KR101375229B1 - Street light control devices in grid-tied street light systems - Google Patents

Abstract

A street light control device in a grid-tied street light system is disclosed.
The street lamp control device is for controlling a street lamp having a power generation device that generates DC power through solar and wind power generation. When the current time information satisfies the night time condition by comparing the current time information with a predetermined night time condition, Turn on the street light using AC power supplied from the external commercial system, turn off the AC power supplied from the commercial system when the night time condition is out, and turn off the street light. Monitor power levels and short circuits. The storage unit of the device stores identification information including a night time condition, a monitoring result provided by the controller, a group address to which the street lamp belongs and an individual address of the street lamp, and the display unit stores the monitoring result provided by the controller and the identification information of the street lamp. Mark together.
According to this, it can efficiently supply electric power using natural energy, but can stably operate street lamps without any electric power gap, and monitor the amount of power produced / consumed from street lamps to control point / light out and track weather and power generation failure. Can be.

Description

Apparatus for Street Light Control in Grid-Connected Street Light System}

The present invention relates to a streetlight control technology, and more particularly, to a streetlight control apparatus included in a streetlight system using solar or wind power generation.

Initially, street lamps were operated by a local manager to manually turn on / off the circuit breaker, but as the automation was performed, the street lamps were developed to be turned on by a power source, that is, a commercial power source.

However, if the collective lighting method using a commercial power source is applied, a huge power loss occurs in order to perform the role of a street lamp that illuminates the street at night, and there is a problem that it is difficult to properly detect and cope with individual failures of the street lamp. .

On the other hand, the development of alternative energy technology using solar light or wind power, and the production of solar energy and wind energy increases, the technology that combines alternative energy to the street light has been introduced.

Conventional photovoltaic street light or wind power street light is a battery type, and converts solar and wind power received during the day into electrical energy and stores it in a battery, which is used at night.

However, in the case of the battery-type solar / wind power street light, the maintenance cost required for frequent failure and replacement of the battery is continuously required.

In addition, when the initial cost is increased due to the purchase of expensive batteries, and when the amount of power generation is insufficient, such as cloudy weather, there is a problem that the street lamp does not operate at night because the batteries are not sufficiently charged.

If a low capacity storage battery is used, the use of a high output lamp is impossible. In order to solve this problem, when a low-light three-wavelength lamp or a light emitting diode (LED) is used as an illumination source, there is a problem that the street light becomes dark due to the storage power limitation of the battery.

Korean Patent Registration No. 10-1025222

The present invention has been proposed in order to solve the problems of the prior art as described above, the purpose of which is to provide an efficient power supply using natural energy, the system-linked street light that can stably operate the street light without the power gap It is to provide a streetlight control device in the system.

Another object of the present invention is to provide a streetlight control device in a grid-connected streetlight system that can be used for monitoring the amount of power produced / consumed in the streetlight, point / light control, weather and power generation failure tracking.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not to be construed as limiting the invention as defined by the appended art. It will be possible.

In accordance with an aspect of the present invention, there is provided a street light control device, which includes a device for controlling a street light having a power generation device for generating DC power through solar power and wind power generation, comprising: a real time clock (RTC) circuit part; The current time information provided from the RTC circuit unit is compared with a predetermined night time condition. When the current time information satisfies the night time condition, the street lamp is turned on by using an AC power supplied from an external commercial system, and the night time condition is set. A control unit for shutting off the AC power supplied from a commercial system to turn off the street light, and monitoring the amount of power generated by the solar and wind power generation of the street light, the amount of power consumed, and whether there is a short circuit; A storage unit for storing identification information including a night time condition, a monitoring result provided by the controller, a group address to which the street lamp belongs, and an individual address of the street lamp; A display unit which displays the monitoring result provided by the controller together with the identification information of the street light; And a watchdog timer circuit unit that detects a failure of the controller and performs a reset function by itself.

The street light control device may include: a power measurement unit configured to measure the amount of generated power and power consumption of the street light and provide the same to the controller; And a short circuit monitoring unit configured to detect a short circuit of a lamp or a line of the street light and notify the controller of the short circuit. In this case, the power measuring unit, the lamp power consumption measuring unit for measuring the amount of power used in the lamp of the street light; Photovoltaic power generation measuring unit for measuring the generated power generated by the solar cell of the street light; And it may include a wind power generation measuring unit for measuring the generated power generated by the wind generator of the street light.

