KR101246048B1 - System for uninterruptible power supply - Google Patents

Abstract

The present invention relates to an uninterruptible power supply system.
For example, an uninterruptible power supply unit including a battery unit, a battery charging circuit unit for charging the battery unit with an external input power source, a rectifier unit for rectifying the external input power source, and an inverter unit for converting the power rectified by the rectifier unit into AC power; A first switch connected in series to the uninterruptible power supply; A variable impedance unit connected in parallel to the uninterruptible power supply unit and the first switch; A second switch connected in parallel to the uninterruptible power supply unit and the first switch and connected in series with the variable impedance unit; A third switch connected between an uninterruptible power supply unit and a connection node of the variable impedance unit and an external input power source; And a control unit controlling an impedance of the variable impedance unit and controlling the first switch to the third switch so that power is continuously supplied to the load unit, wherein the control unit is configured to set a peak power usage time period. The present invention discloses an uninterruptible power supply system for controlling the first switch to the third switch so that external input power is cut off at a set power usage peak time and power is supplied to the load unit.

Description

Uninterruptible Power Supply System {SYSTEM FOR UNINTERRUPTIBLE POWER SUPPLY}

The present invention relates to an uninterruptible power supply system.

The uninterruptible power supply is a device for supplying high-quality power without interruption when there is a power failure such as power failure, instantaneous voltage and frequency fluctuation of commercial power. Such uninterruptible power supplies can be classified into online and offline methods.

The conventional offline uninterruptible power supply is composed of a charging unit, a battery unit, an inverter and a bypass line. Such a conventional offline uninterruptible power supply normally supplies power to load commercial power through a bypass line. In the conventional offline UPS, the switching switch is switched from the bypass line to the inverter unit during a power failure. Then, the charging unit supplies the DC power DC charged in the battery unit to the AC power supply AC by loading the inverter unit. However, the conventional off-line uninterruptible power supply has a problem in that the mode switching of the uninterruptible power supply from normal to power failure, that is, the control of the switching switch takes a long time, so that the power supply is disconnected. In addition, the conventional off-line uninterruptible power supply has irregular output power, and therefore, its use is not suitable for precision equipment requiring a stable output voltage and frequency.

The conventional online uninterruptible power supply is composed of a rectifier, a charging unit, a switching switch, a battery unit, an inverter unit, a bypass line, and a bypass switch. In the conventional online uninterruptible power supply, the bypass switch is normally opened, and the switching switch is connected between the charging unit and the battery unit, so that the rectifying unit, the inverter unit, and the charging unit are always operated. In addition, since the conventional online uninterruptible power supply is a state in which commercial power cannot be supplied during a power failure, the rectifying unit and the charging unit do not operate, and the switching switch connects the inverter unit and the battery unit to operate the battery unit and the inverter unit. Supply power to the load. However, in the conventional online uninterruptible power supply, there is a problem that 100% of commercial power is normally supplied to the load device through the uninterruptible power supply, so that the loss in the uninterruptible power supply must be considered.

In addition, the conventional uninterruptible power supply does not control the input signal to the output signal 1: 1, and therefore, an output transformer is required. However, the output stage transformer causes an increase in the conduction current of the switch due to power loss and a low DC voltage, thereby reducing the efficiency of the overall system.

On the other hand, during peak hours of power consumption, which consumes the most power, the power plant may be overloaded, resulting in fire and power outages. In addition, when the capacity of the faucet exceeds capacity, the insufficient power affects the power quality by drawing power from the adjacent area. This may cause malfunction of the digital device and shorten the life of the device. In old wood condition, it may cause property damage and injury such as fire due to overheating, explosion of old power distribution equipment and fire.

The present invention provides a more stable and economical power operation and provides a high efficiency, high power factor and miniaturized uninterruptible power supply system.

Uninterruptible power supply system according to an embodiment of the present invention, a battery unit, a battery charging circuit unit for charging the battery unit with an external input power, a rectifier for rectifying the external input power and the power rectified in the rectifier is converted into AC power An uninterruptible power supply unit including an inverter unit; A first switch connected in series to the uninterruptible power supply; A variable impedance unit connected in parallel to the uninterruptible power supply unit and the first switch; A second switch connected in parallel to the uninterruptible power supply unit and the first switch and connected in series with the variable impedance unit; A third switch connected between an uninterruptible power supply unit and a connection node of the variable impedance unit and an external input power source; And a control unit controlling an impedance of the variable impedance unit and controlling the first switch to the third switch so that power is continuously supplied to the load unit, wherein the control unit is configured to set a peak power usage time period. The controller controls the first switch to the third switch so that external input power is cut off at a set peak power usage time and power is supplied to the load unit.

