Design to conditioning circuits of dynamic compensation of reactive power in the intelligence voltage controller

The paper introduces one design idea that making use of SCM to control Real-timely the dynamic compensation of reactive power.Firstly,design one Circuit to Sample the voltage and current,and by these datas we can easily calculate the power factor,and Voltage controller in the microcontroller to determine whether input the compensation capacitance according to the size of power factor,the paper also analyzes the principle of capacitance compensation and calculation method. Dynamic compensation for the entire process is quick and accurate.

北京电力职工非酒精性脂肪肝的患病情况及危险因素分析

目的研究北京地区电力系统职工体检者非酒精性脂肪肝(non-alcoholic fatty liver disease,NAFLD)的患病情况,并分析其相关危险因素。方法选取2020年11月—2021年12月在国家电网公司北京电力医院体检的北京地区电力系统职工71462例为研究对象,采取问卷调查的方式体检者基本临床资料、一般体格检查与实验室检查资料,分析NAFLD患病危险因素。结果71462例体检人员中,NAFLD患者18581例,患病率为26.00%(18581/71462);性别、年龄、合并高尿酸血症、丙氨酸氨基转移酶(alanine aminotransferase,ALT)、血脂异常、糖尿病、高血压、超重/肥胖、腹型肥胖与NAFLD患病相关(P<0.05),具体职业与NAFLD患病无关(P>0.05)。与年龄<40岁者相比,年龄越大(OR=1.532,1.947),患NAFLD的可能性较大。男性(OR=2.345)、合并有高尿酸血症(hyperuricemia,HUA)(OR=1.867)、高ALT(OR=2.134)、血脂异常(OR=5.674)、糖尿病(OR=5.482)、高血压(OR=1.734)、超重/肥胖(OR=3.751)、腹型肥胖(OR=5.673)者患NAFLD的可能性较大。结论北京地区电力系统职工体检者NAFLD的患病率较高,男性、年龄增长、合并有HUA、高ALT、血脂异常、糖尿病、高血压、超重/肥胖、腹型肥胖是北京地区电力系统职工患NAFLD的主要危险因素。

分功率因数电能表挂网试运行分析

常州供电局将分功率因数电能表投入试运行,分别按"平均功率因数"和"功率因数分段"两种调整电费办法计算功率因数调整电费,并进行了对比分析。用分功率因数电能表能考核用户的实时功率因数,可以促进用户采用跟踪无功负荷变化的无功补偿装置。

城际铁路10kV配电所无功补偿方案探讨与应用

城际铁路10kV配电所进线和馈线均采用电缆线路,配电所内会出现容性无功功率。配电所的无功补偿设计只考虑了馈出贯通线的电容无功,没考虑进线电缆的电容无功,导致配电所所内显示功率因数达到补偿要求,但在电力部门计费端功率因数没达到补偿标准,需承担功率因数考核电费。针对城际铁路10kV配电所的特点,通过对湖北城际铁路10kV配电所无功补偿装置的监测分析,对其无功补偿方案进行研究,并优化补偿方案,以达到供电过程中满足功率因数的要求。

城际铁路牵引变电所无功功率补偿研究与应用

通过对已开通的城际铁路在运营初期客流量不足,列车开行对数过少的情况下,牵引变电所功率因数过低的现象进行调查、研究,通过对比分析和计算在所内安装了无功功率补偿装置,提高了牵引变电所的功率因数,节省了每月上缴的巨额功率因数考核电费,降低了运行成本,这对已经开通的暂时未形成运行网络的其他城际铁路功率因数偏低的牵引所有一定的借鉴意义。

功率因数自动补偿装置的研制

本文主要介绍用数字电路来完成功率因数自动补偿装置的工作原理，本装置解决了在10KV侧取样，0．4KV侧进行补偿问题．

Parameter Plane Synthesis and Performance Investigation of a Three-Phase Neutral-Point Clamped Bidirectional Rectifier

In this paper, parameter plane synthesis of a three-phase neutral-point clamped bidirectional rectifier has been performed. The converter involves one outer-loop PI voltage controller and two inner-loop PI current controllers for the closed-loop control. D-partition technique has been employed for the precise design of the voltage controller. The performance of the converter has been evaluated using MATLAB/Simulink software. An experimental prototype of converter has been developed and the experimental investigation of converter in closed-loop has been carried out. DSP DS 1104 of dSPACE has been used for real-time implementation of the designed controller. The performance of the converter has been found satisfactory using the designed controller parameters.

智能电网建设中的无功优化技术

为消除传统无功补偿设计方法所造成的布局不合理、利用率和效率低下等问题,电网无功优化与电压调节智能化无疑将是智能电网建设规划的重要组成部分.新的无功规划方案将涉及电网无功补偿布局、实时监测与调配、新型计量与考核.新的无功补偿优化体系将对相关产业产生巨大的影响.