The controller may determine that the solar power generation amount of the street light is less than a threshold value to determine the dark weather, and supply AC power from a commercial system regardless of time to light the street light.

The street light control device is connected to a plurality of street light control devices, PLC communication unit for performing a power line communication (PLC) communication with the upper system to selectively perform individual control, group control, integrated control of the street lights It may further include.

The controller may be connected to an upper system through a PLC communication unit to monitor the amount of generated power of the adjacent street lamp adjacent to the street lamp, and to generate power through a difference between the generated power of the street lamp and the generated power of the adjacent street lamp adjacent to the street lamp. Failures can be tracked.

The controller may determine that the solar power is less than a threshold value and the difference between the solar power of the street light and the solar power of the adjacent street light is within a predetermined standard deviation. Regardless, the street light can be turned on by supplying AC power from a commercial system.

The controller may track brightness of a street lamp installation area based on the amount of photovoltaic power generation of the street lamp and control dimming of an LED (Light Emitting Diode) provided in the display unit according to the tracked brightness.

In the streetlight control apparatus, when operating independently without access to a higher-level system through a network, a night time condition may be set based on sunrise data and sunset data of a streetlight installation area.

The streetlight control device may further include a GPS communication unit for communicating with a global positioning system (GPS). In this case, the controller may periodically correct current time information through the GPS communication unit.

According to the streetlight control device in the grid-connected streetlight system, it is possible to stably operate the streetlight without the power gap while providing efficient power supply using natural energy.

In addition, by monitoring the amount of power produced / consumed in the street lamp, it can be used for point / lights control, weather and power generation failure tracking.

1 is a block diagram of a system-linked street light system according to an embodiment of the present invention.
2 is a block diagram of a street light control apparatus in a grid-associated street light system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the system-linked street lamp system according to a preferred embodiment of the present invention, and the street lamp control device in the system.

1 is a block diagram of a system-linked street light system according to an embodiment of the present invention.

Referring to FIG. 1, a street light system according to an exemplary embodiment may include a grid-connected inverter 200 for converting power generated from a street light 100 installed at a site and a street light 100 to transmit power to a commercial system 500. ), A street lamp control device 300 for controlling the street lamp 100, and a distribution box control device 400 connected thereto.

In addition, according to one embodiment, the power obtained from the street lamp 100 using solar and wind power is transmitted to the commercial system 500, the street lamp from the commercial system 500 during the night time when the street lamp 100 is turned on Power is supplied in the direction (100) to be used as a power source of the street lamp (100).

As illustrated in FIG. 1, each street lamp 100 is provided with a power generation device 120 and a grid-connected inverter 200.

In addition, each street light 100 is provided with a street light control device 300 individually, the distribution box control device 400 is a plurality of street light control device 300 is provided for each street light 100 by PLC (Power Line Communication) communication. Connected to the field.

As the PLC communication is performed, the distribution box control device 400 and the plurality of street light control devices 300 are connected to each other by a power supply line for receiving AC power from the commercial system 500. When each streetlight control device 300 and the distribution box control device 400 performs the PLC communication using the power supply line, it is possible to reduce the additional network construction cost and communication cost is efficient.

1 illustrates a case in which two lamps 111 and 112 are provided in the lamp unit 110 of the street lamp 100, but the present invention is not limited thereto, and the lamp included in the lamp unit 110 may be described. The number of can vary depending on the embodiment.

At the top of the street lamp 100, a power generation device 120 for producing DC power through solar and wind power generation is installed. In one embodiment, the power generation device 120 is a solar cell 122 and a wind generator 121, mainly to produce a DC power source using photovoltaic power and wind power during the daytime when the street light 100 is turned off. .

DC power generated by the solar power and wind power in the power generation device 120 of the street lamp 100 is converted into AC power through the grid-connected inverter 200 is transmitted to the commercial system 500.

The grid-connected inverter 200 converts DC power produced using solar light and wind power from the power generation device 120 installed in the street lamp 100 into AC power and transmits the electric power toward the commercial system 500.

