自动化英文论文题目选题参考

论文题目应以最恰当、最简明的词语反映论文中最重要的特定内容的逻辑组合，关于自动化专业的论文题目有哪些?下面我给大家带来自动化专业的论文题目选题参考，希望能帮助到大家!

自动化 毕业 论文题目

1、配网自动化相关技术的研究

2、数字化变电站自动化技术的应用

3、现场总线与工厂底层自动化及信息集成技术

4、电力自动化技术的新发展

5、冶金自动化发展的策略与思考

6、简述电力系统及其自动化发展趋势研究

7、变电所综合自动化系统应用分析与探讨

8、浅谈数字变电站自动化系统

9、自动化专业人才培养方案和课程体系的改革与实践

10、配电网自动化技术问题初探

11、配电自动化系统中配电终端配置数量规划

12、基于组态软件的综合自动化平台的设计与实现

13、生产线自动化及远程监控

14、地铁自动化控制相关系统的对比及应用

15、配电自动化试点工程技术特点及应用成效分析

16、大型自动化控制系统故障报警技术应用研究

17、变电站综合自动化通信系统运行维护分析

18、浅谈变电站综合自动化系统的结构形式

19、如何提高综合自动化变电站的抗电磁干扰能力

20、动力部一降压变电站综合自动化系统改造及应用

21、智能变电站是变电站综合自动化的发展目标

22、中心城市大型配电自动化设计方案与应用

23、浅析电气自动化控制系统的设计思想

24、建筑电气自动化系统安装的施工技术探讨

25、水电厂电气自动化控制设备的可靠性探讨

26、铝工业电气自动化的现状与发展趋势

27、配网自动化建设对供电可靠性的影响研究

28、浅谈电力自动化管理系统

29、铁路变电站自动化监控系统的研制

30、浅析集控站综合自动化系统运行中存在的问题

31、基于IEC 61850的变电站自动化 系统安全 风险评估

32、新型智能配电自动化终端自描述功能的实现

33、天津城市核心区配电自动化技术实施与进展

34、配电自动化若干问题的探讨

35、矿井主扇风机自动化与信息化改造

36、馈线自动化自适应快速保护控制方案

37、自动化系统运行中出现的操作失误、服务失败及补救 措施

38、应用于拣选操作的自动化立体仓库作业优化调度

39、地质环境自动化远程监测项目社会评估--以山东省为例

40、矿井自动化项目技术管理模式浅论

41、自动化仓储系统优化 方法 的研究

42、电气自动化工程控制系统的现状及其发展趋势

43、自动化专业卓越工程师课程体系的改革与实践

44、国外配网自动化建设模式对我国配网建设的启示

45、煤矿自动化与信息化技术回顾与展望

46、基于调度策略的自动化仓库系统优化问题研究

47、配网自动化建设抵御呼伦贝尔寒冬

48、藁城新区水厂的自动化建设

49、综合自动化变电站电压量传输新方式

50、以先进自动化技术确保中线调水畅通

电气自动化专业毕业论文题目

1、 建筑电气工程自动化设计及实现分析

2、 电气自动化在电气工程中的应用

3、 建筑中的电气工程及自动化技术探讨

4、 成品金电气自动控制称量与熔铸的研发与应用

5、 电气自动化工程控制系统的现状及其发展趋势

6、 探究加强企业电气控制线路的合理设计

7、 电动挖掘机在高原环境下的电气特性及系统设计

8、 浅谈电气自动化控制系统的应用及发展

9、 电气自动化工程控制系统现状及其发展趋势探讨

10、 试论电气工程及其自动化的发展趋势

11、 高职电气自动化专业的现状分析及发展

12、 智能化技术在电气工程自动化控制中的应用

13、 智能化技术在电气工程自动化控制中的应用探究

14、 智能化技术在电气工程自动化控制中的应用

15、 智能化技术在电气工程自动化控制中的应用

16、 浅析煤矿生产中电气自动化技术的应用及发展

17、 电气自动化在煤矿生产中的应用

18、 单片机在煤矿电气自动化控制技术中的应用研究

19、 基于人工智能的电气自动化控制研究

20、 工业电气自动化中数字技术的应用与创新

21、 多功能舞台电气控制系统的研究与设计

