KR101215396B1 - Hybrid smart grid uninterruptible power supply using discharge current control - Google Patents

Abstract

The present disclosure relates to a hybrid smart grid uninterruptible power supply using discharge current control, comprising: a power supply computer providing information related to power supplied to each power grid; and a commercial power supply supplied from the power supply side in a normal driving state. In addition, the internal battery is charged at the same time, and when the power failure or voltage drop occurs, the charged internal battery power is supplied to the load, and the current power consumption is maximized based on the power information provided from the power supply computer. If it is determined to be a high-cost power time zone outside the preset range, the commercial power supplied from the power supplier and the internal battery power charged are supplied to the load, and the discharge current of the battery is controlled to supply the load. Commercial power Voltage includes a body that battery power is the same as the discharge voltage or adjusted to be smaller in linear stored therein. In addition, when the current power consumption is the maximum time zone or a high cost power time zone outside the preset range may further include a power production device for producing power to supply to the main body.
Therefore, it is possible to share the power in response to the power demand through the smooth execution of the bidirectional uninterruptible power supply function using the intelligent power grid, and the power management can be efficiently maintained, and the battery life can be greatly increased by maintaining the optimal battery state. .

Description

Hybrid smart grid uninterruptible power supply using discharge current control

The present invention relates to a hybrid smart grid uninterruptible power supply using discharge current control.

In general, uninterruptible power supply is an emergency power supply device for coping with instantaneous blackout or long power outage of important equipment such as computer, industrial automatic control, industrial facility, etc., and its marketability is infinite and it is very important power in the information age. Is one of the systems.

Conventional uninterruptible power supply apparatus of the prior art, as shown in Figure 1, the rectifying unit (1) for converting AC power (AC) to DC power (DC), and the charging unit (3) for charging the battery with a DC power output from the rectifying unit (1) ), An inverter 5 for converting the DC power output from the rectifier 1 into an AC power source, and a switch 7 for switching the AC power output from the inverter 5 to supply the load.

When the uninterruptible power supply configured as described above operates normally, the commercial AC power input from the outside through the rectifying unit 1 is converted into direct current and then supplied to the charging unit 3 and the inverter 5, and the inverter 5 switches ( Power is supplied to the load through 7).

In the normal operation state, when the power is interrupted and the input power is cut off or a voltage drop of less than the prescribed value occurs, the uninterruptible power supply device supplies the power stored in the battery of the charging unit 3 to the inverter 5 as shown in FIG. 2. Then, the inverter 5 converts the battery power into AC power and supplies the load to the load through the switch 7. Therefore, it is possible to continuously supply power to the load even in case of power failure or instantaneous voltage drop.

However, such a conventional uninterruptible power supply simply performs a unidirectional operation of supplying power to a load by using an internal energy storage device (mainly a battery) when power failure or input power is unstable, and an intelligent power grid (smart grid) Failed to perform a bidirectional operation.

Therefore, it analyzes the power supply and demand status of the input power through the intelligent power grid, checks the power supply status, supplies the optimal power to the uninterruptible power supply, charges the surplus power of the built-in battery, There is a need for technology development such as generating power or sharing load with existing power through an internal battery.

In addition, the charging unit of the conventional uninterruptible power supply is composed of a circuit for charging in two ways, equal charging and floating charging, and automatically performs equal charging about 4 hours when the discharged battery in the power failure state returns to the recharge state And, after 80% state of charge is automatically switched to floating charge is about 12 hours after full charge.

That is, since the charging part of the conventional uninterruptible charging device is composed of a circuit that charges immediately after a simple discharge separately from the power condition at the time of the battery and the recovery, there is a possibility that an electrical accident may occur due to excessive current of the initial charging inrush current during the recovery. .

Patent Registration No. 10-0947038 2010. 03. 04. Japanese Patent Publication 2003-92844 A 2003.03.28.

The present invention provides a hybrid smart grid uninterruptible power supply using discharge current control that performs a bidirectional uninterruptible function capable of transmitting and receiving data to and from an intelligent power grid out of a unidirectional uninterrupted function.

The present invention provides a hybrid smart grid uninterruptible power supply device using discharge current control that shares power charged inside or produced power with existing power at a time when power demand is maximum or at a time of high power supply.

