KR20010087599A - System for controlling power supply - Google Patents

Abstract

PURPOSE: An electric power control system is provided to manage loading efficiently according to the pattern analysis of the electric power consumption and to supply a radio two directional communication module, which is necessary for the radio control and the remote control. CONSTITUTION: The electric power control system includes an RF signal detecting instrument(1), an electric power detecting instrument(2), a load control shortage module(3), a system controller(4) and a power supplying instrument(5). The RF signal detecting instrument(1) detects the RF signal, which flows in from the outside. The electric power detecting instrument(2) detects flowing of the load current and converts it into the consumed power quantities. The load control shortage module(3) shorts and connects loading. The system controller(4) controls the operation of the system and stores the gained data. The power supplying instrument(5) supplies the electric power to the RF signal detecting instrument(1), the electric power detecting instrument(2), the load control shortage module(3) and the system controller(4).

Description

Power Control System {System for controlling power supply}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control system, and more particularly to a power control system of a wattmeter having functions of remote power consumption metering and remote short circuit and load control.

In recent years, as the scale of industrialization and informatization increases and the speed thereof increases, power consumption is increased to an enormous scale and efficient load management is required.

For example, KEPCO's hourly rate system and individualization and competition of electric power supply and demand due to privatization have emerged to make more efficient use of electric power resources, and the efficient operation of electric power, a national resource, has emerged as an important issue. to be.

However, currently used wattmeters replace the analog power integration function with a simple digital power integration function. However, since such a conventional digital electricity meter has only a power integration function, load management according to an increase in power consumption is not efficiently performed.

In addition, for the efficient operation of electric power, a remote opening and closing function is required to cut off the load power remotely, but since the distribution of electricity meters that satisfy these requirements is not made, it is difficult for the national power policy to be closely reflected in the industrial site. It is true.

Accordingly, an object of the present invention is to provide a power control system capable of efficient load management operation according to power consumption pattern analysis.

In addition, another object of the present invention is to provide a wireless control module and a wireless two-way communication module required for the remote meter reading and co-operation with the remote power control system by RF (Radio Frequency) signal operated by the Korea Electric Power Demand Management Office The purpose is to provide a configured power control system.

The power control system according to the present invention for achieving the above object is an RF signal detection means for detecting an RF signal flowing from the outside, a power detection means for detecting the flow of the load current and converting it into the amount of power required; A load control short circuit module for shorting and connecting the load, a system controller for controlling the operation of the system and storing the obtained data, and supplying power to the load control shorting module, the power detecting means, the RF signal detecting means, and the system controller. It comprises a power supply means for supplying, characterized in that to perform the remote meter reading, remote short-circuit control function and load control function of the digital electricity meter.

1 is a block diagram of a power control system according to an embodiment of the present invention.

FIG. 2 is a detailed circuit diagram of the load control short circuit module of FIG. 1. FIG.

<Description of the symbols for the main parts of the drawings>

1: RF signal detecting means 2: Power detecting means

3: Load control short circuit module 4: System controller

5: power supply means

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

1 is a block diagram of a power control system according to an embodiment of the present invention, the RF signal detecting means (1) for detecting the RF signal flowing from the outside, the flow of load current is detected and converted into the amount of power required Power detection means 2, load control short-circuit module 3 for short-circuit and connection of load, system controller 4 for controlling the operation of the system and storing the obtained data, and the RF signal detection means ( 3) a power detecting means 2, a load control short circuit module 3 and a power supply means 5 for supplying power to the system controller 4;

First, the operation of the RF signal detecting means 1 will be described.

The RF signal detecting means 1 is a module that is encoded by a Post Office Code Standardization Advisory Group (POSCAG) format using a frequency in the UHF band of 322.1 MHz to 328.6 MHz, and is a module that receives an FSK-NRZ modulated signal. Decode the double heterodyne data by S-7041B of Seiko Instruments Co., Ltd., which is a decoding device for POCSAG, and induces a bufferful signal in the interrupt buffer of the MPU 41 of the system controller 4. It is a device that supplies transmission numeric data.

