KR20160127236A - Smart watt-hour Metering for system interconnection with Micro Distributed Generation and control method using thereof - Google Patents

Abstract

An intelligent watt-hour meter for system connection of micro-dispersed power sources includes: a communication unit execution a bi-directional communication operation with micro-dispersed power sources; a collection unit which collects information regarding at least one of power amount, voltage, current, frequency, and phase angle of the power supply from the micro-dispersed power sources through the communication unit; a metering unit which measures the amount of power being supplied from a main power source and consumed based on the power supply amount of the micro-dispersed power sources and the power consumption of a connected load; and a control unit which analyzes system stability based on at least one of the information of the collection unit and the measurements of the metering unit and generates a control signal regarding the micro-dispersed power sources in accordance with the analysis. The control signal includes information regarding the system connection and separation of micro-dispersed power sources.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an intelligent watt-

The present invention relates to an intelligent watt-hour meter for managing and controlling a microdispensable power supply installed in a customer, and more particularly, to an intelligent watt-hour meter for controlling the grid connection and the power generation of a microdispensable power supply in consideration of voltage fluctuation, harmonics, protection coordination, power factor, And a method of controlling the intelligent watt-hour meter.

Recently, the distributed power supply market is growing rapidly due to improvement of electric power technology such as energy efficiency management and environmental problems. Such a distributed power source can be classified into a power generation mode or a power supply capacity, and can be classified into a small size, a medium size and a large size depending on the power supply capacity. Among them, medium- and large-sized distributed power sources with a power supply capacity of less than 100-10,000 kW are connected to high-voltage distribution lines or power transmission lines (power systems) and operated like large capacity power plants. Other small distributed power sources are mainly used in homes and buildings have.

However, the voltage and phase of the power produced by the equipment, generation mode, environment, etc. may not be constant, and if such anomaly occurs, the distributed main power system may cause problems.

Accordingly, in the operation of the distributed power supply, there are various protective devices for securing the quality and stability of the connection of the main power system, and the protection relays, the single operation detection device, the switch, the voltage control, Calibration device, and DC leakage detection device.

However, the above protection devices are installed and operated in medium and large distributed power sources, and separate safety devices are not installed in the ultra-small dispersed power source of 20 kW or less operated in conjunction with the low-voltage power distribution line due to the problem of power generation capacity and cost. However, even if one or more microdispersed distributed power sources are connected to the same low-voltage distribution line, there is a need for a device to prevent voltage fluctuations, harmonics, protection co-ordination, power factor and phase unbalance of the system.

An intelligent watt-hour meter for grid connection of a microdispensable power supply according to an embodiment of the present invention and its control method aims at ensuring the quality and safety of a power system connected to a microdispensable power supply by controlling a microdispensable power supply.

Further, an intelligent watt-hour meter for grid connection of a microdispensable power supply according to an embodiment of the present invention and its control method can control a voltage fluctuation of a system, a high frequency, a protection coordination, a power factor, And it is an object of the present invention to prevent occurrence of problems such as phase unbalance and the like.

Also, an intelligent watt-hour meter for grid connection of a microdispensable distributed power supply according to an embodiment of the present invention and a control method therefor include a method of remotely managing a microdispensable distributed power supply by transmitting information on power supply of the microdispensable distributed power supply to a server The purpose is to provide.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

An intelligent watt-hour meter according to an embodiment of the present invention includes:

A communication unit for performing bidirectional communication with the micro-dispersed power supply; A collector for collecting information on at least one of a power amount, a voltage, a current, a frequency and a phase angle related to a power supplied from the micro dispersion power source through the communication unit; A metering unit for measuring an amount of power supplied and consumed by the main power supply based on the amount of power consumed in the connected load and the amount of power supplied to the micro dispersed power supply; And a control unit for analyzing the stability of the system based on at least one of the information of the collecting unit and the metering of the metering unit and generating a control signal for the micro dispersed power source according to the analysis, And may include information regarding the grid connection or disconnection of the power source.

The control unit may determine generation of a reverse current on the basis of the metering and generate a control signal related to power generation amount adjustment or system separation of the micro dispersion power source when a reverse current occurs as a result of the determination.

