KR101082505B1 - Remote metering system grid-connected - Google Patents

Abstract

PURPOSE: A grid connected remote metering system is provided to efficiently use energy by remotely measuring and displaying electricity, heating, water service, gas, and warm water for a consumer in real time. CONSTITUTION: A gateway(200) collects measured data. A display unit(400) displays the measured data. A storing unit(31) stores an error correction data for the measured data and the measured data. A metering server(30) compares the actual measurement value of a voltage, a current, and power data, which are stored in the storing unit, with the error correction data which is stored in the storing unit. The metering server produces a compensated value for the actual measurement value and corrects the error of the measured data which adds or subtracts the actual measurement value and the compensated value.

Description

Grid-connected remote weighing system {REMOTE METERING SYSTEM GRID-CONNECTED}

The present invention relates to a system-linked remote metering system, and more particularly to a system-linked remote metering system capable of remotely metering the amount of heating, water, gas and hot water as well as the amount of power in both transmission and reception.

Until now, utilities have maintained passive relationships as a service provider that simply supplies electricity to consumers. However, as power usage has grown exponentially, the need for self-generating systems has increased in each home. If such a system is built, a grid-connected remote metering system that links the existing grid and self-generating systems is needed.

In addition, unlike the conventional metering unit that merely measures the power supply amount, under the grid-linked remote metering system as described above, it is difficult to build a metering system that reflects the amount of use of the self-generating system provided in each household in the amount of supply in the power system that is constantly changing. need.

Therefore, in order to properly operate the power system, it is necessary to accurately and quickly the power transmission / reception bi-directional power measurement.

However, the electricity meter according to the conventional invention only displays the accumulated amount of power in one direction, and therefore, a separate electricity meter is required to display the amount of power consumed in real time as well as the accumulated amount of power in both transmission and reception directions. The situation was using the electricity meter. Therefore, there was a dispute in the calculation of power transmission amount due to the error of each meter by using a separate power meter for the measurement of power amount before transmission, and there existed problems in operation due to the installation of a separate meter.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is to remotely and in real time by measuring the amount of power used in the transmission power and heating, water, gas and hot water from power reception and self-generation from the power system It is to provide a grid linked remote weighing system that can be displayed.

Another object of the present invention is to provide a system-linked remote metering system that can measure the exact amount of power by correcting in real time the measurement error of the received power from the power system and the transmitted power from self-power generation.

Grid-connected remote metering system according to the present invention, not only to measure the voltage, current and power transmitted through the power system and the voltage, current and power transmitted through self-generation, but also to measure heating, water, gas and hot water. A system-linked remote weighing system, comprising: a gateway for collecting the metered data, a display for displaying the metered data, and a storage for storing error correction information for the metered data and the metered data And receiving data measured by the gateway to correct an error by using error information stored in the storage unit, controlling the data measured by the gateway to be stored in the storage unit, and storing the data stored in the storage unit in the display unit. Characterized in that it comprises a metering server to control to be displayed on.

In addition, the gateway collects the metered data, and encrypts the metered data for each customer and delivers the metered server.

In addition, the metering server calculates the billing status by weighting each of the power received in the power system and the power transmitted through self-generation, or calculates the billing status for the metered power by weighting the weight according to the type of customer. It is characterized by.

The metering server may be configured to accumulate the amount of power, heating, water, gas, and hot water used at predetermined time units, and store the amount of the power, heating, water, gas, and hot water in the storage unit.

In addition, the metering server compares the measured voltage, measured current, and various measured power information stored in the storage unit with error correction information stored in the storage unit, calculates an adjustment value for the measured value, and adds and subtracts the adjusted value to the measured value. The error is corrected for the data.

The adjustment value may be an error value of power measured with respect to a specific current value, and the adjustment value may be collectively added or subtracted to correct it.

In addition, the adjustment value is an error value of the power set in advance for each current section, characterized in that for each section is adjusted by adding or subtracting the adjustment value.

The adjustment value is a continuous value calculated from the change amount of the current versus the change in power error of each current section, and the adjustment value is collectively added or subtracted for correction.

