摘要
虚拟同步发电机因能为电网提供电力电子装置渗透率提高所降低的惯性和阻尼而得到广泛关注。虚拟同步发电机采用PWM控制输送电网电流,但需要PWM波调制和PI控制。基于此,提出了虚拟同步发电机电流模型预测控制策略,以无需PWM波调制和PI控制的模型预测控制来弥补PI调制参数复杂、调制困难的缺陷,同时提高灵活度,增强鲁棒性。采样变换器的输出电流经虚拟同步发电机和电流预测模型分别生成参考电流、预测电流,根据代价函数,选取8种开关矢量中误差最小的一组作用于变换器,形成电流闭环控制。所提控制策略结构简单,灵活易操作,能在为电网提供惯性和阻尼的同时,还提供有功和无功功率支撑。仿真和实验验证了所提策略的有效性。
The virtual synchronous generator(VSG)is widely concerned because it can provide inertia and damping which are reduced due to the increasing permeability of power electronic devices.It uses PWM control to transmit grid current under the premise of PWM wave modulation and PI control.On this basis,a current model predictive control(MPC)strategy for VSG is proposed,which uses MPC instead of PWM or PT control to make up for the defects of complex PI modulation parameters and difficulty in modulation.Meanwhile,the flexibility is improved,and the robustness is intensified.The reference current and predictive current are generated by the VSG and current predictive model respectively from the output current from the sampling converter.According to the cost function,the group of eight switching vectors which has the least error is selected to act on the converter to form the current closed-loop control.The proposed control strategy is simple in structure and flexible and easy to operate,which can provide inertia and damping for power grid,as well as the active and reactive power support.Simulation and experimental results verified the effectiveness of the proposed strategy.
作者
李琰琰
赵亚谦
郭磊磊
金楠
胡石阳
LI Yanyan;ZHAO Yaqian;GUO Leilei;JIN Nan;HU Shiyang(College of Electrical and Information Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)
出处
《电源学报》
CSCD
北大核心
2022年第6期146-154,共9页
Journal of Power Supply
基金
国家自然科学基金资助项目(U2004166)
河南省高等学校重点科研项目(20A470011)
河南省重点研发与推广专项(科技攻关)资助项目(202102210103)。
关键词
虚拟同步发电机
电流模型预测控制
代价函数
virtual synchronous generator(VSG)
current model predictive control
cost function
