KR101506237B1 - Independant electric power system, control device and plug socket device for displaying available power - Google Patents

Abstract

The present invention relates to a socket device for supplying power to a load in a power system which is not connected to a power gird. The socket device comprises: a socket unit that is connected to a line on which a current supplied by at least one distribution power converges and that allows a plug of a load to be connected; and a display unit to display available power of a power system which is identified based on transmission power of the line, thereby adjusting load consumption by using the available power displayed by the socket device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an independent power system, a control device,

The present invention relates to a technique for controlling a power system not connected to a power system.

Microgrids, including renewable energy generators, diesel generators, and energy storage devices, can operate independently of the power system or in conjunction with the power system.

When the micro grid is operated in conjunction with the power grid, there is no problem of imbalance in power supply and demand in the micro grid because a sufficient amount of power can be supplied from the power grid. However, when the microgrid is operated independently of the power grid, an imbalance in power supply and demand may occur within the microgrid.

In this independent operating microgrid, the technology to overcome the imbalance in power supply and demand is the technology that controls the load. Since there is a limit to the amount of power generated by the distributed power source included in the micro grid, it is difficult to further increase supply in an unbalanced state of power supply and demand. Accordingly, this technique reduces the load imbalance by reducing the load usage. This technique is also commonly referred to as load control.

However, in the case of such a load control, the controller forcibly reduces the power consumption of the load that is already in operation, or shedding the load to provide a result that is difficult for the user to predict. For example, while watching TV, power to the TV may be interrupted and the TV may be turned off.

In view of the foregoing, an object of the present invention is, in one aspect, a technique for displaying supplyable electric power to an outlet device so that a user can judge load usage.

In another aspect, an object of the present invention is to provide a technique for measuring the power supply power of the entire power system in a line where the supply current of the distributed power supply is concentrated.

In order to achieve the above object, in one aspect, the present invention provides a power system not connected to a power system, comprising: at least one distributed power source connected to a first line;

At least two outlet devices connected to the second line; A third line connecting the first line and the second line; And a control device for calculating a supplyable electric power of the power system according to the transmission power of the third line and displaying a value corresponding to the supplyable electric power to at least one outlet device of the at least two outlet devices System.

According to another aspect of the present invention, there is provided a power supply system comprising: a measuring unit for calculating a transmission power of a line in which a current supplied by at least one distributed power source is concentrated in a power system not connected to a power system or acquiring a measured value of the transmission power; And a controller for calculating a supplyable power of the power system according to the transmission power of the line and displaying a value corresponding to the supplyable power to at least one outlet apparatus of at least two outlet apparatuses included in the power system And a control unit.

According to another aspect of the present invention, there is provided an outlet apparatus for supplying power to a load in a power system not connected to a power system, the outlet apparatus being connected to a line where current supplied by at least one distributed power source is concentrated, A socket part connectable to the socket part; And a display unit for displaying available power of the power system based on the transmission power of the line.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the user can arbitrarily adjust the load usage by seeing the available supply power displayed on the receptacle apparatus. Further, according to the present invention, it is possible to measure the supply power of the entire power system in a line where the supply current of the distributed power source is concentrated.

1 is a configuration diagram of a power system according to an embodiment.
2 is a block diagram of the control device of Fig.
3 is a block diagram of the receptacle device of Fig.
4 is an example of a flow in which the control device displays and controls the outlet device.
5 is an external view of an embodiment in which an indicator lamp is provided outside the receptacle device.
6 is an external view of an embodiment in which a power amount gauge is provided outside the receptacle device.
7 is a block diagram of an outlet apparatus further including a switch.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

FIG. 1 is a configuration diagram of a power system according to an embodiment, and FIG. 2 is a block diagram of the control apparatus of FIG. 1. FIG. 3 is a block diagram of the receptacle device of Fig.

Referring to Figure 1, the power system 100 includes a first line 110, a second line 130, and a third line 150 connecting the first line 110 and the second line 130 can do.

The first line 110 is connected to a dispersed power source 120 (reference numeral 120 corresponds to 120a or 120b). In the embodiment of FIG. 1, two distributed power sources 120a and 120b are connected. The distributed power source 120 includes a power generating source, which may be a renewable energy generator such as a solar generator or a wind turbine, or an energy storage device such as a battery may be used. Also, as this source, a fuel injection type generator such as a fuel cell generator or a diesel generator may be used.

The distributed power supply 120 may have an AC or DC output, which may vary depending on the state of the first line 110. For example, if the first line 110 is an AC line, the distributed power source 120 has an AC output, and the first line 110 is a DC line, then the distributed power source 120 has a DC output. When the first line 110 is an AC line and the distributed power source 120 has a DC source (e.g., a solar generator), the distributed power source 120 may further include a DC / AC converter. Also, if the first line 110 is a DC line and the distributed power source 120 has an AC source (e.g., a diesel generator), the distributed power source 120 may further include an AC / DC converter .

