摘要
传统PWM整流器预测电流控制需借助交流电压传感器测量电网电压,针对电压传感器硬件成本高、安装困难及可靠性低等问题,提出将虚拟磁链引入PWM整流器预测电流控制方法中。建立两相静止坐标系下PWM整流器虚拟磁链数学模型,采用带有补偿项的一阶低通滤波器代替纯积分环节对电网虚拟磁链进行估计,解决因纯积分环节带来的积分初值和直流偏置问题,利用虚拟磁链计算瞬时功率和电网电压矢量幅值及相角,结合预测电流控制方法建立PWM整流器无电压传感器预测电流控制系统。仿真结果表明无电压传感器预测电流控制系统电网电压及电流相位同步,电网电流谐波畸变率低,直流母线电压准确跟踪其指令值,表明所提方法的有效性和可行性。
Traditional predictive current control（ PCC） strategy of PWM rectifier needs AC voltage sensor for measuring voltage. Aiming at the problem of high hardware cost,installing difficulty and low reliability,virtual flux（ VF） was introduced into PCC. And pure integrator was replaced by first order lower pass filter with compensation term for virtual flux. For considering integral initial value and DC drift,instantaneous active and reactive power were calculated under VF mathematical mode in two-phase static coordinate,besides the amplitude and phase angle of power voltage vector were achieved. Combining with PCC strategy,a PCC method without voltage sensor for PWM rectifier was proposed. The simulation results show that VCC system without AC voltage sensor operates on the state of synchronization of AC voltage and current,has lower current total harmonic distortion and better tracking character of DC voltage. And the results illustrate the effectiveness and the feasibility for PCC without voltage sensor based on VF.
出处
《电子测量与仪器学报》
CSCD
北大核心
2016年第5期817-823,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(60874077)
高等学校博士点专项科研基金(20060056054)
国家质检公益性行业科研专项项目(2007GYB172)
国家质检总局科技计划项目(2012QK293)资助
关键词
瞬时功率
预测电流控制
虚拟磁链
积分初值
直流偏置
instantaneous power
predictive current control
virtual flux
integral initial value
DC drift