The communication unit can perform bidirectional communication with the micro dispersed power supply through an AMI (Advanced Metering Infrastructure) network.

The metering unit may collect the amount of power consumed in the connected load through an AMI (Advanced Metering Infrastructure) network.

The communication unit may transmit the control signal to the micro-dispersed power source or the switch of the micro-dispersed power source.

The communication unit may transmit at least one of the collection information, the control signal, and the power consumption information on the load to an Advanced Metering Infrastructure (AMI) network server.

The communication unit may include at least one of RS 232, RS 422, RS 485, and UART.

According to another aspect of the present invention, there is provided a method of controlling a micro-dispersed power source using an intelligent watt-

A method for controlling a microdispensable power supply using an intelligent watt-hour meter, comprising the steps of: collecting information on at least one of a power amount, a voltage, a current, a frequency and a phase angle with respect to power supplied from a microdispensable power supply; Analyzing the stability of the system based on the collected information; And requesting grid connection or separation of the ultra-small distributed power supply based on the analysis.

Wherein the step of analyzing the stability includes determining whether at least one of the collected amount of power, voltage, current, frequency, and phase angle exceeds a predetermined threshold value range, Requesting a grid linkage when the threshold value is within a predetermined threshold value range, and requesting grid linkage if the grid linkage ratio exceeds the predetermined threshold value range.

The step of collecting the information may further include the step of collecting the amount of power consumption at the connected load, and the step of analyzing the stability may include determining the occurrence of the reverse current based on the amount of power consumed and the amount of power supplied from the micro- And the step of requesting the grid connection or separation may further include a step of requesting power generation adjustment or grid separation of the micro dispersion power source when a reverse current is generated as a result of the determination of the occurrence of the reverse current.

The step of requesting grid linkage or separation may further include transmitting at least one of the collection information, analysis information, and request information to the server.

The step of collecting the information and the step of transmitting to the server are performed through an AMI (Advanced Metering Infrastructure) network, and the server may include an AMI network server.

The intelligent watt hour meter for grid connection of the microdispensable power supply according to an embodiment of the present invention and the control method thereof can control the microdispensable power supply to ensure the quality and safety of the power system connected with the microdispensation power supply.

Further, an intelligent watt-hour meter for grid connection of a microdispensable power supply according to an embodiment of the present invention and its control method can control a voltage fluctuation of a system, a high frequency, a protection coordination, a power factor, It is possible to prevent the occurrence of problems such as phase unbalance and the like.

Also, the intelligent watt-hour meter for grid connection of the microdispensable power supply according to the embodiment of the present invention and the control method thereof can transmit the information about the power supply of the microdispensable power supply to the server to manage the microdispensable power supply remotely .

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a diagram illustrating a grid connection configuration of a micro-dispersed power supply using an intelligent watt-hour meter according to an embodiment of the present invention.
2 is a diagram illustrating a configuration of an intelligent watt-hour meter according to an embodiment of the present invention.
3 is a flowchart showing a procedure of a micro-dispersed power supply control method using an intelligent watt-hour meter according to an embodiment of the present invention.
4 is a flowchart illustrating a method for controlling a micro-dispersed power source using an intelligent watt-hour meter according to an embodiment of the present invention.
5 is a flowchart showing a procedure of a micro-dispersed power supply control method using an intelligent watt-hour meter according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The term " part " used in this embodiment means a hardware component such as software, FPGA, or ASIC, and 'part' performs certain roles. However, 'minus' is not limited to software or hardware. The " part " may be configured to be in an addressable storage medium and configured to play back one or more processors. Thus, by way of example, and by no means, the terms " component " or " component " means any combination of components, such as software components, object- oriented software components, class components and task components, Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays and variables. The functions provided in the components and parts may be combined into a smaller number of components and parts or further separated into additional components and parts.

In other words, the present invention can apply various transformations and have various embodiments, and the embodiments will be described in detail with reference to the drawings.

