KR101698831B1 - Apparatus for providing Stability of Power for emergency and Method for controlling the same - Google Patents

Abstract

The present invention relates to a power safety supplying technology during blackout and, more specifically, to a power safety supplying device capable of permanently operating a control system for reconnecting a power network and a system during the blackout. According to the present invention, the power supply can be maintained in an operating control system regardless of failure at any point, and the failure of the operation control system caused by blackout can be prevented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power supply apparatus and a control method thereof,

Field of the Invention [0002] The present invention relates to a technique for power supply safety during power outage, and more particularly, to a power safety supply device that enables the continuous operation of a control system for power grid / grid re-connection in case of power failure.

Generally, the micro grid system is a system that can supply power and heat simultaneously to a small power supply system near the demand site. That is, microgrid is a small-scale power supply system that consists of distributed power (solar, wind, etc.), battery (power storage) and so on.

The micro grid is usually operated in a linked operation mode in which power is traded in connection with a large-scale power system. In the event of a fault in the power company's line, the micro grid is switched to a stand-alone operation mode in which power is separated from the power system. It is mainly installed in buildings, university campuses, factories, etc., and aims to reduce electricity costs and improve reliability of power supply.

To improve power supply reliability, one of the objectives of microgrid installation, microgrid must be operated uninterruptedly. In the event of a fault in the power system, it should be accurately detected and the upper power system and the micro grid should be separated quickly.

In addition, if a fault occurs in the micro grid, it is necessary to quickly separate only the relevant part to prevent power failure. On the other hand, the magnitude and direction of the fault current vary depending on the connection state of the micro grid and the power system, the connection state of each distributed power source, the fault occurrence position, and the fault occurrence pattern.

In addition, the control method of the micro grid system is divided into a central control method and a local control method. That is, the local control method of the micro grid system should be composed of a distributed power source that can autonomously operate the micro grid using voltage and frequency information, but has a fast dynamic characteristic. However, there is a problem in that a dispersed power source having a fast dynamic characteristic has a limitation of the amount of charged energy and / or the amount of discharged energy, so that a plurality of distributed power sources must be used for long-term operation.

Meanwhile, the central control system of the micro grid monitors the distributed power source and / or the load, and collects related information such as voltage and frequency from the central control device. The central control device transmits the output value command of the distributed power source and / or the energy storage device to the distributed power source and the energy storage device again using the collected information.

Since the central control system of the micro grid system transmits information such as voltage and frequency from the distributed power source and the load to the central control apparatus through communication, it is difficult to maintain the balance of power supply and supply with deterioration of electric quality due to communication delay .

Particularly, there is a problem that power supply to the central control unit, which is an operation control system, is interrupted when shutting off the power grid / grid or in a power grid in the micro grid, resulting in power grid failure of the entire system.

In addition, if power supply to the operational control system due to failure is interrupted, the operational control system loses control due to state monitoring signals, mutual monitoring, and no power for operational control signals, which extends to power failure .

Korean Patent No. 10-1219883 (entitled " Coordination Control System and Method for Energy Storage Device for Micro Grid ") has been proposed as a method for solving this, and a diagram showing this is shown in FIG. 1, a plurality of distributed power sources 100, a first energy storage device 120, a second energy storage device 130, a central control device 140, and the like are included.

However, in this case, since the power supply is supplied to the load using the battery when the system is in a power failure state, the power supply to the central control unit 140, which is the operation control system for power failure, is interrupted. have.

1. Korean Patent No. 10-1219883 2. Korean Patent No. 10-1215396

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above problems, and provides a power safety supply device and a control method thereof for enabling a control system for re-coupling with a power grid / .

It is another object of the present invention to provide a power safety supply device and a control method thereof for a standby mode operation and a stand-alone mode operation of a control system for a power grid / system re-connection.

SUMMARY OF THE INVENTION The present invention provides a power safety supply device that enables the continuous operation of a control system for re-coupling with a power grid / system during a power failure in order to achieve the above-described problems.

The power safety supply device includes:

Micro Grid;

An operating controller for operating and controlling the microgrid and connected to an external power network;

Monitoring the first state of the operation control period and the second state of the operation control period and the second state of the operation control period with the external electric power network and, if it is not a failure due to a fault, An uninterruptible power supply that supplies emergency power to the operating controller upon a power outage; And

And an electricity distribution board connected to the external power grid to supply power directly to the micro grid.

