a slave state, and the processor is configured to set a slave state of the uninterruptible power supply unit whose sequence number is one step lower than that of the plurality of uninterruptible power supply units, .
When the at least one uninterruptible power supply unit of the plurality of uninterruptible power supply units deviates from the uninterruptible power supply unit in parallel operation, the processor may select one of the plurality of uninterruptible power supply units, It is possible to grant the master authority to the uninterruptible power supply unit having the highest sequence number.
The slave state of the uninterruptible power supply having the highest sequence number among the plurality of uninterruptible power supply units can be always cleared.
According to an embodiment, the communication unit can connect the plurality of uninterruptible power supply units to each other through CAN communication.
According to one embodiment, a parallel operation control method of an uninterruptible power supply system including a plurality of uninterruptible power supply units is provided. At this time, a parallel operation control method of an uninterruptible power supply system includes connecting a plurality of uninterruptible power supply units in parallel using a communication bus, assigning an order to a plurality of uninterruptible power supply units connected in parallel, Storing status information of the apparatuses in a plurality of data areas based on the order of the numbers; checking status information of the plurality of uninterruptible power supply units at predetermined intervals of time; And adjusting the master authority between the master and the master.
According to one aspect of the present invention, there is provided a parallel operation control method for an uninterruptible power supply system, the method comprising: when data is normally received in a first uninterruptible power supply, state information stored in a memory area allocated to the first uninterruptible power supply , And clearing the set state after a predetermined time has elapsed.
According to another aspect of the present invention, the step of adjusting the master authority among the plurality of uninterruptible power supply units with reference to the status information includes: when at least one uninterruptible power supply unit among the plurality of uninterruptible power supply units is disconnected from the parallel operation, And granting the master authority to the uninterruptible power supply unit having the highest sequence number among the uninterruptible power supply units other than the at least one uninterruptible power supply unit deviated from the plurality of uninterruptible power supply units.
According to another aspect, adjusting the master authority among the plurality of uninterruptible power supply units with reference to the status information may include granting a master authority to the uninterruptible power supply unit having the highest sequence number.
Master Slave Uninterruptible Power Supply Even if an uninterruptible power supply fails in a parallel operation system, other uninterruptible power supply units can inherit master authority.
The uninterruptible power supply can itself determine whether it has master or slave rights.
1 is a view for explaining a parallel control method of a master slave type uninterruptible power supply.
2 is a diagram for explaining a parallel controller of the master slave type uninterruptible power supply.
3 is a diagram for explaining an inverter unit of the uninterruptible power supply unit.
4 is a diagram for explaining a CAN (Controller Area Network) communication method.
5 is a block diagram illustrating an uninterruptible power supply apparatus according to an embodiment.
6 is a view for explaining an uninterruptible power supply system according to an embodiment.
FIG. 7 is a view for explaining an embodiment for receiving the status information and setting the master authority.
8 is a flowchart illustrating a parallel operation control method of an uninterruptible power supply system including a plurality of uninterruptible power supply units according to an embodiment.
It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.
Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.
The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.
1 is a view for explaining a parallel control method of a master slave type uninterruptible power supply.
1, the master slave uninterruptible power supply system includes a first uninterruptible power supply (UPS) 111, a second uninterruptible power supply (UPS) 112, a third uninterruptible power supply (UPS) 113, May include a
In the uninterruptible power supply system, one of the plurality of uninterruptible power supply units may be designated as the master uninterruptible power supply unit, and the remaining uninterruptible power supply units may be designated as the slave uninterruptible power supply unit. According to the embodiment, the first
2 is a diagram for explaining a parallel controller of the master slave type uninterruptible power supply.
Referring to FIG. 2, the process of the parallel controller included in the slave uninterruptible power supply apparatus according to one embodiment can be confirmed. An error between the output
3 is a diagram for explaining an inverter unit of the uninterruptible power supply unit.
Referring to FIG. 3, the inverter unit of the uninterruptible power supply unit can receive the output voltage reference value from the parallel controller of FIG. 2 to control the inverter output voltage. A control method using the DQ model can be used as the control method. Here, the control method using the DQ model is a control method in which an AC variable is converted into a DC variable, and then the AC variable is converted into an AC variable. According to an embodiment, a current controller using an inductor current may be added to improve control stability and transient characteristics.