In addition, the uninterruptible power supply unit may include a fuse unit for protecting the uninterruptible power supply unit; And an LC filter unit connected to an output terminal of the inverter unit and serving as an output filter. The reactor unit may further include a reactor unit for preventing a sudden change in the AC current at the output terminal.

In addition, the inverter unit may operate in an instantaneous voltage control method by the IGBT.

The control unit may include: a switch control unit controlling the first switch to the third switch; An input terminal measuring unit measuring an input terminal voltage, a current, and a phase of the uninterruptible power supply unit and the variable impedance unit; An output stage measuring unit measuring voltage, current, and phase of an output terminal of the uninterruptible power supply unit and the variable impedance unit; A variable impedance controller configured to change an impedance value of the variable impedance based on the values measured by the input terminal measuring unit and the output terminal measuring unit; A PLL circuit unit generating a signal for synchronizing an input terminal signal and an output terminal signal of the uninterruptible power supply unit; An inverter controller which controls the inverter unit based on the signal of the PLL circuit unit; A time setting unit for setting a peak power use time zone; And it may include a safety device for detecting the current flow of the uninterruptible power supply unit to determine the abnormality of the uninterruptible power supply.

The apparatus may further include a detector configured to detect respective amounts of current output from the uninterruptible power supply unit and the variable impedance unit.

The variable impedance controller may be configured to adjust the amount of current flowing through the uninterruptible power supply unit and the variable impedance unit based on a value measured by the input terminal measuring unit and the output terminal measuring unit and a value detected by the detecting unit. The charge amount of the battery unit may be adjusted by controlling the impedance of the variable impedance unit.

The time setting unit may adjust the total time of the self-power-use time zone based on the charge amount of the battery unit.

The variable impedance controller may control the variable impedance unit to have the same impedance as that of the uninterruptible power supply unit.

In addition, in the time setting unit, the peak power time zone may be set by at least one of an input method and a direct input using wireless communication in an external system.

The apparatus may further include a wireless communication unit configured to receive a wireless control signal including information on the self-power-use time zone from an external system, transmit the wireless control signal to the time setting unit, and transmit the detected information to the external system through the control unit. .

The self-power time zone may be set to at least one time zone of the peak power use time zone and the use time zone according to the electric charge differential.

The controller may control the first switch to the third switch according to a normal mode, a power failure mode, a self power providing mode, and an apparatus abnormality mode.

The controller may turn on the first switch to the third switch in the normal mode to allow external input power to be delivered to the load through the uninterruptible power supply and the variable impedance unit.

In addition, the controller may turn on the first switch and turn off the second switch in the power failure mode, such that the power of the battery unit is supplied to the load.

The controller may be configured to turn on the first switch and the third switch and turn off the second switch in the self-power providing mode to supply power to the battery unit during a set peak power usage time. Can be.

The control unit may turn off the first switch and turn on the second switch and the third switch in the device abnormal mode so that external input power is delivered to the load unit through the variable impedance unit.

According to the present invention, it is possible to provide a more stable and economical power operation and to provide a high efficiency, high power factor and miniaturized uninterruptible power supply system.

1 is a block diagram showing the configuration of an uninterruptible power supply system according to an embodiment of the present invention.
2A is a diagram illustrating an operation in a normal mode of an uninterruptible power supply system according to an embodiment of the present invention.
2B is a diagram illustrating an operation in an electrostatic mode of an uninterruptible power supply system according to an embodiment of the present invention.
2C is a diagram illustrating an operation in a self power providing mode of an uninterruptible power supply system according to an embodiment of the present invention.
FIG. 2D is a diagram illustrating an operation in an apparatus abnormal mode of the uninterruptible power supply system according to an exemplary embodiment of the present invention.
3 is a block diagram showing in more detail the configuration of the uninterruptible power supply unit according to an embodiment of the present invention.
4 is a block diagram illustrating a circuit diagram of an uninterruptible power supply unit and an operation of the controller according to an embodiment of the present invention.
5 is a circuit diagram illustrating an embodiment of the safety device of FIG. 4.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

1 is a block diagram illustrating a configuration of an uninterruptible power supply system 100 according to an embodiment of the present invention.