22、 PLC技术在电气设备自动化控制中的应用

23、 电气自动化技术在铝电解过程中的应用研究

24、 电气自动化控制中的人工智能技术探讨

25、 PLC在选煤厂电气自动化系统中的应用与发展

26、 电气火灾监控系统原理及应用研究

27、 电气自动化控制中的PLC的有效应用

28、 PLC技术的原理、优点及其在电气设备自动化控制中的实践研究

29、 井下电气自动化控制系统优化分析

30、 矿井电气自动化系统优化分析研究

31、 智能化技术在电气工程自动化控制中的具体应用初探

32、 人工智能技术在电气自动化控制中的应用分析

33、 电气工程自动化中人工智能的运用

34、 面对人才需求的高校电气自动化专业创新能力培养模式研究

35、 电气工程及其自动化专业实践教学的探索与思考

电气工程及其自动化论文题目

1、智能化技术电气工程及其自动化的应用探析

2、探讨电气工程及其自动化发展问题分析及应对措施

3、电气工程及其自动化的智能化技术应用分析

4、电气工程及其自动化的质量控制与安全管理

5、PLC技术在电气工程及其自动化控制

6、电气工程的应用及其自动化分析

7、PLC技术在电气工程及其自动化控制中的运用

8、电气工程及其自动化的不足与改善对策分析

9、电气工程及其自动化的质量控制与安全管理

10、浅谈电气工程及其自动化在机械工程中的应用

11、PLC技术在电气工程及其自动化控制中的应用

12、电气工程及其自动化在农村配电网的应用探析

13、电气工程及其自动化技术下的电力系统自动化发展探讨

14、PLC技术在电气工程及其自动化控制中的运用

15、电气工程及其自动化低压电器中继电器的应用

16、电气工程及其自动化存在的问题及应对策略

17、电气工程及其自动化中智能化技术的应用分析

18、继电器在电气工程及其自动化低压电器中的应用研究

19、PLC技术在电气工程及其自动化控制中的应用

20、PLC技术在电气工程及其自动化控制中的应用分析

21、电气工程及其自动化中智能化技术的实际应用

22、电气工程及其自动化的智能化技术应用研究

23、电气工程及其自动化中 网络技术 的应用分析

24、刍议电气工程及其自动化的智能化技术应用

25、电气工程及其自动化的质量控制与安全管理

26、浅析继电器在电气工程及其自动化低压电器中的应用

27、关于电气工程及其自动化技术在发电厂的应用初探

28、电气工程及其自动化低压电器中继电器的应用

29、继电器在电气工程及其自动化低压电器中的应用研究

30、PLC技术在电气工程及其自动化控制系统中的运用

31、PLC技术在电气工程及其自动化控制中的应用

32、继电器在电气工程及其自动化低压电器中的应用分析

33、试论电气工程及其自动化的智能化技术应用

34、电气工程及其自动化专业实践教学的策略

35、电气工程及其自动化中智能化技术的应用

36、我国电气工程及其自动化的发展现状与前景

37、电气工程及其自动化技术在智能建筑中的应用

38、电气工程及其自动化的智能化技术应用

39、论如何提高电气工程及其自动化

40、电气工程及其自动化的质量控制与安全管理

41、智能建筑中电气工程及其自动化技术探讨

42、PLC技术在电气工程及其自动化控制

43、智能建筑中电气工程及其自动化技术的应用分析

44、PLC技术在电气工程及其自动化控制中的应用分析

45、电气工程及其自动化技术在供热建设中的难点分析

46、智能建筑中的电气工程及其自动化技术分析

47、电气工程及其自动化低压电器中继电器的应用探究

48、PLC技术在电气工程及其自动化控制中的运用分析

49、电气工程及其自动化控制中PLC技术的应用

50、智能建筑中电气工程及其自动化技术分析

自动化专业的论文题目选题相关 文章 ：

★ 自动化专业学术论文(2)

★ 机械类专业论文选题题目

★ 电气自动化专业毕业论文范文

★ 电气工程自动化大专毕业论文

★ 自动化专业概论论文范文怎么写

★ 机械制造与自动化专业参考论文(2)