In the embodiment of FIG. 1, three receptacle devices 140a, 140b and 140c are connected to the second line 130, and the second line 130 is connected to the receptacle device 140 (reference numeral 140 corresponds to the reference numeral 140a, 140b or 140c) Line 130 as shown in FIG. A plug of the load can be connected to the receptacle apparatus 140. It can be understood that the receptacle apparatus 140 is substantially connected to the second line 130 because the receptacle apparatus 140 plays a role of transmitting electric power to the load. If the load is a DC load, the second line 130 may be a DC line, but if the load is an AC load, the second line 130 may be an AC line.

Continuing to refer to FIG. 1, the power system 100 includes a third line 150 that connects the first line 110 and the second line 130. Since electric power is supplied from the distributed power source 120 to the first line 110 and electric power is outputted to the receptacle device 140 from the second line 130, The power flows from the first line 110 to the second line and flows through the second line. Substantially, the third line 150 is a line in which the power supply in the power system is concentrated and flows. The power system 100 measures the current or power on the third line 150 and measures the power supply Ps supplied to the loads by the distributed power sources 120 connected to the first line 110 .

If the first line 110 and the second line 130 are AC lines, the third line 150 may also be an AC line. Alternatively, if the first line 110 and the second line 130 are lines of different power types, for example, the first line 110 is a DC line and the second line 130 is an AC line A DC / AC converter (not shown) may further be disposed in the third line 150 to convert the DC power of the first line 110 into AC power and supply the AC power to the second line 130.

The power system 100 calculates the available power of the power system 100 according to the measured value from the sensor 160 and the sensor 160 that measures the current or power flowing to the third line 150, And a control unit 170 for controlling the control units 140. If the sensor 160 is a current sensor, the controller 170 may calculate the transmit power Ps of the third line 150 by multiplying the current measurement by the voltage of the third line 150. [ If the sensor 160 is a power meter, the controller 170 may obtain the transmit power Ps of the third line 150 through the measured value of the sensor 160. [

Referring to FIG. 2, the control unit 170 determines the transmission power of the line (the third line 150 in FIG. 1) on which the current supplied by the distributed power source 120 is concentrated A measurement unit 210 for calculating the transmission power Ps or a measured value of the transmission power Ps and a control unit 210 for performing all control functions of the control device 170 using the transmission power . It can be understood that the functions other than the function of acquiring the transmission power Ps value among the functions expressed by the controller 170 performed by the controller 210 are performed by the controller 210. [ Hereinafter, for the convenience of understanding, the main body of the processing will be described as the control device 170. FIG.

The control device 170 transmits a control signal to the receptacle devices 140 to control the receptacle device 140. This control signal is transmitted through the first signal line 180 connected between the control device 170 and the receptacle device 140. The control signal may be an analog type signal or a digital type signal. In addition, the control signal may be transmitted as data to the receptacle apparatus 140 via wired communication, or may be transmitted to the receptacle apparatus 140 via wireless communication.

On the other hand, the control device 170 may receive a signal from the receptacle device 140 through the first signal line 180. For example, the control device 170 can receive a signal from the receptacle device 140 via the first signal line 180 as to whether or not a load is connected to the receptacle device 140. [

3, the receptacle device 140 displays a supplyable electric power according to a control signal received from the control device 170 together with a socket part 310 for electrically connecting the load to the second line 130 And a display unit 320 for displaying the image.

The power system 100 may further include a second signal line 190 that allows the controller 170 to receive information from the distributed power source 120 or monitor the status of the distributed power source 120 . The controller 170 can receive various information from the distributed power source 120 through the second signal line 190. [ For example, the control device 170 may receive information on the supply capacity of the distributed power supply 120 in each distributed power supply 120. For example, Alternatively, the control device 170 may receive information on the remaining fuel amount of each distributed power source 120 from the distributed power source 120. [ Alternatively, the control device 170 may simply monitor the state of the distributed power source 120 only. For example, the controller 170 may monitor only the state of whether the distributed power supply 120 is turned on or off via the second signal line 190. [

The controller 170 calculates the available power by subtracting the transmission power Ps in the third line 150 from the total supply capacity of the distributed power supply 120 that supplies power to the first line 110 , Where the total supply capacity of the distributed power supply 120 can be calculated from information on the supply capacity of the distributed power supplies 120 obtained via the second signal line 190. [ When the control device 170 does not receive information on the supply capacity from the distributed power supply 120, the controller 170 can calculate the total supply capacity by combining the supply capacity of each of the distributed power supplies 120 previously set, Or the total supply capacity may be preset in the control device 170. [

When the controller 170 monitors the state of the distributed power supply 120, the controller 170 determines that the supply capacity of the distributed power supply, which is determined to be unable to supply power through monitoring, is excluded from the total supply capacity, Power can be calculated.