1 is a diagram showing a grid connection structure of a micro-dispersed power supply 200 using an intelligent watt-hour meter 100 according to an embodiment of the present invention. As shown in the figure, the micro-distributed power supply 200 grid connection structure using the intelligent watt-hour meter 100 according to an embodiment of the present invention includes an intelligent watt-hour meter 100, a micro dispersed power supply 200, a load, a data con- centration / A collection unit, a server, and the like, and can be operated in homes, shopping malls, factories, buildings, and the like.

Specifically, the intelligent watt-hour meter 100 can measure the amount of power consumed in the load based on the power supplied from the main power supplier (Utility). When the micro-dispersed power supply 200 is operated, the amount of power supplied from the intelligent watt- The total power supply amount from the main power supplier can be measured.

The intelligent watt-hour meter 100 collects and analyzes information on at least one of a power amount, a voltage, a current, a frequency, and a phase angle with respect to power supplied from the micro dispersion power source 200, The connection with the system of the portable terminal 200 or the separation thereof.

In addition, the intelligent watt-hour meter 100 may enable management at a remote location by transmitting the information and control information collected and analyzed to a server, and information transfer to the server may be performed by the DCU and / Lt; RTI ID = 0.0 > network. ≪ / RTI >

Although only one microdispersed power supply 100 is shown in FIG. 1, it may include a plurality of microdispersed distributed power sources, and the description of the 'microdispersed distributed power source' , Which applies equally to other devices.

The intelligent watt-hour meter 100 will be described in more detail with reference to Fig.

FIG. 2 is a diagram showing a configuration of an intelligent watt-hour meter 100 according to an embodiment of the present invention. The intelligent watt-hour meter 100 may include a communication unit 110, a collecting unit 120, a control unit 130 and a metering unit 140. The intelligent watt- Power can be delivered and metered to the load based on the power supply of the battery.

More specifically, the communication unit 110 can perform bi-directional communication with the micro dispersed power supply 200. The intelligent watt-hour meter 100 can collect and transmit the information from the collecting unit 120, the control signal from the control unit 130, or the weighing information from the weighing unit 140 through the communication unit 110 have. Also, the communication unit 110 may receive and transmit various information to an external DCU or a server.

The communication unit 110 can perform bi-directional communication with the micro-dispersed power supply through an AMI (Advanced Metering Infrastructure) network, and can transmit the various information to the DCU or AMI network server. The AMI network may include a PLC (Power Line Communication) network.

Also, the communication unit 110 may transmit the control signal to the micro-dispersed power source or the micro-dispersed power source.

Meanwhile, the communication unit 110 may include at least one of RS 232, RS 422, RS 485, and UART, and may include an Ethernet communication device / method.

The collector 120 may collect information on at least one of a power amount, a voltage, a current, a frequency, and a phase angle with respect to power supplied from the micro dispersion power source 200 through the communication unit 110. Also, the collecting unit 120 may collect information on the total power supply amount from the main power supplier and the amount of power consumption in the connected load.

As described above, the communication unit 110 collects the information through the AMI network and transmits the collected information to the AMI network server 110. The AMI network server 110 collects the information from the AMI network 120, .

Meanwhile, the information collection may be performed in the collection unit 120.

The control unit 130 analyzes stability of the system based on at least one of the collected information of the collecting unit 120 and the metering information of the metering unit and generates a control signal for the micro dispersed power source according to the analysis . The control signal may include information about grid linkage or separation of the microdispensable power supply.

For example, when at least one of the voltage, current, frequency, and phase angle of the micro-dispersed power supply 200 among the collected information of the collecting unit 120 is equal to or greater than a preset threshold value, A control signal for disconnecting the power source 200 from the system can be generated. The generated control signal may be transmitted to the micro-dispersed power source 200 or the switch of the micro-dispersed power source 200 through the communication unit 110, thereby separating the micro-dispersed power source 200 from the system , The system can be stably maintained.

Meanwhile, the control signal may be generated when one of the numerical values continuously exceeds a preset threshold for a predetermined time, and the control signal may be generated in the controller 130, And may be transmitted to the switch of the micro dispersed power supply 200.

The metering unit 140 can measure the amount of power supplied and consumed in the main power based on the amount of power consumed at the connected load and the amount of power supplied to the micro dispersed power source 200. [ Also, based on the metering of the metering unit 140, it is possible to detect the reverse current and control the micro dispersed power supply 200 accordingly.