The RF signal detecting means 1 includes an antenna 10, an impedance matching unit 11, an amplifier 12, a band pass filter 13, and a band pass filter 13 for receiving an RF pager signal. Mixer 14, filter 15, RF signal detector 16, voltage regulator 17, demodulator 18 and RF modem transceiver 19 which mix the passed RF pager signal and PLL sync signal It consists of.

Since the antenna 10 is composed of a small loop antenna, the antenna 10 is designed to match the polarization characteristic of the field, and the tuning frequency is adjusted by a capacitor.

The RF amplifier 11 which amplifies the signal loaded by the antenna 10 uses two high-frequency transistors, and at the same time, the band pass filter 13 removes the suppression of the video signal and other disturbing signals.

On the other hand, the PLL synthesizer 101 provided in the RF signal detecting means 1 is used for first-order converting the band pass signal and the signal generated by the local oscillation circuit 102 to a frequency specified by the PLL. The PLL synthesizer 101 uses an SM series manufactured by Nippon Precision Circuit Inc. (NPC).

For example, five local frequencies currently used in Korea: 325.025 MHz (Jeonbuk, Seoul), 323.300 MHz (Gyeongbuk), 323.75 MHz (Chungnam, Jeju), 322.600 MHz (Gangwon), 322.125 MHz (Chungbuk, Jeonnam) In consideration of the received signal frequency of the SM5165 device, the frequency (frequency devide) and then converted to the first frequency of 21.6MHz.

However, the converted signal may have a large number of mixed frequency components in addition to the reference frequency, so the bandpass filtering is performed with Fc = 21.6MHz before amplification.

The band-limited signal is introduced into the demodulator 18 through the RF amplifier stage, wherein the demodulator 18 is a 2-level FSK comparator, quadrature detector, low pass filter. It is converted to 455KHz, which is the secondary intermediate frequency through pass filter, data shaping circuit, quick charge circuit and constant voltage circuit.

The modulated demodulated signal must be POCSAG decoded, but the company's S-70L4B device is used by several companies as a dedicated chip. Therefore, after the demodulated signal is decoded in accordance with the POCSAG format, the decoded data is transmitted to the system controller 4, thereby ending the role of the RF module for receiving the pager signal. In addition, the system controller 4 determines the area of the user and determines the reception of the visitor to perform a function appropriate to the purpose.

Hereinafter, the bidirectional data communication will be described.

According to an embodiment of the present invention, a radio bidirectional module is constituted in the system controller 4 separately from the pager receiving RF signal detecting means 1 for bidirectional communication of remote meter reading and other management data.

These wireless modem modules feature a BIM-418-F / BIM-433-F transceiver with Fo = 418 MHz or 439.92 MHz, output power is 10 mW, the linear linear distance is limited to 250 meters, and the processor type is PIC16C84-. 10, and the power supply was determined with a 9V input.

The main reason for using the wireless modem type in the bidirectional wireless data communication circuit according to the present invention without using the existing RF wireless module is to suppress the data correction function, carrier detection, and the Spurious field amplification effect.

The bidirectional data communication module according to the present invention operates in a manner in which carrier detection is tuned to a preamble code. For example, in a standby mode, the modem continuously monitors whether there is data transmission. When the (Preamble) code is introduced, the PIC MPU 41 notifies the system controller 4 that the channel is using carrier detection, and opens the RX stage to the system controller 4.

Thus, a problem caused during reception is exchanged between the system controller 4 and the modem MPU, and the modem sends a data correction signal to the remote modem and, if necessary. Here, reference numeral 42, which is not described, denotes an LCD display panel, 43 denotes a device selector, 45 denotes a real-time clock generation unit, 44 denotes an input / output device, 47 denotes an epyrom, 48 denotes a RAM, and 46 denotes an SIO UART.