Referring to FIG. 1, an uninterruptible power supply system 100 according to an embodiment of the present invention includes an input filter unit 110, an uninterruptible power supply unit 120, a first switch SW1, and a variable impedance unit 130. , A second switch SW2, a third switch SW3, a controller 140, a wireless communication unit 150, and a detection unit 160. In addition, by the above configurations, the uninterruptible power supply system 100 according to the present invention can operate in a normal mode, a power failure mode, a self-power supply mode and a device abnormal mode.

The input filter unit 110 is connected to the commercial power source 1 side. The input filter unit 110 filters electrical noise of a commercial power source 1, that is, an AC power source.

The uninterruptible power supply unit 120 is connected to the commercial power source 1 side. The uninterruptible power supply unit 120 may receive power passing through the input filter unit 110. In addition, the uninterruptible power supply unit 120 is connected in series with the first switch SW1. Here, the first switch SW1 is controlled by the controller 140 on / off operation. The uninterruptible power supply unit 120 is a device for supplying power to the load device 6 at the time of occurrence of an abnormality in the commercial power source 1 or a preset self-power use time, which will be described later.

The variable impedance unit 130 is connected to the uninterruptible power supply unit 120 and the first switch SW1 in parallel. In addition, a second switch SW2 is connected in series to the variable impedance unit 130. Here, the second switch SW2 is controlled by the controller 140 on / off operation. The variable impedance unit 130 is controlled to the same impedance as the uninterruptible power supply unit 120 by the control unit 140.

The third switch SW3 is electrically connected between the uninterruptible power supply unit 120 and the connection node A of the variable impedance unit 130 and the input filter unit 110.

The controller 140 controls the impedance of the variable impedance unit 130 to be the same impedance as the uninterruptible power supply unit 120. In addition, the controller 140 controls the first to third switches SW1, SW2, and SW3 according to the normal mode, the power failure mode, the self power supply mode, and the device abnormality mode of the uninterruptible power supply system 100.

The wireless communication unit 150 receives a wireless control signal including information on the self-power time zone from an external system and transmits the wireless control signal to the time setting unit 148 of the control unit 140 to be described later, and the control unit 140 ) Transmits the detected information to the external system.

The detector 160 may detect an amount of current output from the variable impedance unit 130, and may also detect an amount of current output from the uninterruptible power supply unit 120.

Hereinafter, an operation of the uninterruptible power supply system 100 for each mode according to the control of the first switch SW1 to the third switch SW3 of the controller 140 will be described with reference to FIGS. 2A to 2D.

2A is a diagram illustrating an operation in the normal mode of the uninterruptible power supply system 100. 2B is a diagram illustrating an operation in the power failure mode of the uninterruptible power supply system 100. 2C is a diagram illustrating an operation in a self-power providing mode of the uninterruptible power supply system 100. FIG. 2D is a diagram illustrating an operation in a device abnormal mode of the uninterruptible power supply system 100.

Table 1 below shows an operation state of each mode of the first to third switches SW1, SW2, and SW3 under the control of the controller 140.

Flat mode Power failure mode Self power
Offer mode Device anomaly mode SW1 On On On Off SW2 On Off Off On SW3 On - Off On

The normal mode is a mode when both the commercial power supply 1 and the uninterruptible power supply unit 120 operate without abnormality. In the normal mode, as shown in FIG. 2A, all of the first to third switches SW1, SW2, and SW3 are turned on under the control of the controller 140. Accordingly, the commercial power supply 1 is delivered to the load device 6 via the uninterruptible power supply unit 120 and the variable impedance unit 130. In this case, since the impedance of the uninterruptible power supply unit 120 and the variable impedance unit 130 remains the same, the currents Ia and Ib flowing through the same are the same. The current Ic delivered to the load device 6 is the sum of the current Ia passing through the uninterruptible power supply unit 120 and the current Ib passing through the variable impedance unit 130. On the other hand, in the normal mode, the battery unit 127 of the uninterruptible power supply unit 120 to be described later may be charged with power by the current Ia flowing through the uninterruptible power supply unit 120.

The power failure mode is a mode when the uninterruptible power supply unit 120 is normal and the commercial power source 1 is not supplied. In the power failure mode, as shown in FIG. 2B, under the control of the controller 140, the first switch SW1 is turned on and the second switch SW2 is turned off. At this time, since the commercial power source 1 is not supplied, the state of the third switch SW3 does not affect the power failure mode operation. In the power failure mode, the power stored in the battery unit 127 of the uninterruptible power supply unit 120 may be supplied to the load device 6. As a result, the load device 6 may receive a continuous supply of power even during a power failure.

