86 A Nonlinear Power Control Strategy for Ultra-High Voltage Tie Line

In order to mitigate the power fluctuations on ultra-high voltage (UHV) tie-line, a non-linear PI control strategy is proposed. Based on the dead band of regional control units, this strategy according to the real generations of provincial and regional control units to calculate the area control error (ACE) to as the new control objective. It changes the proportion and integral parameters as the ACE changes, to enhance its ability of restraining the power fluctuations on UHV tie-line. In the end, a simulation of Central China Power System under this strategy is established, and the simulation results show that this strategy works more effectively.