SVC高压动态无功补偿装置

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N o prior notice about product m odifications w ill be indicated due to continuous product updates. 哈尔滨九洲电气股份有限公司 HARBIN JIUZHOU ELECTRIC CO.,LTD. 地址:哈尔滨市南岗区哈平路162号 Address:162 HaPing Road NanGang District, Harbin. 总机(Tel ):86-0451-86698888 86679300 24小时服务(Sales Hot Line):4006-050600 传真(Fax):86-451-86696792 E-mail:market@jze.com.cn PowerSolverTM高压动态无功补偿装置(SVC) PowerSolverTM Static Var Compensator http://www.jze.com.cn 2 3 CONTENTS 现在电网所面临的威胁 Now Power Grid Facing threat SVC在电网中可发挥的作用 The Functions of SVC in Power Grid SVC SVC在用户侧可发挥的作用 The Functions of SVC for Users SVC TCR型SVC补偿原理 TCR Working Theory SVC SVC应用领域 Applications SVC SVC系统组成 System SVC 6 7 7 9 10 13 产品介绍 Product introduction TCR型SVC TCR type SVC 高压电力滤波器(FC) High voltage power filter(FC) TSC型SVC TSC type SVC 传统无功补偿HVC(MSC) Traditional reactive compensation HVC (MSC) 14 15 18 20 23 C O N T E N T S 哈尔滨九洲电气股份有限公司(简称九洲电气）是中国电力电子行业龙头企 业之一，是以“高效节能、新型能源、电网治理”为产品发展方向。通过 向客户提供电力电子成套设备来实现客户的电网和电气装置的高效节能和 最终运行。 九洲电气静止型高压动态无功补偿装置（SVC）是与清华大学联合，综合应 用现代电力电子技术、电能控制技术以及自动化技术而研制开发的高科技 产品。SVC是一种能够为电力系统快速而连续地补偿系统无功功率的电力 电子装置，采用成熟、可靠、先进、实用的晶闸管控制电抗器（TCR）和固 定电容器组（FC），即TCR+FC的典型结构，能准确迅速地跟踪电网或负 荷的波动，对变化的无功功率进行动态补偿，响应时间小于10ms，实现功 率因数补偿至0.92以上。九洲电气静止型动态高压无功补偿器（SVC）具有 灵活的控制方式，能进行连续、分相和近似线性的无功功率调节，同时， 将固定电容器组FC做成多回路滤波器，能够滤除由晶闸管控制电抗器TCR 和负荷电网中的谐波。 它采用诸多关键技术，如高压晶闸管阀组的压制、均压、监控、保护、触 发、冷却技术、系统瞬态电压、电流、无功检测技术、系统无功功率动态 实时控制技术等。晶闸管阀组工艺先进，结构紧凑、运行可靠、维护工作 量少。核心控制器采用高速数字信号处理器DSP，其结构简单，信号采集 高速、实时、准确，信号处理快，硬件和软件都便于扩展和修改，控制精 度高、功能强大、工作可靠性高，抗干扰能力强。PLC自动监控系统完成各 种继电保护功能，并通过触摸屏的直观界面实现人机友好交流。已经被广 泛地应用于电气化铁路、电力工业、冶金工业、城市建设等行业中，可以 给用户带来巨大的经济效益和社会效益。 Harbin Jiuzhou Electric Company Limited (hereinafter referred to JZE) has gained the top position in the field of the China Electric Power. JZE is based on "high energy-efficient, new energy, power grid management" for product development. Through providing the electronical power products to customers to run the customer's power grid and electric equipment high energy-efficient . JZE PowerSolver TM Static Var Compensator (SVC) is a new high-tech product developed based one modern power electronics, power control technology and automation technology. It is an advanced power electronics equipment with the cooperation of Tsinghua University. JZE PowerSolverTM SVC provides fast and continuous capacitive and inductive reactive power supply to the power system. With the mature, reliable, and typical structure of thyristor controlled reactor (TCR) and fixed capacitor(FC), JZE SVE can follow the dynamic variation of the power system or loads rapidly to compensate the variable reactive power dynamically. The control response time is less than 10ms. The power factor can be greater than 0.92. Continuous, single phase and almost linear regulation can be realized. Meanwhile, the fixed capacitor banks are designed as filters to reduce harmonics injected into the power system by TCR operation. It applies many key techniques, like monitoring, protection, touch start, cooling, system instant voltage and current, compensation inspection technology, system compensation power static real time control technology. Thyristor technique is advance, structure is tight, performance is reliable, and maintenance is short and easy. The core controller uses high speed digital signal processor DSP, the structure is simple, the signal collection speed is high, real time, accurate, it is easy to expand and repair both hardware and software, and the control accuracy is high, function is strong, reliable and highly anti-jamming. PLC auto control system can complete various relay protection, and through touching pad’s direct interface to realize friendly human-machine interface communication. It has been widely used in electrical railway, electrical power industry, metallurgy, and urban construction etc., brings great benefit to customers and the society. 