KR20110051157A - Energy reduction type smart dc supply system - Google Patents

Abstract

PURPOSE: An energy reduction type smart DC system for supplying is provided to control capacity of transformer according to real consumption capacity in real time. CONSTITUTION: A direct current supply system(400) includes a silver stacked type transformer(410), a multiple input type rectifier(420), a controller(430), power supply lines(451,452), switches(441,442), and a temperature measuring unit(460). The stacked type transformer includes a plurality of unit transformers. A switch performs opening/closing operation about each power supply line. A controller generates a control signal directing the opening/closing operation about the power supply line. The controller generates a control signal by comparing consumption capacity about a DC power with capacity of AC power which the stacked type transformer supplies.

Description

Energy-saving smart DC supply system {ENERGY REDUCTION TYPE SMART DC SUPPLY SYSTEM}

The following embodiments are related to a power system for supplying a direct current generated by rectifying an alternating current. More specifically, the rectifier capacity of the transformer can be adjusted to an optimal level according to the amount of direct current consumption and the consumption capacity for the direct current. Rectification system.

The power produced at the power plant is high voltage AC power. However, many power devices use low voltage direct current power. Thus, a direct current supply system can be used to convert high power AC power into low voltage DC power.

Since the power consumption capacity of the power equipment is not constant, in most cases a DC supply system is installed based on the maximum power consumption capacity of the power equipment. In the case where the power equipments do not use the maximum power consumption capacity, the transformer of the direct current supply system causes loss due to overcapacity.

For example, if an electric vehicle is introduced in earnest, the office is expected to charge the electric vehicle after work in the morning. In this case, the power usage during the daytime of the office is very high, but the power consumption at home is very low. Conversely, while the office uses very little power during the night, the power usage in the home is very high. In this case, the DC supply system installed in the office is fully operational during the day, but there is a loss due to overcapacity during the night.

Therefore, there is a need for a DC supply system that can flexibly adjust the overall capacity of the DC supply system according to the actual consumption capacity for each time zone.

One side of the exemplary embodiments provides a direct current supply system capable of controlling the capacity of the transformer in real time according to the actual consumption capacity.

According to an embodiment of the present invention, a stack-type transformer including a plurality of unit transformers, receiving AC power from the stack-type transformer by using a power supply line corresponding to each of the unit transformer, and rectifies the received AC power A direct current supply system is provided that includes a multi-input rectifier for generating direct current power and a plurality of switches for opening and closing each of the power supply lines.

The control unit may further include a control unit configured to generate a control signal for each switch according to the power consumption for the DC power, and the switches may perform an opening / closing operation for each of the power supply lines according to the control signal for each switch. Can be.

The controller may estimate the amount of AC power supplied by the stack-type transformer when the opening operation is performed on at least one switch among the plurality of switches, and the capacity of the predicted AC power is the DC power. If greater than the consumption capacity for, the control signal can be generated to perform the opening operation.

The controller may generate the control signal to perform an input operation of at least one switch among the plurality of switches when the consumption capacity of the DC power is equal to or greater than a predetermined ratio of the capacity of the AC power. .

The controller may generate operation history information of each unit transformer based on the control signal.

The controller may perform life prediction of each unit transformer based on the operation history information.

The control unit may set an operation priority of each unit transformer and generate the control signal according to the operation priority.

The apparatus may further include a temperature measuring unit measuring a temperature of each unit transformer, and the controller may generate the control signal according to the measured temperature of each unit transformer.

According to another aspect of exemplary embodiments, a first unit transformer that receives AC power to generate a first voltage converted voltage and a second unit transformer that receives AC power to generate a second voltage converted voltage Stacked transformer, a multi-input rectifier for rectifying the first power and the second power into direct current power, a first power supply line and a second unit for transmitting the first power from the first unit transformer to the multi-input rectifier A second power supply line transmitting the second power from the transformer to the multi-input rectifier, a first switch performing an open / close operation on the first power supply line, and a second open / close operation on the second power supply line Provided is a direct-current supply system including a switch and a control unit for generating a control signal instructing an opening and closing operation for the first switch and the second switch. All.

The controller may estimate the amount of AC power supplied by the stack-type transformer when the opening operation is performed on at least one switch among the plurality of switches, and the capacity of the predicted AC power is the DC power. If greater than the consumption capacity for, the control signal can be generated to perform the opening operation.

The controller may generate the control signal to perform an input operation of at least one switch among the plurality of switches when the consumption capacity of the DC power is equal to or greater than a predetermined ratio of the capacity of the AC power. .

The controller may generate operation history information of the first unit transformer or the second unit transformer based on the control signal.

Here, the controller may perform life prediction of the first unit transformer or the second unit transformer based on the operation history information.

The control unit may set an operation priority of the first unit transformer or the second unit transformer and generate the control signal according to the operation priority.

According to one side of the exemplary embodiments, a direct current supply system capable of controlling the capacity of a transformer in real time according to actual consumption capacity is provided.

According to one side of the exemplary embodiments, a direct current supply system capable of controlling the capacity of a transformer in real time according to actual consumption capacity is provided.

1 is a diagram illustrating a structure of a DC supply system according to an exemplary embodiment.