In the self-power supply mode, both the commercial power source 1 and the uninterruptible power supply 120 are in a normal state, but cut off the power input from the commercial power source 1 during the self-use time set in advance in the controller 140. And it is a mode for supplying its own power from the battery unit 127 of the uninterruptible power supply 120 to the load device (6). In the self-power providing mode, as illustrated in FIG. 2C, the first switch SW1 is turned on by the controller 140, and the second and third switches SW2 and SW3 are turned off. Accordingly, the power stored in the battery unit of the uninterruptible power supply unit 120 may be supplied to the load device 6 during the self power use time set in the controller 140. Here, the self-power usage time zone may be set to a peak power usage time zone or a usage time zone according to the electric charge differential system, which will be described later.

The device error mode is an operation mode when the commercial power source 1 is normally supplied and an error occurs in the uninterruptible power supply unit 120. In the device abnormal mode, as illustrated in FIG. 2D, the first switch SW1 is turned off and the second and third switches SW2 and SW3 are turned on by the control of the controller 140. Accordingly, the commercial power source 1 is transmitted to the load device 6 via the variable impedance unit 130.

As described above, it is possible to control the first switch SW1 and the second switch SW2 connected in parallel by the control of the controller 140, so that there is no transfer time when switching modes, It is possible to reduce the overload of the faucet facility by controlling the automatic use of its own power in the use time according to the electricity rate differential system (time of low use rate), which is stable and economical effect of reducing the electric charge. Detailed configuration and operation of the controller 140 will be described later.

Hereinafter, the configuration and operation of the uninterruptible power supply unit 120 according to an embodiment of the present invention will be described in detail.

3 is a block diagram illustrating the configuration of the uninterruptible power supply unit 120 according to an embodiment of the present invention in more detail.

Referring to FIG. 3, the uninterruptible power supply unit 120 includes a rectifying unit 122, an inverter unit 123, a battery charging circuit unit 126, and a battery unit 127. In addition, the uninterruptible power supply unit 120 may further include a fuse unit 121, an LC filter unit 124, and a reactor unit 125.

The fuse unit 121 may include a fuse. When the abnormality occurs in the uninterruptible power supply unit 120, the fuse unit 121 may be disconnected so that power is no longer supplied to the uninterruptible power supply unit 120.

The rectifier 122 rectifies the input AC commercial power into a DC power source.

The inverter unit 123 converts the DC power passed through the rectifying unit 122 into AC power in the normal mode. In addition, in the power failure mode, the inverter unit 123 converts the DC power accumulated in the battery unit 127 into AC power and transfers it to the load device.

The LC filter unit 124 may be connected between the inverter unit 123 and the load device 6. In addition, the LC filter unit 124 removes noise of the power supply passing through the inverter unit 123.

The reactor unit 125 may be connected between the inverter unit 123 and the load device 6. Reactor unit 125 may be made of a reactor having a large inductive reactance. The reactor unit 125 is for canceling a sudden change in the output terminal current, and may be particularly useful when the uninterruptible power supply unit 120 is connected in parallel in a modular form.

The battery charging circuit unit 126 may be connected between the commercial power source and the battery unit 127. In addition, the battery charging circuit unit 126 is a circuit for charging the commercial power source 1 to the battery unit 127 in preparation for supply interruption of the commercial power source 1 or supply power to be used in the period of use of its own power.

The battery unit 127 may be composed of a plurality of batteries. In addition, the battery unit 127 is charged with power through the battery charging circuit unit 126 in preparation for the supply interruption of the commercial power source 1 and the supply power to be used during the self-use power use time. The battery unit 127 supplies power to the load device 1 through the inverter unit 123 during a power failure.

Hereinafter, the configuration of the uninterruptible power supply unit 120 and the operation of the control unit 140 with respect to the uninterruptible power supply unit 120 according to an embodiment of the present invention will be described.

4 is a block diagram illustrating a circuit diagram of the uninterruptible power supply unit 120 and an operation of the controller 140 according to an embodiment of the present invention.