4 5 I N T R O D U C T I O N 　现在电网所面临的威胁 电网供电质量主要由供电电压偏差、电压波动及闪变、电网谐波含量、三相电 压不平衡度、系统频率等电网供电质量深受影响。其中各种电力电子开关器件 的大量应用和负载的频繁波动是两大干扰源，可导致以下影响： ~ 功率因数低，增加电网损耗，加大电能生产成本，降低生产效率。 ~ 无功冲击引起电网电压降低、波动及闪变，严重时导致传动装置及保护装 置无法正常工作甚至停产。 ~ 产生高次谐波电流，导致电网电压畸变。 ~ 导致保护及安全自动装置误动作。 ~ 电容器组谐波电流放大，使电容器过负荷或过电压，甚至烧毁。 ~ 增加变压器损耗，引起变压器发热。 ~ 导致电力设备发热，电机力矩不稳甚至损坏。 ~ 加速电力设备绝缘老化，绝缘易击穿。 ~ 干扰通讯信号。 ~ 导致电网三相不平衡，产生负序电流使电机转子发生振动。 　Now Power Grid Facing threat The power support quality is mainly judged by supply voltage variation, voltage wave and flickering, grid harmonic, 3 phases voltage unbalance, system frequency variation and other parameters etc.. As the more and more non-linear electrical equipments are used in the grid, the grid’s power support quality is affected seriously. Various electrical and electronic switch units and the frequent wave of load are two main factors which cause below drawbacks: ~ Low power factors, increase grid exhaustion, increase power generation cost, decrease production efficiency. ~ Grid voltage decrease, wave and flicker, causes faults on drive device and protection device, even production ceased. ~ High order harmonic current, causes grid voltage distortion. ~ Protection and safe auto device error operation. ~ Capacitors harmonic charging current increases, cause fusers overloaded or overvoltage, even burned. ~ Increase transformers wear down, cause transformers heating up. ~ Cause equipment heating up, motor torque unstablized and even broken. ~ Increase equipment’s aging, easy to make insulation broken. ~ Disturb telecommunication signal. ~ Cause grid three phases unbalanced, generate negative order current to make rotors trembling. 　SVC在电网中可发挥的作用 ~ 调节系统电压 ~ 保持电压稳定 ~ 控制无功潮流 ~ 增加输送能力 ~ 为AC-DC换流器提供无功功率 ~ 提高系统的静态和暂态稳定性 ~ 加强对低频振荡的阻尼 　The Functions of SVC in Power Grid SVC ~ Adjust system voltage. ~ Keep voltage stable. ~ Control wattless wave. ~ Increase transmission ability. ~ Provide compensation for AC-DC converter. ~ Improve system static stable. ~ Strengthen low frequency tremble damp. 　SVC在用户侧可发挥的作用 ~ 提高功率因数 ~ 减少无功潮流 ~ 降低电能损耗 ~ 抑制电压波动和闪变 ~ 减少非线性负荷引起的电压影响和谐波干扰 ~ 三相负荷平衡化 　The Functions of SVC for Users SVC ~ Increase power factors. ~ Decrease wattless wave. ~ Decrease power loss. ~ Restrain voltage fluctuate and flicker. ~ Decrease harmonic disturb from non-linear load. ~ Make three phases balanced. 6 7 NOw POwER GRID FACING ThREAT 98 　TCR型SVC补偿原理 SVC的主要功能是改善电压调整率，还可以补偿功率因数。系统、负载和 补偿器的单相等效电路原理图如下图右上。其中U、R、X分别为系统的线电 压、电阻、电抗。当电压变化⊿U＜＜U，并且R＜＜X时，反应系统电压与无 功功率动态补偿关系的特性曲线如下图右下。系统的特性曲线可以用下式近 似： )1(0 Ssc QUU −⋅= 或者 SCS Q U U ∆−=∆ 0 式中，U0－无功功率为零时的系统电压； SSC－系统短路容量。 可见，无功功率的变化引起系统电压成比例的变化。投入补偿器之后，系统 供给的无功功率为负载和补偿无功功率之和，即 Q=QL+Qr 因此，当负载无功功率QL变化时，如果补偿器的无功功率Qr总能够弥补QL变 化，从而使Q维持不变，即⊿Q＝0，则⊿U=0，供电电压保持恒定，这就是 对无功功率进行动态补偿的原理。图中示出了进行动态无功功率补偿，并使 系统工作点保持在Q=QA＝常数的情形。当Q=0时，即图中C点时，实现了功 率因数的完全补偿。 　