CN102436732B - Electric energy quality type energy efficiency data acquisition terminal - Google Patents

Abstract

The invention provides an electric energy quality type energy efficiency data acquisition terminal. The electric energy quality type energy efficiency data acquisition terminal comprises a shell, a micro control unit (MCU) module, a power storage module which is connected with the MCU module, and an analog/digital (A/D) conversion module and a communication module, which are respectively connected with the MCU module, wherein an electromagnetic shielding layer is coated on the shell; and the communication module is selected from a recommended standard (RS) 485 interface, a programmable logic controller (PLC) unit and a micro-power wireless unit. By adoption of the electric energy quality type energy efficiency data acquisition terminal provided by the invention, various kinds of electric quantity parameters can be acquired by clustered deployment.

Description

A power quality type energy efficiency data acquisition terminal

technical field

The invention relates to an energy efficiency collection device in the electrical instrumentation industry, in particular to a power quality type energy efficiency data collection terminal.

Background technique

The lack of basic technology and basic data in the existing technology has brought great obstacles to the overall development of the energy-saving industry. Accurate basic energy efficiency data is the key to evaluating the effect of all energy-saving technologies. At present, the confusion of various energy-saving data and energy-efficiency information has brought many hidden dangers to the energy-saving industry. Therefore, it is urgent to establish a unified energy efficiency data center to obtain comprehensive energy-saving service industry data, provide data support and technical support for the development of the energy-saving industry, monitor energy-saving projects and evaluate energy-saving service agencies, and provide energy-saving policies for the country and government agencies at all levels Provide support.

Accurate energy efficiency basic data mainly depends on on-site real-time collection, which needs to be collected and transmitted by a dedicated collection terminal. There are many electrical parameters such as phase/line voltage/current, power factor, fundamental wave power, harmonic power, etc. in the actual site. The real-time collection effect of these parameters directly affects the reliability of the energy efficiency analysis results. Therefore, it is urgent to develop a real-time power quality energy efficiency data acquisition terminal that meets the requirements of industrial site and energy efficiency monitoring.

The utility model with the patent number ZL201020214236.2 discloses a special transformer collection terminal equipped with a modular communication module, which is a device for collecting electric energy information of special transformer users. The remote communication module and the signal expansion interface module solidified in the specific variable acquisition terminal are designed as plug-in modules, and uniform pins are formulated.

The utility model with the patent number ZL200920069055.2 discloses a wireless data collection terminal, which includes a radio frequency identification module, a main control module and a communication module to realize wireless data collection and wireless transmission.

The utility model with the patent number ZL200920279096.4 discloses a collection terminal for a power management system for easy deployment and expansion.

The utility model with the patent number ZL200920236498.6 discloses a collection terminal for centralized meter reading system of low-voltage power users, which can be operated on the master station to realize remote system update.

The above utility models provide a technical basis for the research and development of power quality energy efficiency data acquisition terminals, but they do not meet the requirements of cluster deployment, multi-type data collection, and multi-interface transmission to fully adapt to industrial field energy efficiency harmonic power collection.

Contents of the invention

In order to overcome the above defects, the present invention provides a power quality type energy efficiency data collection terminal, which can collect various harmonic power parameters through cluster deployment.

In order to achieve the above object, the present invention provides a power quality type energy efficiency data acquisition terminal, the acquisition terminal includes: a shell, an MCU module, a power storage module connected to the MCU module, the improvement is that it is connected to the MCU The modules are respectively connected to an AD conversion module and a communication module; all the above-mentioned modules are arranged in the casing, and the inside of the casing is coated with an electromagnetic shielding layer.

In the preferred technical solution provided by the present invention, the MCU module controls the power storage module, AD conversion module and communication module, and receives parameters transmitted by the AD conversion module.

In the second preferred technical solution provided by the present invention, the power storage module includes a DC power supply, an auxiliary power supply and a data storage.

In the third preferred technical solution provided by the present invention, the AD conversion module is a chip of the model ADS1178; the AD conversion module collects the analog quantities of three-phase voltage, three-phase current and neutral line current, and the collected analog quantities Perform calculation processing after A/D conversion, and transfer the processing result to the MCU module.

In the fourth preferred technical solution provided by the present invention, the communication module includes RS485 and an expansion interface; the expansion interface can be inserted into a PLC unit or a micropower wireless unit according to communication requirements.

In the fifth preferred technical solution provided by the present invention, the electromagnetic shielding layer of the housing is a polymer layer; the housing is provided with a display device for displaying collected parameters and an auxiliary terminal for collecting data; the display device and the The MCU module is connected, and the auxiliary terminal is respectively connected with the AD conversion module, the sensor module and the communication module.

