采用新型模型预测的光伏虚拟同步机低电压穿越控制
Low-voltage Ride-through Control of Photovoltaic Virtual Synchronous Generator Using Novel Model Prediction
陈璐 1张溪 1党晓圆 1李洁 1冯铁成1
作者信息
- 1. 重庆移通学院智能工程学院,重庆 401520;公共大数据安全技术重庆市重点实验室,重庆 401520
- 折叠
摘要
在光伏逆变器中采用虚拟同步机VSG(virtual synchronous generator)策略,可以实现惯性和阻尼支撑,但传统VSG无法对系统提供暂态无功电压支撑,无法满足低电压穿越LVRT(low-voltage ride-through)期间对电压调节的需求.通常网侧发生接地故障后将光伏逆变器VSG控制切换至模型预测控制MPC(model predictive control),接地故障切除后由MPC切回至VSG控制策略.为了提升LVRT期间目标电流跟踪能力,在MPC控制中设置自适应目标函数.MATLAB/Simulink仿真和实验结果表明,所提新型模型预测的光伏虚拟同步机具备低电压穿越能力,LVRT期间MPC电流控制精确,MPC切换至VSG控制过程中无暂态电流冲击.
Abstract
The use of virtual synchronous generator(VSG)strategy for a photovoltaic(PV)inverter can achieve inertia and damping support.The traditional VSG cannot provide transient reactive voltage support for the system and cannot meet the demand for voltage regulation during the low-voltage ride-through(LVRT)periods.After the occurrence of a grounding fault,the VSG control of the PV inverter is switched to model predictive control(MPC).After the grounding fault is removed,the MPC is switched back to the VSG control strategy.To improve the target current tracking capability during the LVRT periods,an adaptive objective function is set in the MPC.MATLAB/Simulink simulation and experimental results show that the PV VSG under the novel MPC has an LVRT capability.During the LVRT periods,the MPC current control is precise,and there is no transient current surge during the switching from the MPC to VSG control.
关键词
虚拟同步机/光伏并网系统/低电压穿越/模型预测/平滑切换Key words
Virtual synchronous generator(VSG)/photovoltaic(PV)grid-connected system/low-voltage ride-through(LVRT)/model prediction/smooth switching引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据