The DC supply system 100 shown in FIG. 1 includes a stacked transformer 110 and a multi-input switch built-in rectifier 120. Stacked transformer 110 is a transformer that provides a total capacity, including a plurality of unit transformer (111, 112). For example, the stacked transformer 110 may provide a total capacity of 100 kVA using two 50 kVA unit transformers 111 and 112, or may provide a total capacity of 200 kVA using four 50 kVA dml unit transformers. In FIG. 1, an embodiment in which the stacked transformer 110 includes two unit transformers 111 and 112 is illustrated, but according to another exemplary embodiment, two or more transformers may also be included.

The stack-type transformer 110 receives an AC power of a high voltage and converts it to generate an AC power of a low voltage. The stacked transformer 110 may provide a separate AC power output for each unit transformer 111 and 112. The AC power output for each unit transformer 111 and 112 is transmitted to the multi-input type switch rectifier 120 using the power supply lines 151 and 152 corresponding to the unit transformers 111 and 112.

According to one side, the stack-type transformer 110 may transform the current by operating only a part of the unit transformer (111, 112). For example, when the transformer capacity of each of the unit transformers 111 and 112 is 50 kVA, the stacked transformer 110 may provide a transformer capacity of 100 kVA using two unit transformers. In this case, the transformation capacity of 100 kVA provided by the stacked transformer 110 may be referred to as supply AC power of the stacked transformer 110.

In addition, the stack-type transformer 110 may provide a transformer capacity of 50 kVA by activating only one of the two unit transformers, and may deactivate all unit transformers. In this case, the supply AC power of the stacked transformer 110 may be 50 kVA.

The multi-input switch built-in rectifier 120 receives a low voltage AC power from each unit transformer 111, 112 by using the power supply lines 151 and 152 corresponding to the unit transformers 111 and 112. The multi-input switch built-in rectifier 120 includes a plurality of switches 161 and 162, a controller 130, and a rectifier 140 that perform opening and closing operations on the respective power supply lines 151 and 152.

The controller 130 generates a control signal instructing to open / close the switches 161 and 162. Hereinafter, in the present specification, opening the switches 161 and 162 means opening the switch and manipulating the current so as not to flow, and closing the switches 161 and 162 means closing the switch and manipulating the current. .

The switches 161 and 162 perform opening / closing operations on the power supply lines 151 and 152 according to the control signal generated by the controller 130. If the specific switches 161 and 162 are opened, the unit transformers 111 and 112 corresponding to the open switches 161 and 162 are deactivated, and the transformer capacity of the stacked transformer 110 is deactivated. May be reduced by a capacity of 112). On the contrary, when the specific switches 161 and 162 are inputted, the unit transformers 111 and 112 corresponding to the input switches 161 and 162 are activated, and the transformer capacity of the stacked transformer 110 is activated. , 112).

The rectifier 140 rectifies the AC power of the low voltage generated by the unit transformers 111 and 112 to generate DC power, and supplies the generated DC power to the power equipment.

According to one side, the controller 130 may generate a control signal for each switch (161, 162) according to the DC power (power consumption for DC power) actually consumed by the power equipment.

For example, the controller 130 may generate a control signal by comparing the capacity of the direct current power with the capacity of the supply AC power of the stack-type transformer 110. According to one side, the control unit 130 predicts the capacity of the AC power supply of the stack-type transformer 110 when performing the open operation for at least one of the plurality of switches (161, 162). If the switch is opened, the unit transformer corresponding to the open switch is deactivated, so that the capacity of the AC power supply of the stacked transformer is reduced by the transformer capacity of the deactivated unit transformer. The controller 130 compares the predicted supply AC power capacity with the power consumption for the DC power, and when the predicted supply AC power capacity is larger than the DC power consumption, the opening operation for the at least one switch. The control signal may be generated to perform the operation.

According to one side, the controller 130 is at least one switch of the plurality of switches (161, 162) when the consumption capacity for the DC power is more than a predetermined ratio of the capacity of the supply AC power of the stacked transformer 110. A control signal can be generated to perform the dosing operation.

For example, if the unit transformers 111 and 112 have a capacity of 50 kVA and the stacked transformer 110 activates only one unit transformer 111 to supply AC power, the supply AC power of the stacked transformer 110 may be reduced. The capacity is 50 kVA. In this case, if the power consumption of DC power is close to 50 kVA, only one unit transformer cannot provide sufficient AC power. In this case, the controller 130 may generate a control signal to input the switch 162 corresponding to the unit transformer 112. When the unit transformer 112 is activated, the capacity of the supplied AC power of the stacked transformer 110 increases by the transformer capacity of the unit transformer 112. Therefore, it can operate more stably.

According to one side, whether the operation of each unit transformer (111, 112) is determined according to whether the switch (161, 162) corresponding to each of the unit transformer (111, 112) is open / closed. In this case, the controller 130 may generate operation history information for each unit transformer 111 and 112 based on the control signal. In addition, the controller 130 generates cumulative operation time of each unit transformer 111 and 112 by referring to operation history information of each unit transformer 111 and 112, and based on the accumulated operation time, each unit transformer 111 is generated. , 112, can be estimated for the remaining lifetime.

According to one side of the control unit 130 measures the voltage of the low voltage AC power input to the rectifier 140, and determines whether the normal operation of each unit transformer (111, 112) or overload based on the measured voltage can do.