In the sixth preferred technical solution provided by the present invention, the MCU module records the following events and the following functions: harmonic 1 curve, harmonic 2 curve, voltage/current curve, power curve, harmonic over limit event, harmonic Power curve, ABC current/voltage deviation over limit event, voltage loss/current loss event, voltage/current unbalance curve, flicker curve, monthly settlement, power freezing, power-on, power-off, reset, phase failure And school hours.

In the seventh preferred technical solution provided by the present invention, the MCU module is a chip with the model number AT91SAM9260.

In the eighth preferred technical solution provided by the present invention, the data memory is a chip with the model number AT24C64.

In the ninth preferred technical solution provided by the present invention, the PLC unit is a chip of model 74HTC244, and the micropower wireless unit is a chip of model CC1100.

In the tenth preferred technical solution provided by the present invention, the display device is a 2048-color liquid crystal display with a size of 3.5 inches.

In a more preferred technical solution provided by the present invention, the polymer layer is selected from polyaniline, polythiophene or polyparaphenylene.

In the second preferred technical solution provided by the present invention, the harmonic 1 curve refers to the recording of the 2nd to 19th harmonics and the corresponding curves of voltage total harmonic distortion rate THDU and current total harmonic distortion rate THDI ;

The harmonic 2 curve refers to recording the 20th to 50th harmonics and the corresponding curves of voltage total harmonic distortion rate THDU and current total harmonic distortion rate THDI;

The power-off refers to the working condition that the three-phase voltage is lower than the critical voltage of the electric energy meter, and the load current is not more than 5% of the rated current;

The voltage loss refers to that in the three-phase power supply system, the load current of any phase is greater than the starting current, but the voltage of the voltage line is lower than 78% of the reference voltage of the electric energy meter, and the duration is longer than 1 minute;

The current loss means that in a three-phase power supply system, the three-phase voltage is greater than the critical voltage of the electric energy meter, any phase or two phases of the three-phase current are less than the starting current, and the load current of other phase lines is greater than 5% of the rated current. condition;

The electrical energy freezing refers to the notification of the currently frozen electrical energy.

In the third preferred technical solution provided by the present invention, the time correction operation adopts a soft clock and network time synchronization.

In the fourth preferred technical solution provided by the present invention, the polymer layer is made of polyethylenedioxythiophene.

Compared with the existing technology, the technical solution provided by the present invention can not only solve the problem of power quality and power type energy efficiency data collection and transmission according to the actual needs of energy efficiency evaluation, but also have flexible power quality analysis functions and fully meet the purpose of real-time energy efficiency monitoring; The quality-based energy efficiency data acquisition terminal realizes the display of various electric energy information and the safe, stable and reliable transmission of various interfaces, making it possible to collect and transmit energy-efficiency harmonic electric quantity data in real time, especially for the 2nd to 19th harmonic Real-time acquisition of energy waves solves the disadvantage of high cost of smart meters, is suitable for comprehensive promotion, and can provide accurate energy efficiency basic data for energy efficiency data centers, providing technical support for energy conservation policies; in addition, the terminal also fully considers different tasks. Environmental requirements, such as the communication mode can choose micro-power wireless or PLC signal transmission, and leave an expansion interface for the future master station to realize intelligent control; moreover, the acquisition terminal has strong anti-interference, and the electromagnetic shielding layer used has a complete The careful electromagnetic compatibility design can make the collection terminal free from electromagnetic interference when it operates in harsh environments such as high and low temperature, high pressure and high humidity, and it also has perfect and careful three-level lightning protection measures.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of a power quality energy efficiency data acquisition terminal.

Fig. 2 is a schematic diagram of the front part of the acquisition terminal shell.

Fig. 3 is a schematic view of the rear and side of the acquisition terminal housing.

Figure 4 is a schematic diagram of the auxiliary terminals.

Figure 5 is a remote local schematic diagram of the RS485 interface.

Figure 6 is a remote local schematic diagram of a PLC unit and a micropower wireless unit.

Detailed ways

As shown in Figures 1 to 4, the power quality type energy efficiency data acquisition terminal collects the phase voltage, phase current and neutral line current analog quantities of the voltage sensor and current sensor, and obtains power, power factor, Information such as frequency, harmonics and electric energy. The micro control unit (MCU) realizes data operation storage and management, and then realizes uplink communication through RS485 interface, PLC or micro-power wireless.

