水电送出型直流输电工程安全稳定研究

Study on power grid stability of hydropower DC transmission project

青海—河南特高压直流输电工程是青海水电及新能源外送的重要工程,是世界范围内首次将水电等清洁能源远距离大规模采用直流输电技术输送,该直流输电工程投运后将对电网实际运行带来新的安全稳定问题。为此,本文首先分析了水电送出型直流输电工程投运后电网的稳定特性;针对暂态过电压问题,从运行方式和网架补强两方面提出了优化控制措施。通过仿真计算验证了本文提出的运行方式,优化和网架补强方案能够保证过渡期水电及新能源的送出和直流的输电能力。

Qinghai-Henan UHVDC transmission project,the world’s first large-scale use of DC transmission technology to transport hydropower and new energy over a long distance,is important to hydropower and new energy transmission.After it is put into use,new security and stability problems of the power grid will arise.This paper first analyzes the power grid’s stability characteristics after this clean energy DC transmission project put into operation.For the transient problem,the optimal control measures were design and examine to adjust the operation mode and reinforce the grid.Simulations and analysis show that the optimized operation mode and grid reinforcing scheme ensure the transmission of hydropower and clean energy and the DC transmission capability in transition period.