摘要
柔性直流输电技术(VSC-HVDC)是新能源并网的一种重要手段,为了研究可再生能源经VSC-HVDC接入对大电网安全稳定运行的影响,本文建立了送端分别为光伏发电、水电和火电的三送端三受端的六端柔性直流输电仿真系统,对可再生能源经VSC-HVDC接入时的系统特性进行研究。送端中光伏并网系统为两极式并网结构,经LCL滤波电路接入柔性直流输电系统。选取了MPPT和双闭环控制算法后推导了LCL滤波电路的参数公式,在计算结果的基础上对多端柔性直流输电系统进行仿真。仿真结果表明在随机性较大的光伏发电接入后,六端柔性直流输电系统仍可稳定运行,验证了六端柔性直流输电系统仿真模型和参数计算的正确性,为大规模可再生能源并网的协调控制研究提供了仿真基础。
VSC-HVDC is an important means of new energy grid connection.To study the impact of renewable energy connected through VSC-HVDC on the safe and stable operation of the large power grid,this paper establishes a six-terminal flexible DC transmission simulation system with three transmission ends and three receiving ends for photovoltaic power generation,hydropower,and thermal power,respectively.The system characteristics of renewable energy connected through VSC-HVDC are studied.The photovoltaic grid connected system in the transmission end adopts a bipolar grid connected structure,which is connected to the flexible DC transmission system through an LCL filtering circuit.After selecting the MPPT and double closed-loop control algorithm,the parameter formula of the LCL filtering circuit was derived.Based on the parameter calculation results,simulation was conducted on the multi terminal flexible DC transmission system.The simulation results show that the six-terminal flexible and straight system can still operate stably after the photovoltaic connection with high randomness.The simulation results verify the correctness of the six-terminal flexible and straight system simulation model and parameter calculation established in this paper,which provides a simulation basis for the research of coordinated control during large-scale renewable energy grid connection.
作者
饶繁星
李浩然
王沄禾
杨小品
王翠
RAO Fanxing;LI Haoran;WANG Yunhe;YANG Xiaopin;WANG Cui(School of Electrical Engineering,Nanchang Institute of Technology,Nanchang 330099,China)
出处
《南昌工程学院学报》
CAS
2023年第3期47-52,共6页
Journal of Nanchang Institute of Technology
基金
江西省教育厅科学技术研究项目(GJJ211918,GJJ211942)
江西省自然科学基金重点项目(20224ACB204016)。