The present invention provides a hybrid smart grid uninterruptible power supply that performs charging at a time when power supply is smooth or when power cost is low without recharging battery power immediately after power failure.

Hybrid smart grid uninterruptible power supply using the discharge current control according to an embodiment of the present invention, a power supply computer that provides information related to the power currently supplied to each power grid, and commercially supplied from the power supply side in a normal driving state When the power is supplied to the load, the internal battery is charged, and when a power failure or voltage drop occurs, the charged internal battery power is supplied to the load, and the current power usage is based on the power information provided from the power supply computer. If it is determined that it is the maximum time zone or the high cost power zone outside the preset range, the power supply is supplied to the load by allocating the commercial power supplied from the power supply and the internal battery power charged, and controlling the amount of discharge current of the battery to control the power supply. Commercially available from May include a linear body to be adjusted so that the voltage source equal to the discharge voltage of the battery power or less stored therein.

In addition, the hybrid smart grid uninterruptible power supply using the discharge current control according to an embodiment of the present invention, the power generation by the drive control of the main body when the current power consumption is the maximum time zone or a high cost power time zone outside the preset range. And, it may further include a power production device for supplying the produced power to the main body.

As described above, according to the hybrid smart grid uninterruptible power supply using the discharge current control of the present invention, beyond the unidirectional uninterrupted function that occurs during input power failure or voltage drop, the maximum demand of the unstable power demand is approached through data transmission and reception with the intelligent power grid. Or two-way uninterrupted power using intelligent power grids, because power is charged internally during high-cost power supply periods or power produced is divided between existing power and loads with precise and stable operation, and surplus power is charged during low-cost time periods. It is possible to perform the power supply function smoothly and accordingly, it is possible to manage the power efficiently by sharing the power corresponding to the power demand, and to maintain the optimal battery state through proper charging and discharging, which can greatly increase the service life of the battery. It works.

In addition, the battery does not charge the battery immediately when it is restored after performing the uninterruptible power supply function due to a power failure. It can prevent, can be stable charging even in unstable power supply, there is an effect that can minimize the power usage fee.

1 is a view for explaining the normal operation of the general uninterruptible power supply;
2 is a view for explaining an operation process during a power failure or instantaneous voltage drop of a typical uninterruptible power supply;
3 is a block diagram schematically illustrating a configuration of a hybrid smart grid uninterruptible power supply using discharge current control according to an embodiment of the present invention;
FIG. 4 is a view showing some components of FIG. 3 in detail.

Hereinafter, a hybrid smart grid uninterruptible power supply using the discharge current control of the present invention with reference to the accompanying drawings in detail.

FIG. 3 is a block diagram schematically illustrating a configuration of a hybrid smart grid uninterruptible power supply apparatus using discharge current control according to an embodiment of the present invention, and FIG. 4 is a detailed view illustrating some components of FIG. 3.

As shown, the uninterruptible power supply of the present invention includes a main body 100, a load 200, a power supply computer 300, a power production device 400, and the like.

In the normal driving state, the main body 100 supplies the commercial power supplied from the power supplier to the load 200 and simultaneously charges the battery provided therein, and when the power failure or the instantaneous voltage drop occurs, the internal battery power is charged. Is supplied to the load 200.

In addition, when it is determined that the current power usage is the maximum time zone or the high cost power time zone outside the preset range, based on the power information provided from the power supply computer 300, the commercial power supplied from the power supply side and the internal battery that is charged The power is shared and supplied to the load 200. At this time, the main body 100 controls the amount of discharge current of the battery to precisely adjust linearly so that the voltage of the commercial power supplied from the power supply side is equal to or smaller than the discharge voltage of the battery power stored therein.

In addition, when the separate power generator 400 is connected to the outside, the main body 100 may be used in the power generator 400 in addition to the internal battery power in a time zone in which the current power usage is maximum or a high cost power zone outside the preset range. The power produced directly may be shared with the existing power and provided to the load 200.

The power supplier computer 300 is a computer operated by a power supplier, such as KEPCO and the Korea Exchange, and provides various kinds of information related to the power currently supplied to each electric grid having a smart grid function device (ie, a UPS main body). , Current power consumption, hourly rate information, etc.).