The street lamp control device 300 is for controlling the lighting and turning off of the connected street lamp 100. The lamp unit of the street lamp 100 uses AC power supplied from the commercial system 500 toward the street lamp 100 during the night time. Turn on (110). In this case, the streetlight control apparatus 300 may control the lighting and turning off of each lamp 111 and 112 through the relay switch units 371 and 372 connected to the lamps 111 and 112 of the lamp unit 110. .

In addition, the street light control device 300 measures and monitors the amount of power generated, power consumption, and leakage of the connected street light 100, and informs the distribution box control device 400 of the corresponding information through PLC communication.

To this end, as illustrated in FIG. 1, CT (Current Transformer) 301 and 302 for power generation power monitoring at each position of a line connected to the power generation device 120 and the lamp unit 110 of the street lamp 100 is consumed. Current transformers (Current Transformer) 303 and 304 and a ground fault detection zero phase current transformer (ZCT) 305 may be installed.

The street light control device 300 generates power through the street light 100 through the CTs 301 and 302 for monitoring the amount of generated power passing a signal transmitted from the power generation device 120 of the street light 100 to the grid-connected inverter 200. It measures the amount of power and detects the abnormality of the power generation function by using the measured amount of generated power.

At this time, the position of the CT (301, 302) for monitoring the amount of power generated by the photovoltaic and wind power generation may be the front end of the grid-connected inverter 200, as shown in Figure 1, or the grid-linked inverter 200 It can also be the end of).

Similarly, the street light control device 300 uses a CT (303, 304) for monitoring the power consumption for passing a signal transmitted from the commercial system (500) to the lamp unit (110) of the street lamp (100) and a short circuit detecting ZCT (305). The amount of power consumption of the street lamp 100 and the presence of a short circuit are detected.

As in one embodiment, when there are two lamps included in the lamp unit 110 of the street lamp 100, two power consumption monitoring CT (303, 304) connected to each lamp (111, 112) is provided do. The short circuit detecting ZCT 305 may detect a short circuit occurring in the two lamps 111 and 112. The street light control device 300 detects a short circuit of a line or two lamps 111 and 112 through a short circuit detecting ZCT 305, and when a short circuit is detected on either side, the lamps 111 and 112 of the street light 100 are immediately detected. Turn off all).

The distribution box control device 400 is a higher-level system for controlling the street light control device 300 through PLC communication. The distribution box control device 400 is connected to the plurality of street light control devices 300 to individually control, group control, and integrate the street light 100. Perform control selectively.

For example, in the case of integrated control, the distribution box control device 400 collectively controls all the street light control devices 300 to apply the same day time and night time criteria, thereby simultaneously lighting all the street lights 100 and turning off at the same time. do. At this time, all of the street lights 100 are turned on for the same night time to receive power from the commercial system 500.

Alternatively, the distribution box control apparatus 400 may individually apply the criteria of the day time and the night time to each street light 100 through individual control.

Alternatively, the distribution box control apparatus 400 may group the target street lights 100 into several groups (eg, regional standards) through group control to set day and night times differently for each group. In this case, the range of the day / night and the time to turn on and off each group, and the basis of the power supplied from the commercial system 500 may be determined by the street lamp flashing schedule, the sunrise time and the sunset time by region.

In the conventional system having a storage battery in a street lamp to use solar light, when the charging voltage supplied to the battery of the street lamp or the DC-DC converter is determined to be an undervoltage, the AC power supplied from the outside is switched.

However, as described above, such a battery system has a certain limit in the initial cost, maintenance cost, storage power generation capacity, storage capacity, etc. required for the battery installation.

In order to overcome this limitation, one embodiment is obtained by the power generation device 120 installed for photovoltaic and wind power generation during the day when the street lamp 100 is turned off, instead of supplying external power by measuring the excess and insufficient voltage. Power is unconditionally transmitted to the outside, and during the night when the street lamp 100 is turned on, a relatively cheap late night power is supplied to the street lamp 100.

That is, in one embodiment, when the storage battery can not be charged with solar energy, instead of the conventional method using a commercial power source, the electrical energy generated by the power generation device 120 is supplied to the commercial power source, regardless of whether the battery is charged at night Implements a method of lighting the street lamp 100 by using a commercial power supplied from the outside.

