有功的
- 与 有功的 相关的网络例句 [注:此内容来源于网络,仅供参考]
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However, there are visible directions in research of this problem, which is either external analysis academically, thinking consumerism as neutral problem, such as sociology, or extensive praise, thinking consumerism as boundless beneficence to promoting economical increase, such as economics, or new exploration on advancing technical problem of consumption, so as to help the sustaining increase of consumerism, such as marketing, or as agent provocateur of consumerism, so as to research psychology of consumers, and to find out psychological weakness in human nature, such as consumption psychology.
但各个学科对这个问题的研究也明显存在着方向性的问题:它们或者从纯学术的意义上对消费问题进行客观的分析,对消费主义的盛行采取中性的态度;或者对消费主义的兴起兴高采烈,把消费主义看作是促进经济增长的有功之臣;或:耆对促进消费的技术性问题进行新的探索,以便助消费主义持续增长的一臂之力;或者充当消费主义的密探,对消费者的心理进行偷窥,为消费主义寻找人性的心理弱点,以便进行攻击。
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For the ill conditioned load flow caused by the error produced in the transformation from electricity quantities to average power, direct current load flow and sensitivity vector are presented to find out the ill node, then by adjusting the load curve and generation curve in a certain principle, which is shown in detail with several flow charts, a new operation mode is reestablished to ensure the convergence of the calculation. Optimal multiplier method is proposed to work out the least square solution according to ill conditioned structural power network. The electricity quantities flow method enhances the reliability and accuracy of the calculation of the power transmission losses.
该方法可根据当前输电网中各个变电站24小时的电量记录,利用电量潮流计算对输电网总线损和各条线路损耗进行计算,使计算的精度满足降损措施分析和指标考核的要求;并且对于由负荷出力曲线转化成平均功率计算潮流时引入的误差,进而导致潮流计算不收敛的情况,采用直流潮流法,依据相角对有功功率的灵敏度向量判断出"网络异常点",并且给出了解决此种情况的方法流程图;针对结构病态的电力系统潮流计算不收敛的情况,运用非线性约束优化方法中的最优乘子法求解潮流方程的最小二乘解,从而解决了电量潮流法计算理论线损时的收敛性问题,增强了该方法的适用性。
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In the developed prototype, the conduction cooling and the high temperature superconductive techniques are used.
这样的装置能根据电力系统的需要,利用所储存的电能,进行快速的动态有功和无功功率的调节,主动参与系统的稳定控制,是一种理想的提高电力系统动态性能和解决系统稳定性的手
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According to the definition and the distribution of VSR's voltage space vector, the introduction of a rule-based SVPWM current control strategy, with non-fixed switching frequency and dual hysteresis loops, that obviously improves the performance of current control. Based on two kinds of control strategies of VSR under unbalanced grid condition, the introduction of a new VSR control strategy featuring undamped-oscillation that simplifies the controller structure and effectively improves VSR's performance under unbalanced grid condition. A systematic description of the state switching in trilogic PWM signal generation of threephase CSR by using the conversion between bilogic and trilogic switching functions.
作者在如下工作的基础上对PWM整流器的一些关键问题提出了自己的研究思路、观点和方法:根据PWM整流器网侧矢量关系,直观地描述了其四象限运行的基本原理及特征;定量分析了VSR、CSR的PWM换相过程及波形特征;引入等效变压器模型并详细分析了VSR、CSR基于d—q模型的动、静态特性;提出了满足四象限有功、无功运行指标时的VSR交流侧电感设计方法;并提出了依据控制系统跟随性和抗扰性性能指标设计VSR、CSR直流侧储能元件的参数计算方法;在研究了VSR电流控制策略基础上,提出了影响VSR电流控制的几个要素,并进行了定量分析;根据VSR空间电压矢量的定义及分布,提出了基于规则控制的不定频滞环空间矢量PWM电流控制策略,并由此提出了具有双滞环特性的不定频滞环优化SVPWM电流控制策略,有效地改进了滞环PWM电流控制性能。
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From the aspect of electrical power system structure, the performance of signal sampling installment and the electromagnetic compatibility, discussed the primary factors which influence protective device reliability and the sensitive, proposed the problem of guaranteed its reliability and its sensitivity that should be adverted, had determined the active power selection selective leakage protection hardware architecture, the software computational method, and the method through the software proofread system angular error, have developed the intelligence protection system based on the AVR high speed MCU and the CAN bus.
从电力系统结构、信号采样装置性能和电磁兼容性的角度出发,论述了影响保护装置可靠性和灵敏性的主要因素,提出了保证其可靠性和灵敏性应注意的问题,确定了有功功率选线的选择性漏电保护的硬件结构、软件计算方法,和通过软件校正系统综合角误差的方法,研制了基于AVR高速单片机和CAN总线的智能保护系统。
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The principle of the novel single-phase hybrid active power filter is described in detail. Based on the above analysis, Kalman filtering approach for estimation of harmonics is presented to improve the speed and precision of harmonic detection, and it also can avoid the influence made by voltage distortion on harmonic detection. A new current control strategy based on energy balance is presented to regulate the active part absorbing or releasing active power and control the inverter to produce current opposite to the harmonic current reflowing in injection branch, the above method combined with harmonic current tracking control that keeps the stabilization of dc-side voltage and improve the reliability of the system.
并详细分析了系统的滤波原理,提出了基于卡尔曼增益自调整的改进型动态谐波含量估计方法,能够快速准确的跟踪检测电网谐波电流,并且克服了电力机车等冲击性负荷引起的电网电压畸变对谐波检测精度的影响;提出了基于逆变器两侧能量平衡的电流控制方法使有源部分吸收或释放一定有功或无功功率及产生与注入支路回灌谐波电流相反的抑制电流,然后联合电网谐波电流跟踪控制以获得系统参考信号,保证了直流侧电压的稳定,提高了装置可靠性,增强了系统滤波性能。
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The power factor is a power supply system of an importance technique economy index sign, use electricity equipments at consume useful power of in the meantime, return have a great deal of of useless the power be send by the power supply to burden, what power factor reflection is to use electricity equipments at consume certain of have a great achievement power of in the meantime demand of have no achievement power.
功率因数是供电系统的一项重要技术经济指标,用电设备在消耗有用功率的同时,还有大量的无用功率由电源送往负荷,功率因素反映的是用电设备在消耗一定的有功功率的同时所需要的无功功率。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.
这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力