Transmitting Power System Dynamics in Existing SCADA Using Sampling/Interpolation Based Data Compression

Grasping system dynamic information is helpful for dispatcher in control center to take correct control action in time under emergency condition. Wide Area Measurement Systems (WAMS) has been viewed as an ideal system to monitor power systems since it can provide comprehensive profile and dynamic behavior of the power systems. Whereas, for its demanding request on communication systems, it might not operate when part of communication systems fails. Therefore, it is highly preferred to facilitate Supervisory Control and Data Acquisition (SCADA) with the capability to transmit power system dynamics as an alternation. Based on the development of substation automation system, a novel approach is proposed to transmit system dynamics in existing SCADA using data compression. Uniform sampling based data compression and interpolation based reconstruction are utilized to reduce data volume and mitigate restriction of communication capacity. The system dynamics is compressed in Remote Terminal Units (RTUs) so that a few samplings could contain system dynamics information. The sampled data could be used to reconstruct dynamics information by interpolation. Simulation on a 36 nodes system shows feasibility of the proposed approach.