According to this configuration, by using the characteristics of the street lamp 100 which is turned off during the day can be supplied to the power generated mainly during the day to commercial power to save energy, and relatively cheap at night when the street lamp 100 should be turned on Late night power is available. Therefore, it is very efficient in terms of power operation.

2 is a block diagram of a street light control apparatus in a grid-associated street light system according to an embodiment of the present invention.

Referring to FIG. 2, the street light control apparatus 300 according to an exemplary embodiment may include a controller 310, a real time clock (RTC) circuit unit 320, a storage unit 325, a power measurement unit 330, and an earth leakage monitoring unit. 340, a communication unit 350, a watchdog timer circuit unit 360, a switch unit 370, and a display unit 380.

The RTC circuit unit 310 is a clock configured to maintain operation even when the main power is turned off by a separate power supply. An RTC circuit 310 receives an external clock (for example, 32 KHz) and divides it into a unit clock (for example, 1 Hz) to serve as a reference. Create a clock and use it to create and adjust time / calendar values such as year, month, day, hour, minute, second, and day of the week. The controller 310 receives current time information through the RTC circuit 310.

Here, the current time information is a part of the time / calendar value obtained by the RTC circuit unit 310 (eg, month, hour), and is used as a reference for determining a night time condition.

The control unit 310 compares the current time information provided from the RTC circuit unit 310 with a predetermined night time condition. When the current time information satisfies the night time condition, the controller 310 uses an AC power supplied from an external commercial system 500. When the connected street light 100 is turned on and the night time condition is out of the state, the AC power supplied from the commercial system 500 is turned off to turn off the corresponding street light 100 so that the DC power produced by the power generation device 120 is connected to the grid. The inverter 200 is converted into AC power to be supplied to the commercial system 500.

In this case, the controller 310 turns on / off the first relay switch unit 371 connected to the first lamp 111 of the street lamp 100 and the second relay switch unit 372 connected to the second lamp 112. In this way, the street lamp 100 can be turned on or off.

In addition, the controller 310 interlocks with the power measuring unit 330 and the ground fault monitoring unit 340 to monitor the amount of power generated by solar and wind power generation, power consumption, and a ground fault of the street lamp 100.

The storage unit 325 stores a night time condition, a monitoring result provided by the controller 310, and identification information including a group address to which the street lamp 100 belongs and an individual address in a group of the street lamp 100.

The display unit 380 displays the monitoring result provided by the controller 310 together with the identification information of the street lamp 100.

The night time condition that is the point / lighting standard of the street light 100 may be set slightly differently according to the region where the street light 100 is installed and the current date. For example, the night time is set shorter in the summer of June to August, and the night time is set longer in the winter of September to December.

The watchdog timer circuit unit 360 detects a failure of the controller 310 and performs a reset function when a failure is detected. The watchdog timer may be configured to determine whether a predetermined condition is satisfied within a predetermined time, for example, by counting a timer and checking whether a toggle signal is received from the controller 310 at a predetermined time. A failure of 310 may be detected.

The power measuring unit 330 measures the amount of generated electricity and the amount of power consumed by the street lamp 100 periodically or at a predetermined time point or according to a command of the controller 310, and provides the measured amount to the controller 310.

In one embodiment, the power measuring unit 330 includes a first lamp power consumption measuring unit 331, a second lamp power consumption measuring unit 332, a photovoltaic power generation measuring unit 333, and a wind power generation power measuring unit 334. It includes.

The first lamp power consumption measuring unit 331 is installed on a line connecting the commercial system 500 and the first lamp 111 of the street lamp 100 to be installed on the lamp unit 110 of the street lamp 100. The amount of power consumed by the lamp 111 is measured and provided to the controller 310. The second lamp power consumption measuring unit 332 is installed on a line connecting the commercial system 500 and the second lamp 112 of the street lamp 100 to be installed on the lamp unit 110 of the street lamp 100. The amount of power consumed by the lamp 112 is measured.

