This paper presents a new inverter based on three-phase Boost/Buck-boost single-stage inverter. The basic configuration of the new topology and their fundamental principle are firstly introduced, the method of design ...This paper presents a new inverter based on three-phase Boost/Buck-boost single-stage inverter. The basic configuration of the new topology and their fundamental principle are firstly introduced, the method of design double-loop controller and sliding mode controller are clarified, analyzed and compared in the following. Finally the validity and feasibility of the new topology are tested by simulation. The results indicate that regulation of the voltage transfer ratio and output frequency can be realized optionally by the new converter, furthermore the harmonic distortion of waveform is low. So the inherent drawback of low voltage transfer ratio of traditional converter is effectively settled. This study may provide inspiration for further engineering application.展开更多
Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same bridge arm conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth le...Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same bridge arm conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth leg of the three-phase four-leg inverter so the three-phase four-leg inverter can work with unbalanced load. This paper presents a Z-source three-phase four-leg inverter which combines a Z-source network with three-phase four-leg inverter. The circuit uses simple SPWM modulation technique and the fourth bridge arm uses fully compensated control method. The inverter can maintain a symmetrical output voltage when the proposed scheme under the unbalanced load.展开更多
The traditional deadbeat control for UPS inverters has a robustness problem. The parametric imprecision can greatly harm the stability of the system, which restricts the application. A novel robust deadbeat control me...The traditional deadbeat control for UPS inverters has a robustness problem. The parametric imprecision can greatly harm the stability of the system, which restricts the application. A novel robust deadbeat control method is proposed in this paper to deal with the problem. In the proposed control method, a proportional element is added to the traditional deadbeat control in order to improve the robustness to parametric imprecision. To eliminate the error between output voltage and voltage reference caused by environmental noise and parametric deviation, a model reference adaptive regulator is also added to the control method. A 1kVA prototype is built based on DSP. Theoretical analysis and experimental results show that the robustness for parametric variation of the proposed method is much better than the traditional deadbeat control. The system can remain stable even when the systemic parameters have a large deviation from calculating parameters. The system has small static error and fast dynamic response with the new control method. This method is easy to realize in DSP and is suitable for full digital realization of UPS.展开更多
随着计算机技术及电力电子技术的快速发展,不间断电源(Uninterruptible Power Supply,UPS)的应用越来越广泛。逆变器是UPS系统中非常重要的一个部分,它是蓄电池与用户之间的桥梁,而逆变器故障是UPS系统的常见故障类型之一。UPS系统中一...随着计算机技术及电力电子技术的快速发展,不间断电源(Uninterruptible Power Supply,UPS)的应用越来越广泛。逆变器是UPS系统中非常重要的一个部分,它是蓄电池与用户之间的桥梁,而逆变器故障是UPS系统的常见故障类型之一。UPS系统中一旦逆变器发生故障,就会造成电能质量下降,甚至会引起其他部件的故障,因此快速、准确地定位逆变器故障对提高UPS系统的可靠性具有重要的意义。针对逆变器中单个、两个开关管开路故障及输出侧滤波电容失效故障进行故障诊断。首先模拟UPS系统中的三相逆变器的各种故障情况,得到各种情况下的输出电压波形,从而得到它们的电压矢量相位数据,之后将电压矢量相位数据输入卷积神经网络中进行训练,进而利用训练好的卷积神经网络模型实现UPS系统逆变器故障诊断和定位。最后,仿真结果表明所提出的故障诊断策略具有非常高的效率及准确率。展开更多
为了改善逆变电源的输出性能,提高逆变电源输出响应速度和精度,研究了无差拍控制策略地数字化UPS(Uninterruptible Power Supply)逆变系统中的应用,给出了无差拍控制的数学建模方法,并采用Matlab/Simulink进行了仿真研究。经过理论分析...为了改善逆变电源的输出性能,提高逆变电源输出响应速度和精度,研究了无差拍控制策略地数字化UPS(Uninterruptible Power Supply)逆变系统中的应用,给出了无差拍控制的数学建模方法,并采用Matlab/Simulink进行了仿真研究。经过理论分析和仿真结果表明,采用无差拍控制策略设计的控制器用于逆变电源系统具有的突出优点是响应速度快,可大幅提高系统的动态响应性能。展开更多
文摘This paper presents a new inverter based on three-phase Boost/Buck-boost single-stage inverter. The basic configuration of the new topology and their fundamental principle are firstly introduced, the method of design double-loop controller and sliding mode controller are clarified, analyzed and compared in the following. Finally the validity and feasibility of the new topology are tested by simulation. The results indicate that regulation of the voltage transfer ratio and output frequency can be realized optionally by the new converter, furthermore the harmonic distortion of waveform is low. So the inherent drawback of low voltage transfer ratio of traditional converter is effectively settled. This study may provide inspiration for further engineering application.
文摘Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same bridge arm conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth leg of the three-phase four-leg inverter so the three-phase four-leg inverter can work with unbalanced load. This paper presents a Z-source three-phase four-leg inverter which combines a Z-source network with three-phase four-leg inverter. The circuit uses simple SPWM modulation technique and the fourth bridge arm uses fully compensated control method. The inverter can maintain a symmetrical output voltage when the proposed scheme under the unbalanced load.
文摘The traditional deadbeat control for UPS inverters has a robustness problem. The parametric imprecision can greatly harm the stability of the system, which restricts the application. A novel robust deadbeat control method is proposed in this paper to deal with the problem. In the proposed control method, a proportional element is added to the traditional deadbeat control in order to improve the robustness to parametric imprecision. To eliminate the error between output voltage and voltage reference caused by environmental noise and parametric deviation, a model reference adaptive regulator is also added to the control method. A 1kVA prototype is built based on DSP. Theoretical analysis and experimental results show that the robustness for parametric variation of the proposed method is much better than the traditional deadbeat control. The system can remain stable even when the systemic parameters have a large deviation from calculating parameters. The system has small static error and fast dynamic response with the new control method. This method is easy to realize in DSP and is suitable for full digital realization of UPS.
文摘随着计算机技术及电力电子技术的快速发展,不间断电源(Uninterruptible Power Supply,UPS)的应用越来越广泛。逆变器是UPS系统中非常重要的一个部分,它是蓄电池与用户之间的桥梁,而逆变器故障是UPS系统的常见故障类型之一。UPS系统中一旦逆变器发生故障,就会造成电能质量下降,甚至会引起其他部件的故障,因此快速、准确地定位逆变器故障对提高UPS系统的可靠性具有重要的意义。针对逆变器中单个、两个开关管开路故障及输出侧滤波电容失效故障进行故障诊断。首先模拟UPS系统中的三相逆变器的各种故障情况,得到各种情况下的输出电压波形,从而得到它们的电压矢量相位数据,之后将电压矢量相位数据输入卷积神经网络中进行训练,进而利用训练好的卷积神经网络模型实现UPS系统逆变器故障诊断和定位。最后,仿真结果表明所提出的故障诊断策略具有非常高的效率及准确率。
文摘为了改善逆变电源的输出性能,提高逆变电源输出响应速度和精度,研究了无差拍控制策略地数字化UPS(Uninterruptible Power Supply)逆变系统中的应用,给出了无差拍控制的数学建模方法,并采用Matlab/Simulink进行了仿真研究。经过理论分析和仿真结果表明,采用无差拍控制策略设计的控制器用于逆变电源系统具有的突出优点是响应速度快,可大幅提高系统的动态响应性能。
