Electricity management fees have been used for many years in the traditional operation mode of electricity consumption, post-meter reading, and re-payment. The calculation of the electric quantity value cannot achieve higher precision and the deviation is large. In order to meet the needs of the society and ensure that users use electricity safely, reasonably and conveniently, it is necessary to redesign the traditional electricity meter and electricity to meet the needs of social development.
1. The development prospects of smart meters:
The first stage 2000-2007
Gradually replace traditional electromechanical meters with electronic meters; promote the promotion of one-way communication networks in the United States and Europe;
The second stage 2008-2012
Electromechanical meters are being phased out globally; two-way communication networks based on automated metering infrastructure (AMI, an automatic two-way flow architecture between smart meters with IP addresses and power companies) are being promoted in Europe, America and China; As a simple home gateway, the meter can be used for automatic meter reading (AMR) and load management in a variety of utilities.
The third stage 2013-after
Smart meters become home gateways that enable a variety of residential control functions, such as security, alarms, etc.; intelligent power generation (solar and wind power generation) and distribution in homes and units.
From the above three stages, we can see that smart meters not only do not develop in the direction of small, single functions, but on the contrary, the future will give smart meters more functions, making them an indispensable part of the family.
The peak-to-valley time-of-use tariff and the avoidance of peak electricity prices have been introduced, and the market demand for multi-rate meters will be further increased. Especially for large industrial users, the demand for smart multi-rate meters will produce rapid growth. With the advancement of the information age and the development of technology, smart meters as the nerve endings of the smart grid, in the near future, smart meters will play a greater role in the information society, with a broader application prospects.
2, the introduction of ARM smart meter:
It is because of the above background that smart meters have emerged. The so-called smart meter is the application of computer technology and communication technology, etc., forming a power meter with intelligent chip as the core, with high-precision calculation of power, communication with the host computer, and power-related data display.
The electric energy meter is the only tool for electric power companies to collect electricity charges. The stability of performance, measurement accuracy and reliability are related to the settlement problem between the power sector and users. The electric energy metering technology of smart meters is particularly important. Most of the smart meter systems designed are generally controlled by 8-bit or 16-bit microcontrollers. The control functions are relatively simple, and it is difficult to achieve network and wireless transmission. The scalability of smart meter systems in the future is limited. Based on such limitations, we propose a smart meter system based on ARM processor.
At present, the smart meter we need to design mainly realizes the following functions:
1. Realize high-precision calculation and scalability of smart meters;
2. Realizing two-way transmission of data, including wireless meter reading, the meter sends the customer's power consumption to the power department, and the power department sends the customer account balance back to the meter and displays it on the meter;
3. Realize LED display of data, display of electricity last month, current month, and balance display;
Based on the functional design of the above smart meter, higher requirements are placed on the software and hardware of the meter. Obviously, it is difficult for the conventional meter to do this. ARM technology features high performance, low cost and low power consumption for a wide range of applications, such as embedded control, consumer/educational multimedia and mobile applications. So far, the application of ARM microprocessors and technologies has almost penetrated into various fields, and there are precedents for application on smart instruments and meters, so we use ARM technology to apply to smart meters.
The smart meter adds multiple functions based on the digital meter, making it more adaptable to the requirements of the residents. It is more intelligent, convenient and fast to read the user's power, making it possible to realize the power distribution and power conversion of individual users in the future.
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