In recent years, a rapid decrease in the cost of various energy storage technologies and their integration into grid becomes a reality with the advent of smart grid. The Dynamic Voltage Restorer (DVR) is a custom powe...In recent years, a rapid decrease in the cost of various energy storage technologies and their integration into grid becomes a reality with the advent of smart grid. The Dynamic Voltage Restorer (DVR) is a custom power device that has an excellent dynamic capability used to provide voltage sag, swell compensation in distribution systems. Among the energy storage devices, Ultra-Capacitors (UCAP) have ideal characteristics such as high power and low energy density essential for the compensation of voltage sag and swell, which require high power for short interval of time. This paper presents an integration of rechargeable UCAP with DVR. This UCAP-DVR presents a modular, flexible system configuration that will have an active power capability and also provide deep, extended mitigation for power quality problems. The DVR is integrated into UCAP via bidirectional DC-DC converter which supports a rigid dc-link voltage for DVR and also helps in compensating temporary voltage sag and swell. FUZZY LOGIC Controller is used to enhance the performance of UCAP-DVR. The simulation model for the proposed system has been developed in MAT-LAB and the performance over conventional DVR is compared with the results obtained.展开更多
To improve the vehicle dynamic performance and ultra-capacitor operating circumstance,this paper studied the multi-current-two-quadrant converter applied to drive high power DC motor in ultra-capacitor electric bus(UC...To improve the vehicle dynamic performance and ultra-capacitor operating circumstance,this paper studied the multi-current-two-quadrant converter applied to drive high power DC motor in ultra-capacitor electric bus(UCEB).Compared with normal current-two-quadrant converter,the multi-current-two-quadrant converter can reduce the motor armature current ripple and the ultra-capacitor current ripple.Moreover,it improves power capabilities,reliability and fault tolerant capability of driving system.After analyzing the structure and working principle of the multi-current-two-quadrant converter,the expressions of armature current ripple and the quantitative relationships between the ultra-capacitor power loss and duty cycle were derived.The simulation and experimental results showed that the multi-current-two-quadrant converter has great advantages in reducing the armature current ripple and ultra-capacitor power loss,which can improve the vehicle performance and overall efficiency.展开更多
分析了以超级电容和ISG(integrated startergenerator)电机组成辅助动力源、电机驱动回转为特征的并联混合动力挖掘机系统;提出了发动机双模式转矩均衡控制策略,以负载工况与超级电容SOC(state of charge,荷电状态)为决策依据,实现发动...分析了以超级电容和ISG(integrated startergenerator)电机组成辅助动力源、电机驱动回转为特征的并联混合动力挖掘机系统;提出了发动机双模式转矩均衡控制策略,以负载工况与超级电容SOC(state of charge,荷电状态)为决策依据,实现发动机工作点的自适应调节.在特定工作点下,以转矩均衡控制策略替代传统的转速感应控制,系统转速更加稳定.ISG电机可以均衡发动机转矩,使其工作于高效率区.另外,利用回转驱动电机实现回转势能的再生利用.建立并联混合动力挖掘机系统的Simulink仿真模型.结果表明,该控制策略适用于挖掘机并联混合动力系统,具有显著的节能性.展开更多
研究一种基于多模块多电平双向DC-DC变换器的超级电容储能系统,该系统可有助于减小超级电容单体电压低与应用场合电压高间的矛盾。超级电容组间的均压控制是该系统稳定运行的关键之一。对超级电容组的均压控制和储能系统能量管理策略进...研究一种基于多模块多电平双向DC-DC变换器的超级电容储能系统,该系统可有助于减小超级电容单体电压低与应用场合电压高间的矛盾。超级电容组间的均压控制是该系统稳定运行的关键之一。对超级电容组的均压控制和储能系统能量管理策略进行分析和设计。利用双向变换器的小信号模型分析超级电容储能系统电流控制与超级电容组间均压控制的关系,设计多模块多电平双向DC-DC变换器的双闭环控制策略,在稳定控制网侧电感电流的同时实现超级电容组间电压均衡的解耦控制。进一步,根据母线电压变化及超级电容荷电水平(state of charge,SOC)提出储能系统能量控制策略。系统仿真和实验验证了所提出的基于MMC双向变换器的超级电容储能系统控制策略的有效性。展开更多
文摘In recent years, a rapid decrease in the cost of various energy storage technologies and their integration into grid becomes a reality with the advent of smart grid. The Dynamic Voltage Restorer (DVR) is a custom power device that has an excellent dynamic capability used to provide voltage sag, swell compensation in distribution systems. Among the energy storage devices, Ultra-Capacitors (UCAP) have ideal characteristics such as high power and low energy density essential for the compensation of voltage sag and swell, which require high power for short interval of time. This paper presents an integration of rechargeable UCAP with DVR. This UCAP-DVR presents a modular, flexible system configuration that will have an active power capability and also provide deep, extended mitigation for power quality problems. The DVR is integrated into UCAP via bidirectional DC-DC converter which supports a rigid dc-link voltage for DVR and also helps in compensating temporary voltage sag and swell. FUZZY LOGIC Controller is used to enhance the performance of UCAP-DVR. The simulation model for the proposed system has been developed in MAT-LAB and the performance over conventional DVR is compared with the results obtained.
基金Sponsored by the Heilongjiang 11th Five-year Key Project of Scientific and Technological(Grant No.GA06A305)
文摘To improve the vehicle dynamic performance and ultra-capacitor operating circumstance,this paper studied the multi-current-two-quadrant converter applied to drive high power DC motor in ultra-capacitor electric bus(UCEB).Compared with normal current-two-quadrant converter,the multi-current-two-quadrant converter can reduce the motor armature current ripple and the ultra-capacitor current ripple.Moreover,it improves power capabilities,reliability and fault tolerant capability of driving system.After analyzing the structure and working principle of the multi-current-two-quadrant converter,the expressions of armature current ripple and the quantitative relationships between the ultra-capacitor power loss and duty cycle were derived.The simulation and experimental results showed that the multi-current-two-quadrant converter has great advantages in reducing the armature current ripple and ultra-capacitor power loss,which can improve the vehicle performance and overall efficiency.
文摘分析了以超级电容和ISG(integrated startergenerator)电机组成辅助动力源、电机驱动回转为特征的并联混合动力挖掘机系统;提出了发动机双模式转矩均衡控制策略,以负载工况与超级电容SOC(state of charge,荷电状态)为决策依据,实现发动机工作点的自适应调节.在特定工作点下,以转矩均衡控制策略替代传统的转速感应控制,系统转速更加稳定.ISG电机可以均衡发动机转矩,使其工作于高效率区.另外,利用回转驱动电机实现回转势能的再生利用.建立并联混合动力挖掘机系统的Simulink仿真模型.结果表明,该控制策略适用于挖掘机并联混合动力系统,具有显著的节能性.
文摘研究一种基于多模块多电平双向DC-DC变换器的超级电容储能系统,该系统可有助于减小超级电容单体电压低与应用场合电压高间的矛盾。超级电容组间的均压控制是该系统稳定运行的关键之一。对超级电容组的均压控制和储能系统能量管理策略进行分析和设计。利用双向变换器的小信号模型分析超级电容储能系统电流控制与超级电容组间均压控制的关系,设计多模块多电平双向DC-DC变换器的双闭环控制策略,在稳定控制网侧电感电流的同时实现超级电容组间电压均衡的解耦控制。进一步,根据母线电压变化及超级电容荷电水平(state of charge,SOC)提出储能系统能量控制策略。系统仿真和实验验证了所提出的基于MMC双向变换器的超级电容储能系统控制策略的有效性。
