title: Two high accuracy digital integrators for Rogowski current transducers.
abstract: The Rogowski current transducers have been widely used in AC current measurement, but their accuracy is mainly subject to the analog integrators, which have typical problems such as poor long-term stability and being susceptible to environmental conditions. The digital integrators can be another choice, but they cannot obtain a stable and accurate output for the reason that the DC component in original signal can be accumulated, which will lead to output DC drift. Unknown initial conditions can also result in integral output DC offset. This paper proposes two improved digital integrators used in Rogowski current transducers instead of traditional analog integrators for high measuring accuracy. A proportional-integral-derivative (PID) feedback controller and an attenuation coefficient have been applied in improving the Al-Alaoui integrator to change its DC response and get an ideal frequency response. For the special design in the field of digital signal processing, the improved digital integrators have better performance than analog integrators. Simulation models are built for the purpose of verification and comparison. The experiments prove that the designed integrators can achieve higher accuracy than analog integrators in steady-state response, transient-state response, and temperature changing condition.
authors: SEEE of Huazhong University of Science and Technology, Wuhan 430074, China and State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Wuhan 430074, China.
authors: Pan-dian
authors: PD
authors: Luo
authors: SEEE of Huazhong University of Science and Technology, Wuhan 430074, China and State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Wuhan 430074, China.
authors: Hong-bin
authors: HB
authors: Li
authors: SEEE of Huazhong University of Science and Technology, Wuhan 430074, China and State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Wuhan 430074, China.
authors: Zhen-hua
authors: ZH
authors: Li