摘要
随着近年来能源危机的日益加重以及部分地区供电紧张、能源分布不合理问题,光伏电站经VSC-HVDC(voltage source converter-high voltage direct current)并网已经成为一种迫切的需求。首先研究得出并网系统的整个启动控制过程,并提出了定交流母线电压控制与定直流电压-功率斜率控制相结合的启动控制策略,缓解并网系统启动时电流电压的大幅度波动对自身和电网带来的冲击。仿真结果显示,该启动控制过程与控制策略的结合能够实现系统无冲击启动并正常进入额定工况稳定运行。随后根据光照强度随机性的特点,提出混合粒子群算法对并网系统的控制器进行优化,平抑光伏电站并网时的功率波动。仿真结果显示,该算法优于单一的粒子群算法,平抑光伏电站输出功率波动的效果更加显著。
With the growing of energy crisis,the shortage of power supply in some areas and the unreasonable distribution of energy,it is urgent that the PV power station is connected by Voltage Source Converter-High Voltage Direct Current(VSC-HVDC).Firstly,the whole start-up control process of the grid-connected system is studied and obtained,and a start-up control strategy combining the constant AC bus voltage control with the constant DC/DC voltage-slope control is proposed to alleviate the impact on itself and the grid due to the large fluctuation of the current and voltage at the start-up of grid-connected system.The simulation results show that the combination of the start control process and control strategy can achieve the system start-up without impact and go normally into the rated operating conditions and stable operation.Then,according to the characteristics of the randomness of light intensity,a hybrid particle swarm optimization algorithm is proposed to optimize the controller of the grid-connected system and stabilize the power fluctuation when the PV power station is connected.The simulation results show that the algorithm is superior to the single particle swarm algorithm,and the effect of stabilizing the output power fluctuation of the PV power station is more remarkable.
作者
于小艳
李国宁
YU Xiaoyan;LI Guoning(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2018年第21期55-62,共8页
Power System Protection and Control
基金
国家自然科学基金项目资助(61164010)~~
