Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric ...Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric grid interfacing custom power device （CPD） is controlled to perform the smart exchanging of electric power as per the Indian grid code. WE is connected to DC link of CPD for the grid integration purpose. The CPD based distributed static compensator, i.e. the distributed static synchronous compensator （DSTATCOM）, is utilized for injecting the wind power to the point of common coupling （PCC） and also acts against the reactive power demand. The novel indirect current control scheme of DSTATCOM regulates the power import and export between the WE and the electric grid system. It also acts as a compensator and performs both the key features simultaneously. Hence, the penetration of additional generated WE power to the grid is increased by 20% to 25%. The burden of reactive power compensation from grid is reduced by DSTATCOM. The modeling and simulation are done in MATLAB. The results are validated and verified.展开更多
It is significant to research the voltage stability of the wind power centralized system (WPCS) for the effective development of the large scale clustering wind energy resources. A steady state voltage stability analy...It is significant to research the voltage stability of the wind power centralized system (WPCS) for the effective development of the large scale clustering wind energy resources. A steady state voltage stability analysis of the WPCS by employing the PV curve and model analysis is proposed to reveal the voltage stability influence from different aspects. The PV curve is utilized to trace and indicate the voltage collapse point of the WPCS when the small disturbance of wind power is increased gradually. Then the steady state voltage instability modes of the WPCS are analyzed by calculating the bus participation factors of the minimum eigenvalue model at the collapse point. The simulation results of an actual WPCS in North China show that the static state voltage instability mode of the WPCS is closely related to the operating features and control strategies of different reactive power sources. In addition, the implementation of the doubly-fed induction generator wind turbine generator voltage control is beneficial to improve the WPCS voltage stability.展开更多
大规模风电并网导致宽频谐振问题日渐凸显,业内多认为电缆电容效应、控制器参数变化等是导致谐振的主要因素,而关于静止无功发生器(static var generator, SVG)、风功率变化与高频谐振内在因果关系研究尚未展开。针对低风速风场系统高...大规模风电并网导致宽频谐振问题日渐凸显,业内多认为电缆电容效应、控制器参数变化等是导致谐振的主要因素,而关于静止无功发生器(static var generator, SVG)、风功率变化与高频谐振内在因果关系研究尚未展开。针对低风速风场系统高频谐振问题,首先基于谐波线性化理论,考虑功率外环作用,建立SVG和双馈风机(doubly-fed induction generator, DFIG)的序阻抗模型。其次将风速变化纳入风机变流器建模,并建立空载电缆投入时风速变化与SVG阻抗的联系。然后利用阻抗交互揭示风机变流器阻抗变化对SVG阻抗特性的影响机理,指出区域内空载电缆投入后,低风速不仅降低系统在高频的鲁棒性,而且扩大了SVG高频负阻尼范围,导致系统高频谐振风险增加。最后,基于STARSIM-HIL搭建含SVG的双馈风场电磁仿真模型,并进行软硬件在环实验。实验结果证明了理论分析的正确性。展开更多
静止无功发生器(Static Var Generator,SVG)微弱谐波信号处于强干扰区域的中心频带时,会影响谐波信号检测有效性。为提升谐波信号检测性能,提出强干扰下的SVG微弱谐波信号传感检测方法。在强干扰下提取出SVG信号,并采用修正投影阻塞法消...静止无功发生器(Static Var Generator,SVG)微弱谐波信号处于强干扰区域的中心频带时,会影响谐波信号检测有效性。为提升谐波信号检测性能,提出强干扰下的SVG微弱谐波信号传感检测方法。在强干扰下提取出SVG信号,并采用修正投影阻塞法消除SVG信号中存在的干扰。选取振动传感器作为SVG微弱谐波信号检测仪器,由于振动传感器中的仪表放大器会对放大后的SVG信号叠加较多高频噪声,所以在强干扰抑制的基础上进一步滤除噪声。将振动传感器放置在振动台上,并检测处理后的SVG信号。通过数字示波器观测SVG微弱谐波信号在放大电路中的输出波形,判断信号在输送期间是否出现失真问题,从而实现SVG微弱谐波信号传感检测。实验结果表明,所提方法的信噪比高于23.51 dB,幅值检测误差低于0.63 Hz,频率检测误差低于7.1 Hz。展开更多