In addition, the controller 130 may determine the aging of each unit transformer 111, 112 based on at least one of normal operation, overload, and operation history information of each unit transformer 111, 112.

According to one side, the controller 130 may set the operation priority for each unit transformer (111, 112). In this case, among the plurality of switches 161 and 162, a switch corresponding to the unit transformers 111 and 112 having a high operation priority may be preferentially input. According to one side, the controller 130 may set the highest operation priority of the unit transformer with the longest remaining lifetime among the plurality of unit transformers (111, 112).

Fig. 2 is a diagram showing the structure of a direct current supply system according to another exemplary embodiment. The DC supply system 200 illustrated in FIG. 2 includes a smart switch 210 with a built-in stack type switch and a multi-input rectifier 220.

The smart switch 210 with a built-in stack type switch includes a plurality of unit transformers 240 and 250, a controller 230, and switches 261 and 262. The smart switch 210 with a built-in stack type switch is a transformer that provides a total capacity by using a plurality of unit transformers 240 and 250. In addition, the controller 230 of the stack type built-in smart transformer 210 generates a control signal for controlling the switches 261 and 262 corresponding to the unit transformers 240 and 250.

The unit transformers 240 and 250 receive high voltage AC power and convert the AC power into low voltage AC power. The power supply lines 271 and 272 transmit the AC power of the low voltage converted by the unit transformers 240 and 250 to the multiple input rectifier 220.

The multi-input rectifier 220 rectifies the AC power of low voltage to generate DC power, and supplies the generated DC power to the power equipment.

According to one side, the controller 230 compares the power consumption of the power consumed by the power equipment with the capacity of the supply AC power of the stack-type transformer to generate a control signal instructing the opening / closing of each switch (261, 262) Can be.

For example, the controller 230 predicts the capacity of the supply AC power of the stacked transformer 210 when the opening operation of at least one switch among the plurality of switches 261 and 262 is performed. If the switch is open, the capacity of the supplied AC power of the stacked transformer is reduced. The controller 230 compares the predicted supply AC power capacity with the power consumption for the DC power, and when the predicted supply AC power capacity is larger than the DC power consumption, the opening operation for the at least one switch. The control signal may be generated to perform the operation.

Also, for example, the controller 230 may include at least one switch among the plurality of switches 261 and 262 when the power consumption of the DC power is more than a predetermined ratio of the capacity of the supplied AC power of the stacked transformer 210. A control signal can be generated to perform the input operation for the. If the power consumption of the DC power and the capacity of the supply AC power of the stacked transformer are similar, the DC supply system 200 cannot stably supply sufficient power. In this case, the controller 230 may generate a control signal such that a switch corresponding to the deactivated unit transformer is input. When switched on, the deactivated unit transformer is activated so that the supply AC power of the stacked transformer increases by the capacity of the activated unit transformer. Therefore, the DC supply system can supply AC power more stably.

According to one side, the controller 230 may generate the operation history information for each unit transformer (240, 250) based on the control signal. Since operation of each unit transformer 240 or 250 is determined according to whether each switch 261 or 262 is opened or closed, the control unit 230 indicates a control signal for instructing opening or closing of each switch 261 or 262. Based on the operation history information indicating whether the operation of the unit transformer (240, 250) in each specific time zone can be generated. According to one side, the controller 230 may generate the cumulative operating time of the unit transformer (240, 250).

According to one side, the control unit 230 may predict the remaining life of each unit transformer 240, 250 based on the cumulative operating time of each unit transformer (240, 250). According to one side, the controller 230 may set the highest operation priority for the unit transformer with the longest remaining life.

According to one side, the controller 230 may preferentially input a switch corresponding to the unit transformer having the highest operation priority. In addition, the controller 230 may preferentially open a switch corresponding to the unit transformer having the lowest operation priority.

3 is a diagram showing the structure of a DC supply system according to another exemplary embodiment. The DC supply system 300 shown in FIG. 3 includes a stacked switch-embedded smart transformer 310 and a multiple input smart rectifier 320.

According to one side, the stack type built-in smart transformer 310 includes a plurality of unit transformers 311 and 312 and switches 351 and 352 corresponding to each unit transformer 311 and 312. In addition, the multi-input smart rectifier 320 includes a rectifier 340 and the controller 330.

The unit transformers 311 and 312 receive an AC power having a high voltage and convert the AC power to generate an AC power having a low voltage. The AC power output of each unit transformer 311 and 312 is transmitted to the multi-input smart rectifier 320 using power supply lines 361 and 362 corresponding to each unit transformer 311 and 312.

The control unit 330 generates a control signal instructing the opening and closing of each power supply line (361, 362), the rectifier 340 rectifies the AC power of the low voltage generated by the unit transformer (311, 312) Generate DC power and supply the generated DC power to the power equipment.

The switches 351 and 352 perform open / close operations on the respective power supply lines 361 and 362 according to the control signal. When the switches 351 and 351 are open, the power supply lines 361 and 362 between the rectifiers 340 are disconnected from the unit transformers 311 and 312 to reduce the AC power of the low voltage transmitted to the rectifier 340. In addition, when the switches 351 and 352 are turned on, the power supply lines 361 and 362 between the unit transformers 311 and 312 are connected to the rectifiers 340 to increase AC power of low voltage transmitted to the rectifiers 340. The value of the DC power generated by the rectifier 340 is proportional to the value of the AC power of the low voltage input to the rectifier 340.