The micro control unit (MCU) adopts AT91SAM9260 with an ARM9 core as the MCU, and the highest frequency of the AT91SAM9260 can reach 180MHZ.

The AD conversion module adopts TI's ADS1178 analog-to-digital converter, which has a precision of 16 bits and a conversion rate up to 52kSPS, so as to ensure the speed and precision of harmonic calculation.

Described micro control unit (MCU) module is the core of whole terminal, and described MCU module is the chip that model is AT91SAM9260; Described MCU module realizes the record of following event and following function through data operation processing: harmonic 1 curve, Harmonic 2 curve, voltage/current curve, power curve, harmonic limit event, harmonic power curve, ABC current/voltage deviation limit event, voltage loss/current loss event, voltage/current unbalance curve, flicker Curve, month-to-month settlement, power freeze, power-on, power-off, zero reset, phase failure and time adjustment.

Wherein, the harmonic 1 curve refers to recording the 2nd to 19th harmonics and the corresponding curves of voltage total harmonic distortion rate THDU and current total harmonic distortion rate THDI;

The harmonic 2 curve refers to recording the 20th to 50th harmonics and the corresponding curves of voltage total harmonic distortion rate THDU and current total harmonic distortion rate THDI;

The power-down event refers to a working condition in which the three-phase voltages are all lower than the critical voltage of the electric energy meter, and the load current is not greater than 5% of the rated current.

The voltage loss refers to that in the three-phase power supply system, the load current of a certain phase is greater than the starting current, but the voltage of the voltage line is lower than 78% of the reference voltage of the electric energy meter, and the duration is longer than 1 minute.

The current loss means that in a three-phase power supply system, the three-phase voltage is greater than the critical voltage of the electric energy meter, any phase or two phases of the three-phase current are less than the starting current, and the load current of other phase lines is greater than 5% of the rated current. condition.

The electric energy freezing event refers to the notification of the currently frozen electric energy.

For voltage/current curves, power curves, harmonic limit events, harmonic power curves, ABC current/voltage deviation limit events, voltage/current unbalance curves, flicker curves, month-to-month settlement, power-on, and reset , Phase failure and timing records are in line with the following national standards: GB12326-2000 standard, GB12325-2003 standard, GB/T 14549-1993 standard, and GB/T 15945-1995 standard.

Among them, the records of the harmonic over-limit events, voltage/current unbalance over-limit events, and ABC current/voltage deviation over-limit events are downloaded to the equipment through the above-mentioned standard limits according to the on-site power quality requirements, so as to realize the electric energy Quality analysis function.

Wherein, for the curve record, the default time interval for copying is 15 minutes, and other values can be flexibly set.

As shown in Figures 5 and 6, the communication module uses one of the RS485 interface, micropower wireless unit or PLC unit, wherein the RS485 interface is used as the standard configuration interface of the instrument, and the micropower wireless module and PLC module are designed to be pluggable In the form of extended interface, the same interface standard is used on the instrument, so that the corresponding communication module can be used according to different environments and costs. The RS485 interface can also be used as a maintenance interface for parameter setting.

Wherein, the PLC unit is a chip of model 74HTC244; the micropower wireless unit is a chip of model CC1100.

The specifications of the CC1100 chip are: working frequency band: 402-470mhz; micro-transmission power: maximum transmission power 10mw; sleep current <10ua; the CC1100 chip supports high-precision temperature-compensated crystals, and can perform multiple channels such as 8/16/32 Channel selection and has multiple user interfaces such as rs232/rs485/uart interface, and supports communication rates such as 1200/2400/4800/9600/19200/38400bps, supports communication formats such as 8n1 and 8e1, and can automatically and quickly complete receiving/sending Mode switching, user-friendly.

The power quality type energy efficiency data acquisition terminal is designed in an intensive way combining soft clock and network time synchronization, reducing hardware structure complexity and power consumption, so that the working environment temperature, humidity, and atmospheric pressure all meet the power consumption information acquisition system standard; In order to reduce device cost, an on-chip clock can be used.

During the data collection and storage operations of the power quality type energy efficiency data collection terminal, since the collection terminal is not used for billing and metering, the collection accuracy is in accordance with the B-level precision of the equipment. Or the accuracy of the acquisition terminal can reach (GB/T 17215.321-2008/IEC 62053-21: 2003) not less than level 2 accuracy. The default time interval for curve record copying is 15 minutes, and it can be set flexibly; according to the size of the collected data, select the appropriate memory size.

