非工频运行风力发电系统保护用大容量框架断路器电弧开断特性研究

项目名称： 非工频运行风力发电系统保护用大容量框架断路器电弧开断特性研究

项目编号： No.51507136

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 电工技术

项目作者： 汪倩

作者单位： 西安理工大学

项目金额： 21万元

中文摘要： 永磁同步发电机与全功率双PWM变流器相结合的新技术是大功率、并网型风力发电机组的发展方向，但机侧工作频率变化范围大、工作电压高，给短路保护用框架断路器提出了新的、更高要求。本项目拟围绕框架断路器在更高电压、非工频条件下的电弧开断特性这一关键科学问题，结合多物理场耦合仿真和微观、定量诊断技术，从获取弧后非平衡态、多组分空气介质的物性参数及临界击穿场强特性等基础数据，掌握电压、频率对多触头并联空气电弧演变特性的影响规律，提出新型触头灭弧系统的设计原理和方法等三个方面开展研究工作。从而解决更高电压、非工频条件下，多并联触头间及三相间电弧的相互作用机制，电弧电流过零后的弧后击穿有效抑制与评价方法，以及新型灭弧系统的优化设计等理论和关键技术问题，实现机电特性匹配。研究有助于丰富和发展空气开关电弧理论，为新的应用背景下框架断路器自主创新研发及性能提升提供科学的理论基础，有效地服务于我国风力发电的发展。

中文关键词： 电弧特性；断路器；非工频；灭弧；风力发电

英文摘要： The new technology combining permanent magnet synchronous generator and full power dual PWM converter is the development trend of the large power and grid integration wind turbine. However, for the generator side, the working frequency is variable, and the output voltage is higher, which brings the severer protection problems for the air circuit breakers (ACB).This project will focus on the simulation and experimental studies of the arc interruption characteristics under the conditions of the higher voltage, variable frequency, from the following three points: calculating the post-arc physical parameters and the critical breakdown strength properties for the non-equilibrium and multi-component air, understanding the influence of voltage and frequency on the multiple parallel contacts air arc evolution, and proposing the design principle and method for the new type arc quenching system. It aims to solve the interaction mechanism of multiple parallel contacts and three-phase air arcs, the method to restrain and evaluate the post-arc breakdown, and the optimization design of the arc quenching chamber under the conditions of the higher voltage and variable frequency. Through this project, the prospective achievements could enrich and develop the theory of air switching arc, provide scientific theoretical basis for independent innovation and performance improvement of ACB under this new application background, and serve the development of the wind power.

英文关键词： arc characteristics;circuit breaker;variable power frequency;arc extinguishment;wind power