According to one side, the controller 330 may generate a control signal for each switch (351, 352) according to the consumption capacity for the DC power actually consumed by the power equipment.

For example, when the power consumption for DC power is greater than the capacity of the supply AC power of the stacked transformer 310 or the power consumption for DC power is a value similar to the capacity of the supply AC power of the stacked transformer 310. The controller 330 may generate a control signal for performing input to at least one switch so that the unit transformer included in the stacked transformer 310 is additionally activated. In addition, when the consumption capacity with respect to the DC power is more than a predetermined ratio of the capacity of the supply AC power of the stack-type transformer 310, the control unit 330 is the supply AC power with respect to the DC-type power supply (310) The control signal may be determined to be similar to the capacity of, and to perform additional input to at least one or more switches.

In addition, the controller 330 may estimate the capacity of the supplied AC power when the opening operation of at least one switch among the plurality of switches 351 and 362 is performed. When the estimated capacity of the supplied AC power is a value larger than the consumed capacity for the DC power, the controller 330 may generate a control signal to perform an opening operation on at least one switch.

  That is, the controller 330 may generate a control signal for each switch 351 and 352 such that the value of the DC power generated by the rectifier 340 matches the value of the DC current consumed by the power equipment.

According to one side, the operation of the unit transformer (311, 312) is determined according to whether the switch (351, 352) corresponding to the unit transformer (311, 312) is open / closed. According to one side, the controller 330 may generate the operation history information of each of the unit transformer (311, 312) based on a control signal indicating whether the switch (351, 352) operation. According to one side, the controller 330 may generate the cumulative operation time for each unit transformer 311, 312 based on a control signal indicating whether the switches 351, 352 to operate.

According to one side, the control unit 330 determines whether the unit transformer (311, 312) is overloaded by measuring the input voltage of the rectifier (340).

According to one side, the control unit 330 predicts the remaining life for each unit transformer (311, 312) based on the cumulative operating time for each unit transformer (311, 312) or whether each unit transformer (311, 312) is overloaded Can be performed.

According to one side, the control unit 330 may set the operation priority for each unit transformer (311, 312). The controller 330 may generate a control signal so that a switch corresponding to a unit transformer having a high operation priority is preferentially input.

According to one side, the control unit 330 may set the operation priority for each unit transformer (311, 312) to have the highest operation priority for the unit transformer with the longest remaining life.

Fig. 4 is a diagram showing the structure of a DC supply system according to another exemplary embodiment. The DC supply system 400 includes a stacked transformer 410, a multiple input rectifier 420, a controller 430, power supply lines 451 and 452, switches 441 and 442, and a temperature measuring unit 460. can do.

The stacked transformer 410 includes a plurality of unit transformers 411 and 412. The stack-type transformer 410 receives high voltage AC power and distributes the same to each unit transformer 411 and 412. Each unit transformer 411 and 412 converts high voltage AC power to generate low voltage AC power.

The power supply lines 451 and 452 transmit the low voltage AC power output for each unit transformer 411 and 412 to the multi-input rectifier 420.

The multi-input rectifier 420 receives low voltage AC power from the plurality of unit transformers 411 and 412 using the plurality of power supply lines 451 and 452, rectifies the received low voltage AC power to generate DC power. Create The multiple input rectifier 420 can supply DC power to the power equipment.

The switches 441 and 442 perform open / close operations to the respective power supply lines 451 and 452. According to one side, the switches 441 and 442 may perform an open / close operation to each of the power supply lines 451 and 452 according to a control signal.

The control unit 430 generates a control signal for instructing the open / close operation of each of the power supply lines 451 and 452. According to one side, the controller 430 may generate a control signal for each switch (441, 442) according to the consumption capacity for the DC power.

According to one side, the control unit 430 may generate a control signal by comparing the power consumption of the DC power and the capacity of the AC power supplied by the stack-type transformer 410.

For example, the controller 430 may estimate the capacity of the AC power supplied by the stack-type transformer 410 when an open operation is performed on at least one of the switches 441 and 442. Can be. When the estimated AC power capacity is larger than the power consumption for DC power, the controller 430 may generate a control signal to perform an opening operation on the switch 441.

In addition, the controller 430 may determine that the power consumption of the DC power is greater than that of the supply AC power of the stack-type transformer 410, or if the two values are in a similar range, at least one of the plurality of switches. The control signal may be generated to perform an input operation to the switch 441. When the switch 441 is additionally input, since the unit transformer 411 corresponding to the input switch 441 is additionally activated, the capacity of the supplied AC power of the stacked transformer 410 is increased. Therefore, the stack-type transformer 410 can supply AC power more stably.

According to one side, the temperature measuring unit 460 measures the temperature for each unit transformer (411, 412), the control unit 430 according to the measured temperature or whether the failure of each unit transformer (411, 412) or overload It can be determined. In addition, the controller 430 may generate a control signal according to the measured temperature. For example, if the measured temperature is greater than or equal to the reference value, the controller 430 may determine that the corresponding unit transformer is overheated due to a failure. Alternatively, the controller 430 may determine that the unit transformer is in an overloaded state. In this case, the controller 430 may generate a control signal for opening a switch corresponding to the corresponding unit transformer. When the switch is opened, the operation of the unit transformer corresponding to the switch may be stopped and the overload condition may be released.

