Influence of CO2 inleakage on the slight-alkalization of generator internal cooling water

The slight-alkalization of generator internal cooling water (GICW) is widely used to inhibit the corrosion of hollow copper conductor and thereby ensure the safe operation of the generator. CO₂ inleakage is increasingly identified as a potential security risk for GICW system. In this paper, the influence of CO₂ inleakage on the slight-alkalization of GICW was theoretically discussed. Based on the equilibriums of the CO₂-NaOH-H₂O system, CO₂ inleakage saturation was derived to quantify the amount of the dissolved CO₂ in GICW. This parameter can be directly calculated with the measured conductivity and the [Na⁺] of GICW. The influence of CO₂ inleakage on the slight-alkalization conditioning of GICW and the measurement of its water quality parameters were then analyzed. The more severe the inleakage, the narrower the water quality operation ranges of GICW, resulting in the more difficult the slight-alkalization conditioning of GICW. The temperature calibrations of the conductivity and the pH value of GICW show non-linear correlations with the amount of CO₂ inleakage and the NaOH dosage. This study provides insights into the influence of CO₂ inleakage on the slight-alkalization of GICW, which can serve as the theoretical basis for the actual slight-alkalization when CO₂ inleakage occurs.     

DG planning with amalgamation of economic and reliability considerations

Distributed generation has been playing a vital role in dealing with issues related to distribution systems. This paper presents an approach which provides the distribution system operator with a set of solutions for DG placement to optimize reliability and total cost of power consumed by the distribution system. Optimal location of a Distributed Generator is evaluated based on the performance indices derived for reliability index and total cost of power consumed by the system. The proposed approach is applied to a 15-bus radial distribution system and a 18-bus radial distribution system and the results are analyzed.     

Dual-loop self-optimizing robust control of wind power generation with Doubly-Fed Induction Generator

This paper presents a self-optimizing robust control scheme that can maximize the power generation for a variable speed wind turbine with Doubly-Fed Induction Generator (DFIG) operated in Region 2. A dual-loop control structure is proposed to synergize the conversion from aerodynamic power to rotor power and the conversion from rotor power to the electrical power. The outer loop is an Extremum Seeking Control (ESC) based generator torque regulation via the electric power feedback. The ESC can search for the optimal generator torque constant to maximize the rotor power without wind measurement or accurate knowledge of power map. The inner loop is a vector-control based scheme that can both regulate the generator torque requested by the ESC and also maximize the conversion from the rotor power to grid power. An ℋ_∞ controller is synthesized for maximizing, with performance specifications defined based upon the spectrum of the rotor power obtained by the ESC. Also, the controller is designed to be robust against the variations of some generator parameters. The proposed control strategy is validated via simulation study based on the synergy of several software packages including the TurbSim and FAST developed by NREL, Simulink and SimPowerSystems.     

车载液压发电机组瞬态指标控制研究

介绍了车载液压发电机组典型液压控制回路及瞬态指标的影响因素,为了提高长管路动态响应频率低的液压发电机组瞬态指标,提出了具体的液压控制策略和电气控制策略,并给出了试验结果对比及分析。     

6kW柴油发电机组稳态与动态过程的仿真与分析

发电机组是由内燃机和发电机构成的发电系统。出于柴油发电机组系统仿真效率和精度的需要,提出了一种基于AMESim虚拟环境的软件仿真方案。根据6k W柴油发电机组的结构形式利用各应用库中的元件建立了机组的系统仿真模型;对机组进行不同转速下的稳定输出电压和额定负载下的气缸压力仿真,并与试验数据对比证明了模型的正确性;在此基础上,对机组进行了空载起动特性和带负载特性仿真,结果表明6柴油发电机组转速瞬态调整率较小,调节时间亦较短,能够显示良好的动态特性。     

DFIG-FMAC-PSS控制对风电并网系统的暂态稳定性改善

风电并网会对电力系统的稳定运行产生影响。为此本文考虑在双馈感应发电机(DFIG)上装设电力系统稳定器(PSS),提出DFIG转子磁链幅值和相角控制(FMAC)加PSS的控制方案。选用DFIG定子电功率作为PSS输入信号,通过调节DFIG转子磁链矢量的幅值和相角对发电机的端电压和输出功率进行控制,在大扰动的情况下对风电并网系统的稳定性进行研究。研究表明所提DFIG-FMAC-PSS的控制方案经济可行,在提供电压控制、促进阻尼作用和提高风电并网的暂态稳定性方面优于基于同步发电机的PSS解决方案。     

Optimal Sizing of a DBD Ozone Generator Using Response Surface Modeling

Dielectric barrier discharge (DBD) reactors used as ozone generators are well known today and widely used for water treatment and air disinfection. The purpose of this article is to propose an experimental procedure based on the response surface modeling in order to optimize the geometrical dimensions of the cylindrical shape ozone generator, i.e., the discharge gap and the electrodes length. Because an effective ozone generator is expected to give high ozone concentration with a minimum of power requirements, the applied high voltage was associated with the geometrical parameters to carry out a composite centered faces design. Obtained results indicate that for an efficient ozone generator, length of the electrodes needs to be optimized while the discharge gap should be minimized.     

Z6190Z_LD_K沼气发电机组的研制

本文介绍了由C6190ZL柴油机改制为单一燃料(沼气)发动机,并配置成发电机组的研制开发过程,论述了其结构特点、主要性能以及使用情况等。     

Z170静音箱式发电机组风冷散热器的设计与匹配

本文对Z170静音箱式燃气发电机组用风冷散热器设计匹配过程中，主要的影响因素、设计计算及注意的事项进行了分析，并结合试验验证所用的设计参数、储备系数的准确性。     

应急柴油机充气冷却水系统典型故障的处理

以福清核电应急柴油发电机组为研究对象,结合国内某运行核电厂应急柴油发电机组的相关检修经验,通过分析应急柴油发电机组充气冷却水系统压力波动过大、最低压力低于限值的典型故障事例,阐述了运行中出现故障的各种可能原因,介绍了排查方法。通过对典型故障处理过程的论述,为今后同类事件提供了借鉴和思路。