When the control device 170 receives the remaining fuel amount information from the distributed power source 120, the control device 170 can display the remaining fuel amount in the outlet device to which the load of the outlet device 140 is connected.

4 is an example of a flow in which the control device displays and controls the outlet device.

4, the controller 170 estimates a total supply capacity Pa that can be supplied by the distributed power source 120 connected to the first line 110 (S402). As described above, the total supply capacity Pa may be a predetermined value or may be a value calculated from information received from the distributed power supply 120. [

4, in the step S402 of estimating the total supply capacity Pa, the third receptacle device 140c is in a no-load state. At this time, a load may be connected to the first receptacle device 140a or the second receptacle device 140b.

Thereafter, the controller 170 measures the transmission power Ps of the third line 150 (S404). The transmit power Ps may be calculated according to the current value measured from the sensor 160 and may be obtained from the sensor 160 if the sensor 160 is a power meter.

The control device 170 calculates the available supply power by using the difference between the total supply capacity Pa and the transmission power Ps and compares the available supply power with the minimum value Pmin at step S406, If it is equal to or smaller than the minimum value (NO in S406), the control device 170 sends a control signal to the third receptacle device 140c to control the third receptacle device 140c to display the supply disabled state (S408). For example, the display unit 320 of the third receptacle apparatus 140c may include an indicator lamp capable of displaying colors, and the controller 170 may control the color of the indicator lamp to be red.

Before describing the next step, an embodiment of the receptacle apparatus 140 including an indicator will be described with reference to FIG.

5 is an external view of an embodiment in which an indicator lamp is provided outside the receptacle device.

5, a socket 310a into which a plug can be inserted is exposed to the outside, and an indicator lamp 320a capable of displaying available power of the power system 100 is connected to the outside Respectively.

The indicator lamp 320a may display a single color. In the case where the indicator lamp 320a displays a single color (e.g., green or white), the receptacle apparatus 140 turns on the indicator lamp 320a when the available power is greater than the minimum value Pmin, And if the supplyable electric power is equal to or less than the minimum value Pmin, the indicator lamp 320a is turned off to indicate that the electric power system 100 can no longer supply electric power (at this time, It is preferable to use it). On the contrary, when the supplyable electric power is greater than the minimum value Pmin, the receptacle apparatus 140 turns off the indicator lamp 320a and turns on the indicator lamp 320a when the available electric power is equal to or smaller than the minimum value Pmin (In this case, it is preferable to use red light or the like as the indicator light 320a).

The display lamp 320a may display various colors. The indicator light 320a may include an optical element indicating red (red), yellow (yellow), and blue (blue) in order to display various colors. The display lamp 320a may display the natural color by adjusting the luminance of the tricolor element, or may display the red / yellow / blue color in an ON / OFF manner without adjusting the luminance. When the indicator lamp 320a can display various colors, the receptacle apparatus 140 can display the amount of supplyable power using the indicator lamp 320a. For example, the outlet device 140 controls the display lamps 320a to display a mixed color of blue and red, and controls the blue series to be energized as the available supply amount increases. As the available supply amount becomes smaller, So that the series can be controlled to be thicker.

4, if the available power is greater than the minimum value in step S406 (YES in step S406), the control device 170 transmits a control signal to the third receptacle device 140c so that the available power is displayed (S410).

The third receptacle device 140c displays the supplyable electric power in accordance with the control signal, which can be displayed using the color of the indicator lamp 320a as described above (for example, The indicator lamp 320a is displayed in green).

As another embodiment, the third receptacle device 140c can quantize the quantizable power and quantize the supplied power. For this display, the display portion 320 of the third receptacle device 140c may further include a gauge capable of displaying a quantized level.

Before describing the next step, an embodiment of an outlet apparatus 140 including a gauge will be described with reference to FIG.

6 is an external view of an embodiment in which a gauge is provided outside the receptacle device.

6, a socket 310a into which a plug can be inserted is exposed to the outside, and a gauge 320b capable of displaying available power of the power system 100 is connected to the outside Is installed.

The gauge 320b may quantize and display the available power in the power system 100. For example, in the gauge 320b, a plurality of LEDs and the like are connected in a line, and the lighting of each of the LEDs and the like can be controlled. At this time, the gauge 320b may light some of the LEDs or the like in proportion to the quantized supplyable power.

Continuing with reference to Fig. 4, a load is connected to the third receptacle device 140c after step S410. When the load is connected, the controller 170 can display the load connection state on the display unit 320 of the third receptacle device 140c. For example, if the display unit 320 displays the indicator lamp 320a in green when the available power exceeds the minimum value Pmin in the no-load state, the display unit 320 displays the indicator lamp 320a ) Can be displayed in blue.