Referring to FIG. 4, the uninterruptible power supply unit 120 according to an embodiment of the present invention includes a fuse unit 121 connected to an input side, a rectifier unit 122 connected to an output side of the fuse unit 121, and a rectifier unit 122. It may include an inverter unit 123 connected to the output side of the), an LC filter unit 124 connected to the output side of the inverter unit 123, and a reactor unit 125 connected to the output side of the LC filter unit 124. . In addition, the uninterruptible power supply unit 120 may include a battery charging circuit 126 and a battery 127 connected to an input line and an input neutral and connected in parallel to an input terminal of the inverter unit 123.

The rectifier 122 connects the first capacitor C1 and the second capacitor C2 in parallel with respect to the input neutral terminal, and has a first diode D1 and a second capacitor C2 connected in series with the first capacitor C1. ) May be formed by connecting a second diode D2 connected in series to the input line terminal in parallel. By the rectifier 122 having the above structure, the input power is half-wave rectified.

The inverter unit 123 may include a plurality of serially connected switching elements Q1, Q2, Q3, and Q4. In addition, the inverter unit 123 may operate in an instantaneous voltage control scheme by the IGBT. Signals from the inverter controller 147 of the controller 140 to be described later may be transmitted to the gate terminals of the switching elements Q1, Q2, Q3, and Q4 to generate an AC output synchronized with the input side.

The LC filter unit 124 may include a second inductor L2 connected in series with the inverter unit 123 and a third capacitor C3 connected in parallel with the second inductor L2.

The reactor unit 125 may include a reactor L3 connected in series with the second inductor L2 of the LC filter unit 124.

The control unit 140 includes a switch control unit 141, an input terminal measuring unit 142, an output terminal measuring unit 143, a variable impedance control unit 144, a safety device unit 145, a PLL circuit unit 146, and an inverter control unit 147. And a time setting unit 148. In FIG. 4, only the controller 140 is connected to the uninterruptible power supply unit 120. However, the controller 140 may also control the variable impedance unit 130 and the first to third switches SW1, SW2, and SW3. It is connected.

The switch control unit 141 distinguishes the normal mode, the power failure mode, and the device abnormal mode according to the values measured by the input terminal measuring unit 142, the output unit measuring unit 143, and the safety device unit 145 described later. The on / off operation of the switch SW1 and the second switch SW2 is controlled. In addition, the switch controller 141 may also recognize the self-power providing mode according to the time zone set in the time setting unit 148 to control on / off operations of the first to third switches SW1, SW2, and SW3.

The input stage measuring unit 142 is connected to the input terminal of the uninterruptible power supply unit 120 and the input terminal of the variable impedance unit 130. The input stage measuring unit 142 may measure the voltage, current, and phase of the input terminal of the uninterruptible power supply unit 120 and the input terminal of the variable impedance unit 130.

The output stage measuring unit 143 is connected to the output terminal of the uninterruptible power supply unit 120 and the output terminal of the variable impedance unit 130. The output stage measuring unit 143 may measure the voltage, current, and phase of the output terminal of the uninterruptible power supply unit 120 and the output terminal of the variable impedance unit 130.

The values measured by the input terminal measuring unit 142 and the output terminal measuring unit 143 are transmitted to the switch control unit 141 to distinguish the normal mode, the power failure mode, and the device abnormal mode from the switch control unit 141.

The variable impedance controller 144 calculates the impedance value of the uninterruptible power supply unit 120 based on the values measured by the input terminal measuring unit 142 and the output terminal measuring unit 143, and calculates the impedance value of the variable impedance unit 130. The same control as the impedance value of the uninterruptible power supply unit 120. Accordingly, the amount of current flowing through the uninterruptible power supply unit 120 and the variable impedance unit 130 in the normal mode becomes equal. Accordingly, the basic charge amount of the battery unit 127 becomes 50% of the total supply amount of the Senate power source 1.

In addition, the variable impedance controller 144 may adjust the amount of current flowing through the uninterruptible power supply unit 120 and the variable impedance unit 130 based on the value detected by the detector 160. The impedance of the unit 130 may be controlled. Accordingly, the amount of current flowing through the uninterruptible power supply unit 120 is adjusted to adjust the amount of charge of the battery unit 127. For example, assuming that the total supply amount of the commercial power supply 1 is 100%, the variable impedance controller 144 may have a current amount supplied from the uninterruptible power supply unit 120 of the total supply amount from 10% to 90%. The impedance of the variable impedance unit 130 may be adjusted to be%, and the variable is monitored until the amount of current flowing through the uninterruptible power supply unit 120 reaches a desired value by monitoring the value detected through the detection unit 160. The impedance of the impedance unit 130 may be adjusted. Accordingly, the charge amount of the battery unit 127 may be adjusted to 10% to 90%.

