A simplified cascade current‐source inverter interconnected to a single‐phase three‐wire distribution system and its application to electric energy storage systems with batteries

A novel current source inverter system interconnected to the single‐phase grid is proposed. It has the same construction as the conventional three‐phase current source inverter that is interconnected to the single‐phase three‐wire distribution system. Though the proposed circuit has no output transformer, it can be equivalently performed as the single‐phase double cascade inverter by diverting the pole transformer in the utility system. By controlling the appropriate scheme, the output currents can be obtained as the five‐level waveforms and their distortions can be decreased sufficiently. It is applied to the interactive electric energy storage system with batteries and the basic discharging characteristics are discussed experimentally. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(2): 50–61, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10380     

Some notes on Zadeh’s extensions

This paper shows that the Zadeh’s extensions of sendograph-metric-continuous fuzzy-valued functions are sendograph-metric-continuous fuzzy functions.     

Quantum analysis of measurement results

It is shown that a stochastic matrix operator (quantum measurement matrix) may be considered in some cases as a density matrix. Results of measurements in the form of figure numbers, interconnected with a matrix of quantum measurements, are similar to quantum observable quantities determined in quantum statistical theory. __________ Translated from Izmeritel’naya Tekhnika, No. 12, pp. 3–8, December, 2006.     

活齿端面谐波齿轮啮合状态的几何模型

活齿端面谐波齿轮是综合现有的谐波齿轮传动和活齿传动的优点而发明的一种新型传动装置．可以在保留现有谐波齿轮传动所有优点的基础上．大幅度地提高所传递的功率。建立了描写活齿端面谐波齿轮啮合状态的几何模型．并利用该几何模型推导出了活齿端面谐波齿轮实现连续传动的条件。     

基于三点工况下的无源滤波器组优化设计

无源滤波器组的参数设计通常均针对系统单一工况(通常为最大工况)进行。当系统运行在其他工况时,有可能无论退出哪一组滤波器的运行均无法同时满足系统的无功补偿和谐波治理要求。为此基于系统的3种典型工况(最大、平均和最小工况)对无源滤波器组进行优化设计,确定合理参数,以在最小的投资费用下达到谐波治理与无功补偿的最优匹配。算例结果验证了该方法的可行性。     

一个在线考试系统的设计与实现

网上考试作为网络教学和校园信息化建设的较为重要的部分,有其独特的需求和作用。本文论述了采用生成随机数方法的一个在线考试系统的功能和数据库的设计与实现过程。     

电网谐波治理相关问题探讨

对谐波相关国家标准的可操作性、供电企业的责任、谐波用户管理及谐波治理方案的选择等问题进行了探讨,并提出了有关建议,对电网的谐波治理工作有一定的参考意义。     

零无功滤波器的设计与工程应用

针对目前部分末端用户负荷功率因数较高,而谐波严重的情况,研究设计了一种新的电路,使滤波器运行时输出无功较小,对于特定的谐波其阻抗接近于零,因此达到滤波的目的,并将该技术首次应用于温州文成钢厂的实际工程中,效果良好。     

电动汽车充电站谐波的抑制与消除

对电动汽车充电站产生的谐波特点进行了分析,介绍了充电站运行及检修对谐波的影响,并结合Q/CSG11516.2—2010《电动汽车充电站及充电桩设计规范》,提出防范与治理谐波的技术措施,包括合理增大充电机的滤波电感值、增大整流装置的脉波数、由容量较大的系统供电、加装滤波装置等。实测数据分析表明,在电动汽车充电站采用12脉波整流并配置滤波器的方案治理谐波是可行的。