For example, the control unit 130 can acquire the amount of power supplied from the micro dispersion power source 200 and the amount of power consumption in the connected load through the metering unit 140, and detects the reverse current can do. In other words, when the amount of power to be supplied exceeds the amount of power consumption, it can be determined that a reverse current has occurred in the system. In this case, by generating a control signal for power generation control or system separation of the micro dispersed power source 200, .

The control signal for power generation adjustment or system separation may be transmitted to the micro-dispersed power supply 200 through the communication unit 110 or the control unit 130 and may be transmitted to the DCU or the server for reporting.

3 is a flowchart showing a procedure of a micro-dispersed power supply control method using an intelligent watt-hour meter according to an embodiment of the present invention.

In step S310, the intelligent watt-hour meter 100 may collect status information on the power supplied from the micro-dispersed power supply. Specifically, it is possible to collect information on at least one of a power amount, a voltage, a current, a frequency and a phase angle with respect to a power supplied from the microdispensable power source.

As described above, the information collection may be performed through the communication unit 110, and the communication unit 110 may include the AMI network.

In step S320, the intelligent watt-hour meter 100 can analyze the safety of the system based on the collected status information. Specifically, when at least one of the voltage, current, frequency, and phase angle of the microdispensable power supply 200 is equal to or greater than a predetermined threshold value, it can be determined that the microdispersed power supply 200 should be disconnected from the system.

Meanwhile, the separation determination may be configured to be performed when one of the values continuously exceeds a preset threshold value for a predetermined period of time.

In step S330, the intelligent watt-hour meter 100 may connect or disconnect the micro-dispersed power supply based on the systematic stability analysis. More specifically, if it is determined through step S320 that the system isolation of a specific microdispensable power supply is separated, the control unit 110 may transmit the isolation control signal to the microdisplays 200 or the switches of the microdispensation power supply 200 through the communication unit 110 Thereby separating the micro dispersed power supply 200 from the system, so that the stability of the system can be maintained.

In step S340, the intelligent watt-hour meter 100 may transmit the state information, the stability analysis information, and the connection / separation information of the micro-dispersed power supply obtained through steps S310, S320, and S330 to the DCU or the server. Based on this transfer, the user can manage the stability of the system from a remote location.

4 is a flowchart illustrating a method for controlling a micro-dispersed power source using an intelligent watt-hour meter according to an embodiment of the present invention.

As shown, the intelligent watt-hour meter 100 may request status information for the micro-dispersed power supply 200 and the micro-dispersed power supply 200 may respond to the intelligent watt- . The state information may include at least one of a power amount, a voltage, a current, a frequency, and a phase angle with respect to power supplied from the micro dispersion power source 200.

Also, the intelligent watt-hour meter 100 can analyze the stability of the system based on the status information. For example, if at least one of the power amount, the voltage, the current, the frequency, and the phase angle with respect to the power supplied by a certain ultra-small dispersed power source exceeds a preset threshold value, it can be judged as an anomaly.

In addition, if the intelligent watt-hour meter 100 determines that it is an abnormal phenomenon as a result of analyzing based on the status information, the intelligent watt-hour meter 100 can request the systematic separation of the micro-dispersed power supply. Also, if the state information of the microdispensable power supply is normal, the grid connection can be requested.

Also, the intelligent watt-hour meter 100 can transmit the status information and the request information to a data concentrator (DCU) or a server. Based on the transmission, the user can manage the stability of the system in a remote place.

5 is a flowchart showing a procedure of a micro-dispersed power supply control method using an intelligent watt-hour meter according to another embodiment of the present invention.

In step S315, the amount of power consumption at the connected load can be collected. Specifically, the intelligent watt-hour meter 100 is located between the main power supply and the load, and can collect the amount of power consumed in the load. This power consumption collection can be done through existing metering devices or via the AMI network.

In step S325, it is possible to determine the generation of the reverse current based on the amount of power consumption and the amount of power supplied from the micro dispersion power source. For example, when the amount of power consumption collected in step S315 is 2000 W, and the amount of power supplied from the micro dispersed power source is 2100 W, it is possible to determine occurrence of a reverse current to the main power line.