According to one side, whether the operation of each unit transformer 411, 412 is determined according to whether the switch (441, 442) corresponding to each of the unit transformer (411, 412) is open / closed. Accordingly, the controller 430 may generate operation history information for each unit transformer 411 and 412 based on the control signal.

According to one side, the control unit 430 generates the cumulative operation time of each unit transformer 411, 412 with reference to the operation history information for each unit transformer (411, 412), each unit transformer based on the cumulative operation time The remaining lifetime for 411, 412 can be predicted.

According to one side, the controller 430 may set the operation priority for each unit transformer (411, 412). In this case, among the plurality of switches 441 and 442, a switch corresponding to the unit transformers 411 and 412 having a high operation priority may be preferentially input. According to one side, the control unit 430 may set the highest operation priority of the unit transformer with the longest remaining lifetime among the plurality of unit transformers (411, 412).

1 is a diagram illustrating a structure of a DC supply system according to an exemplary embodiment.
The DC supply system 100 shown in FIG. 1 includes a stacked transformer 110 and a multi-input switch built-in rectifier 120. Stacked transformer 110 is a transformer that provides a total capacity, including a plurality of unit transformer (111, 112). For example, the stacked transformer 110 may provide a total capacity of 100 kVA using two 50 kVA unit transformers 111 and 112, or may provide a total capacity of 200 kVA using four 50 kVA dml unit transformers. In FIG. 1, an embodiment in which the stacked transformer 110 includes two unit transformers 111 and 112 is illustrated, but according to another exemplary embodiment, two or more transformers may also be included.
The stack-type transformer 110 receives an AC power of a high voltage and converts it to generate an AC power of a low voltage. The stacked transformer 110 may provide a separate AC power output for each unit transformer 111 and 112. The AC power output for each unit transformer 111 and 112 is transmitted to the multi-input type switch rectifier 120 using the power supply lines 151 and 152 corresponding to the unit transformers 111 and 112.
According to one side, the stack-type transformer 110 may transform the current by operating only a part of the unit transformer (111, 112). For example, when the transformer capacity of each of the unit transformers 111 and 112 is 50 kVA, the stacked transformer 110 may provide a transformer capacity of 100 kVA using two unit transformers. In this case, the transformation capacity of 100 kVA provided by the stacked transformer 110 may be referred to as supply AC power of the stacked transformer 110.
In addition, the stack-type transformer 110 may provide a transformer capacity of 50 kVA by activating only one of the two unit transformers, and may deactivate all unit transformers. In this case, the supply AC power of the stacked transformer 110 may be 50 kVA.
The multi-input switch built-in rectifier 120 receives a low voltage AC power from each unit transformer 111, 112 by using the power supply lines 151 and 152 corresponding to the unit transformers 111 and 112. The multi-input switch built-in rectifier 120 includes a plurality of switches 161 and 162, a controller 130, and a rectifier 140 that perform opening and closing operations on the respective power supply lines 151 and 152.
The controller 130 generates a control signal instructing to open / close the switches 161 and 162. Hereinafter, in the present specification, opening the switches 161 and 162 means opening the switch and manipulating the current so as not to flow, and closing the switches 161 and 162 means closing the switch and manipulating the current. .
The switches 161 and 162 perform opening / closing operations on the power supply lines 151 and 152 according to the control signal generated by the controller 130. If the specific switches 161 and 162 are opened, the unit transformers 111 and 112 corresponding to the open switches 161 and 162 are deactivated, and the transformer capacity of the stacked transformer 110 is deactivated. May be reduced by a capacity of 112). On the contrary, when the specific switches 161 and 162 are inputted, the unit transformers 111 and 112 corresponding to the input switches 161 and 162 are activated, and the transformer capacity of the stacked transformer 110 is activated. , 112).
The rectifier 140 rectifies the AC power of the low voltage generated by the unit transformers 111 and 112 to generate DC power, and supplies the generated DC power to the power equipment.
According to one side, the controller 130 may generate a control signal for each switch (161, 162) according to the DC power (power consumption for DC power) actually consumed by the power equipment.
For example, the controller 130 may generate a control signal by comparing the capacity of the direct current power with the capacity of the supply AC power of the stack-type transformer 110. According to one side, the control unit 130 predicts the capacity of the AC power supply of the stack-type transformer 110 when performing the open operation for at least one of the plurality of switches (161, 162). If the switch is opened, the unit transformer corresponding to the open switch is deactivated, so that the capacity of the AC power supply of the stacked transformer is reduced by the transformer capacity of the deactivated unit transformer. The controller 130 compares the predicted supply AC power capacity with the power consumption for the DC power, and when the predicted supply AC power capacity is larger than the DC power consumption, the opening operation for the at least one switch. The control signal may be generated to perform the operation.
According to one side, the controller 130 is at least one switch of the plurality of switches (161, 162) when the consumption capacity for the DC power is more than a predetermined ratio of the capacity of the supply AC power of the stack-type transformer (110). A control signal can be generated to perform the dosing operation.
For example, if the unit transformers 111 and 112 have a capacity of 50 kVA and the stacked transformer 110 activates only one unit transformer 111 to supply AC power, the supply AC power of the stacked transformer 110 may be reduced. The capacity is 50 kVA. In this case, if the power consumption of DC power is close to 50 kVA, only one unit transformer cannot provide sufficient AC power. In this case, the controller 130 may generate a control signal to input the switch 162 corresponding to the unit transformer 112. When the unit transformer 112 is activated, the capacity of the supplied AC power of the stacked transformer 110 increases by the transformer capacity of the unit transformer 112. Therefore, it can operate more stably.
According to one side, whether the operation of each unit transformer (111, 112) is determined according to whether the switch (161, 162) corresponding to each of the unit transformer (111, 112) is open / closed. In this case, the controller 130 may generate operation history information for each unit transformer 111 and 112 based on the control signal. In addition, the controller 130 generates cumulative operation time of each unit transformer 111 and 112 by referring to operation history information of each unit transformer 111 and 112, and based on the accumulated operation time, each unit transformer 111 is generated. , 112, can be estimated for the remaining lifetime.
