Research On Micro - Power Wireless Communication Performance Test And Network State Evaluation

It is an important indicator that the communication level of electric energy acquisition system to measure the intelligence of power grid. Communication channels of electric energy acquisition system are divided into uplink channel and downlink channel, and the development of the uplink channel has been relatively mature, the transmission way of downlink channel widely used electric power carrier way, however, it gradually has been eliminated in power grid communication, because of the power carrier signal only can transfer from the single-phase power line within the scope of distribution transformer area, and there are glitches, high cut and other shortcomings, with the advantage of low power consumption, high pass rate and ad-hoc network that micro-power wireless communication gradually is accepted by the market and get the popularization and application. Recently there are few studies on performance testing and network evaluation of intelligent electric energy acquisition system about micro-power wireless communication, which directly lead to a lot of micro-power wireless meter does not meter or low success rate of meter reading after the installation is completed in the field, therefore, the research on the performance and network status of micro-power wireless communication has a great significance, this paper mainly contains the following aspects:(1)This paper carried out the research on performance testing and network state evaluation of micro-power wireless communication, firstly, analyze the characteristics of micro-power wireless communication and the transmission process of the channel which exists larger attenuation, smaller attenuation, noise interference and adjacent frequency interference, the channel model is established, by importing the master software to testing channel attenuation and interference, and simulate the actual channel transmission process of micro-power wireless communication.(2) Secondly, according to the principle of the CFDA technology (Cellular Fixed-wireless Digital Access), hierarchical energy equalization method is used to reduce the energy consumption of node, through integrated treating a number of individual performance indicators under different paths of communication modes, and the comprehensive evaluation of single-hop, multi-hop and hybrid communications network performance, by using the optimal communication path to initiate networking for watt-hour meter, which can achieve data acquisition communication network of 8 magnitude 7 jump watt-hour meter.(3) Finally, relying on the node hierarchical energy equalization method’initiate networking for meters, each level of network sets corresponding signal attenuation and interference through the main control software, and establish performance testing and the network state evaluation system of micro-power wireless communication, which consists of three parts:RF characteristic, protocol conformance and network status testing, through designing multifunctional electromagnetic cell that restraining the electromagnetic wave is 70 dB or more to shield the human disturbance of 100MHz-2000MHz and the internal device interference, reduce the error caused by the test environment and equipment, then to improve the testing accuracy, and reflect the comprehensive performance of communication network...