★ 有关电气自动化毕业论文范文

★ 大专机械制造与自动化专业毕业论文(2)

★ 机械制造与自动化专业毕业论文

★ 大专机械制造与自动化专业毕业论文

自动化相关的论文题目

自动化是一门涉及学科较多、应用广泛的综合性科学技术。作为一个系统工程，它由5个单元组成。下面，我为大家分享自动化相关的论文题目，希望对大家有所帮助！

.自动化专业人才培养探索

.自动化流水线实训系统的设计

.电力自动化继电保护的安全管理

.浅析电气自动化控制系统的设计思想

.基于PLC的工业自动化控制技术探讨

.工业自动化控制技术向智能家居的演进

.矿井主扇风机自动化与信息化改造

.基于IEC的变电站自动化系统安全风险评估

.浅析集控站综合自动化系统运行中存在的问题

.数字化变电站自动化技术的应用

.如何提高综合自动化变电站的抗电磁干扰能力

.自动化专业人才培养方案和课程体系的改革与实践

.配电网自动化技术问题初探

.楼宇自动化系统的监控方式及节能分析

.地铁自动化控制相关系统的对比及应用

.基于调度策略的自动化仓库系统优化问题研究

.基于组态软件的综合自动化平台的设计与实现

.基于PLC和运动控制器的电气自动化实验平台的设计

.矿井自动化项目技术管理模式浅论

.铁路变电站自动化监控系统的研制

.馈线自动化自适应快速保护控制方案

.高速制管机上的自动化系统解决方案

.智能变电站是变电站综合自动化的发展目标

.煤矿自动化与信息化技术回顾与展望

.以先进自动化技术确保中线调水畅通

.绿色理念背景下电厂自动化控制系统研究

.大型自动化控制系统故障报警技术应用研究

.煤矿电气自动化控制系统优化设计

.配网自动化相关技术的研究

.中心城市大型配电自动化设计方案与应用

.自动化专业卓越工程师课程体系的改革与实践

.综合自动化变电站电压量传输新方式

.浅谈析电气自动化中的接地及保护

.办公自动化在飞行中的应用

.天津城市核心区配电自动化技术实施与进展

.配电自动化系统中配电终端配置数量规划

.倍福科技自动化技术助力高性能设备状态监测

.渠道自动化控制系统与运行设计探析

.自动化仓储系统优化方法的研究

.配网自动化建设与运行管理问题探微

.浅谈变电站综合自动化系统的`结构形式

.变电站综合自动化通信系统运行维护分析

.无功补偿技术在电气自动化中的应用

.基于PIE的高分遥感泥石流自动化变化检测方法研究

.电力自动化技术的新发展

.配电自动化试点工程技术特点及应用成效分析

.藁城新区水厂的自动化建设

.配电自动化若干问题的探讨

.工业自动化仪表故障分析及解决方法探析

.建筑电气自动化系统安装的施工技术探讨

.浅谈自动化仪表日常维护与故障解决

.浅谈电力自动化管理系统

.浅谈自动化控制系统及热工仪表的维护与管理

.电气自动化工程控制系统的现状及其发展趋势

.动力部一降压变电站综合自动化系统改造及应用

.新型智能配电自动化终端自描述功能的实现

.水电厂电气自动化控制设备的可靠性探讨

.国外配网自动化建设模式对我国配网建设的启示

.现场总线与工厂底层自动化及信息集成技术

.铝工业电气自动化的现状与发展趋势

毕业论文 (设计)文档规范格式毕业论文（设计）的整理、装订要求统一采用A4纸打印、左面竖装；毕业论文（设计）的书写格式规范1.毕业论文正文由毕业论文（设计）题目、作者、中文摘要、中文关键词、英文摘要、英文关键词、正文、参考文献9部分组成。(1) 论文题目：一般不超过25个字，要简练准确，可分两行书写；(2) 作者：处于论文题目正下方，须写明系、专业、年级、姓名； (3) 摘要：中文摘要字数应在200字以内，英文摘要实词数应在200个实词以内；(4) 关键词：中、英文均限制在3—5个词语内，各词间用“；”间隔；(5) 正文：论文正文包括引言(或者绪论、概述等)、论文主体、结语等，正文要标题清晰，图表和公式要编号，公式应另起一行书写。字数要求：正文字数要求4000－6000字(6)参考文献：参考文献是撰写论文时围绕论题参考的著作、论文、期刊、网上资料、图片音像资料等。参考文献总数不得少于8篇，鼓励结合学科特点查阅外文参考文献。参考文献在文中出现的地方用上标予以标明，序号用加方括号的阿拉伯数字表示（如[1][2][3]），列于正文文末。毕业论文（设计）的排版格式规范1.版面尺寸：A4(210×297毫米)。2.装订位置：装订线1cm，左面竖装，页边距上下左右均为。3.页码：采用页脚方式设定，采用小4号宋体、用第×页和随后的括号内注明共×页的格式，例如“第1页（共10页）”，处于页面下方、居中、距下边界的位置。4.正文文本：宋体小4号、标准字间距、行间距为固定值26磅、所有标点符号采用宋体全角要求排版。5.论文标题：小2号黑体，居中。6.中文摘要和中文关键词：抬头用5号黑体加粗，内容用5号宋体、两端对齐方式排列，行间距固定值26磅。7.英文摘要和英文关键词：抬头用5号Times New Roman体加粗，内容用5号Times New Roman体、两端对齐方式排列，行间距固定值26磅。8. 正文内标题：见附后格式。（分文理科版本）9.文中图表：所涉及到的全部图、表，不论计算机绘制还是手工绘制，都应规范化，符号、代号标准统一，字体大小与正文协调，手工绘制的要用绘图笔，图表名称和编号准确无误。10.参考文献：位于正文结尾后下空2行，行间距单倍行距，排版见附后格式。