In addition, the system-linked remote metering system further includes an integrated metering unit including a power measuring unit, a water measuring unit, a gas measuring unit, a heating measuring unit, and a hot water measuring unit capable of measuring power, water, gas, heating, and hot water, respectively. Including, the power measuring unit measures the voltage, current and power received in the power system and the voltage, current and power transmitted through self-generation, the water measuring unit detects the flow rate and water quality of the tap water and corresponding signals The gas measuring unit detects the flow rate of the gas, and outputs a signal corresponding thereto. The heating measuring unit detects the flow rate of the heating water and the temperature of the conduit and outputs a signal corresponding thereto. Detects the temperature and flow rate of the output signal characterized in that corresponding.

In addition, the power measurement unit, the phase of the power using the effective power / frequency conversion means for outputting data proportional to the effective amount of power of each of the transmission power or the power distribution, the phase shifted by 90 ° with respect to the voltage of the transmission power or the power distribution Reactive power / frequency converting means for outputting data proportional to the amount of reactive power of each of the leading or phase delays, phase converting means for converting the voltage phase of the transmission or receiving power by 90 °, and data output from the effective power / frequency converting means. And a flow direction discrimination means for discriminating whether the output of the reactive power / frequency converting means is a transmission / phase lead, transmission / phase delay, faucet / phase lead, or faucet / phase delay from data output from the reactive power / frequency converting means. It is characterized in that it further comprises.

According to the system-linked remote metering system according to the present invention configured as described above, it is possible to remotely measure the power, heating, water, gas and hot water and to display it in real time to the customer, enabling efficient energy use, use It is possible not only to measure the power quickly and accurately by correcting the error of various specialized powers according to the environment, but also to transmit / receive transmission / receiving power and active power / reactive power through external communication means. Power operation is possible.

1 is a diagram illustrating a system-linked remote weighing system according to an exemplary embodiment of the present invention.
2 is a view showing a power measurement unit of the grid-associated remote metering system according to the present invention.
3 is a diagram illustrating an error characteristic curve of a wattmeter according to an exemplary current change amount.
4 is a diagram illustrating an embodiment of correcting an error in a system-linked remote weighing system according to the present invention.
5A is a diagram illustrating another embodiment of correcting an error in a system-linked remote weighing system according to the present invention.
FIG. 5B is a diagram illustrating a table illustrating error correction information of FIG. 5A.
Figure 6a is a view showing another embodiment for correcting the error in the system-linked remote weighing system according to the present invention.
FIG. 6B is a diagram illustrating a process of calculating the adjustment value in the vector format of FIG. 6A.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a system-linked remote weighing system according to an exemplary embodiment of the present invention. As shown in FIG. 1, the system-linked remote metering system according to an exemplary embodiment of the present invention measures the amount of power received in the power system 10 and the power transmitted by self-generated in the customer 20. ) Can be metered remotely. The illustrated metering server 30 controls the metered data to be stored and corrects the error of the stored data. In addition, the storage unit 31 for storing the measurement value and the error correction information for the measurement value may be further provided.

The customer 20 refers to a plurality of group residences 20a, 20b, 20c,... Composed of a plurality of households N1, N2,... The collective residence may be provided with a common self-generation system 100. The common self-generation system 100 supplies power to each of the plurality of generations N1, N2,... Using wind, solar light, and the like. In addition, each generation N1, N2,... Includes a gateway 200, an integrated weighing unit 300, and a display unit 400.

The gateway 200 transfers the metering data metered by the integrated metering unit 300 to the metering server 30. The transmission of the weighing data is possible through a known wired or wireless communication method, wired communication methods such as home PNA, Ethernet, power line communication, IEEE1394, HomeRF, RS-485, and wireless communication methods such as WLAN, infrared communication, Bluetooth, etc. It is possible. In addition, the gateway 200 may communicate in an encrypted manner in order to protect personal information of each generation (N1, N2, ...). As an encryption method, a public key certificate (PKI) is used to encrypt transmission and reception data using a public key composed of a decryption key and authenticates a user through a digital certificate, which is client software, and a client application that performs private key and certificate management. The authentication method used can be used. In addition, the gateway 200 receives the information such as real-time usage, accumulated usage, such as power, gas, water from the metering server 30, and transfers the information to the display unit 400 to view the data through the display unit 400. Can be.

The integrated metering unit 300 measures the amount of power, heating, water, gas and hot water, etc., using the power measuring unit 310, the water measuring unit 320, the gas measuring unit 330, and the heating measuring unit 340. And hot water measuring unit 350.