In this case, if the first state indicates a failure state according to the monitoring result, the uninterruptible power supply unit switches to a discharge mode and supplies a part of the charging power to the operating controller to maintain the operating controller in an active state. can do.

During the monitoring, if the first state does not indicate a failure state and the uninterruptible power supply is in a discharge mode, the charging mode is switched according to the second state.

Also, during the monitoring, if the first state does not indicate a failure state and the uninterruptible power supply is in a full charging mode, the operating controller is maintained in the standby mode according to the second state have.

Also, the second state may monitor a blackout according to an internal abnormality of the microgrid.

Here, the microgrid may include a plurality of electric components supplied with power from the switchboard; And a component-specific controller that transmits control signals to the plurality of electric components and exchanges mutual monitoring signals and control signals with the operation controller.

In addition, the part-by-part controller maintains the standby mode by receiving the charging power during the power failure.

In addition, the controller for each part maintains the stand-alone mode unless the power failure occurs.

In addition, the operating controller maintains the stand-alone mode unless the power failure occurs.

In addition, the uninterruptible power supply may include an uninterruptible power supply (UPS).

In addition, the power failure may be a power failure caused by an interruption of the external power grid and the operation controller or an abnormality in the micro grid.

On the other hand, another embodiment of the present invention is directed to a system and method for controlling a micro grid, comprising: an external power grid, a micro grid, an operating controller connected to the external grid to control the micro grid, CLAIMS What is claimed is: 1. A method for controlling a power safety supply, the method comprising: monitoring the first state of the operating control period with the external power network; The operation controller monitoring a second state of the operation controller; Switching the charging mode to the uninterruptible power supply by receiving charging power from the external power network if the failure is not caused by the monitoring result; And supplying emergency power to the operation controller upon a power failure due to a fault according to the monitoring result.

According to the present invention, it is possible to maintain the power supply to the operation control system regardless of a failure at a certain point, so that a failure due to a power failure can be prevented.

Another advantage of the present invention is that it is possible to maintain the standby mode operation of the control system for each part constituting each microgrid system, so that the operation operation function can be secured immediately after the failure.

Another advantage of the present invention is that stable independent network operation of the micro grid system is enabled through active activation of the operation control system.

1 is a block diagram showing a configuration of a general micro grid control system.
2 is a block diagram of a configuration of a power safety supply device 200 for maintaining operation during a power failure according to an embodiment of the present invention.
3 is a detailed block diagram of the microgrid 250 shown in FIG.
FIG. 4 is a diagram illustrating a control process of the power safety supply device 200 shown in FIG. 2. Referring to FIG.
FIG. 5 is a flowchart illustrating a process of maintaining the operation controller 230 in the standby mode according to the state monitoring shown in FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Should not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which like reference numerals refer to like elements throughout.

2 is a block diagram of a configuration of a power safety supply device 200 for maintaining operation during a power failure according to an embodiment of the present invention. 2, the power safety supply device 200 includes an external power network 210, an uninterruptible power supply 220 connected to the external power network 210 to generate charging power, an uninterruptible power supply 220, An operating controller 230 that receives power from the external power grid 210 and / or the microprocessor 230 that receives power from the power grid 240 and / or the uninterruptible power supply 220, A grid 250, and the like.

The external power network 210 may include a transmission network, a power system, and the like. Here, the transmission network generally refers to a transmission system composed of transmission lines connected in a net shape so that they can be supplied from a plurality of points to an arbitrary point. The power system generally includes a power plant, a substation, a transmission / distribution line, and a load. Accordingly, the external power network 210 supplies power to the uninterruptible power supply 220, the operation controller 230, and the switchboard 240 and the like.

The uninterruptible power supply 220 monitors the first state of the external power grid and the operational control period and / or the second state of the operational controller. In addition, according to the monitoring result, when the power failure is not caused by the failure, the power is supplied from the external power grid 210 to the charging mode or the emergency power is supplied to the operation controller 230 in case of a power failure due to a failure .

