KR20150004477A - Power supply control system and method - Google Patents

Abstract

The present invention relates to a device and a method for controlling power supply and, more particularly, to a device for controlling power supply, comprising: a power grid state determination unit which determines abnormalities of a power grid; an operation mode change unit which changes an operation mode to operate the power grid in a grid-connected operation mode when the power grid is normal and operate the power grid in a single operation mode when the power grid is failed; a grid-connected operation mode control unit which controls charging and discharging of an energy storage device to stabilize an output of power generated from a renewable energy source and supply the stabilized power to the power grid when the power grid operates in the grid-connected operation mode; and a single operation mode control unit which controls the power grid to supply power to a load according to a state of charge (SOC) state of the energy storage device when the power grid operates in the single operation mode.

Description

[0001] POWER SUPPLY CONTROL SYSTEM AND METHOD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply control apparatus and method, and more particularly, to a power supply control apparatus and method, And more particularly to a power supply control apparatus and method for continuously supplying power to a local load even when the power supply is generated.

Renewable energy is an energy source that replaces petroleum, including solar, wind, and marine energy. A new or renewable energy source is a grid-connected type in which a single or a plurality of generators constitute a power generation complex. Generally, it controls the maximum output point according to the changing wind speed or irradiation amount, and supplies the generated power to the power system .

However, it is difficult to control the electric power produced because the renewable energy source utilizes the natural force, and when the applied ratio increases, the stability of the electric power system may be adversely affected due to the change of output. In the worst case, There may be situations that need to be done.

In order to solve such a problem, there is a function of limiting the output by applying a mechanical or electrical device to the power source, but it is difficult to control the output value required for stable power supply of the power source.

In particular, when a failure occurs in the power system, there is a limitation that the power source is stopped and the power system is restored.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a power supply system, a power supply system, And to provide a power supply control device and method for continuously supplying power.

A power supply control apparatus according to an embodiment of the present invention includes a power system state determination unit for determining whether a power system is abnormal; An operation mode changing unit that operates in a grid-connected operation mode when the power system is in a steady state and changes an operation mode to operate in a stand-alone operation mode when a failure occurs in the power system, ; A grid-connected operation mode control unit for controlling charging and discharging of the energy storage device to stabilize the output of the power generated from the renewable energy source and supply the stabilized power to the power system when operating in the grid-connected operation mode; And a single operation mode control unit for controlling power supply to the load according to a state of charge (SOC) state of the energy storage device when operating in the single operation mode.

In the power supply control apparatus according to an embodiment of the present invention, when the power system is in a steady state, the operation mode changing unit switches the power system, the wind power generator, the reactive power compensation apparatus, the power conversion apparatus, And to operate in the grid-connected operation mode in which the operation is performed.

In the power supply control apparatus according to an embodiment of the present invention, the grid-connected operation mode control unit controls the charge / discharge of the energy storage device based on the power output amount of the renewable energy source and the SOC information of the energy storage device .

In the power supply control apparatus according to an embodiment of the present invention, the operation mode changing unit may be configured such that when a failure occurs in the power system, the power conversion apparatus, the energy storage device, the diesel generator, the solar generator, It is possible to control to operate in the single operation mode.

In the power supply control apparatus according to an embodiment of the present invention, when the SOC state of the energy storage device is equal to or greater than a predetermined threshold value, the single operation mode control unit controls the power supplied to the load by the diesel generator and the energy storage device The diesel generator and the energy storage device can be controlled so that the efficiency is maximized.

In the power supply control apparatus according to an embodiment of the present invention, when the SOC state of the energy storage device is less than a predetermined threshold value, the single operation mode control unit controls charging and discharging of the energy storage device by power supplied from the diesel generator, The diesel generator and the energy storage device can be controlled to supply power to the load.

