KR20220009245A - Distributed power generation premises system with network separation and integrated power meter for distributed power - Google Patents

Abstract

According to the present invention, an integrated watt-hour meter for distributed power includes: a sensing value input unit for collecting sensing values for calculating the amount of electricity; a metering unit which calculates the amount of power and reflects it as an instrument constant pulse; an AMI processing unit which supports services which meet the communication and security requirements of an AMI; and a detachable DERGW unit which converts a value required for distributed power generation control among the sensing values into a DERMS packet and transmits it to a DERMS server. Therefore, it is possible to minimize cost of measurement and monitoring of a distribution line.

Description

DISTRIBUTED POWER GENERATION PREMISES SYSTEM WITH NETWORK SEPARATION AND INTEGRATED POWER METER FOR DISTRIBUTED POWER

The present invention provides physical security that can be used simultaneously in AMI (Advanced Metering Infrastructure) that collects power usage information from consumers and DERMS (Distributed Energy Resource Management System) that monitors and controls distributed power such as solar and wind power. It relates to a distributed power generation premises system that supports application services and an integrated watt hour meter for distributed power.

In general, renewable energy source systems such as energy storage (ESS) systems, wind power generation systems, solar power generation systems, and electric vehicle systems are managed through a distributed energy resources management system (DERMS).

Such a distributed energy resource management system (DERMS) or a distribution management system (DMS) performs real-time connection and control with various new and renewable control facilities and system breakers through a distribution network and a grid network.

Meanwhile, KEPCO is building an AMI (Advanced Metering Infrastructure) for 22 million households for remote meter reading, demand response, and behind the meter (BTM) services. In addition, the aforementioned DERMS, a distributed power monitoring and control system, is being built to unconditionally accept renewable energy sources of less than 1 MW, such as solar and wind power, in the power system.

Similar to AMI, for the purpose of monitoring distribution lines, DERMS needs to acquire measurement and measurement data such as voltage/current/wattage from distribution lines near distributed power sources. Due to KEPCO's network separation security policy between the AMI (OA network, that is, the business network) and the DERMS (the FA network, that is, the control network), the DERMS cannot directly collect measurement and metering data from the AMI watt-hour meter. Therefore, DERMS installs and operates a separate measuring and weighing device near the distributed power source. Of course, AMI data can be acquired through the network linkage device in the upper operating system, but it is difficult to use it because it cannot satisfy the real-time performance required for monitoring and control in DERMS.

As a result, in order to accommodate the exponentially increasing distributed power in the power system, additional construction costs are incurred to collect measurement and measurement data such as the voltage/current/wattage of distribution lines near the distributed power supply needed for monitoring and control purposes. In spite of the above-mentioned additional construction cost burden, additionally installed measurement and metering devices cannot expect the same measurement and metering accuracy as the watt-hour meter.

The watt-hour meter is a legal metering device, and the country guarantees the accuracy of measurement and metering. Therefore, this patent intends to propose a method for jointly utilizing the legal watt-hour meter used in AMI in DERMS while satisfying the network separation security policy of the electric power company (KEPCO).

Republic of Korea Registration No. 10-1994138

An object of the present invention is to provide a distributed power generation premises system that can jointly utilize the legal watt-hour meter used in AMI in DERMS while satisfying the network separation security policy, and an integrated watt-hour meter for distributed power.

An integrated watt-hour meter for distributed power according to an aspect of the present invention includes: a sensing value input unit for collecting a sensed value for calculating wattage; a metering unit that calculates the amount of power and reflects it as an instrument constant pulse; AMI processing unit that supports services that meet the communication and security requirements of the AMI; and a detachable DERGW unit that converts a value necessary for distributed power generation control among the sensed values into a DERMS packet and transmits it to the DERMS server.

Here, the detachable DERGW unit may be in the form of an expansion card module that can be coupled to an expansion slot provided inside the housing of the integrated watt-hour meter.

Here, the detachable DERGW unit may be equipped with one selected from a detachable DERGW unit for a high-voltage distributed power supply and a removable DERGW unit for a low-voltage distributed power supply.

Here, the sensing value input unit may be connected to the secondary side of the MOF having a CT and a PT and reading the meter by scaling down high voltage power.

Here, the metering unit may transmit the sensed value to the detachable DERGW unit.

Here, the AMI processing unit records the sensed value in the form of the DLMS packet in the secure memory, and the removable DERGW unit reads the DLMS packet recorded in the secure memory and extracts the sensed value from the DLMS packet. have.

