| With the development of the national economy and the enhancement of the living standard, the demand for power is sharply increased. Meanwhile, the shortage and price rise of the resource s has caused a short supply of power. And what's worse, many regional shortage and use-limitation of power consumption has arisen occasionally. The power load management system(PLMS) could counterpoise the use of power by improving the shape of the loads. Accordingly, the existing resources could be unearthed effectively and the economy, security and investment benefit of the power grid operation could also be improved. However, the technical solution to the current PLMS still maintain the original function and logical relationship of the conventional one. For instance, in the conventional system, most functions work in an independent mode, the data interaction is inconsistent due to different protocols and many problems arise in the device communication due to different device manufacturers and poor interoperability. Besides, there are still many shortcomings in hardware and software resources sharing and application costs reduction.DLMS/COSEM is one of the most advanced technical standards of the energy measurement field all over the world now. This standard which has been adopted as IEC62056 by International Electrotechnical Commission(IEC) is the unique interoperable communication protocol suitable for different manufacturers, different instrument models and communication channel. It still has complete protocol specification in the PLMS and is used as the application standards in many foreign countries. However, domestic research and application is still at its initial stage in our country.In this paper, the architecture and contents of the IEC62056 standard will be studied detailedly. A design proposal for using DLMS/COSEM in the PLMS is put forward, combined with the Energy Metering System and PLMS of Heilongjiang Province. Besides, a concept of three-tier configuration chain method for realizing DLMS/COSEM is proposed according to the functional requirements for PLMS terminals and internal requirements for VxWorks OS. Additionally, a feasibility analysis of implementing the electric energy meter and use in PLMS terminal is carried out. Afterwards the application and communication models are designed and main function modules are realized using C language programming. Finally, a model of master station based on Qt and VS 2005 is accomplished and the terminal connection and data access is also realized. According to the test requirements, functionality and performance tests are carried out. Satisfactorily, the results show that the system complies with the load requirements and works well. In a word, the studies in this paper are positive for promoting DLMS/COSEM research and application. |
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