The power generator 400 is connected to the main body 100, and generates power by driving control of the main body 100 when the current power consumption is the maximum time zone or a high cost power time zone outside the preset range. In addition to the driving control of the 100, it is possible to continuously generate power to charge the internal battery power of the main body 100), and supplies the produced power to the main body 100. At this time, the power production device 400 may use a solar cell, a small generator, a wind generator, and the like. In addition, any one of the electric power production and the main body 100 can be used.

On the other hand, the main body 100 is composed of a power supply unit 110, rectifier 120, charging unit 130, inverter 140, switch 150, communication unit 160, control unit 170 and the like.

The rectifier 120 converts commercial AC power supplied from the power supply unit 110 into DC power and outputs the DC power.

The charging unit 130 charges the battery with a DC power output from the rectifier 120.

The inverter 140 converts the DC power output from the rectifying unit 120 or the charging unit 130 into AC power and outputs the AC power.

The switch 150 switches the AC power output from the inverter 140 to supply the load 200.

The communication unit 160 performs data transmission / reception of information related to power currently supplied to the power supply computer 300 and the electric power grid based on the control of the control unit 170.

The controller 170 controls the supply of the load 200 of the commercial power supplied from the power supply unit 110 and the battery charging of the charging unit 130 during normal driving, and loads the battery power of the charging unit 130 in case of power failure or instantaneous voltage drop. Control to supply to (200). In addition, based on the power information received from the power supply computer 300 through the communication unit 160, it is determined whether the current power usage is the maximum time zone or a high cost power time zone outside the preset range, and the current power usage is the maximum. In the time zone or the high-cost power time zone outside the preset range, the battery charging state of the charging unit 130 is checked, and the DC voltage output from the rectifying unit 120 is based on the battery charging state information of the charging unit 130. The discharge current output of the battery is precisely controlled to be equal to or smaller than the battery discharge voltage so that the battery voltage of the charging unit 130 is shared with the DC voltage output from the rectifying unit 120 to be supplied to the load 200.

In addition, the controller 170 does not immediately charge the battery power of the charging unit 130 when the power is restored after a power failure, the current power supply state is based on the power information received from the power supply computer 300 through the communication unit 160 It is determined whether the usage time is not the maximum time zone or the predetermined low-cost power time zone, and the determination result is that the battery of the charging unit 130 is charged when the current power supply state is not the maximum power usage time or the predetermined low cost power time zone. Control to lose. In other words, the battery charging unit 130 is controlled so that the battery unit 130 is charged at a time when power supply is smooth or when the power cost is low, without recharging the battery power of the charging unit 130 immediately after power failure.

Next, the operation process of the hybrid smart grid uninterruptible power supply using the discharge current control according to the present invention configured as described above will be described in detail.

First, in a normal power supply state, the controller 170 of the main body 100 supplies an external commercial power supplied from the power supply side to the load 200 and simultaneously charges the battery of the charging unit 130.

That is, the controller 170 controls Vr ≥ Vb so that the voltage Vr output from the rectifier 120 is equal to or greater than the discharge voltage Vb of the battery, as shown in FIG. 4 in a normal operation state. The battery discharge current Ib is controlled so that a preset -15% (battery maximum current) or 0% is maintained. The current Ir output from the rectifier 120 is controlled to be 100%.

As such, when a voltage drop occurs when a power failure or a voltage below a predetermined value is supplied in the normal operation state, the controller 170 of the main body 100 loads the battery power of the charging unit 130. ).

That is, the controller 170 detects a case in which the input power is less than or equal to a preset -15% or a power failure state, and when the voltage Vr and the current Ir output from the rectifier 120 become zero, the battery of the charger 130 The operating voltage is controlled to be supplied to the load 200 by operating the discharge voltage Vb and the discharge current Ib at 100%. At this time, the main body 100 proceeds to the lowest discharge voltage, and precisely controls the discharge time of the battery based on the detection of the discharge current.

In addition, the control unit 170 of the main body 100 continuously sets a time range in which the current power usage is maximum or a preset range based on various power information currently supplied from the power supply computer 300 through the communication unit 160. Make sure you are out of high-power time zone.

