Research On Active Power Safety Correction Control Strategy Of Large-scale Wind Power Integration

Power system Active safety correction is to study how to adjust the output state of the generator or load when the system occurs limited slip, and eliminate the more limited slip. With Integration of large-scale wind power, it will cause intermittent and random fluctuations frequently to the slip trend, even more limited slips problem, triggering a chain of failures, leading to power accident. Therefore, research on active safety control strategy correction grid connection of wind power cluster has important practical significance.This article provides an overview of current research and active safety correction control problems, describes several types of wind turbines and wind farm group. Wind power output characteristics were studied in different spatial and temporal scales, and analyze effect on power of the contact line with large-scale wind power integration. Then, it studied the sensitivity method and lining program method of correction control of active power. Sensitivity method studied the node-branch flow sensitivity matrix based on the DC current, and the reverse pairing the same amount based on the sensitivity. For the lack of sensitivity of traditional methods, a comprehensive sensitivity was introduced, considering the limited slips and heavy slips, and lowering status of the entire cross-section. Then, strategy based on comprehensive sensitivity and the reverse pairing the same amount was introduced; Lining program methods studied the mathematical model of lining program, general and standard form, and mathematical model of active correction, including the control variables and objective function, and lining treatment of various constraints were discussed in depth, including the power balance constraints, inequality constraints of branch flows, generator output upper and lower constraints, and then proposed active control strategy based on lining program. Finally, considering the advantages and disadvantages for both methods, this paper presents a comprehensive active correction control strategy based on the agreed rules, consider special nature of wind energy access and the output characteristics of the variety of units, based on the severity and the limited rule-making, preferred crossing selection between the two methods, thus combines the advantages of both methods. Finally, Use Gansu Hexi grid and CEPRI36 bus system as simulation to prove feasibility and effectiveness of the proposed control strategy of active safety correction.