| With the capacity of the power systerm and the voltage of the power grid increasing, the traditional electromagnetic transformers appear more and more weaknesses, which is more and more difficult to meet the development of the power grid. The new trend that new types of electronic transformers replace the traditional electromagnetic transformers is inevitable. There are two types of electronic transformers as follows: the passive electronic transformers and the active electronic transformers. The sensor technology used in the active electronic transformer is more mature with practical advantages. In this thesis, we focus on signal processing of the Rogowski coil used in the active electronic transformer, designed the digital integrater and related filer.The integrator of the Rogowski coil is a key component that influences the accuracy and stability. Traditional analog integrator has many advantages, such as simple structure, fast response and large dynamic range, but it also has disadvantages with temperature drift and time drift. The digital integrator has the outstanding advantages with stable performance and high accuracy. These advantages of the digital integrator result that studying the utility of the current transducer recently become a hot problem. This thesis preposes a set of methods of designing digital integrator, including the choice of chips, the digital integrator of the universal structure, deal with input drift, the initial value and input saturation. The experiments of the digital integrators are based on the ADE7759 and ADE7169 chips.In this thesis, based on the chip of TMS320LF2407, the design of the filter adopts the method of MATLAB and CCS, The filer parameters calculated by MATLAB is sent into the filer for simulation. The research of the filter also combines the digital integrator. In this way, we can design similar filers such as low-pass, band-pass, band-stop filters and so on, so as to applications in other power signal processings. |
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