According to one side of the control unit 130 measures the voltage of the low voltage AC power input to the rectifier 140, and determines whether the normal operation of each unit transformer (111, 112) or overload based on the measured voltage can do.
In addition, the controller 130 may determine the aging of each unit transformer 111, 112 based on at least one of normal operation, overload, and operation history information of each unit transformer 111, 112.
According to one side, the controller 130 may set the operation priority for each unit transformer (111, 112). In this case, among the plurality of switches 161 and 162, a switch corresponding to the unit transformers 111 and 112 having a high operation priority may be preferentially input. According to one side, the controller 130 may set the highest operation priority of the unit transformer with the longest remaining lifetime among the plurality of unit transformers (111, 112).
Fig. 2 is a diagram showing the structure of a direct current supply system according to another exemplary embodiment. The DC supply system 200 illustrated in FIG. 2 includes a smart switch 210 with a built-in stack type switch and a multi-input rectifier 220.
The smart switch 210 with a built-in stack type switch includes a plurality of unit transformers 240 and 250, a controller 230, and switches 261 and 262. The smart switch 210 with a built-in stack type switch is a transformer that provides a total capacity by using a plurality of unit transformers 240 and 250. In addition, the controller 230 of the stack type built-in smart transformer 210 generates a control signal for controlling the switches 261 and 262 corresponding to the unit transformers 240 and 250.
The unit transformers 240 and 250 receive high voltage AC power and convert the AC power into low voltage AC power. The power supply lines 271 and 272 transmit the AC power of the low voltage converted by the unit transformers 240 and 250 to the multiple input rectifier 220.
The multi-input rectifier 220 rectifies the AC power of low voltage to generate DC power, and supplies the generated DC power to the power equipment.
According to one side, the controller 230 compares the power consumption of the power consumed by the power equipment with the capacity of the supply AC power of the stack-type transformer to generate a control signal instructing the opening / closing of each switch (261, 262) Can be.
For example, the controller 230 predicts the capacity of the supply AC power of the stacked transformer 210 when the opening operation of at least one switch among the plurality of switches 261 and 262 is performed. If the switch is open, the capacity of the supplied AC power of the stacked transformer is reduced. The controller 230 compares the predicted supply AC power capacity with the power consumption for the DC power, and when the predicted supply AC power capacity is larger than the DC power consumption, the opening operation for the at least one switch. The control signal may be generated to perform the operation.
Also, for example, the controller 230 may include at least one switch among the plurality of switches 261 and 262 when the power consumption of the DC power is more than a predetermined ratio of the capacity of the supplied AC power of the stacked transformer 210. A control signal can be generated to perform the input operation for the. If the power consumption of the DC power and the capacity of the supply AC power of the stacked transformer are similar, the DC supply system 200 cannot stably supply sufficient power. In this case, the controller 230 may generate a control signal such that a switch corresponding to the deactivated unit transformer is input. When switched on, the deactivated unit transformer is activated so that the supply AC power of the stacked transformer increases by the capacity of the activated unit transformer. Therefore, the DC supply system can supply AC power more stably.
According to one side, the controller 230 may generate the operation history information for each unit transformer (240, 250) based on the control signal. Since operation of each unit transformer 240 or 250 is determined according to whether each switch 261 or 262 is opened or closed, the control unit 230 indicates a control signal for instructing opening or closing of each switch 261 or 262. Based on the operation history information indicating whether the operation of the unit transformer (240, 250) in each specific time zone can be generated. According to one side, the controller 230 may generate the cumulative operating time of the unit transformer (240, 250).
According to one side, the control unit 230 may predict the remaining life of each unit transformer 240, 250 based on the cumulative operating time of each unit transformer (240, 250). According to one side, the controller 230 may set the highest operation priority for the unit transformer with the longest remaining life.
According to one side, the controller 230 may preferentially input a switch corresponding to the unit transformer having the highest operation priority. In addition, the controller 230 may preferentially open a switch corresponding to the unit transformer having the lowest operation priority.
3 is a diagram showing the structure of a DC supply system according to another exemplary embodiment. The DC supply system 300 shown in FIG. 3 includes a stacked switch-embedded smart transformer 310 and a multiple input smart rectifier 320.
According to one side, the stack type built-in smart transformer 310 includes a plurality of unit transformers 311 and 312 and switches 351 and 352 corresponding to each unit transformer 311 and 312. In addition, the multi-input smart rectifier 320 includes a rectifier 340 and the controller 330.
The unit transformers 311 and 312 receive an AC power having a high voltage and convert the AC power to generate an AC power having a low voltage. The AC power output of each unit transformer 311 and 312 is transmitted to the multi-input smart rectifier 320 using power supply lines 361 and 362 corresponding to each unit transformer 311 and 312.
The control unit 330 generates a control signal instructing the opening and closing of each power supply line (361, 362), the rectifier 340 rectifies the AC power of the low voltage generated by the unit transformer (311, 312) Generate DC power and supply the generated DC power to the power equipment.
The switches 351 and 352 perform open / close operations on the respective power supply lines 361 and 362 according to the control signal. When the switches 351 and 351 are open, the power supply lines 361 and 362 between the rectifiers 340 are disconnected from the unit transformers 311 and 312 to reduce the AC power of the low voltage transmitted to the rectifier 340. In addition, when the switches 351 and 352 are turned on, the power supply lines 361 and 362 between the unit transformers 311 and 312 are connected to the rectifiers 340 to increase AC power of low voltage transmitted to the rectifiers 340. The value of the DC power generated by the rectifier 340 is proportional to the value of the AC power of the low voltage input to the rectifier 340.
According to one side, the controller 330 may generate a control signal for each switch (351, 352) according to the consumption capacity for the DC power actually consumed by the power equipment.
