Multi-level wheel-stage interlocking island protection method applicable to large-scale new energy power station

Abstract

The invention discloses a multi-level wheel-stage interlocking island protection method applicable to a large-scale new energy power station. The multi-level wheel-stage interlocking island protection method comprises the following steps: (1) determining the constant value of island protection characteristic quantity according to the stability domain degree of the large-scale new energy power station system, and stably dividing the system into a plurality of levels; (2) generating corresponding logic expression according to the type of each interval equipment of the large-scale new energy power station and exit matrix configuration; (3) generating wheel-stage interlocking logic; and (4) identifying stable levels of the system after an island phenomenon occurs by calculating a characteristic variable value in real time, and acting on an exit matrix according to a wheel-stage interlocking logic distinguishing result so as to guarantee the rapidity and reliability of exit tripping. The method is applied to a wheel-stage interlocking logic method, the problem of overcutting appearing in the island protection process of the large-scale new energy power station is prevented, the method has higher automation level, the operation process can be simplified, the operation and maintenance costs are reduced, the reliability of operation is improved, and the method has extensive applicability at the same time.

Description

technical field [0001] The invention relates to a multi-layer wheel-level interlocking island protection method suitable for large-scale new energy power plants, and belongs to the technical field of new energy. Background technique [0002] Compared with the traditional grid power station system, the new energy power station system is smaller in scale. In order to meet the different needs of various regions, it often includes a variety of power equipment, such as grid-connected switches, energy storage inverters, distributed power sources, loads, etc. When the main network stops power supply due to specific reasons, the new energy power station and the surrounding power loads will form an island phenomenon. The occurrence of unplanned island phenomenon will bring unpredictable harm to system equipment and related personnel. The current construction of new energy power plants has the characteristics of large power generation capacity, complex grid connection methods, and mul...

AI Technical Summary

Problems solved by technology

The current construction of new energy power plants has the characteristics of large power generation capacity, complex grid connection methods, and multiple energy storage inverter configurations. When the island phenomenon occurs, various combinations of large-scale new energy power plants have formed a variety of operating states. , the stability characteristics of the system are not the same under various states. The existing island protection methods often cause overcutting of loads and power generation equipment, expand the scope of power outages, and reduce the utilization rate of new energy.

Images