Here, the detachable DERGW unit, the integrated watt-hour meter, the inverter of the distributed power supply and the DERMS server and the communication interface for forming a data communication channel, respectively; a metering data collection unit for collecting the sensed value from the integrated power meter; a metering data transmitter for transmitting the sensed value as a DNP packet to the DERMS server; a protocol analysis unit for extracting values from information collected as DLMS packets or modbus packets; a protocol converter converting the extracted value into the DNP packet; a power factor control command receiving unit for receiving a power factor control instruction from the DERMS server; and a power factor control command transmitter configured to transmit a power factor control command determined according to the power factor control guideline and the sensed value to the inverter.

A distributed power premises system to which network separation is applied according to another aspect of the present invention includes: an integrated watt-hour meter device that collects sensed values for estimating electric power, and packages and transmits the collected sensed values to a meter reading server and a DERMS server, respectively; a meter reading modem device for forming a channel for transmitting the sensed value packaged in the integrated power meter device to the meter reading server; Distributed power to generate electricity from renewable energy or to emit stored electrical energy; an inverter converting the power output from the distributed power source and supplying it to the grid; and forming a channel for transmitting the sensed value received from the integrated watt-hour meter to the DERMS server, controlling the operation of the inverter according to the sensed value and a guideline from the DERMS server, and the integrated watt-hour meter or the meter reading modem It may include a DERGW device that is mechanically detachable from the device.

Here, the meter reading modem device may be an SMGW device supporting various Behind the Meter (BTM) services as well as a communication modem function for remote meter reading.

Here, the DERGW device may be in the form of a removable expansion card module that can be coupled to an expansion slot for a removable modem provided inside the enclosure of the SMGW device.

Here, the DERGW device may be in the form of an expansion card module that can be coupled to an expansion slot provided inside the housing of the integrated watt-hour meter.

Here, a vacuum circuit breaker (VCB) for blocking the connection between the inverter and the grid; And it may further include a transformer for converting the voltage of the power output from the inverter.

Here, it may further include a MOF for transmitting the scaled-down sensed value to the integrated watt-hour meter.

Here, the DERGW device, the integrated watt-hour meter device, the inverter, and the communication interface for forming a data communication channel with the DERMS server, respectively; a metering data collecting unit for collecting the sensed value from the integrated power metering device; a metering data transmitter for transmitting the sensed value as a DNP packet to the DERMS server; a protocol analysis unit for extracting values from information collected as DLMS packets or modbus packets; a protocol converter converting the extracted value into the DNP packet; a power factor control command receiving unit for receiving a power factor control instruction from the DERMS server; and a power factor control command transmitter configured to transmit a power factor control command determined according to the power factor control guideline and the sensed value to the inverter.

When the distributed power generation premises system and the integrated watt-hour meter for distributed power to which network separation is applied according to the spirit of the present invention of the above configuration are implemented, the statutory watt-hour meter used in the AMI is jointly utilized in the DERMS while satisfying the network separation security policy. There are advantages that can be

The integrated watt-hour meter for the distributed power generation premises system and distributed power to which the network separation according to the spirit of the present invention is applied minimizes the change in the HW configuration of the watt-hour meter to provide a watt-hour meter in which the services including the protocol are physically completely separated at a low cost, Ultimately, there is an advantage in that the watt-hour meter built in the AMI can be recycled in the DERMS to minimize the cost of measurement and monitoring of the distribution line.

1 is a configuration diagram for performing monitoring and control of an extra-high voltage (500 kW or more power generation company) distributed power that is built and operated.
2 is a configuration diagram showing a distributed power premises system for remote monitoring (monitoring) of distributed power for extra high voltage that can jointly utilize a legal watt-hour meter used in AMI according to the spirit of the present invention in DERMS.
3 is a configuration diagram for performing monitoring and control of a low-pressure (power generation customer less than 500 kW) distributed power that has been built and operated.
4 is a block diagram illustrating a distributed power premises system for remote monitoring (monitoring) of a distributed power source for low voltage that can jointly utilize a legal watt-hour meter used in AMI according to the spirit of the present invention in DERMS.
5 is a block diagram illustrating a DERGW built-in integrated power meter that can jointly utilize the legal power meter used in the AMI in DERMS by applying network separation.
6 is a block diagram illustrating an embodiment in which physical security is applied as a DERGW built-in integrated power meter that can jointly utilize the legal power meter used in the AMI in the DERMS by applying network separation.
7 is a functional block diagram illustrating an embodiment of a removable DERGW unit that may be included in the integrated power meter of FIG. 6 .

