送端孤岛直流系统与火电机组配合起动方法

Coordinated Starting of Thermal Power Generating Units With Islanded Sending End of HVDC Power System

火电机组响应特性较慢而直流系统响应较快,因此大型火电能源基地采用孤岛方式经直流送出时,会遇到直流系统与火电机组配合起动的问题。分析和提出了超/特高压直流工程最小直流起动功率,采用实时数模混合仿真工具研究了直流系统与火电机组特性的起动配合方案和过程。对采用不同类型调速器的机组特性和直流起动的配合及参数优化取值进行了详细仿真。论证了机组起动能力与直流起动过程中的频率控制的可行性。研究结果可为大型电源基地输电工程规划、工程建设和运行等工作提供技术参考。

ABSTRACT：The response of thermal power generating units is slower than that of HVDC power system, so the coordinated stating of thermal power generating units with islanded sending end of HVDC power system occurs when large-scale thermal power energy base sends out power by islanded sending end via HVDC power system. The minimum DC starting power of UHV/EHV DC power transmission project is put forward and analyzed, and the coordinated starting scheme of HVDC power system with thermal generator characteristics as well as the starting process are researched by real-time mixed digital-analog simulation tool. Detailed simulation of the coordination of unit characteristics adopting different governors with HVDC power system and the value-fetching of optimized parameters are performed, and the starting ability of generating units and the feasibility of frequency control during the starting process of HVDC system are expounded and proved. Results of this research are available for reference to project planning, engineering construction and operation of power transmission for large-scale energy base.