research highlights
Missing data recovery (continued)
All algorithms are currently implemented in MATLAB. Future work includes implementing the online OLAP
algorithm in Open PDC to allow for its use in tandem with a number of other real-time applications, such as
phasor state estimation and data visualization (Figure 3).
Figure 3: Real-time implementation of the Data Recovery Algorithm
Measurement-based Adaptive Wide-Area Damping Controller Considering Time Delays
by Dr. Yilu Liu ([email protected])
Wide-area measurement systems enable the wide-area damping controller (WADC) to use remote signals to
enhance the small signal stability of large scale interconnected power systems. System operating condition
variations and signal transmission time delays are the major factors that decrease the damping effect and
even threaten the system stability. At CURENT, we developed a novel measurement-based adaptive WADC
scheme using oscillation mode prediction and system identification techniques. These techniques adjust
the parameters of WADC as well as the time delay compensation in an online environment. To achieve
fast online implementation, the high-order multi-input multi-output (MIMO) model identified from widearea measurements is deformed into a low-order single-input single-output (SISO) model according to the
residue of MIMO model. The SISO model can accurately represent the power system dynamics in the form
of a transfer function, capturing the dominant oscillatory behaviors in the frequency range of interest. The
effectiveness of the proposed measurement-based adaptive WADC has been demonstrated in a two-area,
four-machine system on the Hardware Testbed (HTB) under various disturbance scenarios.
Figure 1 illustrates the flow chart of measurement-based adaptive WADC scheme considering communication
delays. Figure 2 shows the effectiveness of the SISO model in representing the system small-signal dynamics.
Figure 3 shows the superior damping control performance of proposed adaptive WADC controller compared
to the conventional fixed-parameter WADC m