In describing the present invention, terms such as first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

When a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it can be understood that other components may exist in between. .

The terminology used herein is used only to describe specific embodiments, and is not intended to limit the present invention. The singular expression may include the plural expression unless the context clearly dictates otherwise.

In this specification, the terms include or include are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and includes one or more other features or numbers, It may be understood that the existence or addition of steps, operations, components, parts, or combinations thereof is not precluded in advance.

In addition, shapes and sizes of elements in the drawings may be exaggerated for clearer description.

1 shows a configuration diagram for monitoring and controlling an extra-high voltage (500 kW or more power generation operator) distributed power that is built and operated.

In FIG. 1 , the distributed power source 1500 refers to a power source such as solar power, wind power, or a fuel cell. An inverter 1600 for converting the power produced by direct current (DC) into alternating current (AC) is connected to the distributed power supply 1500, and for feeding (supplying) power to the extra-high voltage (22.9 kV) distribution line. A transformer 1700 serving to step-up a low voltage to an extra high voltage is connected in series with the inverter 1600 . VCB (Vacuum Circuit Breaker) (1800) is used as a protection device for the extra-high voltage distribution line, and performs a role of blocking the line by receiving the command of the relay. High-voltage watt-hour meters 1100 and 1120 are installed to measure the amount of electricity produced or consumed in the customer's premises of the extra-high voltage distributed power generation customer. The high-voltage watt-hour meters 1100 and 1120 are connected to the secondary side of the MOF 1010 (Metering Out Fit, consisting of CT/PT as a transformer for watt-hours).

Currently, the high-voltage watt-hour meter does not have a bidirectional (transmission and reception metering) metering function, so the watt-hour meter 1120 for transmission and the watt-hour meter 1100 for power-reception are installed and operated in parallel, respectively. The high-pressure remote meter reading modem 1400 is interlocked with the high-pressure remote meter reading server. The watt-hour meter 1120 for transmission of an extra-high voltage distributed power customer is managed by the Korea Power Exchange (KPX) 4500. As described above, in the case of currently distributed products, the power meter 1100 for power reception and the power meter 1120 for power transmission are separated, but in the future, a single high-voltage meter There is also a significant possibility that will support bi-directional metering (receiving and transmitting).

In DERMS (3000), a relay device is installed independently of the AMI to measure the voltage and current in the customer’s premises of the extra-high voltage distributed power generation from the secondary side of the VCB (1800). If the voltage rise on the distribution line is out of the allowable range, the voltage rise is suppressed through inverter power factor control (reactive power supply). In addition, the repeater 1200 communicates with a terminal device (FRTU) 2000 that performs switchgear monitoring control and transmits the measured values such as voltage and current measured from the VCB 1800 and after receiving commands such as power factor control , the inverter 1600 performs functions such as power factor control. That is, a separate voltage and current measuring device is provided in the VCB 1800 .

FIG. 2 shows a distributed power premises system for remote monitoring (monitoring) of distributed power for extra high voltage that can jointly utilize a legal watt-hour meter used in AMI according to the spirit of the present invention in DERMS.

The illustrated distributed power premises system includes: an integrated watt-hour meter device 100 that collects sensed values for calculating the amount of electricity, and packages the collected sensed values for the meter reading server 4000 and the DERMS server 3000, respectively; a meter reading modem device 400 for transmitting (forming a channel) the sensing value packaged in the integrated power meter device 100 to the meter reading server 4000; Distributed power source 500 for generating renewable energy or emitting stored electrical energy; an inverter 600 converting the power output from the distributed power supply and supplying it to the grid; and forms a channel for transmitting the sensed value received from the integrated watt-hour meter to the DERMS server, controls the operation of the inverter according to the sensed value and a guideline from the DERMS server, and is mechanically detachable from the integrated watt-hour meter It may include a DERGW device 200 that may be

The illustrated distributed power premises system is for extra-high voltage distributed power, and in order to boost the power generated from the distributed power supply 500, a VCB (Vacuum Circuit Breaker) that blocks the connection between the inverter 600 and the grid (800); a transformer 700 for converting a voltage of power output from the inverter 600; and MOF (Metering Out Fit, consisting of CT/PT as a transformer for watt-hour meter) that transmits the scaled-down sensed value to the integrated watt-hour meter device 100 to safely measure/meter the high-voltage power system (10) do.