The reason why the variable impedance controller 144 and the detector 160 operate as described above is that the total time of the set self-power time zone and the time for supplying power from the battery unit 127 may be different. For example, when the total time of the self-power time zone is greater than the time that the battery unit 127 supplies power, the battery unit 127 must store a greater amount of power than the set charge amount, the battery unit The charging amount of (127) should be increased than the basic charging amount. And, if the total time of the self-power time zone is less than the time to supply power from the battery unit 127, the power inevitably generated in the uninterruptible power supply unit 120 by reducing the amount of charge of the battery unit 127 The transmission loss can be reduced. That is, in this case, since the amount of current flowing through the uninterruptible power supply unit 120 is also reduced, the power transmission loss generated by the uninterruptible power supply unit 120 is reduced by that much. In this way, the variable impedance control unit 144 may adjust the amount of charge of the battery unit 127 according to the total time of the preset self-power time zone. The safety device unit 145 is an abnormality of the uninterruptible power supply unit 120. Detect. When the abnormality of the uninterruptible power supply unit 120 is detected by the safety device unit 145, the safety device unit 145 transmits the abnormality mode of the device to the switch controller 141. The switch controller 141 closes the first switch SW1 and opens the second switch SW2. The circuit configuration of the safety device 145 will be described later with reference to FIG. 5.

The PLL circuit unit 146 generates an inverter reference frequency signal and a carrier signal that are synchronized with the input phase measured by the input stage measuring unit 142 as a reference.

The inverter control unit 147 converts the inverter reference frequency signal and the carrier signal generated by the PLL circuit unit 146 and the inverter signal 123 in order to synchronize signals between the input side and the output side of the uninterruptible power supply unit 120. To the gate terminals of Q2, Q3, and Q4). By the operations of the PLL circuit section 146 and the inverter control section 147, the input phase and the output phase are synchronized. In particular, the present invention may be useful when the uninterruptible power supply unit 120 is connected in parallel in a modular form by precisely synchronizing the input phase and the output phase by the operations of the PLL circuit unit 146 and the inverter controller 147.

When the time setting unit 148 enters the preset self-power-use time zone, the time setting unit 148 transmits the self-power providing mode to the switch controller 141. In addition, the switch controller 141 turns on the first switch SW1 for a predetermined time and turns off the second and third switches SW2 and SW3 to turn off the battery unit 127 of the uninterruptible power supply unit 120. The power charged in the is supplied to the load device (6).

In addition, the time setting unit 148 transmits to the switch control unit 141 that the self power supply mode ends when the set time zone ends. At this time, the switch control unit 141 ends the control according to the self-power providing mode, in accordance with the values measured in the input stage measuring unit 142, the output unit measuring unit 143 and the safety device unit 145, the normal mode, By distinguishing the power failure mode and the device fault mode, the on / off operation of the first switch SW1 and the second switch SW2 is controlled to operate the uninterruptible power supply system 100 in any one mode.

The time setting unit 148 may adjust the storage power usage time of the battery unit 127 according to the amount of charge of the battery unit 127. For example, if the total time of the preset self-power-use time zone is greater than the total time to use the stored power of the battery unit 127, the total time of the self-power use time zone is set according to the amount of charge of the battery unit 127. On the contrary, when the total time for using the stored power of the battery unit 127 is greater than the total time for the self-power-use time zone, the total time for the self-power-use time zone may be increased.

As such, the self-power-use time zone is adjusted according to the amount of charge of the battery unit 127 through the time setting unit 148, or as described above, the total of the self-power-use time zones is adjusted through the variable impedance controller 144. The amount of power that can be supplied from the battery unit 127 may be adjusted according to time.

The self-power-use time zone of the time setting unit 148 may be set by a user or an administrator directly inputting the control unit 140, and may also be set through a wireless communication method in a mobile device or a power management server using a smart application. It is possible. In this case, since the external system and the control unit 140 may communicate through the wireless communication unit 150, the time setting unit 148 through the wireless communication unit 150 for information on the self-power usage time zone received from the external system. Can be delivered.

In addition, the self-power-use time zone may be set in association with a program that can determine the time zone when the power usage is the most. The program may identify a place where the power reserve rate falls not only for each time zone but also for each region, and set an appropriate self-use time zone for each region. In addition, the program may automatically set its own power use time zone according to the electric charge differential system, and may select and set any time zone desired by a user or an administrator. In this case, the user may use a mobile device equipped with a smart application, or the administrator may directly control the time setting unit 148 remotely through the management server.