The third receptacle device 140c receives the control signal from the control device 170 to display the load connection state. Alternatively, the third receptacle device 140c may be connected to the load 170 without the control signal of the control device 170, It is possible to recognize the connection and control the color of the display lamp 320a differently.

As another example of step S412, the third receptacle device 140c includes a gauge 320b, and through the gauge 320b when the load is connected (when the plug of the load is connected) The remaining amount can be indicated by the quantization level.

For example, before connecting the plug to the socket 310a, the user would like to make sure that the power system 100 has sufficient supply available power. To this end, the controller 170 may display the available power at the quantization level in the gauge 320b of the third receptacle device 140c in a no-load state. After the load plug is connected to the socket 310a, the user wants to know how long the power system 100 can continuously supply power. To this end, the control device 170 may display the remaining amount of fuel in the quantization level in the gauge 320b of the third outlet device 140c to which the load is connected.

On the other hand, in step S406, the control device 170 can control so as not to supply power to the third receptacle device 140c to which the load is not connected when the available power is less than the minimum value (NO in step S406). For this control, the third receptacle device 140c may further include a switch therein.

7 is a block diagram of an outlet apparatus further including a switch.

Referring to FIG. 7, the receptacle device 140 may further include a switch 710 inside the socket portion 310. The switch 710 may be connected or disconnected according to a control signal received from the controller 170 while one end is connected to the second line 130 and the other end is connected to the load.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (12)

In a power system not connected to a power system,
At least one distributed power supply connected to the first line;
At least two outlet devices connected to the second line;
A third line connecting the first line and the second line; And
And a control device for calculating a supplyable electric power of the electric power system according to the transmission power of the third line and displaying a value corresponding to the supplyable electric power in at least one outlet device of the at least two outlet devices,
Wherein the control device displays a power supply disabled state to a receptacle device to which the load is not connected when the supplyable power is equal to or less than a preset minimum value.
The method according to claim 1,
Further comprising a sensor for measuring the current in the third line,
The control device includes:
And receives the measured value of the current from the sensor to calculate the transmit power.
The method according to claim 1,
The control device includes:
Calculating the available supply power by subtracting the transmission power from the total supply capacity of the at least one distributed power supply,
And monitors the state of the at least one distributed power source and excludes a supply capacity of the distributed power source that is unable to supply power from the total supply capacity.
The method according to claim 1,
The control device includes:
Receives the remaining fuel amount information from the at least one distributed power source, and further displays a value corresponding to the remaining fuel amount in at least one outlet apparatus of the at least two outlet apparatuses.
A measuring unit for calculating a transmission power of a line in which a current supplied by at least one distributed power source is concentrated in a power system not connected to a power system or acquiring a measured value of the transmission power; And
And a control unit for calculating a supplyable power of the power system according to the transmission power of the line and displaying a value corresponding to the supplyable power to at least one outlet apparatus of at least two outlet apparatuses included in the power system ,
Wherein the control unit displays a power supply disabled state to a receptacle apparatus to which the load is not connected when the available power supply is equal to or less than a preset minimum value.
6. The method of claim 5,
Wherein,
Calculating the available supply power by subtracting the transmission power from the total supply capacity of the at least one distributed power supply,
And when the supplyable electric power is equal to or less than a preset minimum value, the electric power supply disabled state is indicated to the receptacle device to which the load is not connected.
6. The method of claim 5,
Wherein,
Wherein the controller receives the remaining fuel amount information from the at least one distributed power source and further displays a value corresponding to the remaining fuel amount in at least one outlet apparatus of the at least two outlet apparatuses.
8. The method of claim 7,
Wherein,
To the first receptacle device to which the load is not connected, the supplyable power as a quantization level,
And when the load is connected to the first receptacle device, displays the remaining fuel amount as a quantization level in the first receptacle device.
1. An outlet apparatus for supplying power to a load in a power system not connected to a power system,
A socket part connected to a line where a current supplied by at least one distributed power source is concentrated and to which a plug of the load can be connected; And
And a display unit for displaying available power of the power system based on the transmission power of the line,
Wherein the display unit displays a power supply disabled state when the supplyable power is equal to or less than a preset minimum value in a state in which a load is not connected.
10. The method of claim 9,
The display unit includes:
And a gauge for indicating the available supply power as a quantization level.
11. The method of claim 10,
The display unit includes:
And when the plug of the load is connected, displays the remaining amount of fuel of the power system as a quantization level through the gauge.
10. The method of claim 9,
Wherein the socket portion includes a switch,
Wherein the switch comprises:
Wherein the controller is connected or disconnected according to a control signal received from an external device that grasps the available power of the power system based on the transmission power of the line.

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