2 shows a remote monitoring configuration and control method of an extra-high voltage distributed power supply using a watt-hour meter to which physical security is applied. The difference from FIG. 1 is that the integrated watt-hour meter device (100) is a legally standardized high-voltage watt-hour meter (meter) that legally guarantees accuracy, not the secondary side of the VCB, for measuring the voltage and current in the customer premises of the extra-high voltage distributed power generation required for DERMS (100). ) is obtained from

The DERGW (Distributed Energy Resource Gateway) device 200 communicates with the integrated watt-hour meter device 100 supporting physical security with a protocol agreed in advance such as modbus protocol and/or DLMS protocol, and from the integrated watt-hour meter device 100 It serves to convert the acquired measurement/measurement information into the modbus protocol and/or the DNP protocol used by the terminal device (FRTU) 2000 and transmit it.

In addition, the inverter power factor control command (specifically, a power factor control guideline indicating the direction of power factor control in a relatively long time period) is transmitted from the terminal device (FRTU) 2000 through the DNP protocol, and the modbus protocol used by most inverters and finally performs the function of controlling the power factor of the inverter. Depending on the implementation, the terminal device (FRTU) 2000 may control the power factor of the inverter 600 through the DERGW device 200 using the modbus protocol instead of the DNP protocol.

The meter reading modem device 400 supporting only a relatively simple additional function in addition to the communication modem function may be implemented as an internal hardware block of the integrated watt-hour meter device 100 . In this case, the meter-reading modem device 400 and the DERGW device 200 are inserted into the expansion slot in an expansion slot for performing a removable modem inside the housing of the integrated watt-hour meter device 100, respectively, in the form of a removable expansion card module. may be installed.

The integrated watt-hour meter device 100 and the DERGW device 200 may be physically integrated into one main body. To this end, the DERGW device 200 may be implemented in the form of a removable expansion card module that can be coupled to an expansion slot provided inside the housing (body) of the integrated watt-hour meter device 100 .

Meanwhile, the illustrated meter reading modem device 400 is implemented as an SMGW device supporting various Behind the Meter (BTM) services as well as a communication modem function for remote meter reading.

SMGW (Smart Metering Gateway) has a communication modem function for remote meter reading and a function to support various BTM (Behind the Meter) services such as DR (Demand Response). SMGW with multi-function can accommodate a removable modem to support various communication methods.

In this case, it is preferable from an installation point of view that the DERGW device 200 is implemented in the form of a removable expansion card module that can be coupled to the expansion slot inside the SMGW enclosure (body) having an expansion slot for a removable modem. can do. That is, although FIG. 2 shows the SMGW and the DERGW device 200 separately, when the SMGW supports multi-function and is implemented as a separate and independent hardware device from the integrated watt-hour meter device 100, the DERGW device 200 is located inside the SGMW. It can be detachably mounted.

In this case, the DERGW device 200 can easily solve the power problem by receiving DC power provided by the SMGW. Meanwhile, there is no need to communicate with each other in order to satisfy network separation between the SMGW and the DERGW device 200 . The detailed configuration and functions of the high-voltage watt-hour meter with enhanced physical security that do not communicate with each other will be described separately later.

3 shows a configuration diagram for monitoring and controlling low-pressure (power generation customers less than 500 kW) distributed power that is built and operated. An inverter 1602 for converting the power produced from the distributed power supply 1502 into direct current (DC) into alternating current (AC) is connected to the distributed power supply 1502, and a low voltage watt-hour meter that supports bidirectional measurement/metering ( 1102) to measure the amount of generation or the amount of electricity used in the premises. The low voltage meter reading server 4002 remotely reads each (transmission and reception metering values) power consumption by using a Data Concentration Unit (DCU, not shown) and the low voltage modem 1402 . DERMS (3002) uses the (low voltage) terminal device (2002) installed on the pole to measure and measure the voltage and current at the secondary side of the distribution transformer and monitor it. For), the power factor control for the inverter 1602 is performed through the terminal device 2002 .

4 shows a distributed power premises system for remote monitoring (monitoring) of a distributed power source for low voltage that can jointly utilize a legal watt-hour meter used in AMI according to the spirit of the present invention in DERMS.

