适用于新型电力系统的线路分侧阻抗差动保护方法及系统
By employing a protection method combining offset characteristic impedance elements and differential elements in new power systems, highly sensitive fault phase identification and differentiation are achieved, solving the problems of insufficient sensitivity of current differential protection and incorrect operation of distance protection. This method is applicable to various situations where the two sides of the line are respectively new power systems and synchronous power supply systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING SIFANG JIBAO ENG TECH
- Filing Date
- 2023-09-20
- Publication Date
- 2026-07-17
AI Technical Summary
In new power systems, the high proportion of renewable energy and power electronic equipment integration leads to problems such as insufficient sensitivity of current differential protection and possible incorrect operation of distance protection. Especially under nonlinear fault characteristics, existing protection technologies have difficulty accurately identifying the fault direction and taking action.
The protection method combines offset characteristic impedance elements with differential elements. Through highly sensitive differential current phase selection and impedance measurement discrimination, combined with the operation discrimination of differential elements, the faulty phases can be accurately identified and distinguished, thereby improving the sensitivity of the protection device.
It improves the sensitivity of protection devices in new power systems, solves the problems of insufficient sensitivity of current differential protection and incorrect operation of distance protection, and is suitable for various situations where the two sides of the line are new power systems and synchronous power supply systems respectively.
Smart Images
Figure CN117394287B_ABST