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面向新型电力系统的频率安全研究综述与展望 被引量:16
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作者 韩泽雷 鞠平 +3 位作者 秦川 孙大雁 孙华东 郑义 《电力自动化设备》 EI CSCD 北大核心 2023年第9期112-124,共13页
随着电力系统低碳化转型的进程加速,我国电网正向着以“高比例新能源”和“高比例电力电子设备”为特征的新型电力系统转型。新能源出力的波动和电力电子设备的大规模接入,既显著增加了系统的不平衡功率冲击,又削弱了系统的频率支撑能力... 随着电力系统低碳化转型的进程加速,我国电网正向着以“高比例新能源”和“高比例电力电子设备”为特征的新型电力系统转型。新能源出力的波动和电力电子设备的大规模接入,既显著增加了系统的不平衡功率冲击,又削弱了系统的频率支撑能力,给频率安全带来了严峻挑战。从频率安全的建模、分析和控制3个角度出发,首先介绍了电力系统频率响应的4种模型:全系统详细模型、线性化模型、单机等值模型、人工智能模型。然后对电力系统频率安全指标及其量化评估方法、影响因素进行评述。最后从“源-荷-储”及其协调控制等方面分析了频率安全的控制手段并介绍了频率紧急协调控制系统,并对建模、分析和控制3个方面分别提出展望。 展开更多
关键词 新型电力系统 频率安全 频率响应建模 频率机理分析 频率安全控制
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Frequency/time domain modeling of a direct drive point absorber wave energy converter 被引量:2
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作者 CHENG ZhengShun YANG JianMin +1 位作者 HU ZhiQiang XIAO LongFei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第2期311-320,共10页
Two different methods to model a point absorber wave energy converter (WEC) with direct drive linear power take-off (PTO) are proposed in the present study: the frequency domain (FD) method and the time domain ... Two different methods to model a point absorber wave energy converter (WEC) with direct drive linear power take-off (PTO) are proposed in the present study: the frequency domain (FD) method and the time domain (TD) method. In the FD analysis, the frequency response function (FRF) of the WEC device is obtained via the equation of motion, and the expressions of power capture width in regular and random waves are derived as well. In the TD modeling, based on a state space approximation of the convolution term in the motion equation, both regular wave and random wave simulations are carded out. The regular wave simulation results indicate that the state space approximation is sufficiently accurate and the capture width reaches the maximum in the vicinity of the natural frequency. In the random wave simulations, the effects of buoy size, the PTO damping and wave climate on the power capture width are discussed in detail, which leads to the conclusion that the capture widths are influenced by the natural frequency of the WEC device, peak frequency of the wave spectrum, the amplitude of FRF and PTO damping. Furthermore, the increase of the capture width is at the cost of a relatively large buoy size and PTO damping when control is not included. 展开更多
关键词 wave energy converter frequency domain time domain power capture width power take-off damping
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