For example, when the power consumption for DC power is greater than the capacity of the supply AC power of the stacked transformer 310 or the power consumption for DC power is a value similar to the capacity of the supply AC power of the stacked transformer 310. The controller 330 may generate a control signal for performing input to at least one switch so that the unit transformer included in the stacked transformer 310 is additionally activated. In addition, when the consumption capacity with respect to the DC power is more than a predetermined ratio of the capacity of the supply AC power of the stack-type transformer 310, the control unit 330 is the supply AC power with respect to the DC-type power supply (310) The control signal may be determined to be similar to the capacity of, and to perform additional input to at least one or more switches.
In addition, the controller 330 may estimate the capacity of the supplied AC power when the opening operation of at least one switch among the plurality of switches 351 and 362 is performed. When the estimated capacity of the supplied AC power is a value larger than the consumed capacity for the DC power, the controller 330 may generate a control signal to perform an opening operation on at least one switch.
That is, the controller 330 may generate a control signal for each switch 351 and 352 such that the value of the DC power generated by the rectifier 340 matches the value of the DC current consumed by the power equipment.
According to one side, the operation of the unit transformer (311, 312) is determined according to whether the switch (351, 352) corresponding to the unit transformer (311, 312) is open / closed. According to one side, the controller 330 may generate the operation history information of each of the unit transformer (311, 312) based on a control signal indicating whether the switch (351, 352) operation. According to one side, the controller 330 may generate the cumulative operation time for each unit transformer 311, 312 based on a control signal indicating whether the switches 351, 352 to operate.
According to one side, the control unit 330 determines whether the unit transformer (311, 312) is overloaded by measuring the input voltage of the rectifier (340).
According to one side, the control unit 330 predicts the remaining life for each unit transformer (311, 312) based on the cumulative operating time for each unit transformer (311, 312) or whether each unit transformer (311, 312) is overloaded Can be performed.
According to one side, the control unit 330 may set the operation priority for each unit transformer (311, 312). The controller 330 may generate a control signal so that a switch corresponding to a unit transformer having a high operation priority is preferentially input.
According to one side, the control unit 330 may set the operation priority for each unit transformer (311, 312) to have the highest operation priority for the unit transformer with the longest remaining life.
Fig. 4 is a diagram showing the structure of a DC supply system according to another exemplary embodiment. The DC supply system 400 includes a stacked transformer 410, a multiple input rectifier 420, a controller 430, power supply lines 451 and 452, switches 441 and 442, and a temperature measuring unit 460. can do.
The stacked transformer 410 includes a plurality of unit transformers 411 and 412. The stack-type transformer 410 receives high voltage AC power and distributes the same to each unit transformer 411 and 412. Each unit transformer 411 and 412 converts high voltage AC power to generate low voltage AC power.
The power supply lines 451 and 452 transmit the low voltage AC power output for each unit transformer 411 and 412 to the multi-input rectifier 420.
The multi-input rectifier 420 receives low voltage AC power from the plurality of unit transformers 411 and 412 using the plurality of power supply lines 451 and 452, rectifies the received low voltage AC power to generate DC power. Create The multiple input rectifier 420 can supply DC power to the power equipment.
The switches 441 and 442 perform open / close operations to the respective power supply lines 451 and 452. According to one side, the switches 441 and 442 may perform an open / close operation to each of the power supply lines 451 and 452 according to a control signal.
The control unit 430 generates a control signal for instructing the open / close operation of each of the power supply lines 451 and 452. According to one side, the controller 430 may generate a control signal for each switch (441, 442) according to the consumption capacity for the DC power.
According to one side, the control unit 430 may generate a control signal by comparing the power consumption of the DC power and the capacity of the AC power supplied by the stack-type transformer 410.
For example, the controller 430 may estimate the capacity of the AC power supplied by the stack-type transformer 410 when an open operation is performed on at least one of the switches 441 and 442. Can be. When the estimated AC power capacity is larger than the power consumption for DC power, the controller 430 may generate a control signal to perform an opening operation on the switch 441.
In addition, the controller 430 may determine that the power consumption of the DC power is greater than that of the supply AC power of the stack-type transformer 410, or if the two values are in a similar range, at least one of the plurality of switches. The control signal may be generated to perform an input operation to the switch 441. When the switch 441 is additionally input, since the unit transformer 411 corresponding to the input switch 441 is additionally activated, the capacity of the supplied AC power of the stacked transformer 410 is increased. Therefore, the stack-type transformer 410 can supply AC power more stably.
According to one side, the temperature measuring unit 460 measures the temperature for each unit transformer (411, 412), the control unit 430 according to the measured temperature or whether the failure of each unit transformer (411, 412) or overload It can be determined. In addition, the controller 430 may generate a control signal according to the measured temperature. For example, if the measured temperature is greater than or equal to the reference value, the controller 430 may determine that the corresponding unit transformer is overheated due to a failure. Alternatively, the controller 430 may determine that the unit transformer is in an overloaded state. In this case, the controller 430 may generate a control signal for opening a switch corresponding to the corresponding unit transformer. When the switch is opened, the operation of the unit transformer corresponding to the switch may be stopped and the overload condition may be released.
According to one side, whether the operation of each unit transformer 411, 412 is determined according to whether the switch (441, 442) corresponding to each of the unit transformer (411, 412) is open / closed. Accordingly, the controller 430 may generate operation history information for each unit transformer 411 and 412 based on the control signal.
According to one side, the control unit 430 generates the cumulative operation time of each unit transformer 411, 412 with reference to the operation history information for each unit transformer (411, 412), each unit transformer based on the cumulative operation time The remaining lifetime for 411, 412 can be predicted.
According to one side, the controller 430 may set the operation priority for each unit transformer (411, 412). In this case, among the plurality of switches 441 and 442, a switch corresponding to the unit transformers 411 and 412 having a high operation priority may be preferentially input. According to one side, the control unit 430 may set the highest operation priority of the unit transformer with the longest remaining lifetime among the plurality of unit transformers (411, 412).

