Herein,we propose a novel three-phase quasi-Z-source inverter with a high voltage transmission ratio to address challenges such as high switching loss and sizeable magnetic components in the basic quasi-Z-source inver...Herein,we propose a novel three-phase quasi-Z-source inverter with a high voltage transmission ratio to address challenges such as high switching loss and sizeable magnetic components in the basic quasi-Z-source inverter.The proposed circuit topology,control strategy,and related analysis are presented.The circuit topology of the inverter comprises a quasi-Z-source network with an integrated magnetic inductor,an active clamp circuit,a three-phase inverter bridge,and an output LC filter,all of which are connected in series.An improved 12-sector space vector modulation scheme is proposed based on the root-mean-square value of the voltage and the instantaneous value of the current.Furthermore,analyses of the inverter voltage transmission ratio,resonant process,and parametric design guidelines for integrated magnetic inductor and zero-voltage switching conditions are presented.Experimental results on a 1-kVA prototype inverter demonstrate that the proposed inverter exhibits a higher transmission ratio and efficiency than existing inverters;thus,the proposed inverter would have broad prospects in low-voltage DC-AC applications.展开更多
The inherent double-line frequency ripple(DFR)of the single-phase quasi-Z-Source inverter(qZSI)strongly affects performance and design of the whole system,which requires hardware improvement methods such as additional...The inherent double-line frequency ripple(DFR)of the single-phase quasi-Z-Source inverter(qZSI)strongly affects performance and design of the whole system,which requires hardware improvement methods such as additional semiconductor components or increasing the volume of capacitors and inductors.As a result,hardware solutions increase the price,and the volume and also reduces reliability of the system.In this paper,as a non-hardware solution,a sliding mode control(SMC)method is presented to control the voltage of the qZSI capacitor.To suppress the DFR,a second-order harmonic is injected into the capacitor reference voltage.Simulation and experimental results show that the introduced controller will have satisfactory results in reducing the DFR without any hardware changes in the qZSI,such as increasing the volume of the capacitor and inductor,adding a semiconductor,or increasing the frequency.A simulation model and experimental prototype are provided to demonstrate the validation of the effectiveness of the proposed controller.展开更多
针对传统的quasi-Z源电机驱动系统效率低、体积大等缺点,提出了一种新型的脉冲宽度幅值调制PWAM(pulse-width-amplitude-modulation)方法。与其他广泛应用于电机驱动系统中的PWM方法有很大不同,该调制方法中每个调制周期内只有一个桥臂...针对传统的quasi-Z源电机驱动系统效率低、体积大等缺点,提出了一种新型的脉冲宽度幅值调制PWAM(pulse-width-amplitude-modulation)方法。与其他广泛应用于电机驱动系统中的PWM方法有很大不同,该调制方法中每个调制周期内只有一个桥臂的上下开关管进行PWM的开关动作。因此,整个逆变器的开关动作和开关损耗大大减少,电机驱动系统的效率也随之提高;与传统PWM方法相比,混合调制方法所需的电感、电容明显减小,这使得系统的体积减小,经济性更强。通过建立1 k W的quasi-Z源逆变器仿真模型,其仿真结果验证了基于PWAM的磁场定向控制的永磁同步电机具有良好的运行结果。展开更多
In power converter control,predictive control has several merits,such as simple concept and fast response.However,the necessity to use the weighting factor inside the cost function makes the control design complex in ...In power converter control,predictive control has several merits,such as simple concept and fast response.However,the necessity to use the weighting factor inside the cost function makes the control design complex in the case of regulating multivariables where the value of the weighting factor is obtained by a nontrivial process.Also,it primarily depends on the system parameters and operating points of the control system.This paper aims to enhance the model predictive algorithm of the singlestage topology of a quasi-Z Source Inverter(qZSI).The concept of a multi-objective optimization approach is used in addition to the sub-cost function definition to remove the weighting factors.By using the sub-cost function definition,the inductor current is pushed away from the main loop of the predictive algorithm.Thus,no weighting factor is needed to manage the priority of the inductor current.The other two control targets,which are the capacitor voltage and load currents,will be controlled by the multi-objective optimization approach without using any weighting factors.A detailed theoretical analysis of the proposed technique will be given and validated based on simulation results.展开更多
针对传统准Z源逆变器QZSI(quasi-Z-source inverter)升压能力和功率协调控制能力的不足,提出将储能电池与开关电感型准Z源逆变器相结合,构成储能型开关电感准Z源逆变器ES-SLQZSI(energy-storage switched-inductor QZSI),提高了系统升...针对传统准Z源逆变器QZSI(quasi-Z-source inverter)升压能力和功率协调控制能力的不足,提出将储能电池与开关电感型准Z源逆变器相结合,构成储能型开关电感准Z源逆变器ES-SLQZSI(energy-storage switched-inductor QZSI),提高了系统升压倍数和功率协调能力。针对ES-SLQZSI系统,提出一种基于有限集模型预测控制FCS-MPC(finite control set-model predictive control)结构的功率控制策略,在单级变换系统中实现了最大功率点追踪MPPT(maximum power point tracking)和并网功率控制。建立ES-SLQZSI的离散时间模型,并基于此模型设计了预测函数与代价函数,然后设计了光伏功率MPPT模块和输出功率管理模块。相比于传统多级结构的储能光伏系统,所提系统结构简单,无需额外的DC-DC变换器。相比于传统双环PI+PWM控制策略,所提方法简单易行,所需PI控制器少,无需PWM调制器,且动态响应速度优良,适合被控变量较多的非线性系统。仿真结果验证了所提控制策略的有效性。展开更多
基金the National Natural Science Foundation of China(Grant No.51537001)Fund of“Taishan Scholar”Climbing Plan of Shandong Province,China。
文摘Herein,we propose a novel three-phase quasi-Z-source inverter with a high voltage transmission ratio to address challenges such as high switching loss and sizeable magnetic components in the basic quasi-Z-source inverter.The proposed circuit topology,control strategy,and related analysis are presented.The circuit topology of the inverter comprises a quasi-Z-source network with an integrated magnetic inductor,an active clamp circuit,a three-phase inverter bridge,and an output LC filter,all of which are connected in series.An improved 12-sector space vector modulation scheme is proposed based on the root-mean-square value of the voltage and the instantaneous value of the current.Furthermore,analyses of the inverter voltage transmission ratio,resonant process,and parametric design guidelines for integrated magnetic inductor and zero-voltage switching conditions are presented.Experimental results on a 1-kVA prototype inverter demonstrate that the proposed inverter exhibits a higher transmission ratio and efficiency than existing inverters;thus,the proposed inverter would have broad prospects in low-voltage DC-AC applications.