4 is a diagram for explaining a CAN (Controller Area Network) communication method. CAN was first developed in 1985 by Bosch for vehicle networks and has been widely used for control of various electronic devices. CAN communication has the advantage of being able to construct an economical and stable network in which several CAN devices can communicate with each other. In addition, the CAN controller can see all messages sent to all devices connected to the CAN bus. Referring to FIG. 4, in the CAN (Controller Area Network) communication, the
According to the embodiment, the
5 is a view for explaining an uninterruptible
Referring to FIG. 5, a first uninterruptible power supply (UPS) 521, a second uninterruptible power supply (UPS) 522, and a second uninterruptible power supply (UPS) A third uninterruptible power supply (UPS) 523, a fourth uninterruptible power supply (UPS) 524 and an nth
The uninterruptible power supply system according to one embodiment may include a plurality of uninterruptible
According to one embodiment, the sequence numbers representing the master and slave relationships may be given to the plurality of uninterruptible power supply units in order. At this time, the sequence number indicating the master and slave relationship may be a priority for granting master authority. In the embodiment according to FIG. 5, a first uninterruptible power supply (UPS) 521, a second uninterruptible power supply (UPS) 522, a third uninterruptible power supply (UPS) 523, and a fourth uninterruptible power supply UPS) 524 in the order of priority. That is, the first uninterruptible power supply may be the highest priority uninterruptible power supply for receiving master authority. If the first uninterruptible power supply deviates from the parallel operation, the second uninterruptible power supply can be the highest priority uninterruptible power supply.
According to one embodiment,
Each uninterruptible power supply can store a register including a plurality of mailboxes. At this time, each uninterruptible power supply can have its own MailBoxes. Data of the first uninterruptible power supply can be recorded in the MailBox0 and MailBox1 of all the uninterruptible power supply units. The data information of the second uninterruptible power supply can be recorded in the MailBox2 and the MailBox3 of all the uninterruptible power supply units. Hereinafter, two mailboxes may be paired to record data information for one uninterruptible power supply. In this way, you can observe the control values and status values of all uninterruptible power supplies in each uninterruptible power supply. Therefore, even if the master uninterruptible power supply is changed, the controller input value can be stably changed.
Each of the uninterruptible
According to one embodiment, the first uninterruptible power supply uses MailBox0 and MailBox1 as a transmission mailbox of the first uninterruptible power supply, and the remaining mailboxes are connected to the remaining uninterruptible power supply It can be used as a receiving mailbox for devices. For example, in the second uninterruptible power supply apparatus, MailBox2 and MailBox3 are used as transmission mailboxes of the second uninterruptible power supply, and the remaining mailboxes are connected to the remaining uninterruptible power supply apparatuses other than the second uninterruptible power supply apparatus among the plurality of uninterruptible power supply apparatuses Can be used as incoming mailbox.
According to one embodiment, the command sent and received in each uninterruptible power supply may include a slave flag. Here, it is possible to determine whether the uninterruptible power supply apparatus is a master or a slave through the slave flag. When the state of the slave flag becomes set, the uninterruptible power supply becomes the slave state, and when the state of the slave flag becomes clear, the uninterruptible power supply becomes the master state.
According to an embodiment, an uninterruptible power supply having a higher sequence number among the plurality of uninterruptible power supply units can set the slave state of the uninterruptible power supply unit whose order is one step lower. That is, the uninterruptible power supply having the higher sequence number can determine the slave flag state of the uninterruptible power supply immediately below. For example, the first uninterruptible power supply can determine the slave flag state of the second uninterruptible power supply. If the first uninterruptible power supply unit sets the slave flag of the second uninterruptible power supply unit, the second uninterruptible power supply unit becomes the slave unit. If the first uninterruptible power supply clears the slave flag of the second uninterruptible power supply, the second uninterruptible power supply becomes the master state.
According to one embodiment, the slave state of the uninterruptible power supply apparatus having the highest sequence number among the plurality of uninterruptible power supply apparatuses may be always 'clear'. For example, since there is no uninterruptible power supply capable of controlling the slave flags of the first uninterruptible power supply, the slave flag of the first uninterruptible power supply maintains a clear state at all times, and the first uninterruptible power supply It is possible to maintain the master state as long as it does not deviate from the parallel operation.
According to an embodiment, when the master authority is duplicated, an uninterruptible power supply having a high sequence number can be granted a master authority. For example, when the plurality of uninterruptible power supply units are operating in parallel, if the second uninterruptible power supply unit to which the master authority is not granted departs from the parallel connection, the slave flag of the third uninterruptible power supply unit is cleared, The device is eligible to be granted master authority. At this time, since the master right of the first uninterruptible power supply unit is maintained, the first uninterruptible power supply unit of higher sequence number can be granted the master right.
6 is a block diagram illustrating an uninterruptible power supply apparatus according to an embodiment.