SVC Working Theory SVC The main function of SVC is to improve voltage adjust rate, and compensate power factor. The single phase equal effect electrical circuit theoretical drawing of system, load and compensator is the picture at left. The U, R,X are repetitively the cable voltage, resistance, reactance. When △U＜＜U, R＜＜X, the characteristics curve of the relationship between reaction system voltage and wattless static compensation is the picture at right. The characteristic curve of system can be described as below: )1(0 Ssc QUU −⋅= or )1(0 Ssc QUU −⋅= U0－system voltage when wattless power rate is zero； SSC－system short circuit capacity. So we can see the change of wattles power causes change of system voltage. The system wattles power is the sum of load and compensation power Q=QL=Qr Therefore, when QL changes, if the Qr can compensate the change of QL, which means △Q＝0, and then △U=0, the power source keeps invariable. The picture shows the static wattless compensation which based on Q=QA.. When Q=0, which is the C point, the complete compensation has been realized. Q UO C B A QL Qr QA0 （b） UO 系统电压U system voltage U 补偿器 compensator 负载 load QL Z=R+jX （a） Qr TCR wORkING ThEORy 1110 轧机 轧机等大型三相对称负载频繁变动电机工作时会产生无功冲击,对电网造成 如下影响。 引起电网电压下降及电压波动，严重时使电气设备无法正常工作使功率因数 降低。 产生有害谐波，主要是5、7、11、13次为主的奇次谐波及其他高频谐波， 使电网电压发生严重奇变。 安装SVC可以很好的消除或削弱上述影响，保持母线电压平稳，消除谐波干 扰，提高功率因数。 Rolling Mill The huge three phases type motor like rolling mill, frequently change symmetrical load to cause wattless impact, can cause below harms. Cause grid voltage decrease and wave, when it is serious, equipment can’t work. Generate harmful harmonic, mainly about add harmonic at 5, 7,11, 13, and other high frequency harmonic, causes grid serious distortion. To be equipped with SVC, can properly reduce above effects, keep bus voltage stable, eliminate harmonic disturb, increase power factor. 电弧炉 电弧炉是冶金行业的重要生产设备，是典型的非线性无规律负荷。电弧炉接 入电网会对电网产生一系列不良影响。 导致电网严重三相不平衡，产生负序电流。 产生谐波，普遍存在如2、4次偶次谐波与3、5、7次等奇次谐波共存情况， 电压畸变加剧。 存在严重的电压闪变。 功率因数低，生产效率低、损耗变大。 解决上述问题的最有效方法是安装动态无功补偿装置（SVC）。九洲公司的 SVC系统响应时间小于10ms，完全可以快速补偿电弧炉的无功功率，稳定 母线电压，抑制闪变。SVC的分相补偿方式可以实现母线三相电压的平衡， 同时滤波装置可以将有害高次谐波滤除。SVC系统可以将功率因数提高到 0.92以上，降低损耗，提高生产效率。 Arc Furnace Arc Furnace is important equipment in metallurgy industry, it is typical non-linear irregular load. To connect it into grid, will cause a series of harmful effects. Cause grid’s three phases unbalanced, generate negative order current. Generate harmonic. The distortion of voltage gets worse. Serious voltage flicker. Low power factor, production efficiency gets low, and waste gets more. The best way to solve above mentioned problem is to equip with SVC. The reaction time of JZE’s SVC is less than 10ms, can completely compensate the wattless power, stabilize bus voltage, restrain flicker. SVC’s compensation method can realize bus three phase voltage balance, and at the same time filtrate harmful high frequency harmonic. The power factor can improve to 0.92, the waste is reduced, the efficiency is improved. 区域变电站 在区域电网中，一般采用分级投切电容器组的方式来补偿系统无功改善功率 因数，这种方式只能向系统提供容性无功，并且不能随负载的变化而实现快 速精确调节，在保证母线功率因数的同时，容易造成向系统倒送无功，抬高 母线电压，危害用电设备及系统稳定性。 九洲公司的静止无功补偿装置（SVC）可以很好地解决上述问题，能够快速 准确地进行无功补偿，稳定母线电压，提高功率因数，彻底解决无功倒送问 题。安装新的SVC系统时，可以充分利用原有的固定电容器组，只需增加晶 闸管相控电抗器（TCR）部分即可，投资节省，效果极佳，成为改善区域电 网供电质量的最有效的方法。 