The photovoltaic power generation measurement unit 333 is installed on a line connecting the solar cell 122 and the grid takeover inverter 200 of the power generation device 120 through the solar cell 122 installed in the street lamp 100. Measure the generated power generation. The wind power generation measuring unit 334 is installed on a line connecting the wind generator 121 and the grid takeover inverter 200 of the power generator 120 to generate the wind power generator 121 installed in the street lamp 100. Measure the generated power.

The earth leakage monitoring unit 340 detects a short circuit of the lamps 111 and 112 of the street lamp 100 or a line to which the lamps 111 and 112 are connected to notify the controller 310.

The communicator 350 includes a PLC communicator 351, a GPS communicator 352, and a short range communicator 353.

The PLC communication unit 351 supports the controller 310 to perform PLC communication with the distribution box control device 400, which is an upper system of the street light control device 300.

The GPS communication unit 352 is a part for communicating with a global positioning system (GPS), and the control unit 310 provides the time / calendar value of the RTC circuit unit 310 and the RTC circuit unit 310 through the GPS communication unit 352. The current time information can be corrected periodically.

The short range communication unit 353 is for communicating with an external remote controller and may be implemented using an infrared sensor. The operator operates the remote controller to display street light identification information including a group address (for example, an installation area code) to which the street light 100 belongs and an individual address in the group on the street light control device 300 through the short range communication unit 353. Can be set manually. Alternatively, the point / lighting of the lamps 111 and 112 of the street lamp 100 may be manually controlled.

Each part of the communication unit 350 described above may be omitted or integrated according to an embodiment.

In one embodiment, the display unit 380 described above includes a first light emitting diode (LED) unit for displaying the amount of generated power, the amount of power consumed, the group and the individual address, the PLC transmission / reception mode, the first and the second lamps ( And a second LED unit indicating whether the 111 and 112 are turned on / off, the GPS state, and whether the power is on or off.

In addition, the control unit 310 according to an embodiment tracks the brightness of the street light installation area based on the amount of photovoltaic power generation of the street light 100 and adjusts the dimming of the LEDs provided in the display unit 380 according to the tracked brightness. Can be controlled. For example, when the amount of photovoltaic power generation is less than or equal to a threshold value, dimming of the LED of the display unit 380 is controlled to a certain degree brighter than a standard, and vice versa.

In addition, when the street light control device 300 operates standalone without being connected to an upper system through a network, a night time condition may be set based on sunrise data and sunset data of a street light installation area. For example, when a worker inputs recent sunrise data and sunset data of an area where the street light 100 is installed by using a remote controller, the controller 310 sets a night time condition based on the input sunrise / sunset data and stores the storage unit 325. Stored in, and will be able to control the lighting and turn off of the street lamp 100 based on this.

On the other hand, the distribution box control device 400 integrally manages monitoring information, control information, and the like for the street lights 100 in a predetermined region. Therefore, the control unit 310 is connected to the distribution box control device 400 through the PLC communication unit 351, and monitors the amount of generated power of the adjacent street lamp (s) adjacent to the street lamp 100, and the amount of generated power of the street lamp 100 And the failure of the power generation function may be tracked through the difference between the amount of power generated by the adjacent street lamp (s) adjacent to the corresponding street lamp 100.

However, when only the amount of generated power of one street light 100 is a reference, it may be difficult to determine whether the weather is affected or whether the power generation function is broken.

Therefore, when information on the amount of generated power of the individual street light 100 and the amount of generated power of the adjacent street light (s) is collected together, the power generation function failure of the specific street light 100 may be tracked through the difference between the generated power of each street light.

In one embodiment, when the amount of photovoltaic power generation of the street light 100 measured by the photovoltaic power measurement unit 333 is less than or equal to the threshold value, the controller 310 controls the dark weather (eg, cloudy weather, snow, rain, etc.). Determined to be able to control the street lamp 100 by supplying AC power from the commercial system 500 regardless of the current time.

For example, when the weather is clouded and the amount of photovoltaic power generation decreases, the street lamp 100 is turned on even during daytime to implement street light control through the relationship between the weather and the amount of generated power.

In another embodiment, when the amount of photovoltaic power generation of the street light 100 is less than or equal to a threshold, and the difference between the amount of photovoltaic power generation of the street light 100 and the amount of photovoltaic power generation of the adjacent street light (s) is within a standard deviation, The controller 310 may determine dark weather, and supply the AC power from the commercial system 500 to light the street lamp 100 regardless of time.

