光伏并网逆变系统无差拍预测直接功率控制方法

A Deadbeat Predict Power Control Method for Photovoltaic Grid-connected Inverter System

研究了一种光伏并网逆变系统无差拍预测直接功率控制(DPC)方法。该方法以电压源型逆变器(VSI)并网逆变系统离散预测模型为基础,分析了不同扇区中电压矢量对系统有功、无功功率的影响趋势,选取一个包含两个有效电压矢量和一个零电压矢量的3矢量序列,并给出功率无差拍跟踪时的矢量作用时间求取方法。针对系统动态过程中存在的负矢量作用时间问题,给出了有效电压矢量作用时间调整方法。最后,基于55 kW光伏发电实验样机对所提控制方法进行性能验证。实验结果表明,该方法可实现光伏并网逆变系统动、稳态性能的有效提升,保证了光伏发电系统并网接入点的电能品质。

A photovoltaic grid inverter system deadbeat forecast direct power control（DPC） method is stuthed.This method takes the voltage source inverter（VSI） discrete forecast model based on grid inverter system,and analyses the voltage vector in different sectors will effect the active and reactive power of the system.A contains two effective voltage vector and vector sequence is picked up.A zero voltage vector 3 implements the VSI power system steady state has no difference frequency tracking control.Aiming at the negative vector function that exist in the dynamic process of the system time,and the effective voltage vector function time adjustment method is given.Finally,based on 55 kW photovoltaic experimental prototype of performance is carried out to verify the proposed control method.The experimental results show that the method can realize photovoltaic grid inverter system improve the dynamic and steady-state per-formance,and guarantee the grid access point of power quality photovoltaic power generation system.