On the other hand, the controller 140 may adjust the amount of power output to the load device 6 to about 10% to 90%. For example, if the power used by the load device 6 is 6KW, 100% may be used as the power provided by the commercial power supply 1, or only the power of the uninterruptible power supply unit 120 may be used. If 100% of the power is used, the total available time is reduced than when using the commercial power source (1), so 5KW (50%) is used in the uninterruptible power supply unit 120, and the remaining 4KW is It may be controlled to be used in combination with the power provided by the commercial power source (1).

Hereinafter, the configuration and operation of the safety device unit 145 of the control unit according to an embodiment of the present invention will be described.

5 is a circuit diagram illustrating an embodiment of the safety device 145 of FIG. 4. More specifically, FIG. 5 illustrates an embodiment of the safety device portion 145 of the input line terminal and the input neutral terminal for the output line terminal and the output neutral terminal.

4 and 5, the safety device unit 145 of the control unit 140 according to an embodiment of the present invention may be connected in parallel to one side of an input terminal of the uninterruptible power supply unit 120. The safety device 145 serves to prevent a risk such as a fire that may occur in an internal circuit of the uninterruptible power supply unit 120 due to a failure in the uninterruptible power supply unit 120. Specifically, the safety device 145 outputs a signal to short the switching element Qp1 at the PWM IN terminal. Then, the current passing through the switching element Qp1 and the CT element is detected by the current sensing terminal. In the normal mode, that is, when the uninterruptible power supply unit 120 operates normally, current is detected at the current sensing terminal to determine the normal operation of the uninterruptible power supply unit 120. When the fuse unit 121 is disconnected due to a failure in the device abnormal mode, that is, the uninterruptible power supply unit 120 is checked, no current is sensed at the current sensing terminal, and the abnormality of the uninterruptible power supply unit 120 is detected. The switch is transferred to the control unit 141 to control the first switch SW1 and the second switch SW2.

According to an embodiment of the present invention, the uninterruptible power supply system according to the present invention is a commercial power source in comparison with the conventional on-line uninterruptible power supply to deliver 100% of the commercial power to the loading through the uninterruptible power supply. Since only 50% of the power is passed through the uninterruptible power supply unit to the load, power transmission loss inevitably generated in the uninterruptible power supply unit is reduced.

Further, in comparison with the conventional off-line uninterruptible power supply, which takes a transition time during mode conversion from normal to power failure, the uninterruptible power supply system according to the present invention does not have a transition time in mode conversion.

In addition, the uninterruptible power supply system according to an embodiment of the present invention can adjust the output of the uninterruptible power supply unit without using a transformer, thereby reducing power transmission loss and improving efficiency.

In addition, in the uninterruptible power supply system according to the present invention, since half of the power passes through the uninterruptible power supply unit normally and the other half passes through the variable impedance unit, the uninterruptible power supply unit having a capacity size of half the capacity to be delivered to the load. As a result, the system can be further miniaturized.

In addition, the uninterruptible power supply system according to the present invention is the phase synchronization of the input and output terminals of the uninterruptible power supply unit is precisely made, and includes a reactor unit, it is advantageous for the modular type of the uninterruptible power supply unit, that is, parallel connection, operation of high power factor This is possible.

In addition, the self-power time zone is set to the peak power time zone, and when entering the set time zone automatically provides the power stored in the uninterruptible power supply unit 120 to the load device 6 to distribute the peak power use time zone It is possible to reduce the overload of the equipment and to increase the reserve power reserve during peak hours compared to the supply power.

In addition, by setting the self-use time zone to the use time zone according to the electric tariff differential system, when entering the set time zone automatically provides the power stored in the uninterruptible power supply unit 120 to the load device 6, more economical in terms of electricity usage Has an effect.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and any person skilled in the art may apply the present invention without departing from the gist of the present invention. It is to be understood that various changes and modifications may be practiced within the scope of the appended claims.