If the amount of photovoltaic power generation of the street light 100 is less than or equal to a threshold value and the difference in photovoltaic power of the street light 100 and the adjacent street light (s) is out of a standard deviation, the power generation of the corresponding street light 100 It is judged to be a malfunction.

The configuration of the street light control device in the grid-tied street light system according to the present invention can be implemented in various modifications within the range allowed by the technical idea of the present invention without being limited to the above-described embodiment.

100: street light, 110: lamp unit,
120: generator, 200: grid-connected inverter,
300: street light control device, 310: control unit,
320: an RTC circuit part, 330: a power measurement part,
340: a leakage monitoring unit, 350: a communication unit,
360: watchdog timer circuit portion, 370: switch portion,
380: display unit, 400: distribution box control device,
500: commercial system

Claims (9)

In the device for controlling a street light is installed power generation device for producing DC power through solar and wind power generation,
RTC (Real Time Clock) circuit portion; The current time information provided from the RTC circuit unit is compared with a predetermined night time condition. When the current time information satisfies the night time condition, the street lamp is turned on by using an AC power supplied from an external commercial system, and the night time condition is set. When off, the AC power supplied from the commercial system is cut off to turn off the street light so that the DC power produced by the power generation device is converted into AC power through a grid-connected inverter to be supplied to the commercial system. A controller for monitoring the amount of power generated by the wind power generation, the amount of power consumed, and whether there is a short circuit; A storage unit for storing identification information including a night time condition, a monitoring result provided by the controller, a group address to which the street lamp belongs, and an individual address of the street lamp; A display unit which displays the monitoring result provided by the controller together with the identification information of the street light; And a watchdog timer circuit unit that detects a failure of the controller and performs a reset function by itself. A power measuring unit measuring the amount of generated power and the amount of power consumed by the street light and providing the generated amount to the controller; And a short circuit monitoring unit for detecting a short circuit of a lamp or a line of the street light and informing the controller.
The power measuring unit may include: a lamp power consumption measuring unit installed on a line connecting a commercial system and a lamp of the street lamp to measure an amount of power consumed by the lamp of the street lamp; A photovoltaic power generation measurement unit installed on a line connecting the power generation device and the grid-type inverter to measure the generated power generated by the solar cell of the street light; And a wind power generation measurement unit installed on a line connecting the power generation device and the grid-type inverter to measure the generated power generated by the wind generator of the street light.
delete The apparatus of claim 1,
When the amount of photovoltaic power generation of the street light is less than the threshold value, it is determined that the dark weather, the street light control device for supplying AC power from a commercial system irrespective of time to turn on the street light.
The method of claim 1,
Street light control further comprising a PLC communication unit for performing power line communication (PLC) communication with an upper system connected to the plurality of street light control devices to selectively perform individual control, group control, and integrated control of the street lights. Device.
5. The apparatus of claim 4,
It is connected to the upper system through the PLC communication unit to monitor the generated power amount of the adjacent street light adjacent to the street light, and to track the failure of the power generation function through the difference between the generated power of the street light and the generated power of the adjacent street light adjacent to the street light. Street light control device, characterized in that.
6. The apparatus of claim 5,
When the amount of photovoltaic power generation of the street light is less than a threshold value and the difference between the amount of photovoltaic power generation of the street light and the amount of photovoltaic power generation of the adjacent street light is within a predetermined standard deviation, it is determined that the weather is dark and commercially irrespective of time. Street light control device characterized in that to light the street light by supplying AC power from the system.
The apparatus of claim 1,
A streetlight control device for tracking the brightness of the street lamp installation area based on the amount of solar power generation of the street light, and controls the dimming of the LED (Light Emitting Diode) provided in the display unit according to the brightness tracked .
The method of claim 1,
In the case of operating in a stand-alone manner without being connected to a higher-level system through a network, a streetlight control device, characterized in that the night time conditions are set based on the sunrise data and sunset data of the street light installation area.
The method of claim 1,
Further comprising a GPS communication unit for communicating with the GPS (Global Positioning System),
The controller is a streetlight control device, characterized in that for periodically correcting the current time information via the GPS communication unit.

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