If it is determined that the current power usage is the maximum time zone or the high power time zone is out of the preset range, the controller 170 divides the commercial power supplied from the power supply and the battery power of the charging unit 130 to load 200. Control to feed). That is, the controller 170 may supply power generated by the power generator 400 or built-in battery power and general power supply through a function associated with a smart grid power grid, which is a next-generation power grid, in a time zone where power consumption is maximum or a high cost power state. It is to implement a hybrid power supply technology that can be performed simultaneously.

In this case, the controller 170 determines the battery state and the remaining battery level of the charging unit 130 through internal calculations, and controls the discharge current of the power produced by the battery or the power production device 400 at a ratio suitable for the output ( 200) to enable precise power supply. That is, the controller 170 controls the battery discharge current Ib of the charger 130 such that the voltage Vr output from the rectifier 120 is equal to or smaller than the battery discharge voltage Vb of the charger 130 (ie, Vr ≦ Vb). ) To perform the load sharing with the voltage (Vr) output from the rectifier 120, in particular to detect the battery discharge voltage (Vb) and the discharge current (Ib) gradually discharged by the voltage output from the rectifier (120) Finely adjust (Vr) linearly.

Accordingly, the present invention enables a very accurate load sharing in a time zone where the current power usage is maximum or in a high cost power time zone outside the preset range, and based on stable and accurate control, an external commercial power source and / or battery It is possible to build a system capable of a hybrid function for supplying the power produced by the power source or power generator 400.

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

100: main body 110: power supply
120: rectifying unit 130: charging unit
140: inverter 150: switch
160: communication unit 170: control unit
200: load 300: power supply computer
400: power production equipment

Claims (5)

A power supply computer that provides information on the power currently being supplied to each grid;
In the normal driving state, the commercial power supplied from the power supply side is supplied to the load and the internal battery is charged. When the power failure or voltage drop occurs, the internal battery power supplied to the load is supplied to the load. If it is determined that the current power usage is the maximum time or the high cost power time out of the predetermined range based on the power information provided from the power supply, the commercial power supplied from the power supplier and the internal battery power charged are supplied to the load. The main body linearly adjusts the discharge current of the battery so that the voltage of the commercial power supplied from the power supply side is equal to or smaller than the discharge voltage of the battery power stored therein, and
When the current power consumption is the maximum time zone or a high cost power time zone outside the preset range, the power is produced by the drive control of the main body and supplies the generated power to the main body.
Hybrid smart grid uninterruptible power supply using a discharge current control including. delete The method of claim 1,
The power production device,
Hybrid smart grid uninterruptible power supply using discharge current control which is one of solar cell, small generator and wind generator. The method of claim 1,
The main body includes:
Power Supply,
Rectifier for converting the commercial AC power supplied from the power supply to a direct current power supply,
Charging unit for charging the battery with a DC power output from the rectifier,
An inverter for converting and outputting DC power output from the rectifying unit or the charging unit into AC power;
Switch for supplying to the load by switching the AC power output from the inverter,
Communication unit for performing data transmission and reception of information related to the power supplied to the power supply computer and the current electric power grid, and
Controls the supply of the commercial power supplied from the power supply to the load and the charging of the battery in the charging unit during normal driving, and controls the supply of the charging unit battery power to the load in case of power failure or instantaneous voltage drop, and through the communication unit. Based on the power information received from the power supplier computer, it is determined whether the current power usage is the maximum time zone or a high-cost power time zone outside the preset range, and as a result, the current power usage is the maximum time zone or the high cost outside the preset range. In the power time period, the battery charging state of the charging unit is checked, and the discharge current output of the battery is controlled such that the DC voltage output from the rectifying unit is equal to or smaller than the battery discharge voltage of the charging unit based on the battery charging state information of the charging unit. By the charging unit And sharing the DC voltage outputted from the battery voltage by the rectifying section to a control unit for supply to the load
Hybrid smart grid uninterruptible power supply using a discharge current control including. The method of claim 4, wherein
The control unit,
When power is restored after a power failure, the current power supply state is not a time zone when power consumption is maximum or a preset low cost power time zone based on power information received from the power supply computer through the communication unit without immediately charging the battery power of the charging unit. And determining, and determining that the current power supply state is not a time zone when the power consumption is maximum, or a predetermined low cost power time zone. The hybrid smart grid uninterruptible power supply using the discharge current control to control the charging of the battery is performed.

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