100: uninterruptible power supply system
110: input filter unit
120: uninterruptible power supply unit
130: variable impedance unit
140:
150: wireless communication unit
160: detection unit
SW1: first switch
SW2: second switch
SW3: third switch

Claims (16)

An uninterruptible power supply unit including a battery unit, a battery charging circuit unit for charging the battery unit with an external input power source, a rectifying unit for rectifying an external input power source, and an inverter unit for converting the power rectified in the rectifying unit into AC power;
A first switch connected in series to the uninterruptible power supply;
A variable impedance unit connected in parallel to the uninterruptible power supply unit and the first switch;
A second switch connected in parallel to the uninterruptible power supply unit and the first switch and connected in series with the variable impedance unit;
A third switch connected between an uninterruptible power supply unit and a connection node of the variable impedance unit and an external input power source; And
A control unit controlling an impedance of the variable impedance unit and controlling the first switch to the third switch so that power is continuously supplied to the load unit,
The controller may be configured to set a self-power-use time zone, and control the first switch to the third switch to cut off an external input power in a set self-power-use time zone and to supply power to the battery unit. ,
The self-power usage time zone,
Uninterruptible power supply system characterized in that it is set to at least one time zone of the peak power use time zone and the use time zone according to the electric charge differential system. The method of claim 1,
The uninterruptible power supply unit,
A fuse unit for protecting the uninterruptible power supply unit; And
An LC filter unit connected to an output terminal of the inverter unit and serving as an output filter;
An uninterruptible power supply system, characterized in that it further comprises a reactor unit for preventing a sudden change in the alternating current of the output stage. The method of claim 1,
The inverter unit is an uninterruptible power supply system characterized in that it operates in an instantaneous voltage control method by the IGBT. The method of claim 1,
The control unit,
A switch controller for controlling the first switch to the third switch;
An input terminal measuring unit measuring an input terminal voltage, a current, and a phase of the uninterruptible power supply unit and the variable impedance unit;
An output stage measuring unit measuring voltage, current, and phase of an output terminal of the uninterruptible power supply unit and the variable impedance unit;
A variable impedance controller configured to change an impedance value of the variable impedance based on the values measured by the input terminal measuring unit and the output terminal measuring unit;
A PLL circuit unit generating a signal for synchronizing an input terminal signal and an output terminal signal of the uninterruptible power supply unit;
An inverter controller which controls the inverter unit based on the signal of the PLL circuit unit;
A time setting unit for setting a peak power use time zone; And
Uninterruptible power supply system characterized in that it comprises a safety device for detecting the current flow of the uninterruptible power supply unit to determine the abnormality of the uninterruptible power supply unit. The method of claim 4, wherein
The uninterruptible power supply system further comprises a detection unit for detecting the amount of current output from the uninterruptible power supply unit and the variable impedance unit. The method of claim 5, wherein
The variable impedance control unit,
The impedance of the variable impedance unit is controlled to adjust the amount of current flowing through the uninterruptible power supply unit and the variable impedance unit based on the value measured by the input terminal measuring unit and the output terminal measuring unit and the value detected by the detecting unit. Uninterruptible power supply system characterized in that for adjusting the amount of charge of the battery unit. The method according to claim 6,
The time setting unit, based on the amount of charge of the battery unit, the uninterruptible power supply system, characterized in that for adjusting the total time of the self-power-use time zone. The method of claim 4, wherein
The variable impedance control unit,
And the variable impedance unit controlling the same impedance as the uninterruptible power supply unit. The method of claim 4, wherein
In the time setting section,
The uninterruptible power supply system, characterized in that the peak power use time period is set to at least one of the input method and the direct input using the wireless communication in the external system. The method of claim 8,
And a wireless communication unit which receives a wireless control signal including information on the self-power usage time zone from an external system, transmits the wireless control signal to the time setting unit, and transmits the detected information to the external system through the control unit. Uninterruptible power supply system. delete The method of claim 1,
The control unit,
The uninterruptible power supply system, characterized in that for controlling the first switch to the third switch in accordance with the normal mode, power failure mode, self-power providing mode and the device fault mode. 13. The method of claim 12,
The control unit,
And turning on the first switch to the third switch in the normal mode so that external input power is transmitted to the load through the uninterruptible power supply and the variable impedance unit. 13. The method of claim 12,
The control unit,
The uninterruptible power supply system according to claim 1, wherein the first switch is turned on and the second switch is turned off in the power failure mode to supply power to the battery unit. 13. The method of claim 12,
The control unit,
In the self-power providing mode, the first switch and the third switch is turned on and the second switch is turned off, so that the power of the battery unit is supplied to the load for the set peak power usage time. Feeding system. 13. The method of claim 12,
The control unit,
And turning off the first switch and turning on the second switch and the third switch in the device abnormal mode, such that external input power is transmitted to the load through the variable impedance unit.

Images