The illustrated distributed power premises system includes an integrated watt-hour meter device 102 that collects sensed values for calculating the amount of electricity and packages the collected sensed values for the meter reading server 4002 and the DERMS server 3002, respectively; a meter reading modem device (402) for transmitting (forming a channel) the sensing value packaged in the integrated power meter device (102) to the meter reading server (4002); Distributed power source 502 for generating renewable energy or emitting stored electrical energy; an inverter 602 converting the power output from the distributed power source and supplying it to the grid; and forms a channel for transmitting the sensed value received from the integrated watt-hour meter to the DERMS server, controls the operation of the inverter 602 according to the sensed value and instructions from the DERMS server, and the integrated watt-hour meter ( 102) and a DERGW device 202 that is mechanically detachable.

4 shows a remote monitoring and control method of a low-voltage distributed power supply using a watt-hour meter to which physical security is applied. The difference from FIG. 3 is that the measurement and measurement of voltage and current in the premises of the low-voltage distributed power generation customer required in DERMS is obtained from the low-voltage integrated watt-hour meter device 102, which is legally guaranteed to be accurate, not from the secondary side of the transformer.

The DERGW (Distributed Energy Resource Gateway) device 202 communicates with the low-voltage integrated watt-hour meter device 102 with enhanced physical security using the modbus protocol or the DLMS protocol, and transmits the acquired measurement and metering information to the terminal device (FRTU) (2002). ) converts it to the DNP protocol or modbus protocol used by it and transmits it.

In addition, the inverter power factor control command (specifically, a power factor control guideline indicating the direction of power factor control in a relatively long time period) is transmitted from the terminal unit (FRTU) 2002 to the DNP protocol, converted into the modbus protocol, and finally the inverter It serves to control the power factor of (602). The terminal device (FRTU) 2002 may control the power factor of the inverter 602 through the DERGW device 202 using the modbus protocol instead of the DNP protocol.

The illustrated meter reading modem device 402 is implemented as an SMGW device supporting various BTM (Behind the Meter) services as well as a communication modem function for remote meter reading.

The meter reading modem device 402 supporting only a relatively simple additional function in addition to the communication modem function may be implemented as an internal hardware block of the integrated watt-hour meter device 102 .

The integrated watt-hour meter device 102 and the DERGW device 202 may be physically integrated into one main body. To this end, the DERGW device 202 may be implemented in the form of a removable expansion card module that can be coupled to an expansion slot provided inside the housing (body) of the integrated watt-hour meter device 102 .

Alternatively, the DERGW device 202 may be implemented in the form of a removable expansion card module that can be coupled to the expansion slot inside the SMGW enclosure (body) having an expansion slot for a removable modem.

5 is a block diagram illustrating a DERGW built-in integrated power meter that can jointly utilize the legal power meter used in the AMI in the DERMS by applying network separation.

The illustrated integrated watt-hour meter for distributed power includes: a sensing value input unit 120 for collecting a sensing (metering) value for calculating wattage; a metering unit 140 for calculating the amount of power and reflecting it as an instrument constant pulse; AMI processing unit 160 for supporting services that meet the communication and security requirements of the AMI; and a detachable DERGW unit 200 for converting a value required for distributed power generation control among the sensing values into a DERMS packet and transmitting it to the DERMS server.

5 shows the structure of an integrated watt-hour meter to which network separation is applied. The structure of the watt-hour meter proposed in FIG. 5 can be applied to configure the distributed power premises system shown in FIGS. 2 and 4 . That is, the integrated watt-hour meter shown in FIG. 5 can be applied as a premises system for a high-voltage distributed power supply or a premises system for a low-voltage distributed power supply. In this case, the DERGW device is built into the integrated watt-hour meter.

In addition, depending on the implementation, the basic products of the integrated watt-hour meter for high and low pressure are the same, but only the removable DERGW part that is built-in is divided/selected for high pressure and low pressure, and modularization and common use are promoted. can do. In addition, in the case of high pressure, a CT and PT are provided in the sensing value input unit 120 and a MOF that scales down high voltage power and reads the meter is connected, so there is a difference compared to the configuration of the premises system for low pressure.

The illustrated detachable DERGW unit 200 can be viewed as an added part for physical security for each service in the existing watt-hour meter. The basic idea of the present invention for the watt-hour meter is that the CT/PT (Current Transformer/Potential Transformer) unit, power supply, RTC, metering SoC unit, etc. are commonly used, and the AP (Application Processor) and communication interface are divided by service and independently to make it work This proposal can provide the advantage of supporting DERMS and AMI services by using one watt-hour meter without using each watt-hour meter for each service (requires installing two watt-hour meters) for physical network separation required for security.