On the other hand, the necessary transmission protocol consists of [preamble], [sync character], [data], and [error checking code]. At this time, since the preamble is the first part of the binary code introduced later, the preamble lasts for a time within 6 ms. The sync character is an additional code to induce an additional sensing error, and is used as a signal to be synchronized by the SIO UART 46 of the system controller 4 during serial communication, and thus, no parity, 8 bits, and 1 stop bit are used. The error check code reflects the sync character and data bitstream information and is used for error detection.

During transmission, the data must be balanced to 1 and 0, which is solved by code-balancing.

On the other hand, the system controller 4 will be described as follows.

In order to control the operation of the system according to an embodiment of the present invention, an MPU (Micro Processor Unit Unit 41), an auxiliary circuit, a memory element, and a control logic element are required.

According to the present invention, the 8051 series of Intel or Artmill was used as the main control element, and in particular, the 80C series was selected for low power consumption. This system controller (4) is a detailed component using 64K Eprom, 64K Ram, Dallas' real time clock for standard time input, Maxim's device for serial communication, and PLD (Programmable Logic Device) as an accessory device. We created a control sequence to control. External input data was received using the HC541 series of dual input / output devices 44.

An important role of the system controller 4 is to properly analyze and respond to signals from external input elements. For example, according to the embodiment of the present invention, the system controller 4 performs the following role.

a) Receive and analyze RF decoded data

First, when the system is operated, the self-locating operation of the pager is performed. In the pyramid 47 of the controller, the Dummy Cap code is based on 5 base frequencies, 1 home frequency, 9 visit frequencies, and wireless broadband protocol. (009991) The analysis identifies the service area and returns to Home if it is a Home area, and if not, tunes the received frequency to the service channel.

However, if there is no Cap-Code after a certain time, the channel is scanned again.

Depending on the RF paging signal, the controller is committed to doing so, based on the sequentially listed priorities for load shedding.

Message Frame: Start bit + 8bit data code + Stop bit + Parity

a-1) Emergency load front off

1 + 11001100 + 1: Fixed Data Code

a-2) Time limit load breaking

1 + 00HHMMMM + 1: HH; Hour, MMM; minute

HH; 00: 1 hour, 01: 2 hours, 10: 3 hours, 11: 4 hours

MM; 000: 0 minutes, 001: 10 minutes, 010: 20 minutes, 011: 30 minutes

100: 40 minutes, 101: 50 minutes, 11x: Dontcare

a-3) Load selection Load interruption: Relay control for short circuit of load power

1 + 10000RRR + 1 Load management relay ON, OFF

The three main functions above are the control methods that the main control system puts on the load according to the input message of the phaser signal. In addition, when other control cases arise, the corresponding message protocol components can be augmented.

In order to perform the function of the digital electricity meter, which is considered to be an important factor in the present invention, the control system integrates the data returned by the ADC conversion through the current sensor through the input device, and the accumulated data is stored in the nonvolatile memory device. The result is displayed on the LCD display panel.

The control system calculates the daily power consumption pattern based on the accumulated power consumption data and performs appropriate load control according to the result. The power consumption data is stored in its own memory for 3 months in order to be used later, and the transmitted data is transmitted to the outside when necessary.

In addition, since the power consumption data is stored in a database for each load channel, it is very advantageous to investigate the power consumption by type when connecting to the main power source by ensuring the load classification for each channel. Conversely, if the total power usage is limited, priority is given to the load short-circuit control for each channel.

3) Power control and load control circuit

Galvanization of alternating current uses the CT sensor as the primary

E ₀ = I ₀ R _t / n (R: load resistance, n: number of secondary windings)

Therefore, by using an appropriate current sensor, it senses an AC current, converts it into a voltage value, level-shifts it, and then amplifies and converts the current flow into power.

The CT-05 series is used as a sensor to detect the flow of 60Hz current because the general galvanization linearity of the load resistance is better than that of the CT-06 series.