不会写论文还这么嚣张?不就是250分吗得到了又怎么地？能吃呀？

用于分布式在线UPS中的并联逆变器的一种无线控制器A Wireless Controller for Parallel Inverters in Distributed Online UPS SystemsJosep M. Guerrero', Luis Garcia de Vicufia", Jose Matas'*, Jaume Miret", and Miguel Castilla". Departament #Enginyeria de Sistemes, Automatica i Informhtica Industrial. Universitat Polithica de CatalunyaC. Comte d'Urgell, -Barcelona. Spain. Email: .. Departament #Enginyeria Electrbnica. Universitat Polit6cnica de CatalunyaAV. Victor BaLguer s/n. 08800I - Vilanova i la Geltrh. SpainAbsiract - In this paper, a novel controller for parallelconnectedonline-UPS inverters without control wireinterconnections is presented. The wireless control technique isbased on the well-known droop method, which consists inintroducing P-oand Q-V schemes into the inverters, in order toshare properly the power drawn to the loads. The droop methodhas been widely used in applications of load sharing betweendifferent parallel-connected inverters. However, this methodhas several drawbacks that limited its application, such as atrade-off between output-voltage regulation and power sharingaccuracy, slow transient response, and frequency and phasedeviation. This last disadvantage makes impracticable themethod in online-UPS systems, since in this case every modulemust be in phase with the utility ac mains. To overcome theselimitations, we propose a novel control scheme, endowing to theparalleled-UPS system a proper transient response, strictlyfrequency and phase synchronization with the ac mains, andexcellent power sharing. Simulation and experimental resultsare reported confirming the validity of the proposed . INTRODUCTIONThe parallel operation of distributed Uninterruptible PowerSupplies (UPS) is presented as a suitable solution to supplycritical and sensitive loads, when high reliability and poweravailability are required. In the last years, many controlschemes for parallel-connected inverters has been raised,which are derived from parallel-schemes of dc-dc converters[I], such as the master-slave control [2], or the democraticcontrol [3]. In contrast, novel control schemes have beenappeared recently, such as the chain-structure control [4], orthe distributed control [ 5 ] . However, all these schemes needcontrol interconnections between modules and, hence, thereliability of the system is reduced since they can be a sourceof noise and failures. Moreover, these communication wireslimited the physical situation ofthe modules [6].In this sense, several control techniques has been proposedwithout control interconnections, such as the droop this method, the control loop achieves good power sharingmaking tight adjustments over the output voltage frequencyand amplitude of the inverter, with the objective tocompensate the active and reactive power unbalances [7].This concept is derived from the power system theory, inwhich the frequency of a generator drops when the powerdrawn to the utility line increases [8].0-7803-7906-3/03/$ 02003 IEEE. 1637However, this control approach has an inherent trade-offbetween voltage regulation and power sharing. In addition,this method exhibits slow dynamic-response, since it requireslow-pass filters to calculate the average value of the activeand reactive power. Hence, the stability and the dynamics ofthe whole system are hardly influenced by the characteristicsof these filters and by the value of the droop coefficients,which are bounded by the maximum allowed deviations ofthe output voltage amplitude and , when active power increases, the droopcharacteristic causes a frequency deviation from the nominalvalue and, consequently, it results in a variable phasedifference between the mains and the inverter output fact can be a problem when the bypass switch mustconnect the utility line directly to the critical bus in stead ofits phase difference. In [9], two possibilities are presented inorder to achieve phase synchronization for parallel lineinteractiveUPS systems. The first one is to locate a particularmodule near the bypass switch, which must to synchronizethe output voltage to the mains while supporting overloadcondition before switch on. The second possibility is to waitfor the instant when phase matching is produced to connectthe , the