摘要
为解决光伏电站远距离输送并网问题,同时提高光伏电站并网系统稳定性,将光伏电站与电压源型高压直流(Voltage Source Converter-High Voltage Direct Current,VSC-HVDC)输电系统相结合,设计了一种光伏电站通过级联直流变换器经VSC-HVDC输电线路并网拓扑方案。研究了光伏发电模块均压特性,分析了光伏发电模块控制策略和VSC换流站直流电压控制策略,提出了改进的直流电压-功率偏差斜率控制策略。在PSCAD/EMDTC电磁暂态软件下进行了不同光照强度仿真分析。仿真结果验证了系统可行性,表明了所提出控制策略有效保持光伏电站系统电压稳定性。
In order to solve long-distance integration of photovoltaic （PV） power station to power grid, and improve the system stability of grid-connected PV power station, the PV power station is integrated with voltage source converter high voltage direct current （VSC-HVDC） system, a topology of direct-current connecting cascaded photovoltaic power station to power grid via VSC-HVDC system is proposed. The voltage characteristics of PV module and the control strategy for PV module and DC voltage control strategy for VSC station are analyzed, thus, an improved control strategy of DC voltage margin ＆ droop is put forward. The system and proposed control strategy are simulated under PSCAD/EMDTC electromagnetic transient software by different irradiation conditions. Simulation results show the feasibility of the system, indicating that the proposed control strategy can effectively maintain the system voltage stability of PV power station.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2016年第13期14-19,共6页
Power System Protection and Control
关键词
光伏电站
电压源型高压直流输电系统
直流并网
直流电压偏差
直流电压斜率
photovoltaic station
voltage source converter high voltage direct current （VSC-HVDC）
DC integration
DC voltage margin
DC voltage droop
