This paper presents a comprehensive study that includes the sizing and power flow by series and parallel inverters in a distributed generation system(DGs)that integrates the system of hybrid wind photovoltaic with a u...This paper presents a comprehensive study that includes the sizing and power flow by series and parallel inverters in a distributed generation system(DGs)that integrates the system of hybrid wind photovoltaic with a unified power quality conditioner(UPQC).In addition to supplying active power to the utility grid,the system of hybrid wind photovoltaic functions as a UPQC,compensating reactive power and suppressing the harmonic load currents.Additionally,the load is supplied with harmonic-free,balanced and regulated output voltages.Since PVWind-UPQC is established on a dual compensation scheme,the series inverter works like a sinusoidal current source,while the parallel inverter works like a sinusoidal voltage source.Consequently,a smooth alteration from interconnected operating modes to island operating modes and vice versa can be achieved without load voltage transients.Since PV-Wind-UPQC inverters handle the energy generated through the hybrid wind photovoltaic system and the energy demanded through the load,the converters should be sized cautiously.A detailed study of the flow of power via the PV-Wind-UPQC is imperative to gain a complete understanding of the system operation and the proper design of the converters.Thus,curves that allow the sizing of the power converters according to the power flow via the converters are presented and discussed.Simulation results are presented to assess both steady state and dynamic performances of the grid connected hybrid system of PV-Wind-UPQC.This investigation is verified by simulating and analyzing the results with Matlab/Simulink.展开更多
由湍流、风剪切和塔影效应等引起的电压波动、闪变以及低电压穿越能力成为制约笼型风电机组并网发电的主要因素。对静止同步无功补偿器(static synchronous compensator,STATCOM)改善笼型机风电场性能的机理进行了深入分析,并通过电网...由湍流、风剪切和塔影效应等引起的电压波动、闪变以及低电压穿越能力成为制约笼型风电机组并网发电的主要因素。对静止同步无功补偿器(static synchronous compensator,STATCOM)改善笼型机风电场性能的机理进行了深入分析,并通过电网故障清除后发电机的转矩转差率曲线量化了STATCOM容量对风电场低电压穿越能力的影响。在实验室环境下搭建了包括STATCOM、笼型风电机组和电网的模拟装置的实验平台。STATCOM装置的硬件主要包括主电路、软起动电路和基于数字信号处理器(digital signal processor,DSP)控制系统的检测、驱动隔离等硬件电路;风力机模拟器选用PC机和Matlab实时软件作为控制平台,可以很容易地实现风力机特性及模拟风速变化等自然条件。实验结果验证了STATCOM能够减小公共连接点(point of common coupling,PCC)电压波动,改善笼型风电机组的电能质量。展开更多
文摘This paper presents a comprehensive study that includes the sizing and power flow by series and parallel inverters in a distributed generation system(DGs)that integrates the system of hybrid wind photovoltaic with a unified power quality conditioner(UPQC).In addition to supplying active power to the utility grid,the system of hybrid wind photovoltaic functions as a UPQC,compensating reactive power and suppressing the harmonic load currents.Additionally,the load is supplied with harmonic-free,balanced and regulated output voltages.Since PVWind-UPQC is established on a dual compensation scheme,the series inverter works like a sinusoidal current source,while the parallel inverter works like a sinusoidal voltage source.Consequently,a smooth alteration from interconnected operating modes to island operating modes and vice versa can be achieved without load voltage transients.Since PV-Wind-UPQC inverters handle the energy generated through the hybrid wind photovoltaic system and the energy demanded through the load,the converters should be sized cautiously.A detailed study of the flow of power via the PV-Wind-UPQC is imperative to gain a complete understanding of the system operation and the proper design of the converters.Thus,curves that allow the sizing of the power converters according to the power flow via the converters are presented and discussed.Simulation results are presented to assess both steady state and dynamic performances of the grid connected hybrid system of PV-Wind-UPQC.This investigation is verified by simulating and analyzing the results with Matlab/Simulink.
文摘由湍流、风剪切和塔影效应等引起的电压波动、闪变以及低电压穿越能力成为制约笼型风电机组并网发电的主要因素。对静止同步无功补偿器(static synchronous compensator,STATCOM)改善笼型机风电场性能的机理进行了深入分析,并通过电网故障清除后发电机的转矩转差率曲线量化了STATCOM容量对风电场低电压穿越能力的影响。在实验室环境下搭建了包括STATCOM、笼型风电机组和电网的模拟装置的实验平台。STATCOM装置的硬件主要包括主电路、软起动电路和基于数字信号处理器(digital signal processor,DSP)控制系统的检测、驱动隔离等硬件电路;风力机模拟器选用PC机和Matlab实时软件作为控制平台,可以很容易地实现风力机特性及模拟风速变化等自然条件。实验结果验证了STATCOM能够减小公共连接点(point of common coupling,PCC)电压波动,改善笼型风电机组的电能质量。