Wherein, the data memory uses a chip of the model AT24C64; the power quality and power type energy efficiency collection terminal does not use a concentrator to collect data, so the data memory is designed to store a curve of 30 times 96 points when saving data For data, when the 20-50th harmonic data is not stored, each point stores 530 Bytes, and a total of 1491K is required; if the 20-50th harmonic data needs to be stored, an additional 1308K storage space is required.

The shell of the power quality type energy efficiency data acquisition terminal is coated with an electromagnetic shielding layer, the electromagnetic shielding layer is formed by a conductive polymer layer, and the conductive polymer layer can be a soluble or dispersible material, such as: polyaniline , polythiophene and polyparaphenylene; the conductive polymer layer is preferably made of polyethylenedioxythiophene.

The size of the power quality type energy efficiency data acquisition terminal can be: length 260mm to 270mm, width 165mm to 175mm, height 70mm to 80mm; the most preferred size is: length 265mm, width 170mm, height 75mm.

It should be declared that the contents and specific implementation methods of the present invention are intended to prove the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the protection scope of the present invention. Those skilled in the art may make various modifications, equivalent replacements, or improvements under the inspiration of the spirit and principles of the present invention. But these changes or modifications are all within the protection scope of the pending application.

Claims (7)

1. A power quality type energy efficiency data acquisition terminal, the acquisition terminal comprising: a shell, an MCU module, a power storage module connected with the MCU module, characterized in that, the AD conversion module connected respectively with the MCU module and A communication module; all the above-mentioned modules are arranged in the housing, and the inside of the housing is coated with an electromagnetic shielding layer; The MCU module controls the power storage module, the AD conversion module and the communication module, and connects the parameters delivered by the AD conversion module; Described AD conversion module is the chip of model ADS1178; Described AD conversion module collects the analog quantity of three-phase voltage, three-phase current and neutral wire current, and after the analog quantity A/D conversion of gathering, carry out operation processing, process The result is passed to the MCU module; The MCU module records the following events and the following functions: harmonic 1 curve, harmonic 2 curve, voltage/current curve, power curve, harmonic limit event, harmonic power curve, ABC current/voltage deviation limit event , loss of voltage/current event, voltage/current unbalance curve, flicker curve, monthly settlement, power freezing, power-on, power-off, zero reset, phase failure and time calibration; The MCU module is a chip whose model is AT91SAM9260; Described data memory is the chip that model is AT24C64; The harmonic 1 curve refers to recording the 2nd to 19th harmonics and the corresponding curves of voltage total harmonic distortion rate THDU and current total harmonic distortion rate THDI; The harmonic 2 curve refers to recording the 20th to 50th harmonics and the corresponding curves of voltage total harmonic distortion rate THDU and current total harmonic distortion rate THDI; The power-off refers to the working condition that the three-phase voltage is lower than the critical voltage of the electric energy meter, and the load current is not more than 5% of the rated current; The voltage loss refers to that in the three-phase power supply system, the load current of any phase is greater than the starting current, but the voltage of the voltage line is lower than 78% of the reference voltage of the electric energy meter, and the duration is longer than 1 minute; The current loss means that in a three-phase power supply system, the three-phase voltage is greater than the critical voltage of the electric energy meter, any phase or two phases of the three-phase current are less than the starting current, and the load current of other phase lines is greater than 5% of the rated current. condition; The electrical energy freezing refers to the notification of the currently frozen electrical energy; The time calibration operation adopts soft clock and network time synchronization. 2. The acquisition terminal according to claim 1, wherein the power storage module comprises a DC power supply, an auxiliary power supply and a data memory. 3. collection terminal according to claim 1, is characterized in that, described communication module comprises RS485 and expansion interface; Described expansion interface comprises PLC unit and micropower wireless unit, and described expansion interface can insert PLC unit according to communication demand or micropower wireless units. 4. collection terminal according to claim 1, is characterized in that, the electromagnetic shielding layer of described shell is polymer layer; Described shell is provided with the auxiliary terminal of the display device that shows the parameter that gathers and gathers data; The display device is connected to the MCU module, and the auxiliary terminals are respectively connected to the AD conversion module, the sensor module and the communication module. 5. The collection terminal according to claim 3, wherein the PLC unit is a chip of model 74HTC244, and the micropower wireless unit is a chip of model CC1100. 6. The acquisition terminal according to claim 4, wherein the display device is a 2048-color liquid crystal display with a size of 3.5 inches. 7. The collection terminal according to claim 4, wherein the polymer layer is selected from polyaniline, polythiophene, polyparaphenylene or polyethylenedioxythiophene.