mentioned two folds cannot be applied to aparallel online-UPS system, since maximum transfer timeought to be less than a % of line period, and all the modulesmust be always synchronized with the mains when it ispresent. Hence, the modules should be prepared to transferdirectly the energy from the mains to the critical bus in caseof overload or failure [lo].In our previous works [11][12], we proposed differentcontrol schemes to overcome several limitations of theconventional droop method. However, these controllers bythemselves are inappropriate to apply to a parallel online-UPS system. In this paper, a novel wireless control scheme isproposed to parallel different online UPS modules with highperformance and restricted requirements. The controllerprovides: 1) proper transient response; 2) power sharingaccuracy; 3) stable frequency operation; and 4) good phasematching between the output-voltage and the utility , this new approach is especially suitable for paralleled-UPS systems with true redundancy, high reliability andpower availability. Simulation and experimental results arereported, confirming the validity of this control . 1. Equivalenl cimuif ofan invener connecled 10 a bust"Fig. 2. P-odraop . REVlEW OF THE CONVENTIONAL DROOP METHODFig. 1 shows the equivalent circuit of an inverter connectedto a common bus through coupled impedance. When thisimpedance is inductive, the active and reactive powers drawnto the load can be expressed asEVcosQ - V2 Q=where Xis the output reactance of an inverter; Q is the phaseangle between the output voltage of the inverter and thevoltage of the common bus; E and V are the amplitude of theoutput voltage of the inverter and the bus voltage, the above equations it can be derived that the activepower P is predominately dependent on the power angle Q,while the reactive power Q mostly depends on the outputvoltageamplitude. Consequently, most of wireless-control ofparalleled-inverters uses the conventional droop method,which introduces the following droops in the amplitude Eand the frequency U of the inverter output voltageu = w -mP (3)E = E ' - n Q , (4)being W* and E' the output voltage frequency and amplitudeat no load, respectively; m and n are the droop coefficientsfor the frequency and amplitude, , a coupled inductance is needed between theinverter output and the critical bus that fixes the outputimpedance, in order to ensure a proper power flow. However,it is bulky and increase:; the size and the cost of the UPSmodules. In addition, tho output voltage is highly distortedwhen supplying nonlinezr loads since the output impedanceis a pure is well known that if droop coefficients are increased,then good power sharing is achieved at the expense ofdegrading the voltage regulation (see Fig. 2).The inherent trade-off of this scheme restricts thementioned coefficients, which can be a serious limitation interms of transient response, power sharing accuracy, andsystem the other hand, lo carry out the droop functions,expressed by (3) and (4), it is necessary to calculate theaverage value over one line-cycle of the output active andreactive instantaneous power. This can be implemented bymeans of low pass filters with a smaller bandwidth than thatof the closed-loop inverter. Consequently, the powercalculation filters and droop coefficients determine, to a largeextent, the dynamics and the stability of the paralleledinvertersystem [ conclusion, the droop method has several intrinsicproblems to be applied a wireless paralleled-system ofonline UPS, which can he summed-up as follows:Static trade-off between the output-voltage regulation(frequency and amplitude) and the power-sharingaccuracy (active an4d reactive).2) Limited transient response. The system dynamicsdepends on the power-calculation filter characteristics,the droop coefficients, and the output of ac mains synchronization. The frequency andphase deviations, due to the frequency droop, makeimpracticable this method to a parallel-connectedonline UPS system, in which every UPS should becontinuously synchronized to the public ac )3)111. PROPOSED CONTROL FOR PARALLEL ONLINE UPSINVERTERSIn this work, we will try to overcome the above limitationsand to synthesize a novel control strategy withoutcommunication