According to an embodiment of the present invention, there is provided a power supply control method comprising: determining whether a power system is abnormal; Changing an operation mode to a single operation mode when a failure occurs in the power system as a result of the abnormality determination; Determining a state of charge (SOC) state of the energy storage device; And controlling the diesel generator and the energy storage device to supply electric power to the load depending on whether the SOC state is equal to or greater than a predetermined threshold value.

In the power supply control method according to an embodiment of the present invention, the step of supplying power to the load may be performed by the diesel generator and the energy storage device, when the SOC state of the energy storage device is equal to or greater than a predetermined threshold, Controlling the diesel generator and the energy storage device such that power efficiency supplied to the diesel generator and the energy storage device is maximized; And controlling the diesel generator and the energy storage device to charge the energy storage device and supply power to the load by the power supplied from the diesel generator if the SOC state of the energy storage device is less than a preset threshold value Step < / RTI >

The power supply control method according to an exemplary embodiment of the present invention may further include performing output stabilization and reactive power compensation control in the grid-connected operation mode when the power system is determined to be in a normal state as a result of the abnormality determination .

In the power supply control method according to an embodiment of the present invention, when the power system is returned to the normal state, the operation mode may be changed to the grid connection operation mode.

According to the present invention, in a power generation system using a renewable energy source, it is possible to stabilize the power output of the power generation system by controlling the charging and discharging of the energy storage device, and to supply power to the peak load time period, Can be maximized.

In addition, even when a failure occurs in the power system, the power supply can be reliably improved by continuously supplying power to the local load by changing to the stand-alone operation mode.

1 is a block diagram illustrating an association between a power supply control apparatus and other devices for power supply according to an embodiment of the present invention,
2 is a block diagram showing a power supply control apparatus according to an embodiment of the present invention,
3 is a flowchart illustrating a power supply control method according to an embodiment of the present invention.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term "comprises," "comprising," or " comprising ", etc. should not be construed as necessarily including the various components or steps described in the specification, Or some steps may not be included, or may be interpreted to include additional components or steps.

Also, suffixes "module", "unit" and "part" for the components used in the present specification are given or mixed in consideration of ease of specification, and each component having its own distinct meaning or role no.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements 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.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

1 is a block diagram illustrating an association between a power supply control apparatus and other devices for power supply according to an embodiment of the present invention.

Referring to FIG. 1, a power supply control apparatus 800 according to an embodiment of the present invention includes a power system 100, a wind power generator 200, a reactive power compensation apparatus 300, a power conversion apparatus 410, The power generated by the photovoltaic generator 600 as the renewable energy is supplied to the power system 100 in cooperation with the storage device 420, the diesel generator 500, the solar generator 600, and the load 700 And controls power to be supplied to the load 700 when the power system 100 fails.

The wind power generator 200, the reactive power compensator 300, the power converter 410, the diesel generator 500, the solar generator 600, and the load 700, which are included in the power system 100, 20, 30, 40, 50, 60, and 70 may be provided in the energizing path to which the first and second power sources are connected.

The power system 100 is a concept that includes power plants, transmission and distribution lines, substations, and consumers, etc., which refers to all the facilities related to the production of electric power, from transmission to consumption to consumption.

The wind turbine generator 200 generates electricity using wind energy, which is a kind of renewable energy, and supplies the electricity to the power system 100.

The reactive power compensating device (300) is a device for compensating reactive power in connection with the power system (100).

The power conversion device 410 is associated with the power system 100 and the energy storage device 420 to convert and supply power.

The energy storage device 420 stores the electric power generated from the generator in association with the electric power conversion device 410, and supplies the electric power stored at the required time.

The diesel generator 500 uses a diesel engine to drive the generator to produce and supply electricity.

The solar power generator 600 directly converts solar energy, which is a type of regenerative energy, into electricity and supplies it to the power system 100.

The load 700 consumes electric power and may include an object that consumes electricity, such as a building, a factory, or the like.

Since the above-described configurations are the same as those widely used in the art, a detailed description thereof will be omitted.