In FIG. 5 , the sensing value input unit 120 adjusts the CT and PT sensing signals to the current/voltage size acceptable to the analog digital converter (ADC) of the metering unit 140 . The metering unit 140 may be composed of an ADC, a digital signal processing (DSP), and a micro controller unit (MCU). The ADC converts analog current/voltage values to digital, and the DSP converts digital current/voltage values. to perform basic calculations necessary for the watt-hour meter. The MCU codes and applies the necessary measurement and weighing operation algorithms in addition to the basic operations performed by the DSP.

This method is differentiated from the metering unit 140, and as the AMI processing unit 160, the AP (Application Processor) provides the advantage of allowing only the application service (functions such as communication/security) to be performed. That is, the AP can replace the function of the metering unit 140 and the MCU as the AMI processing unit 160, but in terms of updating the watt-hour meter firmware, it is preferable to separate the metrology role and the application service separately.

As the AMI processing unit 160, the AMI AP serves to support a service that meets the communication and security requirements of the AMI. It is desirable that the AMI AP must implement the packet generation and interpretation function of the DLMS protocol, which is a representative AMI protocol. The HW-based encryption module performs functions necessary for packet encryption, mutual authentication, key agreement, and digital signature generation and verification.

The AMI communication interface 168 may include a Wireless Smart Utility Network (WiSUN), a Controller Area Network (CAN), RS232/485, Power Line communication (PLC), LTE, and the like.

The AMI encryption module 169 has an encryption key corresponding to the meter reading servers 4000 and 4002 of FIG. 2 or 4, and uses this to encrypt data transmitted to the meter reading servers 4000 and 4002, or to can be decrypted.

The AP 260 for the illustrated detachable DERGW unit 200 serves to support a service that meets the communication and security requirements of the DERMS. It is desirable to implement the packet generation and interpretation functions of the Modbus protocol, which is a protocol widely used in DERMS, and the DLMS protocol, which is an AMI protocol, in addition.

The DER communication interface 220 may include WiSUN (Wireless Smart Utility Network), CAN (Controller Area Network), RS232/485, PLC (Power Line communication), LTE, etc., and the DER communication interface 220 is AMI It must be physically separated from the communication interface 168 to operate independently. The encryption module 250 is generally and preferably used independently, but in the case of an integrated watt-hour meter implemented with low-spec hardware for a small-scale distributed power supply, the encryption module may be shared with each other.

In the former case, the encryption module 250 for the DERGW unit 200 holds encryption keys corresponding to each other with the DERMS servers 3000 and 3002 of FIG. 2 or 4, and uses them to the DERMS servers 3000 and 3002 ) can be encrypted or decrypted.

In terms of measurement and weighing data, the integrity of the data used by AMI and DERMS is important. That is, it is necessary for the AMI AP 160 and the DERMS AP 260 to use the same effective wattage value for a specific metering item (eg, active wattage). Therefore, in the MCU of the metering unit 140, the algorithm for calculating the metering items required by the electric power company (KEPCO) is first applied and calculated, and the first applied and calculated values are applied to the AMI AP 160 and the DER AP. It is implemented in FIG. 5 so that 260 operates in a structure that is read and used.

It is preferable that the AP 160 for AMI and the AP 260 for DER perform packet generation and interpretation functions suitable for the protocol being used, with the measurement values collected (read) from the MCU of the metering unit 140, whereas , the method of additionally calculating the metric value in each AP is not preferable in terms of data integrity.

6 is a block diagram illustrating an embodiment in which physical security is applied as a DERGW built-in integrated power meter that can jointly utilize the legal power meter used in the AMI by applying network separation.

The illustrated integrated watt-hour meter for distributed power includes: a sensing value input unit 120 for collecting a sensing (metering) value for calculating wattage; a metering unit 141 that calculates the amount of power and reflects it as an instrument constant pulse; AMI processing unit 161 for supporting services that meet the communication and security requirements of the AMI; and a detachable DERGW unit 201 that converts a value necessary for distributed power generation control among the sensed values into a DERMS packet and transmits it to a DERMS server, wherein the AMI processing unit 161 converts the sensed value in the form of the DLMS packet. In the secure memory 211 , the removable DERGW unit 201 reads the DLMS packet recorded in the secure memory 211 , and extracts the sensed value from the DLMS packet.