Referring to FIG. 6, an
According to one embodiment, the
According to one embodiment, the
According to one embodiment, the memory may include a plurality of data areas allocated for each of a plurality of uninterruptible power supply units. Data of the first uninterruptible power supply can be recorded in the MailBox0 and MailBox1 of all the uninterruptible power supply units. The data information of the second uninterruptible power supply can be recorded in the MailBox2 and the MailBox3 of all the uninterruptible power supply units. Hereinafter, two mailboxes may be paired to record data information for one uninterruptible power supply.
According to one embodiment, the
According to one embodiment, the
According to one embodiment, when data is normally received in each uninterruptible power supply, the
According to one embodiment, the set and clear of the slave flag can be determined by the uninterruptible power supply unit of the higher order than the uninterruptible power supply unit corresponding to the slave flag. For example, the slave state of the second uninterruptible power supply can be determined by the first uninterruptible power supply. At this time, if the first uninterruptible power supply unit sets the slave flag of the second uninterruptible power supply unit, the second uninterruptible power supply unit can become the slave state. When the first uninterruptible power supply clears the slave flag of the second uninterruptible power supply, the second uninterruptible power supply can be in the master state. It can also be applied to other sequence numbers. At this time, since there is no uninterruptible power supply for determining the state of the slave flag of the first uninterruptible power supply, the slave flag is always kept clear, and the first uninterruptible power supply unit is given the master right.
According to one embodiment, the
According to one embodiment, when at least one uninterruptible power supply of a plurality of uninterruptible power supply units deviates from parallel operation, the
FIG. 7 is a view for explaining an embodiment for receiving the status information and setting the master authority.
Referring to FIG. 7,
According to an embodiment, when the communication is normally maintained, each uninterruptible power supply unit can set the slave state of the next uninterruptible power supply. Here, the slave state may be a slave flag among the commands stored in the mailbox corresponding to each uninterruptible power supply. However, when the communication can not be normally maintained as in the case where the master uninterruptible power supply unit is burned down, the master authority may not be handed over.
According to one embodiment, when data is received via the communication bus, each uninterruptible power supply can check the
According to the above-described embodiment, even if there is deviation of the master uninterruptible power supply unit, other slave uninterruptible power supply units actively operate as the master uninterruptible power supply unit and have the master discrimination ability.
8 is a flowchart illustrating a parallel operation control method of an uninterruptible power supply system including a plurality of uninterruptible power supply units according to an embodiment.
Referring to FIG. 8, in
An uninterruptible power supply system including a plurality of uninterruptible power supply units that support parallel operation includes a first uninterruptible power supply unit, a second uninterruptible power supply unit, a third uninterruptible power supply unit, a fourth uninterruptible power supply unit, and a second uninterruptible power supply unit via a communication bus (BUS) ■ The uninterruptible power supply can be connected. Where n can be increased from 2 to 16 as needed. At this time, CAN communication can be used as a communication method.
In
In
In
In
According to one embodiment, the command sent and received in each uninterruptible power supply may include a slave flag. Here, it is possible to determine whether the uninterruptible power supply apparatus is a master or a slave through the slave flag. When the state of the slave flag becomes set, the uninterruptible power supply becomes the slave state, and when the state of the slave flag becomes clear, the uninterruptible power supply becomes the master state.
According to one embodiment, a master authority can be given to an uninterruptible power supply having the highest sequence number. For example, the slave flag of the uninterruptible power supply unit having the highest sequence number among the plurality of uninterruptible power supply units can always be 'clear'. For example, since there is no uninterruptible power supply capable of controlling the slave flags of the first uninterruptible power supply, the slave flag of the first uninterruptible power supply maintains a clear state at all times, and the first uninterruptible power supply It is possible to maintain the master state as long as it does not deviate from the parallel operation.
According to an embodiment, when at least one uninterruptible power supply among the plurality of uninterruptible power supply units deviates from parallel operation, the remaining uninterruptible power supply units other than the at least one uninterruptible power supply unit that are separated from the plurality of uninterruptible power supply units The master authority can be given to the uninterruptible power supply apparatus having the highest sequence number among the apparatuses. For example, when the plurality of uninterruptible power supply units are operating in parallel, if the second uninterruptible power supply unit to which the master authority is not granted departs from the parallel connection, the slave flag of the third uninterruptible power supply unit is cleared, The device is eligible to be granted master authority. At this time, since the master right of the first uninterruptible power supply unit is maintained, the first uninterruptible power supply unit of higher sequence number can be granted the master right.