As a result of the determination in step S325, if a reverse current has occurred, it is possible to request the power generation amount adjustment or system separation of the micro dispersion power source. Specifically, when a reverse current is generated, the stability of the system can be inhibited. Therefore, when a reverse current occurs, the power supply amount of the microdispensable power supply can be adjusted or separated in proportion to the amount of reverse current generation. For example, when the amount of consumption is smaller than the amount of power supplied from the micro dispersion power source, the micro dispersion power source can be systematically separated or power generation can be controlled to prevent or eliminate the generation of reverse current.

In step S345, the intelligent watt-hour meter 100 may transmit the power amount information, reverse current generation information, and adjustment / separation information of the micro-dispersed power source obtained through steps S315, S325, and S335 to the DCU or the server. Based on this transfer, the user can manage the stability of the system from a remote location.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: Intelligent watt hour meter 200: Ultra compact power supply
300: server 110:
120: collecting unit 130:
140:

Claims (12)

A communication unit for performing bidirectional communication with the micro-dispersed power supply;
A collector for collecting information on at least one of a power amount, a voltage, a current, a frequency and a phase angle related to a power supplied from the micro dispersion power source through the communication unit;
A metering unit for measuring an amount of power supplied and consumed by the main power supply based on the amount of power consumed in the connected load and the amount of power supplied to the micro dispersed power supply; And
And a control unit for analyzing the stability of the system based on at least one of the information of the collecting unit and the metering of the metering unit and generating a control signal for the micro dispersed power supply according to the analysis,
Wherein said control signal includes information about grid connection or disconnection of said microdispensable power supply.
The method according to claim 1,
The control unit
Judging occurrence of a reverse current based on the metering,
And generating a control signal for controlling power generation of the micro dispersed power supply or system separation when a reverse current occurs as a result of the determination.
3. The method of claim 2,
The communication unit
Way communication with the microdispensable power supply via an AMI (Advanced Metering Infrastructure) network.
3. The method of claim 2,
The metering unit
Through an AMI (Advanced Metering Infrastructure) network, an amount of power consumed in the connected load.
The method according to claim 1,
The communication unit
And the control signal is transmitted to the micro-dispersed power source or the switch of the micro-dispersed power source.
The method of claim 1, 2, 3, 4, or 5,
The communication unit
Wherein the intelligent watt hour meter transmits at least one of the collection information, the control signal, and the power consumption amount information in the load to an Advanced Metering Infrastructure (AMI) network server.
The method according to claim 6,
The communication unit
An RS 232, an RS 422, an RS 485, and a UART.
An ultra-small distributed power supply control method using an intelligent watt-
Collecting information on at least one of a power amount, a voltage, a current, a frequency, and a phase angle with respect to power supplied from the ultra miniature distributed power source;
Analyzing the stability of the system based on the collected information; And
And requesting grid connection or separation of the ultra miniature distributed power source based on the analysis.
9. The method of claim 8,
The step of analyzing the stability
And determining whether at least one of the collected amount of power, voltage, current, frequency, and phase angle exceeds a preset threshold value range,
The step of requesting grid linkage or separation
Requesting a grid linkage if the value is within the predetermined threshold value range, and requesting grid linkage if the grid linkage exceeds the preset threshold value range.
9. The method of claim 8,
The step of collecting the information
Further comprising collecting an amount of power consumption at the connected load,
The step of analyzing the stability
Further comprising the step of determining whether a reverse current is generated based on the amount of power consumption and the amount of power supplied from the micro dispersion power source,
The step of requesting grid linkage or separation
Further comprising the step of requesting power generation adjustment or grid separation of the microdispensable power supply when a reverse current is generated as a result of the determination of the occurrence of the reverse current.
11. The method according to claim 8, 9 or 10,
The step of requesting grid linkage or separation
And transmitting at least one of the collected information, analysis information, and request information to a server.
12. The method of claim 11,
Wherein the step of collecting and transmitting the information to the server is performed through an AMI (Advanced Metering Infrastructure) network, and the server includes an AMI network server.

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