Studies on some distribution test systems show the power flow analysis of distribution systems to have the superior performance in terms of solution time and convergence characteristics . the thesis proposes two algorithms for real - time switching control scheme of shunt capacitors 在配电网中布置有许多并联补偿电容器组，它们在网络经济运行中所起的作用不同和运行现场的技术条件不同，它们的实时运行控制采用不同的控制方式和控制算法。
Gzx inductive resistance current limiter is applied to ac power system with rated voltages of 6kv 10kv 35kv 50hz and series connected with shunt capacitor for limiting the surge current of shunt capacitor bank and eliminating the affection of capacitor discharging current during short circuit 电感电阻型限流器用于交流50hz ,标称电压为6kv 10kv 35kv电力系统中，与电容器相申联，以达到限制并联电容器组的合闸涌流，及消除电力系统短路时电容器放电电流的助增影响。
Meanwhile the thesis designs hardware structure of the reactive power compensator which use tms320f240 as the control core , and the software used in the system haved been debugged and complied based on the idea of modularized software design too . the digital signal processor with advantages of its higher speed and powerful calculation ability is applied to calculate the reactive power that need to be compen sated to follow the change of reactive power and add or cut capacitor banks to realize real - time and dynamic compensation periodically and automatically 设计了以dsp芯片tms320f240为控制核心的无功补偿控制器的硬件系统，基于模块化编程思想编制了软件，充分利用dsp的速度快、计算功能强大的特点，精确算出无功补偿分量，准确跟踪系统无功变化，对多级电容器组进行自动和循环投切，达到对系统动态实时补偿。
With the consideration of most of our transformers " taps are changed manually and some fluctuate unnecessarily , this paper presents a supervision system of oltc based on plc control technique . then we combine this system with reactive power compensate device such as shunt capacitor to design a new supervision system of substation voltage and reactive power synthetic control based on plc fieldbus 针对国内变电站电压调整大多依靠人工调节，且有载调压变压器( oltc )分接头动作频繁的特点，本文提出了基于plc控制技术的有载调压监控系统的研制方法，并以此监控系统为基础，结合并联补偿电容器组等无功补偿设备，设计了一种基于plc现场总线的变电站电压无功监控系统。
Firstly , the contributing factors leading to reignition and over - voltage are briefly discussed . then , with the aid the systematic simplified model and circuit equation , the thesis analyzes in detail the types and range of over - voltage of the capacitor banks under different circuit and switching conditions . the damage and the expected control level are identified 论文首先简要论述了重燃现象及过电压的成因;然后借助系统简化模型和电路方程,具体分析计算了不同电路和操作条件下投切电容器组过电压发生的类型和幅值,明确了危害的程度和需要控制的目标水平。
But in practical operating , overvoltage caused by reignition of the vacuum switching device frequently appears , and it result in damage of the capacitor bank or the switchgear itself . ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon 但在实际运行中,经常会出现因真空开关重燃而产生过电压,并导致电容器组或开关设备自身损坏的现象,而保证开关不重燃和安装保护装置是避免这类现象的两条主要途径。
Series reactor is applied to ac power system with rated voltage of 6kv - 63kv and series connected with shunt capacitor banks for restraining wave distortion in grid voltage so as to improving the quality of power system and ensure the safety of its operation . it can restrain harmonic current and surge current in capacitor banks so that the capacitor will operate reliably Ckdk型串联电抗器，适用于6 63 kv电力系统中，与并联电容器相串联，用以抑制电网电压波形畸变，从而改变电网质量和保证电力系统安全运行抑制流过电容器组的谐波电流和限制合闸涌流，从而保护电容器的安全可靠运行。
In order to get effective control parameter , the real time detecting method for the reactive current is specified by using the instantaneous reactive power theory of three - phase circuit . on the basis of lonworks technology , hardware and software structure of intelligent node is designed , a / d sampling and data traffic by applying network variables are researched in detail . finally , the network node is configured by employing the lon works exploiting tools , monitor - control of host computer for lonworks network and detecting method for network data are studied dependent on the lns dde server 本文基于已建立的系统总体结构，分析了无功功率补偿的关键技术、补偿执行单元的接线方式和补偿电容器组的分组方式；依据无功功率补偿原理，构建了补偿电容器组投切控制装置的结构，并确定了补偿电容器组的投切控制方式；为了获取有效的控制参数，确定了利用三相电路瞬时无功功率理论对无功电流进行实时检测的方法；以lonworks技术为基础，设计了智能节点的软、硬件结构，特别是对a d采样以及利用网络变量进行数据通信等方面做了详细研究；最后，利用lonworks开发工具对lonworks网络节点进行了配置，并通过lnsdde服务器，研究了上位机对lonworks网络的监控以及对系统网络数据的检测方法。
Firstly , the thesis briefly reviews the history of voltage and reactive power control technology , focusing on the defects of the equipment in use . then , with the theoretical analysis and the discussion on voltage and the characteristic of power system as well as the basic principle of voltage and reactive power control , the thesis makes a research on the character of voltage and reactive power control and interprets the controlling regularity of substation . in addition , with the consideration of the changes of transformer tips and the combined influence of capacity groups and reactive power and voltage , the thesis makes adjustment suggestion to the different operating - zones of voltage and reactive power 本文从降低网损和提高变电站自动化水平着眼，对变电站电压无功控制应用方面的问题进行了研究，本文首先简要回顾电压无功控制的发展概况，着重指出了现有电压无功控制装置的缺陷；通过理论分析，在讨论电力系统电压、无功调节特点以及电压无功总体控制原则的基础上讨论了变电站电压、无功控制特性以及控制原理，给出了变电站电压无功的控制规律；考虑了变压器分接头的变化及电容器组的投切对无功和电压的综合影响,针对电压、无功的各种运行控制区域给出了相应调节策略。
First the paper use the different four network operating condition as the primary given conditions and set the 330 / 220kv transformer tap changer position in the standard position , adding the paralleled capacitor bank sets one by one into the network to change the amount of the input reactive power , thus obtained four sets of the 330kv and 220kv bus voltage and the active and reactive power losses changing curves 进而研究了在每一确定并联补偿电容器组投入量条件下，随联变调压档位变化而产生出的一组并联补偿量、母线电压与损耗的变化曲线。进而选出了陇南电网在四种选定电网运行方式下、有功损耗最小条件下的最优综合控制组合曲线。