The power supply control apparatus 800 controls the charging and discharging of the energy storage device 420 to stabilize the output of the power generated from the solar generator 600 as a new and renewable energy and supply it to the power system 100. [ And a function of controlling power supply to the load 700 after changing the operation mode through the switching of the breaker 10, 20, 30, 40, 50, 60, 70 in the event of a failure of the power system 100 Respectively.

In other words, when the power system 100 is in the steady state, the power supply control apparatus 800 performs the output stabilization function by linking the configurations in the block indicated by A in Fig. 1 as the grid- The power supply to the load 700 can be continued by switching to the stand-alone operation mode and linking the configurations in the block indicated by B in Fig.

Hereinafter, the detailed configuration and functions of the power supply control apparatus 800 according to an embodiment of the present invention will be described more specifically with reference to FIG.

2 is a block diagram illustrating a power supply control apparatus according to an embodiment of the present invention.

2, the power supply control apparatus 800 according to an embodiment of the present invention includes a power system state determination unit 810, an operation mode change unit 820, a grid-linked operation mode control unit 830, And a mode control unit 840.

The power system state determination unit 810 determines the state of the power system 100 and determines whether the power system 100 is in a normal state or a failure has occurred.

The operation mode change unit 820 is for changing the operation mode according to the state determined by the power system state determination unit 810 and includes first to seventh circuit breakers 10, 20, 30, 40, 50, 60 , 70). ≪ / RTI >

Specifically, when the power system 100 is in a normal state, the operation mode changing unit 820 changes the operation mode of the power system 100, the wind power generator 200, the reactive power compensator 300, the power converter 410, The energy storage device 420 and the diesel generator 500 when the failure occurs in the power system 100. The power storage device 420 is connected to the power storage device 420, The photovoltaic generator 600, and the load 700 are operated in conjunction with each other.

The grid-connected operation mode control unit 830 is for controlling the output stabilization function when operating in the grid-connected operation mode when the power system 100 is in a normal state.

Specifically, the grid-connected operation mode control unit 830 controls the charge / discharge of the energy storage device 420 based on the amount of power output of the renewable energy source and the state of charge (SOC) information of the energy storage device 420 So that the output of the power produced from the renewable energy source can be stabilized and supplied to the power system 100.

The single operation mode control unit 840 is for controlling an operation as a single operation mode when a failure occurs in the power system 100 and is not a normal state.

More specifically, when the SOC state of the energy storage device 420 is equal to or greater than a predetermined threshold value (for example, 25%), the single operation mode control unit 840 controls the diesel generator 500, Controls the energy storage device 420 and controls the diesel generator 500 and the energy storage device 420 in the SOC control operation mode of the energy storage device 420 when the SOC state of the energy storage device 420 is less than a predetermined threshold value. can do.

Here, the efficient operation mode of the diesel generator 500 is controlled to maximize the power efficiency supplied by the diesel generator 500 and the energy storage device 420, and the SOC control operation mode of the energy storage device 420 is controlled by the diesel generator 500, And controls the charging of the energy storage device 420 and the power supply to the load 700 by the electric power supplied from the generator 500.

Table 1 shows the change of operation state of each component according to the operation mode.

Operation mode Wind generator Reactive power
Compensation device energy
Storage device Diesel generator sunlight
generator Grid connection
Operation mode Maximum output point
Control Reactive power,
Power factor / voltage control New play
Output Stabilization
Control - Maximum output point
Control Exclusive
Operation mode Maximum output point
Control Voltage control System stabilization
Drup control CVCF,
SOC control of energy storage device Maximum output point
Control

3 is a flowchart showing a power supply control method according to an embodiment of the present invention, and shows a power supply control method in a state in which the power system is operating in the grid-connected operation mode as a steady state.

Referring to FIG. 3, first, it is determined whether or not the power system is abnormal (S310). If it is determined that the power system is in a normal state, output stabilization and reactive power compensation control are performed (S320).