The power measuring unit 310 is configured to include a current sensor is installed on the power line that is drawn to the customer to detect the current value and output an electrical signal corresponding thereto. The current sensor is a typical CT (Current Transformer) sensor, and any other type of sensor may be selected. The power measuring unit 310 may be equipped with the fuel provided in the common self-power generation 100 provided in each of the customers 20a, 20b, ..., or each generation N1, N2, ..., as well as the amount of power received from the power system 10. The amount of power transmitted by power generation through the battery 500 and the power consumption of each generation N1, N2,...

The water measuring unit 320 is configured to include a water flow sensor installed in the water pipe to detect the flow rate of the tap water and outputs an electrical signal corresponding to the water and a water quality sensor for measuring the information of the water quality and outputs an electrical signal corresponding thereto. . The flow sensor may be a sensor of various sensing types such as an electronic flowmeter, a volumetric flowmeter, an ultrasonic flowmeter. Tap water quality measurement items can be nitrogen content, hydrogen ion concentration (pH), dissolved oxygen (DO), which is the amount of oxygen dissolved in water, and the water quality sensor can be selected accordingly.

The gas measuring unit 330 is configured to include a flow rate sensor installed in the gas pipe detects the flow rate of the gas and outputs an electrical signal corresponding thereto. As a flow sensor, various sensing types of sensors such as an electromagnetic flowmeter, a volumetric flowmeter, and an ultrasonic flowmeter can be adopted. However, since the gas is a gas, a more suitable sensor can be selected.

The heating measuring unit 340 is installed in the heating hot water pipe to detect the flow rate of the heating hot water and outputs an electrical signal corresponding to the flow sensor and supply side conduit and recovery side conduit respectively to detect the respective temperatures and It may include a temperature sensor for outputting a corresponding signal and a flow rate sensor for detecting the flow rate of hot water and outputs an electrical signal corresponding thereto.

The hot water measuring unit 350 is configured to include a flow rate sensor installed in the hot water pipe to detect the flow rate of the hot water and output an electrical signal corresponding to it and a temperature sensor for sensing the temperature of the hot water and outputs an electrical signal corresponding thereto. do. The flow sensor can be used as a sensor of various sensing types. As the temperature sensor, various sensing types such as thermistor and thermocouple can be used.

Meanwhile, the power measuring unit 310 may measure and output power data including voltage, current, power transmission, power reception, instantaneous power, or active power with respect to the power transmission component and the power distribution component. To this end, the power measuring unit 310, as shown in Figure 2 active power / frequency conversion means 311 for outputting data in proportion to the effective amount of each of the transmission power or the power distribution, the power of the transmission or power distribution Reactive power / frequency converting means 312 for outputting data proportional to the amount of reactive power of each of the phase leading or phase delay using the phase-converted voltage of 90 ° with respect to the voltage, and the voltage phase of the transmission or receiving power is 90 °. The output of the reactive power / frequency converting means 312 from the phase output means for converting 313, the data output from the effective power / frequency converting means 311, and the data output from the reactive power / frequency converting means 312. And a bird flow direction discrimination means 314 for distinguishing whether the power transmission / phase leading edge, the power transmission / phase delay, the power reception / phase leading edge, or the power reception / phase delay is included.

The effective power / frequency converting means 311 calculates a power value by multiplying a voltage of a transmission power or a power distribution and a current, and transmits the power value to the current direction determining means 314.

The reactive power / frequency converting means 320 calculates the power value by multiplying the voltage value of the voltage A / D converting part 210 by 90 ° phase and the current value using the phase converting means 313 to calculate the power value. It passes to the discriminating means 314.

The flow direction determining means 314 may receive the output of the active power / frequency conversion means 311 and the reactive power / frequency conversion means 312 to determine whether the transmission / reception power and the amount of reactive power and active power. have. The detailed principle thereof is described in Japanese Patent No. 3544466, so a detailed description thereof will be omitted.

The active power, reactive power, and power transmission / reception power values determined from the flow direction determination means 314 are transmitted to the metering server 30 through the above-described wired or wireless communication. The metering server 30 receives the values to calculate real time or cumulative power. Active power, reactive power, transmission power, and power reception power may be separately calculated for the cumulative power, and the separately calculated values may be stored in the storage unit 31 through an error correction process.