Claims (15)

A stacked transformer including a plurality of unit transformers;
A multi-input rectifier for receiving AC power from the stack-type transformer using a power supply line corresponding to each of the unit transformers, and rectifying the received AC power to generate DC power; And
A plurality of switches for performing opening and closing operations on each of the power supply lines;
DC supply system comprising a. The method of claim 1,
A control unit for generating a control signal for each switch in accordance with the consumption capacity for the DC power
Further comprising:
And the switches perform an opening and closing operation on each of the power supply lines in accordance with a control signal for each switch. The method of claim 2,
And the control unit generates the control signal by comparing the capacity of the direct current power with the capacity of the supply AC power of the stack-type transformer. The method of claim 3,
The control unit predicts the capacity of the AC power when the opening operation is performed on at least one switch among the plurality of switches, and the capacity of the predicted AC power is larger than the consumption capacity of the DC power. And, generating the control signal to perform the opening operation. The method of claim 3,
The control unit is configured to generate the control signal to perform the input operation on at least one switch among the plurality of switches when the consumption capacity with respect to the DC power is more than a predetermined ratio of the capacity of the supplied AC power. . The method of claim 2,
The control unit is a DC supply system for generating the operation history information of each unit transformer based on the control signal. The method of claim 6,
The control unit is a DC supply system for performing a life prediction for each unit transformer based on the operation history information. The method of claim 2,
The control unit sets an operation priority for each unit transformer, and generates the control signal according to the operation priority. The method of claim 2,
Temperature measuring unit for measuring the temperature of each unit transformer
Further comprising:
The control unit is a DC supply system for generating the control signal in accordance with the measured temperature of each unit transformer. A stack-type transformer including a first unit transformer configured to receive AC power and generate a first power converted into voltage, and a second unit transformer configured to receive AC power and generate a second converted power;
A multiple input rectifier for rectifying the first power and the second power into direct current power;
A first power supply line transmitting the first power from the first unit transformer to the multi-input rectifier and a second power supply line transmitting the second power from the second unit transformer to the multi-input rectifier;
A first switch performing an open / close operation on the first power supply line and a second switch performing an open / close operation on the second power supply line; And
A controller configured to generate a control signal instructing to open and close the first switch and the second switch;
DC supply system comprising a. The method of claim 10,
The control unit predicts the capacity of the supplied AC power of the stack-type transformer when the opening operation of at least one switch among the plurality of switches is performed, and the estimated capacity of the AC power consumes the DC power. And if greater than the capacity, generate the control signal to perform the opening operation. The method of claim 10,
The control unit is configured to generate the control signal to perform the input operation on at least one switch among the plurality of switches when the consumption capacity with respect to the DC power is more than a predetermined ratio of the capacity of the supplied AC power. . The method of claim 10,
The control unit is a DC supply system for generating the operation history information of the first unit transformer or the second unit transformer based on the control signal. The method of claim 13,
The control unit is a DC supply system for performing a life prediction for the first unit transformer or the second unit transformer based on the operation history information. The method of claim 10,
And the control unit sets an operation priority of the first unit transformer or the second unit transformer and generates the control signal according to the operation priority.

Images