基于组合型算法的风电并网地区电压闪变参数识别

针对矩形波调制下的闪变信号模型,提出优化能量算子以改善闪变包络提取精准度。将最大旁瓣衰减速率（MSLD）截断窗作为原始母窗,通过卷积运算构造频谱性能突出的MSLD自卷积窗（MSLD-SCW）函数。基于谱线插值原理推导出2阶 SCW函数的参数修正公式,据此实现闪变幅值与频率参数的处理与识别。与对照组算法的仿真结果表明,研究组在单频调制、多频调制、含有整数次谐波与次/超同步分量、基频波动及含高斯噪声等工况下,均保持较高的两大闪变包络参数识别准确性。最后,将组合优化算法应用于新疆某地区实际电网闪变参数识别,验证其工程实用性。     

特高压直流输电系统阀组投退策略

为研究特高压直流输电系统阀组投退策的策略,以云南—广东±800kV特高压直流输电工程为参照对象,借助实时数字仿真器(realtime digita lsimulator,RTDS),分析了整流侧和逆变侧阀组投退顺序,以及旁路开关、触发脉冲、旁通对等控制信号之间的时序配合,研究了特高压直流工程中第2个阀组投入和第1个阀组退出的控制策略。研究结果表明:第2个阀组投入时,触发角限制值为70°,限制时间为10ms,整流侧先解锁逆变侧后解锁,且整流侧需投入电压电流平衡功能;第1个阀组退出时,应整流侧先投入旁通对逆变侧后投入旁通对。第1个阀组退出过程会出现整流侧直流电流短暂断流和逆变侧直流电流剧增现象,后系统自动恢复正常。     

微网系统中电池储能系统应用技术研究

随着可再生能源发电技术的发展,能够整合分布式发电系统的微网成为满足日益增长的电力需求、节省投资和提高能源利用率的一种有效途径。储能系统作为微网必要的能量缓冲环节,其作用越来越重要。文章概述了电池储能系统的基本特性,分析了电池储能系统的运行及控制原理,并详细阐述了其在微网中的作用。基于蓄电池的储能系统,不仅能起到能量缓冲的作用,还能提供短时供电、缓冲微网中负荷波动、改善微网电能质量,对提高微网的经济效益具有重要作用。     

Backflashover simulation of HV transmission lines with concentrated tower grounding

For high voltage (HV) transmission lines (TLs) the backflashover phenomenon can occur when lightning strikes a tower or a shield wire (SW). In this paper, the backflashover phenomenon of typical HV-TLs has been studied. The simulation code, based on ATP/EMTP program, accounts for both the discharge process between the arcing horns of insulator strings, by means of a leader progression model and the non-linear transient behaviour of tower grounding systems consisting of vertical rod(s). The lightning current ranges, causing back flash in a 161 kV-50 Hz single circuit line with two grounded SWs, have been investigated in detail. Numerical results of the investigations are in good agreement with actual behavior of the studied TL.     

脉宽调制型逆变器优化数字控制技术研究

对脉宽调制型（pulse width modulation,PWM）逆变器在离散域下直接建立准确的逆变器离散化模型建模,得到准确的离散域数学对象模型后,再在离散域下直接进行控制器设计,从而得出最好的对象模型与优化的数字控制方案。在比例–积分（proportional-integral,PI）控制参数设计时,通过朱利判据得到 PI 参数的取值范围,并且根据内环截止频率比外环高的要求设计出最后的控制器参数。最后在1台逆变器台架上进行了试验,验证了理论与仿真以及控制参数设计的正确性。     

Cation and oxyanion doping of layered perovskite BaNd2In2O7: Oxygen-ion and proton transport

Proton-conducting electrochemical devices such as protonic ceramic fuel cells and protonic ceramic electrolysis cells play a major role in the creation of eco-friendly “green” energy systems. The most studies of proton-conducting materials for these devices are barium cerate zirconates. The layered perovskites are novel class of proton-conducting materials. In this paper, the possibility of cation and oxyanion doping of layered perovskite BaNd₂In₂O₇ was carried out for the first time. The most conductive composition BaLa_1.9Sr_0.1In₂O_6.95 demonstrates protonic conductivity value 2·10⁻⁵ S/cm at 450 °C. The acceptor-doped two-layer perovskites are the prospective class of proton-conducting materials, and further modification of their composition opens up a new way in the design of solid oxide protonic conductors.     

自动转换开关合闸涌流对异步电动机负载的影响

针对电动机失电存在残余电压和异步电动机双电源开关转换时可能会产生较大的合闸涌流和过电压问题,通过Matlab仿真软件研究电动机负载电源转换的暂态特性,寻找备用电源合适的合闸时刻。对智能化自动转换开关（ATSE）控制器的设定具有一定的指导作用。     

±500kV双回进线的高压直流换流站雷电侵入波防护(英文)

In order to obtain reasonable schemes of arrester in converter stations, the arrester scheme of "Xiluodu-Guangdong HVDC ± 500 kV double circuit transmission" project against lighting induced overvoltage, which was designed according to the main principle of lightning protection in converter station, is discussed. A calculation of the lighting induced overvoltage in Zhaotong converter station un- der various operation modes is performed with ATP-EMTP software, then the surge arrester configuration of the converter station is decided, and the arrester protection schemes of smoothing reactor and neutral line are studied. It is concluded that additional protection is necessary because of the relatively large gap between protected disconnecting switch and arrester of metallic return transfer bus. Plus, the smoothing reactor (SR) arrester near the valve hall could be removed to improve the scheme’s economic performance.     

微燃机冷热电联产系统的经济优化

微型燃气轮机(简称微燃机)冷热电联产系统(combined cooling,heating and power,CCHP)具有极高的能源利用效率,其经济效益明显。首先建立了基于微燃机的冷热电联产系统的仿真模型及经济优化模型,分别分析了冷热电负荷比例、燃料价格、剩余电力上网政策、购电电价等对系统经济性的影响。在分析电价的影响时,分别按固定电价和实时电价进行了分析。算例分析表明微燃机CCHP系统的运行成本不仅跟冷热电负荷的需求有关,还与电网电价、微燃机燃料价格和锅炉燃料的价格有关。