Analysis of Stability Control Mismatch Scenario in Renewable Energy Sending System

The increasing scale of renewable energy integration and the widespread application of direct current transmission technology have significantly increased the complexity and variability of power system operation modes. Traditional pre-planned control methods based on pre-designed fault scenarios and pre-decision making are difficult to cope with low-probability cascading disturbances full of uncertainties, leading to a high risk of strategy mismatch. To reduce the risk of instability and provide guidance for the formulation of emergency control strategies, this paper investigates the mismatch causes and constructs mismatch scenarios for renewable energy export systems. Firstly, based on the transient characteristics of renewable energy units, the transient stability mechanism of the system's power angle is studied. Then, based on the transient stability mechanism, the impact of various factors on the transient stability of the system is quantitatively characterized and the causes of emergency control mismatch are extracted. Finally, based on the key influencing factors, a method for constructing power angle mismatch scenarios facing practical renewable energy delivery systems is proposed, establishing a relatively comprehensive analysis mechanism of control mismatch scenarios.