According to one aspect of the present invention, there is provided a parallel operation control method for an uninterruptible power supply system, the method comprising: when data is normally received in a first uninterruptible power supply, state information stored in a memory area allocated to the first uninterruptible power supply , And clearing the set state after a predetermined time has elapsed. It can be seen that state information stored in the memory area is maintained in a clear state, and it is determined whether data is normally received at predetermined time intervals, and in the case of normal reception, state information is set to a set state. Therefore, the uninterruptible power supply unit can check the slave flag, which is the status information, at predetermined intervals of time, to check whether the uninterruptible power supply units of the preceding sequence are in the normal connection state.
The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.
Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.
Claims (12)
Each of the uninterruptible power supply units
A communication unit for connecting the plurality of uninterruptible power supply units to each other;
And a plurality of data areas allocated to the plurality of uninterruptible power supply units, wherein status information indicating whether or not data is normally transmitted to the respective uninterruptible power supply units is stored in the plurality of data areas through the communication unit Memory; And
And controlling the master authority among the plurality of uninterruptible power supply units by referring to the stored status information.
And an uninterruptible power supply.
Wherein the processor sets status information stored in a memory area allocated to the normally received uninterruptible power supply unit to a set state when data is normally received through the communication unit to each of the uninterruptible power supply units, The set state is cleared
Uninterruptible power system.
Wherein the processor identifies at least one uninterruptible power supply deviated from parallel operation when state information stored in the plurality of data areas is not all set to a set state, The master authority is adjusted for the remaining uninterruptible power supplies except for the uninterruptible power supply of
Uninterruptible power system.
The order numbers representing the master and slave relationships are assigned to the plurality of uninterruptible power supply units one after another
Uninterruptible power system.
Wherein the memory further comprises a data area for indicating a slave status,
The processor sets the slave state of the uninterruptible power supply unit of which the order is one step lower than that of the uninterruptible power supply units of which the order is higher than that of the uninterruptible power supply units
Uninterruptible power system.
Wherein when at least one uninterruptible power supply unit of the plurality of uninterruptible power supply units deviates from the parallel operation, the processor selects one of the uninterruptible power supply units from the plurality of uninterruptible power supply units, To grant master authority to the uninterruptible power supply with the highest sequence number
Uninterruptible power system.
The slave state of the uninterruptible power supply unit having the highest sequence number among the plurality of uninterruptible power supply units is always cleared
Uninterruptible power system.
Wherein the communication unit connects the plurality of uninterruptible power supply units via CAN communication
Uninterruptible power system.
Connecting the plurality of uninterruptible power supply units in parallel using a communication bus;
Providing an order to a plurality of uninterruptible power supply units connected in parallel;
Storing state information of the plurality of uninterruptible power supply units in a plurality of data areas based on the order;
Checking status information of the plurality of uninterruptible power supply units at predetermined intervals of time; And
Adjusting the master authority among the plurality of uninterruptible power supply units by referring to the status information
Wherein the step of controlling the operation of the uninterruptible power supply system comprises the steps of:
Setting the state information stored in the memory area allocated to the normally received uninterruptible power supply device to a set state and clearing the set state after a predetermined time elapses when data is normally received in each of the uninterruptible power supply devices
Further comprising the steps of:
And adjusting the master authority among the plurality of uninterruptible power supply units by referring to the status information
When at least one uninterruptible power supply apparatus out of the plurality of uninterruptible power supply apparatuses deviates from the uninterruptible power supply apparatuses in parallel operation, among the uninterruptible power supply apparatuses other than the at least one uninterruptible power supply apparatus deviated from the plurality of uninterruptible power supply apparatuses, Steps to grant master authority to high uninterruptible power supply
And a plurality of uninterruptible power supply units including the plurality of uninterruptible power supply units.
Wherein the adjusting the master authority among the plurality of uninterruptible power supply units with reference to the status information comprises:
The step of granting the master authority to the uninterruptible power supply having the highest sequence number
And a plurality of uninterruptible power supply units including the plurality of uninterruptible power supply units.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102262986B1 (en) * | 2021-01-26 | 2021-06-09 | 주식회사 이온 | Modular ups and control methods based on module alternating operation with 2-way parallel operation |
| KR102303516B1 (en) * | 2021-04-30 | 2021-09-16 | 이길호 | Method and apparatus for synchronizing phase of uninterruptible power supply with parallel structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102262986B1 (en) * | 2021-01-26 | 2021-06-09 | 주식회사 이온 | Modular ups and control methods based on module alternating operation with 2-way parallel operation |
| KR102303516B1 (en) * | 2021-04-30 | 2021-09-16 | 이길호 | Method and apparatus for synchronizing phase of uninterruptible power supply with parallel structure |
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