On the other hand, the metering server 30 may correct the error that may occur in the measurement by controlling the data display interval of the power measuring unit 310. The error correction is performed by comparing the measured voltage, the measured current, and the various measured power information stored in the storage unit 31 with the error correction information stored in the storage unit 31 to calculate an adjustment value for the measured value and to adjust the measured value. This is done by adding and subtracting the value.

3 is a diagram illustrating an error characteristic curve of a wattmeter according to an exemplary current change amount. The horizontal axis represents an operating condition according to the load current, and the vertical axis represents an error (shown as an offset in the drawing) between the power value calculated according to the current measured from the A / D converter 200 and the actually measured power value.

As shown in FIG. 4, the error exists in the entire section of the current measured from the power system. The specific error correction method is as follows.

As a first example of correcting an error, there is a method of collectively correcting an error of data as illustrated in FIG. 4. In other words, by adjusting the error value of the power measured for a specific operating condition as an adjustment value, the adjustment value is collectively added or subtracted and corrected. The specific operating condition may be a specific current value, and the specific current value may be arbitrarily set by a user or set according to a separate standard rule. According to this first embodiment, since the measurement of power and the error correction speed of the measured power are fast, it can be used when the electricity meter operates under a specific operating environment.

As a second embodiment, as shown in FIG. 5A, there is a method of correcting an error value of power using a preset data table for various operating conditions represented by a load current. An example of a data table is shown in FIG. 5B and such error correction data can be calculated by repeated experiments.

The application section of Figure 5b is based on the current, a, b, c, d, e, etc. means the load current, which means the respective operating conditions. The unit is not specified separately and may take a general constant value or may be a value calculated in advance in the metering server 31.

The error data for each range, which is an error adjustment value (shown as Offset in the drawing) during transmission of electric power according to the current section, can be obtained by comparing the grid-connected remote metering system with a standard electricity meter used for error correction of the electricity meter. . In an embodiment of the present invention, the error adjustment values during power transmission in the ab, bc, cd, and de sections are A, B, C, and D, respectively, and the error adjustment values (shown as Offset in the drawing) are ab, bc, cd, and de In the section, A ', B', C ', D', respectively, and the unit is not specified separately and may take a general constant value or may be a value calculated in advance in the metering server 30. That is, when the current value at the time of receiving the value of the ab section, the error is A ', so that the metering server 30 is corrected by the error A' to the effective power amount value measured by the power measuring unit 310 and stored in the storage unit 31 do. This process applies to both transmission and transmission, and can be applied to other types of power value calculation processes as well as the active power calculation process. According to this embodiment, it is possible to secure the precision of the power measuring unit 310 by adjusting the number of measurement, and there is an advantage that it is possible to secure stable precision even if the magnitude of the power before and after transmission.

As a third embodiment, there is a method of correcting data in a vector manner as shown in FIG. 6A. The calculation of the vector is shown in FIG. 6B, and when the section a-b of FIG. 6A is exemplarily described, an adjustment value of the vector type calculated from the change amount of the load current versus the change amount of the power error in the section may be calculated. When the adjustment value of the vector type is calculated, the corrected power data may be calculated by adding or subtracting the calculated adjustment value of the vector type in each load current section.

Using these three embodiments, it is possible to ensure high data reliability with a relatively small number of measurements. Such an embodiment may be used when there is a certain tendency in the characteristics of the metering unit and the environment change is not large after the system-associated remote metering system is installed.

The display unit 400 is for displaying information on the power, water, gas, heating and hot water measured by the integrated meter 300 to the outside. In particular, the power measurement unit 310 may display the voltage, current, transmission power, power receiving power, instantaneous power, or cumulative power up to a specific time point. In addition, the amount of power consumed instantaneously as well as the cumulative amount of power can be displayed in real time, the amount of power received through the power system 10 and the amount of transmission power supplied from the common self-generation 100 or the fuel cell 500 for each time zone. The amount of power actually charged can be displayed separately. In addition, the amount of power charged can be summed up by a predetermined unit time to indicate the amount of power in a form of increase and decrease, thereby enabling accurate monitoring of power consumption for each time zone. To this end, the metering server 30 may accumulate data on the amount of power, water, gas, etc. measured in real time by the integrated metering unit 300 to calculate the accumulated amount of use for each unit of time and display it on the display unit 400. .

In addition, the display unit 400 may weight the amount of power received or transmitted to each generation N1, N2, ..., so that the billing system construction considering the difference in the rate of the received power and the transmitted power is different. Likewise, it is possible to build a billing system that can apply different rates for each type of power generation by giving weight to the type of public self-power generation or the individual self-power generation type.

