基于阀电压的关断角计算方法对HVDC系统运行性能的影响  

Influence of Valve Voltage-based Extinction Angle Calculation Method on Performance of HVDC System

作　　者：李婷[1] 贺恒鑫[1] 周志成 谢天喜 何俊佳[1] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]江苏省电力公司电力科学研究院,南京211103

出　　处：《高压电器》2015年第3期35-40,共6页High Voltage Apparatus

摘　　要：HVDC系统常在逆变侧采用定关断角控制控制系统的运行电压,闭环型定关断角控制的性能与采用的关断角计算方法密切相关,用阀电压计算关断角概念直接、简单。在阐述基于阀电压的关断角计算原理,讨论该计算方法与PI控制的配合的基础上,在PSCAD中建立了基于阀电压的关断角计算仿真模型,应用于PSCAD软件的CIGRE标准控制系统中,针对CIGRE标准测试系统进行了稳态与故障的仿真,并且将结果与应用PSCAD中的关断角计算模型的仿真结果进行了对比。仿真结果表明,基于阀电压的关断角计算方法具有良好的静态控制特性,在故障后具有一定的保护功能,故障后系统的恢复性能较差,但对过电压的影响较小,可以应用于过电压的计算。Constant extinction angle control is usually used in the inverter control strategy of HVDC system, and the performance of closed-loop constant extinction angle control relies on the extinction angle calculation method.The concept of using valve voltage to calculate extinction angel is simple. In this paper, the principle of extinction angle calculation method based on valve voltage and the combination of the method with the closed-loop PI control are elaborated, and an extinction angle calculation model is built up in the software PSCAD. The proposed model is applied to the PSCAD＇s COGRE standard control system to conduct steady-state and fault simulations, and the results are compared with that of the corresponding model existing in PSCAD. It is concluded that the proposed valve voltage-based extinction angel calculation method achieves good static control characteristics, and has certain protective function in fault condition. However, its HVDC response characteristics are not satisfactory but the effect on overvoltage is small. As a result, the proposed method can be applied to calculation of overvoltage.

关 键 词：HVDC 定关断角控制 关断角计算 PI控制 阀电压 换相失败 

分 类 号：TM721.1[电气工程—电力系统及自动化]