随着煤矿机电设备自动化程度的不断提升,输送机、破碎机、工矿电机车等大功率电动机和大型综采设备、变频器等大量非线性负载不断投入,引起较大的无功功率消耗,导致煤矿电网功率因数、供电质量与稳定性下降,给煤矿安全生产及经济效益带...随着煤矿机电设备自动化程度的不断提升,输送机、破碎机、工矿电机车等大功率电动机和大型综采设备、变频器等大量非线性负载不断投入,引起较大的无功功率消耗,导致煤矿电网功率因数、供电质量与稳定性下降,给煤矿安全生产及经济效益带来较大影响。静止无功发生器SVG(Static Var Generator)作为新一代高压动态无功补偿装置,响应速度快,配合滤波电容器FC(Filter Capacitor)兼具补偿无功、谐波和不平衡功能,对于提高煤矿电能质量具有良好的作用。对煤矿用SVG无功补偿装置系统参数进行了设计,并介绍了装置应用情况。展开更多
并联电容器装置在现代电力系统中用于补偿感性无功功率,提高功率因数,改善电能质量,降低线路损耗,提高系统或变压器的有功输出。目前,并联电容器装置得到了广泛应用,并取得了诸多成效。与传统的无功补偿方式相比,静止无功发生器(Static ...并联电容器装置在现代电力系统中用于补偿感性无功功率,提高功率因数,改善电能质量,降低线路损耗,提高系统或变压器的有功输出。目前,并联电容器装置得到了广泛应用,并取得了诸多成效。与传统的无功补偿方式相比,静止无功发生器(Static Var Generator,SVG)使用的电抗器和电容元件更小,会大大缩小装置的体积、占地面积及降低成本。SVG是未来无功补偿技术的重要发展方向。广西河池国投鱼峰水泥有限公司水泥磨低压配电室中部分电容器烧坏,通过检查电容器找到了故障原因,并在此基础上提出了整改措施。通过对电容器柜进行技术改造,提高了电力系统的功率因数,为电网安全运行提供了保障。展开更多
文摘Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric grid interfacing custom power device （CPD） is controlled to perform the smart exchanging of electric power as per the Indian grid code. WE is connected to DC link of CPD for the grid integration purpose. The CPD based distributed static compensator, i.e. the distributed static synchronous compensator （DSTATCOM）, is utilized for injecting the wind power to the point of common coupling （PCC） and also acts against the reactive power demand. The novel indirect current control scheme of DSTATCOM regulates the power import and export between the WE and the electric grid system. It also acts as a compensator and performs both the key features simultaneously. Hence, the penetration of additional generated WE power to the grid is increased by 20% to 25%. The burden of reactive power compensation from grid is reduced by DSTATCOM. The modeling and simulation are done in MATLAB. The results are validated and verified.
文摘It is significant to research the voltage stability of the wind power centralized system (WPCS) for the effective development of the large scale clustering wind energy resources. A steady state voltage stability analysis of the WPCS by employing the PV curve and model analysis is proposed to reveal the voltage stability influence from different aspects. The PV curve is utilized to trace and indicate the voltage collapse point of the WPCS when the small disturbance of wind power is increased gradually. Then the steady state voltage instability modes of the WPCS are analyzed by calculating the bus participation factors of the minimum eigenvalue model at the collapse point. The simulation results of an actual WPCS in North China show that the static state voltage instability mode of the WPCS is closely related to the operating features and control strategies of different reactive power sources. In addition, the implementation of the doubly-fed induction generator wind turbine generator voltage control is beneficial to improve the WPCS voltage stability.
文摘随着煤矿机电设备自动化程度的不断提升,输送机、破碎机、工矿电机车等大功率电动机和大型综采设备、变频器等大量非线性负载不断投入,引起较大的无功功率消耗,导致煤矿电网功率因数、供电质量与稳定性下降,给煤矿安全生产及经济效益带来较大影响。静止无功发生器SVG(Static Var Generator)作为新一代高压动态无功补偿装置,响应速度快,配合滤波电容器FC(Filter Capacitor)兼具补偿无功、谐波和不平衡功能,对于提高煤矿电能质量具有良好的作用。对煤矿用SVG无功补偿装置系统参数进行了设计,并介绍了装置应用情况。
文摘并联电容器装置在现代电力系统中用于补偿感性无功功率,提高功率因数,改善电能质量,降低线路损耗,提高系统或变压器的有功输出。目前,并联电容器装置得到了广泛应用,并取得了诸多成效。与传统的无功补偿方式相比,静止无功发生器(Static Var Generator,SVG)使用的电抗器和电容元件更小,会大大缩小装置的体积、占地面积及降低成本。SVG是未来无功补偿技术的重要发展方向。广西河池国投鱼峰水泥有限公司水泥磨低压配电室中部分电容器烧坏,通过检查电容器找到了故障原因,并在此基础上提出了整改措施。通过对电容器柜进行技术改造,提高了电力系统的功率因数,为电网安全运行提供了保障。