On the other hand, when a failure occurs in the power system, the operation mode is changed to the above-described single operation mode through the switching of the breaker (S330).

Thereafter, the diesel generator is started and the load is turned on, and a preparatory work for controlling the solar generator and the energy storage device in the single operation mode is started (operation S340).

If the energy storage device SOC state is determined (S350), the diesel generator and the energy storage device are controlled in an efficient operation mode of the diesel generator (S360) If the SOC state of the energy storage device is less than the predetermined threshold value, the diesel generator and the energy storage device are controlled in the energy storage device SOC control operation mode (S370).

Thereafter, when it is confirmed that the power system is restored to the normal state (S380), the operation mode is changed to the grid connection operation mode through the switching of the breaker to control the operation (S390).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

10, 20, 30, 40, 50, 60, 70:
100: Power system
200: Wind generator
300: reactive power compensation device
410: power conversion device
420: Energy storage device
500: Diesel generator
600: Solar generator
700: Load
800: power supply control device
810: Power system state determination unit
820: Operation mode changing section
830: grid-connected operation mode control section
840: Single operation mode control section

Claims (10)

A power system state determination unit for determining whether or not the power system is abnormal;
An operation mode changing unit that operates in a grid-connected operation mode when the power system is in a steady state and changes an operation mode to operate in a stand-alone operation mode when a failure occurs in the power system, ;
A grid-connected operation mode control unit for controlling charging and discharging of the energy storage device to stabilize the output of the power generated from the renewable energy source and supply the stabilized power to the power system when operating in the grid-connected operation mode; And
And a single operation mode control unit for controlling power supply to the load according to the state of charge (SOC) state of the energy storage device when operating in the single operation mode.
The method according to claim 1,
Wherein the operation mode changing unit is configured to change the operation mode of the power system, the wind power generator, the reactive power compensation device, the power conversion device, and the energy storage device to operate in a grid- controller.
3. The method of claim 2,
And the grid-connected operation mode control unit controls charge / discharge of the energy storage device based on the power generation amount of the renewable energy source and the SOC information of the energy storage device.
The method according to claim 1,
Wherein the operation mode changing unit operates to operate in a single operation mode in which the power conversion apparatus, the energy storage device, the diesel generator, the solar generator, and the load operate in conjunction with each other when a failure occurs in the power system.
5. The method of claim 4,
Wherein the single operation mode control unit controls the diesel generator and the energy storage device so that the power efficiency supplied to the load is maximized by the diesel generator and the energy storage device when the SOC state of the energy storage device is equal to or greater than a predetermined threshold value, Power supply control device.
5. The method of claim 4,
Wherein the single operation mode control unit controls the diesel generator and the energy storage unit to charge the energy storage device and supply power to the load by the power supplied from the diesel generator when the SOC state of the energy storage device is less than a predetermined threshold, A power supply control device for controlling a storage device.
Determining whether the power system is abnormal;
Changing an operation mode to a single operation mode when a failure occurs in the power system as a result of the abnormality determination;
Determining a state of charge (SOC) state of the energy storage device; And
And controlling the diesel generator and the energy storage device to supply electric power to the load depending on whether the SOC state is equal to or greater than a predetermined threshold value.
8. The method of claim 7,
Wherein the step of supplying power to the load comprises:
Controlling the diesel generator and the energy storage device such that power efficiency supplied to the load by the diesel generator and the energy storage device is maximized when the SOC state of the energy storage device is equal to or greater than a predetermined threshold value; And
Controlling the diesel generator and the energy storage device to charge the energy storage device and supply power to the load by the power supplied from the diesel generator if the SOC state of the energy storage device is less than a preset threshold value / RTI >
8. The method of claim 7,
And performing output stabilization and reactive power compensation control in a grid-connected operation mode when the power system is determined to be in a normal state as a result of the abnormality determination.
10. The method of claim 9,
And changing the operation mode to the grid-connected operation mode when the power system is returned to the normal state.

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