毕业设计（论文）电力负载的无功测控电路设计.doc

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1、长江大学毕业论文（设计）题目名称：电力负载的无功测控电路设计 题目类型： 毕业设计 学生姓名： 院（系）： 电子信息学院 专业班级： 指导教师： 时间： 2010年4月1日至2010年5月23日 目录毕业设计任务书.I文献综述II指导老师审查意见答辩会议记录评阅教师评语中外文摘要长江大学毕业设计(论文)任务书学院（系）电子信息学院 专业 仪器 班级 10601 学生姓名 指导教师/职称 1. 毕业设计(论文)题目：电力负载的无功测控电路设计2. 毕业设计（论文）起止时间：2010年03月01日2010年6月10日3毕业设计(论文)所需资料及原始数据（指导教师选定部分）1.基于MSP430系列单

2、片机的智能无功补偿控制器 2. 关于低压无功补偿装置的探讨 3. 配电系统无功补偿技术方案比较 4.电网功率因数的测量及无功自动补偿控制 4毕业设计(论文)应完成的主要内容了解实际电力负载的功率因数低的特性，分析由此造成的供电与用户的影响与损失。运用学过的知识，用电压，电流互感器进行发电机与电网的电压.电流.功率及相位的测量。运用单片机作比较计算并进行无功补偿（并联电容）。5毕业设计(论文)的目标及具体要求5.1.配电系统无功补偿的分析；5.2. 配电系统无功功率的实用检测电路设计；5.3.无功补偿的投切控制；5.4. 配电系统无功补偿的保护电路。6、完成毕业设计(论文)所需的条件及上机时数要

3、求计算机图书馆的各种图书及杂志网上数据库上机150学时任务书批准日期 2010 年 03 月 01日 教研室(系)主任(签字) 任务书下达日期 2010 年 03月 11日 指导教师(签字) 龙从玉 完成任务日期 2010 年6月 10日 学生（签名） Yangtze River University Wen Wen Xian graduates of comprehensive stateTitle Name: Reactive power load measurement and control circuit design Department: Electronic Informati

4、onProfessional-level classes: Instrument 10 601 Student Name: Wang Lin Hua Teach teachers: Long CongYu-teacher Completion Date :2010-5-3 Reactive power load measurement and control circuit design literature review Student: Wang Linhua, Electronic Information Instructor: Long CongYu , Telecommunicati

5、ons Institute Fist. Introduction I wrote this article is to introduce the current status of power system and power compensation in power system problems. Mainly related to the power system reactive power compensation in the area. Reactive power load measurement and control circuit design literature

6、review Low-voltage reactive power compensation reactive power load is an important part of compensation. Improve low-voltage compensation, not only can reduce the level of reactive power compensation on the pressure, but also improve the utilization of the user distribution transformers to improve p

7、ower factor and voltage quality of the user, and can effectively reduce power losses, thus reducing electricity bills . Reactive power compensation and power supply departments of user benefit. Existing reactive power compensation device type a lot, but basically by the detection unit, control unit,

8、 execution units, and power component. The task detection unit is detected from the network and network power factor directly or indirectly related to the parameters, and to give as gifts this parameter signals and control unit, the control unit to be compared with the control target value. Make swi

9、tching decisions. Implementation unit is based switching decisions by switching switch (AC Contactor) Control of capacitor switching, compensation to complete the task.Second, the main At present, the low voltage reactive power compensation devices are static and dynamic compensation device compensa

10、tion of two, the control method are: power factor control, reactive Power (or reactive current) control and other control methods. Static and dynamic reactive power compensation reactive power compensation. Static Var Compensator SVC means that when the reactive changes, control changes to control t

11、he capacitor according to the group switching to achieve the required reactive power compensation, the response normally greater than 5 seconds. Capacitor switching is accomplished by the contactor, due to capacitor inrush current withstand capability and the discharge time, capacitor grade, contact

12、ors operating frequency, life and other factors, so there is much to be desired: ( 1) there is a level of compensation, timing, and thus compensation accuracy, the time when the load changes frequently (such as rolling, high-power electric furnace, etc.), to follow is not strong. (2) The input capac

13、itor can be no surge. For contactor + reactor program, a larger increase in losses for capacitive touch device program, a high accident rate, but also a great influence on the life of the capacitor. (3) run noisy. (4) As part of the load control contactor coil is in the switching process, will produ

14、ce sparks and high harmonics, resulting in interference, affect the compensation device reliability and service life. Static reactive power compensation equipment and some use of composite switch as the Closing and breaking circuit current component, which uses silicon and contacts (or high-capacity

15、 relays) in parallel, when you need input capacitor, the first by the SCR conduction circuit, no inrush current into the capacitor, and then contacts (or high-capacity relays) conduction circuit, controllable Silicon out of operation. Removal of the action when the capacitor is the opposite order. B

16、ecause of the inherent characteristics of the components used, limitations, when the controller detects reactive change needs switching capacity of the capacitor must, we must delay a certain time (response time greater than 5 s) for switching. Therefore, static reactive power compensation is a long

17、er delay switching for reactive compensation. In addition, the operation was found, due to high current flows through the relay contacts regularly, and frequent switching, make contact burning, bonding occurs. Relay contacts will occur shake off timely, high harmonic generation, on the controller to

18、 work greater impact. Dynamic reactive power compensation (Thyristor Switched Capacitor TSC): As the SVC is kind of long-latency switching method, which is determined by its reactive change frequently and vary greatly in the case, can not meet the requirements. In modern power electronic devices and

19、 digital control technology support, with fast switching capability of dynamic reactive power compensation device can quickly. Tracking compensation of reactive power changes. Static and dynamic compensation equipment circuit structure is the same, but the dynamic compensation is dynamic compensatio

20、n controller to control the fast-pass thyristor .Broken, no surge in power capacitor switching. Reactive power regulator replaced electromagnetic AC contactors to change this component, making the performance of the compensation device has been a qualitative leap to a capacitor bank switching time r

21、educed by a few hundred milliseconds to 20,30 ms . That is, l 2 个 a cycle is complete a capacitor bank switching, so do the amount of reactive power compensation can quickly follow changes in actual demand. As the reactive power regulator is a non-contact capacitive switch long life, so that no surg

22、e capacitors impact the process of investment, no operating over-voltage, arc-free capacitor renewed removal process, the whole long life, maintenance of small and can be removed in the capacitor after the discharge to any What input voltage again. Frequent switching capacitor can be divided into ph

23、ase compensation. Power factor control and reactive power (reactive current) control whether static VAR compensation, or the dynamic reactive power compensation, require a controller to complete the network parameters of the measurement, control capacitor banks switching. Most of static reactive pow

24、er compensation device is a contactor switch element, the controller issued a traffic signal switches to control contactors or off Closing Open. Dynamic reactive power compensation device to thyristors as switching elements, the controller issued a trigger signal to the thyristor. Reactive power com

25、pensation device has power factor control and reactive power (no Reactive current) control in two ways, each of the following features: Power factor control power factor control is to meet the requirements for power factor control objectives, so that the grid power factor to meet the requirements. P

26、ower Factor Controller on the grid voltage and current sample testing, analysis and calculation of power by the current value, with the current power factor values with the switching threshold set for comparison to determine whether investment, removal of capacitors, or maintaining the status quo unchanged. Suppose the power factor before compensation 0.9. When the input threshold is set to = 0.9, the controller detects the current power factor is less than 0.9, to issue instructions, input of a compensation capacitor. If the compensated power factor 0(负载呈感性)