无功的

The paper introduces an improved harmonic and reactive current detecting method based on there-phase reactive current using instantaneous reactive power theory. By using matlab, simulation model is built, and the results show that this model can exactly detect harmonic and reactive current in time and it is feasible in DSP system.

本文在三相瞬时无功功率理论的基础提出了一种改进的单相无功电流检测算法，并建立了仿真模型，仿真结果表明：该算法可以及时、准确地检测出三相电路中的谐波电流和无功电流，同时也验证了此算法在DSP系统中的可行性。

A kind of automatic reactive compensation control circuit in network designed by making use of Hall power sensor has already found its application to practice thus realizing the on-line automatic detection and the optimal compensation of network reactive power.

一种利用霍尔功率传感器设计的电网无功功率自动补偿控制电路已在实际中得到良好的应用，实现了电网无功功率的在线自动检测，从而达到电网无功功率的最佳补偿。

It calculates the active power and reactive power of the net side of the rectification system on-line, which based on the three-phase circuit instantaneous reactive power theory. To provide fast and accurate real-time measurements of active and reactive for new type static var compensators, this paper designs a optimization digital low-pass filter with the approach by combining the Butterworth filters with mean filter.

基于改进的瞬时无功功率理论，在线计算整流系统网侧有功和无功功率，将Butterworth滤波器和均值滤波器相结合，优化设计高性能的数字低通滤波器，为新型SVC提供快速而准确的有功与无功在线测量值。

According to the reactive characteristics of the distributed generation and the shortcomings of the compensation system for static var compensator, based on the instantanous reactive theory and symmetrical component method, a real-time method for calculating the value of reactive power of the system is presented.

根据分布式发电的无功特点及现在SVC补偿系统的不足，利用瞬时无功理论和对称分量法，提出一种实时求取电力系统无功功率的方法。

The modified particle swarm optimization is utilized to solve the proposed reactive power optimization model; and combining with non–stationary multi-stage assignment penalty function, the reactive power optimization problem is transferred into a problem to solve extreme-value without constraints, thus the calculation accuracy and global convergence ability of MPSO are effectively improved, and power grid company can achieve maximal economic benefit by means of the proposed algorithm.

应用改进粒子群优化算法求解该无功优化模型，并结合动态调整罚函数法将无功优化问题转化成无约束求极值问题，从而有效地提高了改进粒子群优化算法的全局收敛能力和计算精度，使电网公司取得了最大经济效益。

E. providing with propersmall size low-voltmp power capacitor near the electric motor to lvalize the wattless power compensation of the motor.

简述了电动机无功就地补偿技术的原理和优点，给出了最佳补偿功率团数的确定、补偿电容器无功量的计算方法，以及无功补偿器保护设置和安装原则。

The method employs characteristic values such as hinge node voltage at dividing place between the large district grid and the provincial grid and tie line reactive power and so on as a coordinated variable of wattless control of the large district grid and the provincial grid, and real-timely calculates an optimal set value of the coordinated variable in the large district grid which is sent down to the provincial grid via wide area communication. In the coordinated control of the provincial grid, the method can not only realize the control object of original grid, but can also realtimely track the optimal set value of the coordinated variable given by the large district grid.

本方法选择大区电网与省级电网分界处枢纽节点电压和联络线无功等特征量作为大区电网与省级电网无功控制的协调变量，通过大区电网的无功优化，实时计算出大区电网中协调变量的最优设定值，该设定值通过广域通信下发到省级电网，在省级电网的协调控制中，除了满足本级电网的控制目标外，还实时跟踪由大区电网给出的协调变量的最优设定值。

The susceptance of the capacitor and the ration of the OLTC are regarded as control variables in the reactive power optimization to overcome the disadvantages in application of equal wastage ration method in distribution network.

传统的无功优化技术是以等网损微增率方法为基础的[1]，其主要优点是简单、有效，但对于配网来说，却存在两个主要缺陷：由于配网总的无功最优补偿容量无法确定，所以等网损微增率方法无法得到一个较优的补偿方案；在配网的实际运行中，当电压偏差较大时，有载调压变压器往往作为凋节电压的手段而对无功功率的分布产生影响，使得等网损微增率方法难以实现。

A multi-period reactive power optimization method based on two-layer genetic algorithm is presented,which recasts the complex reactive power optimization problem into a parallel processing problem of multi-period static reactive power optimization.

提出了一种基于两层遗传算法的多时段无功优化方法，将复杂的无功优化问题转化为多个时段静态无功优化的并行处理问题。

Since the voltage not only has relationship with both the reactive power and the balance of reactive load, but also relies on the structure of network and capability of voltage regulation, the system takes all the factors above into consideration and adopts the methods as follows: realizing grading control and management according to the voltage level and region partition, realizing jointly regulation and information pool by the application of advanced software in local and central station, realizing the optimal control of reactive voltage based on the measurement data from the regulative automation system and the angle of the whole system, realizing the exact application of reactive compensator and the on-load tap appropriate changer for voltage regulation transformers , and realizing the balance of reactive voltage in local site.

随着调度自动化系统的日益普及，以及越来越多的电网中的有载调压分接开关和电容器补偿装置投入使用，本课题研究开发基于分级递阶的地调/中心站模式无功电压控制系统，由于电压既与无功功率和无功负荷平衡有关，又与电网结构、调压能力有关，所以系统考虑电压等级、按区域实施分级控制、分级管理，利用中心站和地调的电力系统高级应用软件的作用实现众多装置的联合调整，信息共享。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。