基于相位角的失步解列判据在复杂场景下的适应性及对策

明确基于就地信息解列判据在大电网适应性,以及对指导复杂大电网运行与控制具有重大意义。分析了失步振荡中心两侧等值电势电压幅值不等、解列装置安装位置和多频振荡对失步过程中相位角变化规律的影响,研究了基于相位角解列判据在复杂场景下的适用条件,提出了适用于大电网的配置原则和应对策略。以失步振荡中心为分界点,配置在等值电势电压较高侧的解列装置存在不能正确识别系统失步的风险,现有工程判据适用于等值电势比小于1.4的场景,配置在等值电势电压较低侧的解列装置存在误判失步周期问题。针对潜在风险,提出统一失步振荡中心方向判断逻辑,在备选解列断面双侧配置解列装置和闭锁反方向失步判断逻辑等应对策略。以多频失步振荡场景,验证了改进策略的正确性。

Adaptability and Countermeasures of Splitting Criterion Based on Phase Angle in Complex Scenarios

Defining the adaptability of splitting criterion based on local information in complex and large-scale power grids is of great significance to guiding complex operation and control of power systems. The adaptability of splitting criterion based on phase angle in complex scenarios is studied. The effects of both equivalent machine voltage amplitude ratio and multi-frequency oscillation on phase angle change regulation in the out-of-step oscillation process are analyzed. For the problems identified, the configuration principle and strategies suitable for large-scale power grid is proposed. For an out-of-step oscillation mode with different voltage amplitudes of equivalent electromotive force, the system can be divided into two parts in the oscillation center as decomposition points. When the voltage amplitude is relatively large, the splitting device arranged on the high voltage side cannot correctly identify the out-of-step risk. Existing engineering criterion is suitable for the scenario of the equivalent electromotive force voltage amplitude ratio less than 1.4. On the other hand, the splitting device arranged on the low voltage side cannot correctly judge the out-of-step cycle. In view of the potential risks, measures are put forward for configuring splitting devices on both sides of the oscillation center, using the unified judgment logic of out-of-step oscillation center direction and blocking opposite direction out-of-step judgment logic. The correctness of the improved strategy is verified in a multi-frequency oscillation scenario. This work is supported by State Grid Corporation of China, Major Projects on Planning and Operation Control of Large Scale Grid (No. SGCC-MPLG003-2012).