wires that could be appropriate to highperformanceparalleled industrial UPS. The objective is toconnect online UPS inverters in parallel without usingcontrol interconnections. This kind of systems, also namedinverter-preferred, should be continuously synchronized tothe utility line. When an overload or an inverter failureoccurs, a static bypass switch may connect the input line tothe load, bypassing the inve:rter [14][15].Fig. 3 shows the general diagram of a distributed onlineUPS system. This system consists of two buses: the utilitybus, which is connected lo the public ac mains; and thesecure bus, connected to the distributed critical loads. Theinterface between these buses is based on a number of onlineUPS modules connected in parallel, which providescontinuously power to the: loads [16]. The UPS modulesinclude a rectifier, a set of batteries, an inverter, and a staticbypass ac mainsutility busI I Ij distributed loads !Fig. 3. Online distributed UPS /I 4(4Fig. 4. Operation modes of an online UPS.(a) Normal operation. (b) Bypass operation. (c) Mains failureThe main operation modes of a distributed online UPS1) Normal operation: The power flows to the load, fromthe utility through the distributed UPS ) Mains failure: When the public ac mains fails, theUPS inverters supply the power to the loads, from thebatteries, without operation: When an overload situation occurs,the bypass switch must connect the critical busdirectly to the ac mains, in order to guarantee thecontinuous supply of the loads, avoiding the damageof the UPS this reason, the output-voltage waveform should besynchronized to the mains, when this last is are listed below (see Fig. 5):3)Nevertheless, as we state before, the conventional droopmethod can not satisfy the need for synchronization with theutility, due to the frequency variation of the inverters, whichprovokes a phase obtain the required performance, we present a transientP-w droop without frequency-deviation in steady-state,proposed previously by OUT in [ 111w=o -mP (5)where is the active power signal without the dccomponent,which is done by. -I t -1sP= p ,( s + t - ' ) ( s + o , )being zthe time constant of the transient droop transient droop function ensures a stable frequencyregulation under steady-state conditions, and 'at the sametime, achieves active power balance by adjusting thefrequency of the modules during a load transient. Besides, toadjust the phase of the modules we propose an additionalsynchronizing loop, yieldingo=w'-m%k,A$, (7)where A$ is the phase difference between the inverter and themains; and k, is the proportional constant of the frequencyadjust. The steady-state frequency reference w* can beobtained by measuring the utility line second term of the previous equality trends to zero insteady state, leading tow = w' - k4($ -@'), (8)being $and $* the phase angles of the output voltage inverterand the utility mains, into account that w = d $ / d t , we can obtain thenext differential equation, which is stable fork, positived$ *dt dt- + km$ = - + k,$' . (9)Thus, when phase difference increases, frequency willdecrease slightly and, hence, all :he UPS modules will besynchronized with the utility, while sharing the power drawnto the . CONTROLLIEMRP LEMENTATIONFig. 5 depicts the block diagram of the proposedcontroller. The average active power P , without the dccomponent, can be obtained by means of multiplying theoutput voltage by the output current, and filtering the product........................................................................................io",.LSj'nchronirorion loop.......................................................................................Fig. 5. Block diagram of the proposed a band-pass filter. In a similar way, the averagereactive power is obtained, hut in this case the output-voltagemust be delayed 90 degrees, and using a low-pass order to adjust the output voltage frequency, equation(7) is implemented, which corresponds to the frequencymains drooped by two transient-terms: the transient activepower signal term; and the phase difference term, whichis added in order to synchronize the output voltage with theac mains, in a phase-locked loop (PLL) fashion. The outputvoltageamplitude is regulated