摘要
多个交流电网间直流互联的需求日益增强,采用多端直流(MTDC)输电线路相比于多条点对点直流线路可极大地降低投资成本和运行费用。为此,介绍了MTDC输电系统相比于两端直流输电系统的特点,阐述了MTDC输电系统在我国的应用前景;描述了MTDC输电系统的串联接线方式和并联接线方式,并着重对并联接线方式的控制策略进行了说明。针对PSS/E中的MTDC输电系统结构和控制方式,详细介绍了PSS/E中的3种MTDC系统动态模型,即MTDC01、MTDC02和MTDC03模型。并构建一个4端直流系统对MTDC01模型进行测试,考察了交流系统故障和直流系统内部故障时整个交直流系统的动态特性。仿真结果表明PSS/E多端直流模型能够很好地模拟MTDC系统正常运行和交直流故障下的动态响应,满足大规模交直流系统仿真的要求。
Connecting multiple AC power grids with DC lines has been an increasing demand. Compared with using point-to-point DC transmissions for the connection, using multi-terminal direct current （MTDC） transmission can greatly reduce the cost of investment and operation. To evaluate applicability of multi-terminal direct current in large-scale power systems, we discussed the characteristics of MTDC systems and compared them with those of bi-terminal DC systems. Moreover, we described the potential applications of MTDC systems in China, and presented two main topologies of connecting converters in MTDC systems, i.e. the series connection and the parallel connection, where the latter control- ling strategy is emphatically illustrated. Furthermore, we discussed the configurations and control strategies of the MTDC systems in PSS/E in detail, and reviewed the three power flow and dynamic models for MTDC systems in PSS/E, i.e. MTDC01, MTDC02 and MTDC03, as well as their parameter settings. Using the pseudo steady-state MTDC dynamic model MTDC01, we numerically tested an example quadri-terminal system to obtain the dynamic response of the system under AC or DC faults. The results show that using the models of PSS/E can commendably simulate a system＇s dynamic response in steady-state operation and under AC/DC systems faults, satisfying the requirements of simulating large-scale AD/DC power systems.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第2期580-587,共8页
High Voltage Engineering
基金
国家高技术研究发展计划(863计划)(2011AA05A119)
国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001-031-2012)~~
