一种不依赖线路边界的直流线路单端量阶段式保护方法

• Format: Patent
• Language: Chinese
• Published: 04.07.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

本发明公开了一种不依赖线路边界的直流线路单端量阶段式保护方法，设计暂态电压能量、段动作判据，其中I段动作定值按欠范围整定，实现近距离故障瞬时动作；段定值按过范围整定，与下一线路保护I段动作定值配合，实现被保护线路远距离故障可靠动作，并且作为下一线路远后备保护；此外，该方法通过引入断路器跳闸暂态过压判据，判断保护段是否应该出口，从而保证被保护线路远距离故障或下一线路故障但对应断路器未跳闸时向本地断路器发出跳闸信号，切除故障。本发明适用于线路两端不安装电抗器的场景，弥补了现有直流单端保护依赖线路边界的缺点。 The invention discloses a direct-current line single-ended staged protection method independent of line boundaries, which comprises the following steps of: designing transient voltage energy and section action criteria, setting a section I action constant value according to an underrange, and realizing short-distance fault instantaneous action; the section constant value is set according to an over-range and is matched with the action constant value of the protection I section of the next line to realize remote fault reliable action of the protected line, and the section constant value is used as remote backup protection of the next line; besides, according to the method, a circuit breaker tripping transient overvoltage criterion is introduced to judge whethe