摘要
针对模块化多电平变流器多端直流(MMC-MTDC)输电系统,考虑到实际工程中系统对直流电压、有功功率调节的准确性和快速性的要求,本文提出了一种新型的直流电压协调控制策略。基于直流电压斜率控制策略,本文将平移直流电压-有功功率(U-P)下垂曲线和改变U-P下垂曲线斜率相结合,提高了直流网络在功率发生不同程度变化时的动态响应速度,消除静态偏差,保证了MMC-MTDC直流电压稳定以及站间功率平衡。最后,在RT-lab实时仿真器中搭建了一个并联型四端直流输电系统,并对所提出的控制策略进行了稳态及暂态仿真分析,验证了其有效性。
For MMC-MTDC transmission system,taking the requirements of the accuracy and speed of DC voltage and active power regulation in the actual project into account,a novel DC voltage coordinated control strategy is proposed in this paper. The strategy combines translating U-P droop curve and changing the slope of U-P droop curve,thus improving dynamic response speed of DC network when power changes and eliminucting static bias,and ensures DC voltage stability and inter-station power balance in MMC-MTDC system. Finally,a parallel-type four-terminal DC transmission system is developed in RT-lab real-time simulator,and then,the analysis of steady and transient state is performed to validate the feasibility of the proposed novel DC voltage slope control strategy.
出处
《电测与仪表》
北大核心
2016年第6期1-7,共7页
Electrical Measurement & Instrumentation
基金
国家能源应用技术研究及工程示范项目(NY20150303)
