华东多直流馈入系统换相失败预防和自动恢复能力的优化

根据华东电网2013年夏季大负荷方式BPA动态等值数据,在电磁暂态程序中采用了与直流工程控制保护一致的详细模型建立华东电网多直流馈入输电系统研究模型,实现了南瑞集团公司、许继集团有限公司以及ABB集团多种技术路线直流控制保护详细模型的有效结合。对华东地区六回直流工程中采用的换相失败预测方法和低压限流参数进行对比分析,给出各工程间参数的差异。在此基础上,研究了优化换相失败预测参数、增加定关断面积法、增大额定关断角对抵御换相失败的作用。最后,通过对低压限流环节参数和瞬时电流限制的研究,提出了直流换相失败后的恢复策略,研究结果可为直流系统运行提供技术参考。

Optimization of Commutation Failure Prevention and Automatic Recovery for East China Multi-infeed High-voltage Direct Current System

On the basis of the dynamical equivalent data of East China power system in big load mode in summer of 2013, a research model of AC/DC transmission system in East China is built in the electro-magnetic transient program. The multi-infeed DC transmission system identically based as the actual project is established, realizing the combination of NARI Group Corporation', XJ Group Corporation' and ABB Group's various detailed technical route models of high-voltage direct current (HVDC) control and protection. The commutation failure prediction methods and the low voltage current limiting parameters of the six HVDC projects in East China are at present compared and analyzed and the parameter differences among them are given. The effects on preventing the commutation failure of different methods, such as optimizing commutation failure parameters, increasing the constant extinction area, increasing the rated extinction angle, etc., are researched. Finally, according to research on the low voltage current limiting parameters and limits for the instantaneous current, the recovery strategy after HVDC commutation failure is presented. The research results are able to provide technical reference to the operation of the HVDC system. This work is supported by State Grid Corporation of China, Major Projects on Planning and Operation Control of Large Scale Grid (No. SGCC-MPLG001-2012).