by using the conventionaldroop method (4).Finally, the physical coupled inductance can be avoided byusing a virtual inductor [17]. This concept consists inemulated an inductance behavior, by drooping the outputvoltage proportionally to the time derivative of the outputcurrent. However, when supplying nonlinear loads, the highordercurrent-harmonics can increase too much the outputvoltageTHD. This can be easily solved by using a high-passfilter instead of a pure-derivative term of the output current,which is useful to share linear and nonlinear loads [I 1][12].Furthermore, the proper design of this output inductance canreduce, to a large extent, the unbalance line-impedanceimpact over the power sharing . SIMULATION AND EXPERIMENTARELS ULTSThe proposed control scheme, (4) and (7), was simulatedwith the parameters listed in Table 1 and the scheme shownin Fig. 6, for a two paralleled inverters system. Thecoefficients m, n, T, and kv were chosen to ensure stability,proper transient response and good phase matching. Fig. 7shows the waveforms of the frequency, circulating currents,phase difference between the modules and the utility line,and the evolution of the active and reactive powers. Note theexcellent synchronization between the modules and theACmiiinr 4 j. ...L...... ..........................B...u...n...... ................................... iFig. 6. Parallel operation oftwa online UPS modules,mains, and, at the same time, the good power sharingobtained. This characteristik let us to apply the controller tothe online UPS paralleled I-kVA UPS modules were built and tested in order toshow the validity of the proposed approach. Each UPSinverter consisted of a single-phase IGBT full-bridge with aswitching frequency of 20 kHz and an LC output filter, withthe following parameters: 1. = 1 mH, C = 20 WF, Vi" = 400V,v, = 220 V, I50 Hz. The controllers of these inverters werebased on three loops: an inner current-loop, an outer PIcontroller that ensures voltage regulation, and the loadsharingcontroller, based on (4) and (7). The last controllerwas implemented by means of a TMS320LF2407A, fixedpoint40 MHz digital sigrial processor (DSP) from TexasInstruments (see Fig. 8), using the parameters listed in TableI. The DSP-controller also includes a PLL block in order tosynchronize the inverter with the common bus. When thisoccurs, the static bypass switch is tumed on, and the droopbasedcontrol is 7 Wa\cfc)rms for , ;mnectcd in parallel. rpchrontred io Ihc ac mdnl.(a) Frequencics ufhoth UPS (b) Clrculattng currcni among modulcs. (CJ Phmc d!Nercn;: betucen ihc UPS a#>dth e ai mum(d) Ikiril uf the phze diNmncc (e) md (0 Activc and rcactlw pouerr "I ooih UPSNote that the iimc-acs arc deliheratcly JiNercni due in thc disiinct timuion*uni) ofthe \ THE PARALLELESDYS Order I IFilter Cut-off Frequency I 0, I 10 I ragsFig. 8 shows the output-current transient response of theUPS inverters. First, the two UPS are operating in parallelwithout load. Notice that a small reactive current is circlingbetween the modules, due to the measurement , a nonlinear load, with a crest factor of 3, is connectedsuddenly. This result shows the good dynamics and loadsharingof the paralleled system when sharing a . 8. Output current for the two paralleled UPS, during the connection of Bcommon nonlinear load with a crest factor of 3. (Axis-x: 20 mddiv. Axis-y:5 Mdiv.).VI. CONCLUSIONSIn this paper, a novel load-sharing controller for parallelconnectedonline UPS systems, was proposed. The controlleris based on the droop method, which avoids the use ofcontrol interconnections. In a sharp contrast with theconventional droop method, the controller presented is ableto keep the output-voltage frequency and phase strictlysynchronized with the utility ac mains, while maintaininggood load sharing for linear and nonlinear loads. This fact letus to extend the droop method to paralleled online the other hand, the proposed controller emulates aspecial kind of impedance, avoiding the use of a physicalcoupled inductance. results reported here show theeffectiveness of the proposed approach.

Control of Parallel Inverters in Distributed AC Power Systems with Consideration of Line Impedance Effect在分布式交流电力系统中考虑连线阻抗影响时的并联逆变器控制 论文发到你的邮箱了