In addition, the display unit 400 can display the power consumption and the billing status according to each household, each residential group, or a predetermined region, and can easily determine whether the usage of each household exceeds the standard usage.

In the above described exemplary embodiments of the present invention by way of example, the scope of the present invention is not limited only to this specific embodiment and those skilled in the art within the scope of the claims of the present invention Changes may be made as appropriate.

10: power system 20: customer
30: metering server 200: gateway
300: integrated measurement unit 400: display unit

Claims (10)

In the grid-connected remote metering system that not only measures the voltage, current and power received from the power system and the voltage, current and power transmitted through self-generation, but also can measure heating, water, gas and hot water.
A gateway for collecting the metered data;
A display unit for displaying the measured data;
A storage unit capable of storing the measured data and error correction information on the measured data;
Receiving data measured by the gateway to correct the error using the error information stored in the storage unit, and controls the data metered from the gateway to be stored in the storage unit, the data stored in the storage unit to the display unit A metering server controlling to be displayed;
System-linked remote weighing system, characterized in that comprises a. The metering server,
The measured value of the voltage, current and power information stored in the storage unit is compared with the error correction information stored in the storage unit to calculate an adjustment value for the measured value, by adding or subtracting the adjusted value to the measured value to correct the error for the measured data. But
The metering server,
The measured value of the voltage, current and power information stored in the storage unit is compared with the error correction information stored in the storage unit to calculate an adjustment value corresponding to the change tendency of the measured value, and then measured by adding or subtracting the calculated adjustment value to the measured value. A system-linked remote weighing system, characterized in that it corrects errors for data.
The method of claim 1,
The gateway is,
Collecting the measured data, the system-associated remote weighing system, characterized in that for encrypting the metered data for each customer and forwarded to the metering server. The method of claim 1,
The metering server,
The billing status is calculated by weighting each of the power received in the power system and the power transmitted through self-generation, or the billing status is calculated for the metered power by weighting it according to the type of customer. Type remote weighing system. The method of claim 1,
The metering server,
Grid-based remote metering system characterized in that the amount of power, heating, water, gas and hot water consumption is accumulated every predetermined time unit and stored in the storage unit. delete The method of claim 1,
The adjustment value is an error value of power measured for a specific current value,
A system-linked remote weighing system, characterized in that the adjustment value is added or subtracted collectively. The method of claim 1,
The adjustment value is an error value of a preset power for each current section,
The system-linked remote weighing system, characterized in that for each section by adding or subtracting the adjustment value. The method of claim 1,
The adjustment value is a continuous value calculated from the amount of change in current versus the amount of power error in each current section,
A system-linked remote weighing system, characterized in that the adjustment value is added or subtracted collectively. The method of claim 1,
The grid linked remote weighing system,
Each of the power, water, gas, heating and hot water measuring unit, water measuring unit, gas measuring unit, and further includes an integrated measuring unit including a heating measuring unit and hot water measuring unit,
The power measuring unit measures the voltage, current and power transmitted by the power system and the voltage, current and power transmitted through self-generation,
The water measuring unit detects the flow rate and the water quality of the tap water and outputs a signal corresponding thereto,
The gas measuring unit detects the flow rate of the gas, and outputs a signal corresponding thereto,
The heating measuring unit detects the flow rate of the heating water and the temperature of the conduit and outputs a signal corresponding thereto,
The hot water measuring unit detects the temperature and flow rate of the hot water and outputs a signal corresponding thereto. 10. The method of claim 9,
The power measuring unit,
Active power / frequency converting means for outputting data proportional to the amount of effective power of each of the transmission power and the power distribution;
Reactive power / frequency converting means for outputting data proportional to the amount of reactive power of each of the phase leading or phase delay using a voltage 90 ° phase-converted with respect to the voltage of the power transmission component or the power distribution component;
Phase conversion means for converting a voltage phase of the power transmission component or the power distribution component by 90 degrees;
From the data output from the active power / frequency converting means and the data output from the reactive power / frequency converting means, the output of the reactive power / frequency converting means is transmitted / phase-leading, power-phase / phase-delay, faucet / phase-leading, or faucet / Flow direction discrimination means for discriminating whether the phase is delayed;
System-associated remote weighing system, characterized in that further comprises.

Images