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适用于风力发电设备的电力稳定装置
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作者 邓隐北 邢红超 《电源技术应用》 2011年第6期28-32,共5页
由于风力发电机的功率变动导致电力系统的频率波动。为确保系统的电能质量,本文阐述了功率变动缓和控制性电力稳定装置的组成结构与工作原理,并对风力发电功率平稳化效果进行验证的试验装置。予以介绍。
关键词 风力发电 功率变动 频率变动 电力稳定化装置 蓄电池 验证试验
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微波辐射消毒根管的效果研究 被引量:2
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作者 谢富强 《广东牙病防治》 2001年第2期85-86,共2页
目的 本实验采用固定微波频率、治疗时间 ,变动功率、治疗次数的方法 ,通过消毒前后根管内细菌培养结果 ,评价和筛选最佳消毒参数组合 ,为临床上使用微波消毒治疗牙髓病及根尖周病提供参考依据。方法 选择根管通畅的前牙和前磨牙共 6 ... 目的 本实验采用固定微波频率、治疗时间 ,变动功率、治疗次数的方法 ,通过消毒前后根管内细菌培养结果 ,评价和筛选最佳消毒参数组合 ,为临床上使用微波消毒治疗牙髓病及根尖周病提供参考依据。方法 选择根管通畅的前牙和前磨牙共 6 0颗作为研究对象 ,选择不同参数的微波辐射消毒根管。消毒前后作根管内细菌培养。结果 利用微波消毒根管的最佳参数组合是输出功率 30~ 40W ,每次照射时间 5秒 ,重复 2~ 3次。结论 微波作为物理性根管消毒方法之一 ,适用于根管通畅的患牙 。 展开更多
关键词 微波消毒 根管治疗 频波频率 治疗时间 变动功率
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Short Term Wind Power Prediction Using Wavelet Transform and ARIMA
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作者 In-Yong Seo Bok-Nam Hat +3 位作者 Sang-Ok Kin Won Nam-Koong Dong-Wan Seo Seong-JunKim 《Journal of Energy and Power Engineering》 2012年第11期1786-1790,共5页
A sustainable production of electricity is essential for low carbon green growth in South Korea. Although wind energy is unlimited in potential, both intermittency and volatility should be tackled for smart grid integ... A sustainable production of electricity is essential for low carbon green growth in South Korea. Although wind energy is unlimited in potential, both intermittency and volatility should be tackled for smart grid integration in future. To cope with this, many works have been done for wind speed and power forecasting. It is shown that statistical techniques are useful for short-term forecasting of wind power. This paper presents a statistical wind speed forecasting. The wavelet decomposition is employed as a de-noising technique. An illustration will be given by real-world dataset. According to the result, the MAD (mean absolute deviation) is improved as much as 10%. 展开更多
关键词 Wind speed forecasting autoreressive model wavelet decomnosition mean absolute deviation.
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High-Power-Factor Adjustable Speed Drive Using Diode Clamped Multilevel Inverter
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作者 Gunwant Ajabrao Dhomane Hiralal M Suryawanshi 《Journal of Energy and Power Engineering》 2013年第4期767-774,共8页
This paper presents a new approach to alleviate the harmonics and to enhance the power factor of the ASD (adjustable speed drive). A conventional ASD with 2-level PWM (pulse width modulation) inverters generate hi... This paper presents a new approach to alleviate the harmonics and to enhance the power factor of the ASD (adjustable speed drive). A conventional ASD with 2-level PWM (pulse width modulation) inverters generate high dv/dt and high frequency common mode voltages which are harmful for the drive applications. It reduces the motor bearings life and conducted EMI (electro magnetic interference) deteriorates the insulation. In this paper, a diode clamped multilevel (3-level) inverter is used to perform dual task. It generates HF (high frequency) current to be injected at the input of the three-phase front-end rectifier thereby improving the harmonic spectra and the power factor. It also drives the induction motor. The salient feature of this paper is that it does not require separate converters for improving power factor and to drive induction motor. Furthermore, inverter switches operate with ZVS (zero voltage switching), thus reducing the switching losses substantially, The voltage stress of the switches also has been reduced to half of the conventional 2-level converter. The inverter is operated with SPWM (sinusoidal pulse width modulation) technique. The simulation results for a prototype of 2.2 kW are presented. 展开更多
关键词 Adjustable speed drive high frequency current injection multilevel inverter zero voltage switching.
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适用于风力发电设备的电力稳定装置
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作者 邓隐北 邢红超(编译) 《磁性元件与电源》 2011年第11期142-145,共4页
由于风力发电机的功率变动导致电力系统的频率波动。为确保系统的电能质量,本文阐述了功率变动缓和控制性电力稳定装置的组成结构与工作原理,并对风力发电功率平稳化效果进行验证的试验装置予以介绍。
关键词 风力发电 功率变动 频率变动 电力稳定化装置 蓄电池 验证试验
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Fusion Energy and Stopping Power in a Degenerate DT Pellet Driven by a Laser-Accelerated Proton Beam
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作者 M.Mehrangiz A.Ghasemizad +1 位作者 S.Jafari B.Khanbabaei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第6期761-766,共6页
In this paper, we have improved the fast ignition scheme in order to have more authority needed for highenergy-gain. Due to the more penetrability and energy deposition of the particle beams in fusion targets, we empl... In this paper, we have improved the fast ignition scheme in order to have more authority needed for highenergy-gain. Due to the more penetrability and energy deposition of the particle beams in fusion targets, we employ a laser-to-ion converter foil as a scheme for generating energetic ion beams to ignite the fusion fuel. We find the favorable intensity and wavelength of incident laser by evaluating the laser-proton conversion gain. By calculating the source-target distance, proton beam power and energy are estimated. Our analysis is generalized to the plasma degeneracy effects which can increase the fusion gain several orders of magnitude by decreasing the ion-electron collisions in the plasma.It is found that the wavelength of 0.53 μm and the intensity of about 1020W/cm^2, by saving about 10% conversion coefficient, are the suitable measured values for converting a laser into protons. Besides, stopping power and fusion burn calculations have been done in degenerate and non-degenerate plasma mediums. The results indicate that in the presence of degeneracy, the rate of fusion enhances. 展开更多
关键词 proton fast ignition degenerate plasma laser-to-proton converter foil stopping power
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