文摘The inherent double-line frequency ripple(DFR)of the single-phase quasi-Z-Source inverter(qZSI)strongly affects performance and design of the whole system,which requires hardware improvement methods such as additional semiconductor components or increasing the volume of capacitors and inductors.As a result,hardware solutions increase the price,and the volume and also reduces reliability of the system.In this paper,as a non-hardware solution,a sliding mode control(SMC)method is presented to control the voltage of the qZSI capacitor.To suppress the DFR,a second-order harmonic is injected into the capacitor reference voltage.Simulation and experimental results show that the introduced controller will have satisfactory results in reducing the DFR without any hardware changes in the qZSI,such as increasing the volume of the capacitor and inductor,adding a semiconductor,or increasing the frequency.A simulation model and experimental prototype are provided to demonstrate the validation of the effectiveness of the proposed controller.
文摘针对传统的quasi-Z源电机驱动系统效率低、体积大等缺点,提出了一种新型的脉冲宽度幅值调制PWAM(pulse-width-amplitude-modulation)方法。与其他广泛应用于电机驱动系统中的PWM方法有很大不同,该调制方法中每个调制周期内只有一个桥臂的上下开关管进行PWM的开关动作。因此,整个逆变器的开关动作和开关损耗大大减少,电机驱动系统的效率也随之提高;与传统PWM方法相比,混合调制方法所需的电感、电容明显减小,这使得系统的体积减小,经济性更强。通过建立1 k W的quasi-Z源逆变器仿真模型,其仿真结果验证了基于PWAM的磁场定向控制的永磁同步电机具有良好的运行结果。
基金supported in part by the Estonian Research Council grant PUT1443in part by the Estonian Centre of Excellence in Zero Energy and Resource Efficient Smart Buildings and Districts,ZEBE,grant 2014-2020.4.01.15-0016 funded by the European Regional Development Fund.
文摘In power converter control,predictive control has several merits,such as simple concept and fast response.However,the necessity to use the weighting factor inside the cost function makes the control design complex in the case of regulating multivariables where the value of the weighting factor is obtained by a nontrivial process.Also,it primarily depends on the system parameters and operating points of the control system.This paper aims to enhance the model predictive algorithm of the singlestage topology of a quasi-Z Source Inverter(qZSI).The concept of a multi-objective optimization approach is used in addition to the sub-cost function definition to remove the weighting factors.By using the sub-cost function definition,the inductor current is pushed away from the main loop of the predictive algorithm.Thus,no weighting factor is needed to manage the priority of the inductor current.The other two control targets,which are the capacitor voltage and load currents,will be controlled by the multi-objective optimization approach without using any weighting factors.A detailed theoretical analysis of the proposed technique will be given and validated based on simulation results.
文摘针对传统准Z源逆变器QZSI(quasi-Z-source inverter)升压能力和功率协调控制能力的不足,提出将储能电池与开关电感型准Z源逆变器相结合,构成储能型开关电感准Z源逆变器ES-SLQZSI(energy-storage switched-inductor QZSI),提高了系统升压倍数和功率协调能力。针对ES-SLQZSI系统,提出一种基于有限集模型预测控制FCS-MPC(finite control set-model predictive control)结构的功率控制策略,在单级变换系统中实现了最大功率点追踪MPPT(maximum power point tracking)和并网功率控制。建立ES-SLQZSI的离散时间模型,并基于此模型设计了预测函数与代价函数,然后设计了光伏功率MPPT模块和输出功率管理模块。相比于传统多级结构的储能光伏系统,所提系统结构简单,无需额外的DC-DC变换器。相比于传统双环PI+PWM控制策略,所提方法简单易行,所需PI控制器少,无需PWM调制器,且动态响应速度优良,适合被控变量较多的非线性系统。仿真结果验证了所提控制策略的有效性。