In addition, since the CT-05 series operates a single + 5V, it is easy to use because it maintains level compatibility with other logic series.

The load control function of the digital electricity meter includes a partial power switching function of the load distribution device by the nationwide wide area pager protocol.

In addition, the switch can be opened and closed with the digital signal of the power supply port transmitted to each load group. As shown in FIG. 3, the control circuit related to this is realized primarily by using an optical photodiode and a light receiving sensor 201 for isolating power from the main system. However, the output signal on the optical element side is reversed from the main control signal. This is again inverted 202 to excite the relay 202 secondarily. The 24V coil voltage is applied to the electronic switch 204 by the excited relay 203, and the electronic switch, which is applied with the voltage, serves to discharge or disconnect the class of the 110V or 230V main voltage to the lower load.

As described above, the reason for power isolation in two times is to prevent reverse voltage to the main system in primary isolation, and to prevent adverse effects of various surge currents and voltages occurring in electronic switching in secondary isolation.

Expansion of the module for load control can be done by modifying the operation program of the main control circuit and increasing the number of output ports of the external output device, and then inserting the same light emitting and receiving sensor module into the expansion port to remotely control the internal and external control circuits. Short circuits and reconnections can be performed as information flows.

According to the above description, it is easy to manage the power load by central control of KEPCO by improving the simple power integration function performed by the existing analog wattmeter or digital wattmeter, and the remote meter reading and remote load part control in internal firmware application. Active load control is possible, and the functional scope can perform digital power meter, demand controller, wireless remote meter reading, and wireless remote load control as internal functions.

Accordingly, the central power control center can stop the transmission load by time zone or resume operation by wirelessly controlling the control command of the power control system to be installed in each region for cutting the maximum power load in the daily high load time zone. This can be a great help in management.

In addition, internally, there are separate bridges for connecting power consumption loads by type, so that loads can be classified into dynamometers, home appliances, lighting systems, etc., and the classified loads can be managed with priority in terms of overall power consumption management. It became.

As described above, according to the present invention, power control operation can be effectively performed by providing a system consisting of a digital electricity meter and a two-way control system for a demand controller, a remote power control controller, and a remote meter reading according to the type of power load.

In addition, wireless meter reading and wireless short-circuit control can be performed remotely, so that the main power short-circuit task for the unpaid power bills currently suffered by KEPCO can be carried out in the user's home and can be controlled remotely from 200 meters away. Smoother non-payment management is possible.

In addition, according to an embodiment of the present invention, since a large number of ports for receiving data flowing from an external system are designed, an external system based on a load pattern and control data, for example, a water level controller or an air conditioning system, can be easily controlled. In some cases, the pager number of the installed power control system is disclosed to control the load group classified by telephone.

The present invention has the greatest feature of freely controlling the load meters installed in each unit by using the infrastructure of the current RF pager system as it is, and by applying a flexible firmware application to the main control system according to the load group applied thereto. Power control management and RF load control can be properly adjusted.

Claims (4)

RF signal detecting means for detecting an RF signal introduced from the outside, Power detection means for detecting a flow of load current and converting the amount of power into a required amount of power; Load control short circuit module for short circuit and connection of load, A system controller that controls the operation of the system and stores the acquired data; And a power supply means for supplying power to the RF signal detection means, power detection means, a load control short circuit module, and the system controller, A power control system for performing a remote meter reading, a remote short control function and a load control function of a digital meter. The method of claim 1, The remote meter reading and remote short-circuit control function of the digital meter is performed by a wireless modem / module for two-way wireless communication. The method of claim 1, The load control short-circuit module includes an optical photodiode and a light receiving sensor means for isolating power from the main system; Relay means excited according to the inverted output signal of the photophotodiode and the light receiving sensor means; And an electronic switch means for transmitting or disconnecting voltage to the load by the excited relay means. The method of claim 1, And the load control function of the digital electricity meter includes a partial power switching function of the load distribution device by a nationwide wide area pager protocol.