To this end, the uninterruptible power supply 220 includes a uninterruptible power supply (UPS) (not shown), a controller (not shown) for controlling the UPS, a memory (not shown) And the like.

The operation controller 230 controls the micro grid 250 and is connected to the external power grid 210, the uninterruptible power supply 220, and the switchboard 240. In particular, the operating controller 230 maintains a stand-alone mode to monitor and control the state of the microgrid 250, if not during a power failure. Of course, for this purpose, the operating controller 230 sends and receives mutual monitoring and operating control signals with the microgrid 250.

The microgrid 250 is a system capable of simultaneously supplying power and / or heat to a small scale power supply system near the place of demand. That is, microgrid is a small-scale power supply system that consists of distributed power (solar, wind, etc.), battery (power storage) and so on.

The micro grid 250 is normally operated in a linked operation mode in which electric power is traded in connection with the external power grid 210, which is a large-scale power system, through the switchboard 240. In addition, when a fault occurs in the line on the external power network 210, it is separated from the power system and switched to the independent operation mode for supplying power itself.

The switchboard 240 is connected to the external power network 210 and directly supplies power to the micro grid 250. Of course, it is also possible to supply electric power to the external power grid 210 through the switchboard 240.

3 is a detailed block diagram of the microgrid 250 shown in FIG. 3, the microgrid 250 includes an electrical component 320 that receives power from the switchboard (240 of FIG. 2), and a controller 260 that transmits a control signal to the electrical component 320, Or a part-by-part controller 310 for exchanging a control signal with the operation controller (230 in FIG. 2).

The electric component 320 may comprise a generator, a fuel cell, a microturbine, a power conversion device (e.g., a converter, an inverter, etc.), a battery, and the like. In FIG. 3, for convenience of understanding, the electric component 320 is shown as a single component, but it may be composed of one or more electric components.

3, the microgrid 250 may also be comprised of a plurality of microgrids 250. In addition, when a failure occurs in the micro grid 250, the controller 310 for each part quickly separates only the corresponding part, thereby preventing a power failure. To this end, the controller 310 for each part transmits a control signal for control to the electric component 320 side. On the other hand, the magnitude and direction of the fault current vary depending on the coupling state of the micro grid 250 and the power system, the fault occurrence position, and the fault occurrence pattern.

In addition, the controller 310 for each part maintains the standby mode by receiving the charging power from the uninterruptible power supply (220 in FIG. 2) during a power failure. That is, in addition, even when a power failure occurs, power is always supplied to the controller 310 for each part, so that operation can be immediately started when the failure of the electric part 320 is eliminated.

Of course, the controller 310 for each part maintains the stand-alone mode and can independently control the microgrid when the power failure is not detected.

FIG. 4 is a diagram illustrating a control process of the power safety supply device 200 shown in FIG. 2. Referring to FIG. Referring to FIG. 4, the uninterruptible power supply 220 monitors a first state between the external power network 210 and the operation controller 230 and / or a second state of the operation controller.

In addition, the uninterruptible power supply 220 receives the first status monitoring signal 410 according to the first status and the second status monitoring signal 420 according to the second status.

Accordingly, the uninterruptible power supply 220 can continuously monitor faults in the current power networks 230 and 250 through the first status monitoring signal. Meanwhile, during the monitoring through the first status monitoring signal, the second status monitoring signal is switched to the charging mode to perform the charging 430. [ In addition, as a result of monitoring the first state between the external power grid 210 and the operation controller 230, if there is no power failure due to a failure, the operation controller 230 controls the uninterruptible power supply 220, If the battery is being discharged, the charging mode is switched to the charging mode.

Of course, this second status monitoring signal is a signal that the operation controller 230 monitors and generates the part-by-part controller 310 and / or the switchboard 240.

Alternatively, if the uninterruptible power supply 220 is in a power failure due to a failure in the current power network 230, 250 via the first status monitoring signal, the uninterruptible power supply 220 may be in a discharge mode 450 to supply the emergency power 440 to the operation controller 230 using a part of the charging power to maintain the operation controller 230 in the active state. This activation state enables stable independent network operation of the microgrid 250.

Of course, if the micro grid 250 is also in a power failure state, the uninterruptible power supply 220 can switch to the discharge mode 450 and provide part of the emergency power 440 to the controller 310 for each part.