6 is a structure in which a part of the structure of the watt-hour meter specified in FIG. 5 is modified. As the metering unit 141, a specific metering SoC chip can be utilized when a communication interface that can be used by two or more APs cannot be provided. In the above case, as indicated in FIG. 6 , when a single communication interface is provided, the secure memory 211 is shared between the AMI AP and the DER AP.

The illustrated secure memory 211 is mounted on hardware (eg, an expansion card module) constituting the removable DERGW unit 201 , but in other implementations, it may be a separate memory hardware separate from the removable DERGW unit 201 . .

AP 161 for AMI as the metering unit 141 has the authority to write only the metering data obtained from the metering SoC chip to a secure memory 211, and the AP 261 for DER is secure. ) If implemented so as to have the authority to perform only read from the memory 211 , it operates as if physically separated between the two APs 161 and 261 , and physical security and network separation conditions can be further strengthened.

7 illustrates an embodiment of a removable DERGW unit that may be provided in the integrated watt-hour meter of FIG. 6 .

The illustrated detachable DERGW unit includes: a communication interface 221 for forming a data communication channel with the integrated watt-hour meter, the inverter, and the DERMS server, respectively; a metering data collecting unit 262 for collecting the sensed value from the integrated power metering device; a metering data transmission unit 263 for transmitting the sensed value as a DNP packet to the DERMS server; a protocol analysis unit 264 for extracting a value from information collected in a DLMS packet (format) or modbus packet (format); a protocol conversion unit 265 for converting the extracted value into the DNP packet; a power factor control command receiving unit 266 for receiving a power factor control instruction from the DERMS server; and a power factor control command transmission unit 267 for transmitting a power factor control command determined according to the power factor control guideline and the sensed value to the inverter.

FIG. 7 does not represent the hardware components of the removable DERGW unit, but shows functional blocks for indicating the operation. Accordingly, the interface unit 221 of FIG. 7 corresponds to the DER communication interface 221 of FIG. 6 , the measurement data collection unit 262 , the measurement data transmission unit 263 , the protocol analysis unit 264 of FIG. 7 , The protocol converter 265 , the power factor control command receiver 266 , and the power factor control command transmitter 267 may be software blocks formed in the DER AP 261 of FIG. 6 .

The illustrated detachable DERGW unit supports various communication methods to communicate with the FRTU, the watt-hour meter, and the inverter, respectively. Communication methods may include WiSUN (Wireless Smart Utility Network), CAN (Controller Area Network), RS232/485, PLC (Power Line communication), LTE, e-WSN (energy Wireless Sensor Network, KEPCO’s wireless communication method), etc. can The metering data collection unit 262 collects metering data periodically (for example, at intervals of 1 second) by using the communication interface and the mutually agreed protocol used in the electricity meter. Representative protocols supported by the watt-hour meter may be DLMS and modbus. The measurement data collection unit 262 transmits the collected measurement data to the protocol analysis unit 264 .

The protocol interpretation unit 264 performs parsing (decoding) according to a corresponding protocol. The analyzed measurement data is transmitted to the protocol conversion unit 265 . The protocol conversion unit 265 may perform protocol conversion such as DLMS↔DNP, modbus↔DNP, and modbus↔DLMS.

The measurement data transmission unit 263 may transmit the measurement data converted to the DNP protocol by the protocol conversion unit 265 to the FRTU through a communication interface for FRTU transmission.

When the power factor control command receiving unit 266 receives the DNP protocol (modbus protocol is also possible) power factor control command packet through the FRTU communication interface, it transmits it to the protocol analysis unit 264 . The protocol analysis unit 264 interprets the DNP protocol and then converts it to the modbus protocol used by the inverter.

The power factor control command transmission unit 267 transmits the power factor control command converted into the modbus protocol by the protocol analysis unit 264 to the inverter through the inverter communication interface to perform power factor control.

