含风电接入多端直流输电系统的建模仿真

Modeling and Simulation of Multiterminal HVDC Transmission System with Wind Power Transmission Network

阐述了风电入网的多端柔性直流输电系统的运行及建模,介绍了如何运用闭环控制器实现多端直流输电系统的稳定运行,功率输出端接入风电机组,加入了风速变化及功率补偿研究系统波动时的稳定性.在PSCAD/EMTDC平台上建立了四端的柔性直流系统,其中两端为发送端,由一个电压源端口以及一个风电机组端口组成,两端为受端电网,每个端口通过模块化多电平变流器完成电流交直流的转换,汇入直流电网.各个换流站接收站级控制和系统控制的调控指令实现整个电网的协调运行,达到风电接入电网稳态运行的目的.

This paper expounds the operation and modeling of the flexible DC transmission system,and introduces how to realize the rapid response and real-time monitoring of the multiterminal HVDC system through multi-level coordination control.At the same time,the wind power unit is connected to the wind turbine and the response of the wind power and network system is studied by simulating the start and operation of the wind turbine.On the PSCAD platform,a flexible DC system with four ends is set up,in which both ends are the sending end wind turbines,both ends are the receiving end grid,and the current is converted through two modularized multilevel converters on each port,and the control commands of each converter station receiving station level control and system level control realize the coordinated operation of the whole power grid.The wind power is connected to the steady state of the power grid.