Through this process, the operation controller 230 can exchange status monitoring signals, mutual monitoring and operation control signals with the controller 310 and / or the switchboard 240 of the microgrid 250. That is, it is possible to sustain the standby of the operation controller or the stable independent operation of the micro grid.

On the other hand, a power failure due to a fault may be a power failure caused by an interruption of the external power grid 210 and the operation controller 230 and / or an abnormality in the micro grid 250.

FIG. 5 is a flowchart illustrating a process of maintaining the operation controller 230 in the standby mode according to the state monitoring shown in FIG. Referring to FIG. 5, the uninterruptible power supply 220 generates a first status monitoring signal 410 and a second status monitoring signal 420 (step S510).

When the first state monitoring signal 410 and the second state monitoring signal 420 are generated, it is determined whether the uninterruptible power supply is discharging (step S520).

If it is determined that the battery is being discharged, the uninterruptible power supply 220 switches to the charging mode and proceeds with charging (steps S530 and S540). Otherwise, if it is determined that the battery is not being discharged, the uninterruptible power supply 220 proceeds to the charging progress step S540.

Thereafter, if it is determined that the battery is fully charged, the operation controller 230 is kept in the standby mode if it is fully charged (steps S550 and S560). Otherwise, if it is not full charge in step S550, steps S540 to S550 are repeatedly performed.

200: Power Safety Supply
210: External power grid
220: Uninterruptible power supply
230: Operational controller
240: Switchboard
250: microgrid

Claims (12)

Micro Grid;
An operating controller for operating and controlling the microgrid and connected to an external power network;
Monitoring the first state of the external power network and the second state of the operating controller and monitoring the second state of the operating controller if the failure has not resulted in a power failure and the charging power is supplied from the external power network, An uninterruptible power supply that supplies emergency power to the operating controller upon a power outage; And
An electrical distribution board connected to the external power grid to directly supply power to the micro grid;
/ RTI >
According to the monitoring result, when the first state indicates a failure state, the uninterruptible power supply unit switches to a discharge mode to supply a part of charge power to the operation controller to keep the operation controller in an active state,
Wherein said second state monitors a power failure according to an internal abnormality of said microgrid, said power failure being a power failure caused by an interruption of said external power grid and said operating controller or anomaly in said microgrid. Power safety supply to maintain.
delete The method according to claim 1,
Wherein during the monitoring, the first state is not indicative of a failure state, and the uninterruptible power supply is in a discharge mode, the mode is switched to the charge mode according to the second state.
The method according to claim 1,
During said monitoring, said operating state is maintained in standby mode according to said second state if said first state does not indicate a fault state and said uninterruptible power supply is in a full charging mode, A power supply for maintaining the power supply.
delete The method according to claim 1,
The micro grid includes: a plurality of electrical components supplied with power from the switchboard; And
And a component-specific controller for transmitting control signals to the plurality of electric components and exchanging mutual monitoring signals and control signals with the operation controller.
The method according to claim 6,
And the part-by-part controller maintains the standby mode by receiving the charging power during the power failure.
The method according to claim 6,
Wherein the part-by-part controller maintains the stand-alone mode when not in the power failure state.
The method according to claim 1,
Wherein the operating controller maintains the stand-alone mode when not in the power failure state.
The method according to claim 1,
Wherein the uninterruptible power supply comprises an uninterruptible power supply (UPS).
delete A method for controlling a power safety supply device connected to an external power grid and directly supplying power to the micro grid, the method comprising the steps of:
The operating controller monitoring a first state of the external power network and an operating control period;
The operational controller monitoring a second state of the operational controller;
Switching the charging mode to the uninterruptible power supply by receiving charging power from the external power network if the failure is not caused by the monitoring result; And
And supplying emergency power to the operation controller upon a power failure due to a fault according to the monitoring result,
According to the monitoring result, when the first state indicates a failure state, the uninterruptible power supply unit switches to a discharge mode to supply a part of charge power to the operation controller to keep the operation controller in an active state,
Wherein said second state monitors a power failure according to an internal abnormality of said microgrid, said power failure being a power failure caused by an interruption of said external power grid and said operating controller or anomaly in said microgrid. A method of controlling a power safety supply for maintaining a power supply.

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