Those skilled in the art to which the present invention pertains should understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof, so the embodiments described above are illustrative in all respects and not restrictive. only do The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

10: MOF (Metering Out Fit) 100: Integrated power meter device
120: sensing value input unit 140, 141: metering unit
160, 161: AMI processing unit 169: encryption module
168: AMI communication interface 200, 202: DERGW device
220, 221: DER communication interface 211: secure memory
250, 251: Cryptographic module 260, 261: AP for DERMS
400, 402: meter reading modem device 500, 502: distributed power
600, 602: inverter 700: transformer
800: VCB (Vacuum Circuit Breaker) 2000, 2002: Terminal Equipment (FRTU)
3000, 3002: DERMS Server 4000, 4002: Meter Reading Server

Claims (14)

a sensing value input unit for collecting a sensing value for calculating the amount of electricity;
a metering unit that calculates the amount of power and reflects it as an instrument constant pulse;
AMI processing unit that supports services that meet the communication and security requirements of the AMI; and
A detachable DERGW unit that converts a value required for distributed power generation control among the sensing values into a DERMS packet and transmits it to the DERMS server
An integrated watt-hour meter for distributed power sources that includes.
According to claim 1,
The removable DERGW unit,
An integrated watt-hour meter in the form of an expansion card module that can be coupled to an expansion slot provided inside the housing of the integrated watt-hour meter.
According to claim 1,
The removable DERGW unit,
An integrated watt-hour meter equipped with one selected from a removable DERGW part for high-voltage distributed power and a removable DERGW part for low-voltage distributed power.
According to claim 1,
The sensing value input unit,
An integrated watt-hour meter that has CT and PT and is connected to the secondary side of the MOF that scales down the high-voltage power and reads the meter.
According to claim 1,
An integrated watt-hour meter that transmits the sensed value from the metering unit to the detachable DERGW unit.
According to claim 1,
The AMI processing unit records the sensed value in the secure memory in the form of the DLMS packet,
The detachable DERGW unit reads the DLMS packet recorded in the secure memory and extracts the sensed value from the DLMS packet.
The method of claim 1,
The removable DERGW unit,
a communication interface for forming a data communication channel with the integrated watt-hour meter, the distributed power inverter, and the DERMS server, respectively;
a metering data collection unit for collecting the sensed value from the integrated power meter;
a metering data transmitter for transmitting the sensed value as a DNP packet to the DERMS server;
a protocol analysis unit for extracting values from information collected as DLMS packets or modbus packets;
a protocol converter converting the extracted value into the DNP packet;
a power factor control command receiving unit for receiving a power factor control instruction from the DERMS server; and
A power factor control command transmission unit for transmitting a power factor control command determined according to the power factor control guideline and the sensed value to the inverter
An integrated watt-hour meter with
an integrated watt-hour meter device that collects the sensed values for calculating the amount of electricity, and packages and transmits the collected sensed values to the meter reading server and the DERMS server, respectively;
a meter reading modem device for forming a channel for transmitting the sensed value packaged in the integrated power meter device to the meter reading server;
Distributed power to generate electricity from renewable energy or to emit stored electrical energy;
an inverter converting the power output from the distributed power source and supplying it to the grid; and
Forms a channel for transmitting the sensed value received from the integrated watt-hour meter device to the DERMS server, controls the operation of the inverter according to the sensed value and a guideline from the DERMS server, and the integrated watt-hour meter device or the meter-reading modem device and mechanically removable DERGW device
Distributed power premises system to which network separation is applied.
9. The method of claim 8,
The meter reading modem device,
A distributed power premises system that is an SMGW device that supports various BTM (Behind the Meter) services as well as a communication modem function for remote meter reading.
10. The method of claim 9,
The DERGW device,
A distributed power premises system in the form of a removable expansion card module that can be coupled to an expansion slot for a removable modem provided inside the enclosure of the SMGW device.
9. The method of claim 8,
The DERGW device,
A distributed power premises system in the form of an expansion card module that can be coupled to an expansion slot provided inside the housing of the integrated power meter.
9. The method of claim 8,
VCB (Vacuum Circuit Breaker) for blocking the connection between the inverter and the system; and
A transformer that converts the voltage of the power output from the inverter
A distributed power premises system further comprising a.
13. The method of claim 12,
MOF that transmits the scaled-down sensed value to the integrated watt-hour meter
A distributed power premises system further comprising a.
10. The method of claim 9,
The DERGW device,
a communication interface for forming a data communication channel with the integrated watt-hour meter device, the inverter, and the DERMS server, respectively;
a metering data collecting unit for collecting the sensed value from the integrated power metering device;
a metering data transmitter for transmitting the sensed value as a DNP packet to the DERMS server;
a protocol analysis unit for extracting values from information collected as DLMS packets or modbus packets;
a protocol converter converting the extracted value into the DNP packet;
a power factor control command receiving unit for receiving a power factor control instruction from the DERMS server; and
A power factor control command transmission unit for transmitting a power factor control command determined according to the power factor control guideline and the sensed value to the inverter
A distributed power premises system comprising a.

Images