DSP´s based energy meter

The new solutions on microcontrollers and DSP facilitates the transition from widely-used mechanical meters that yield limited data, to electronic meters that provide extensive information on customer energy usage. In the face of electric industry deregulation and the need for continuous improvement in customer service, the new electronic meters promise utility companies better access to information needed to establish more flexible customer rate plans and the parameters of power system also. One advantage of an electronic meter in nonlinear loads is its high metering accuracy; electronic measurements are more robust and accurate. The paper presents theoretical and experimental aspects related to the power meter design based on Motorola 56800 DSP family. The DSP56F80xfrom Motorola is a fully versatile part for a high performance, low cost, single chip electric energy meter with many additional features not found in other solutions. The on-chip ADC is capable of simultaneous dual sampling, allowing current and voltage to be sampled together in each phase. Energy computations consist mainly of multiplication and addition operations, easily be handled by this DSP. The high ADC sampling rate (up to two samples at 830KHz) contributes to high measuring accuracy, even in a nonlinear load.