District Substation In the district substation, it is usually apply classified cut type capacitors method to compensate system and improve power factor, this method only can provide capacitor wattless, and the adjustment is not accurate. When assure the power factor, at the same time, cause reversed wattless power, increase bus voltage, influence equipment and system’s stabilization. The JZE’s SVC can properly solve above mentioned problems, can provide wattless compensation rapidly, stabilize bus voltage, improve power factor, completely solve the problem of reversed wattless power. When install the new SVC equipment, can sufficiently use original capacitor, just need to add TCR part, this method save cost, and effective. 长距离电力传输 电力目前正趋向于大功率电网，长距离输送电能，传输功率大，同时也要求 电力系统更加安全可靠。SVC可以明显提高电力系统输配电性能，这已在世 界范围内得到了广泛的证明。可以在电网的一处或多处适合的位置上安装 SVC，以达到如下目的： ~ 稳定弱系统电压 ~ 提高稳态输送容量 ~ 提高系统暂态稳定性 ~ 增强电力系统阻尼 ~ 缓解次同步谐振 ~ 预防电压不稳定 ~ 改善直流输电系统性能 安装SVC系统成为我国目前电网安全高效稳定运行的重要技术保障。 Long Distance Power Transmission The trend of power industry is turning to huge power grid, long distance transmission, and also requires higher safety and reliability. SVC can apparently improve the system’ s ability of transmission, which has been proved world wide. To install SVC at one or more sites in the grid, and fulfill below purpose： ~ Stabilize week system voltage. ~ Increase stable transmission capacity. ~ Increase transient stability. ~ Strengthen power system damp. ~ Relieve secondary synchronic harmonic. ~ Prevent unstable voltage. ~ Improve DC transmission systematical performance To install SVC has become a efficient and safe solution for China’s grid. 　SVC应用领域 APPlICATIONS 1312 电力机车 电力机车采用单相交流供电，造成供电网严重的三相不平衡，并产生谐波和 抚恤电流。而电力机车爬坡时，消耗大量的无功功率，下坡时消耗的无功功 率很小，造成接触网电压波动大幅增加，功率因数严重降低。 安装静态无功补偿装置（SVC），采用分相补偿方式来平衡三相电网，并动 态补偿无功功率，提高功率因数。 Electrical Power Vehicle The electrical power vehicle uses single phase AC power to cause serious three phase unbalance. When the vehicle goes up slope, it consumes vast wattless power, and consumes very little when goes down, this causes power factor seriously decrease. To install SVC, and apply separate phases compensate method to balance there phase grid, with static compensation of wattless power to improve power factor. 提升机、风机、泵类等重工业负载 ~ 这类负载在起动工作过程中会对电网产生以下影响。 ~ 引起电网电压下降及波动。 ~ 功率因数降低。 ~ 变频器整流器等传动装置会产生有害的高次谐波。 ~ 安装SVC可以很好地解决上述问题，通过快速无功补偿稳定网压，提高功 率因数，通过滤波装置滤除系统高次谐波。 Heavy Industry Load like Crane Machine,Wind Motor,Pump etc. ~ These kinds of load can cause following effect to the grid. ~ Grid voltage decreased and waving. ~ Decrease power factor. ~ Harmful high order harmonics. ~ To install SVC can properly solve above problems. By fast wattless compensation, to stabilize grid voltage, increase power factor, to filtrate system’s high order harmonics. 　SVC系统组成 数字式控制系统 ~ 结构：柜式结构 ~ 作用：用于实时计算电网无功，控制晶闸管触发角的大小，进而控制补偿 无功量的大小。 Digital Control ~ structure：cubicle type ~ functions：applied in grid’s wattless calculation, control thyristor touch off angle, then to control volume of wattless compensation. 高压晶闸管阀组 自冷组架式结构，接受来自控制系统的信号，改变晶闸管触发角的大小，产 生相应的无功补偿电流。高压晶闸管选用ABB优质产品，性能良好。高位板 集成自取能，触发监控，BOD保护等多种功能。 High Voltage Thyristor Valves Self cooling frame type, receiving signal from control system, change thyristor touch off angle, to create wattless compensating current. The thyristor valves are ABB products which have good quality and performance. And it has functions touch off monitoring, BOD protection etc. 补偿相控电抗器 ~ 结构：空芯干式，上下双线圈，自然冷却。 ~ 作用：通过晶闸管的电流流经补偿电抗器时，产生系统所需的感性无功， 用于平衡系统无功，保持稳定的母线电压和功率因数。 Compensation Hollow Reactor ~ structure：Hollow dry type, up and down double loops, natural cooling. ~ functions：Generate required compensation, to keep bus voltage and power factor stable. 高次谐波滤波装置 由电抗器、电力电容器、电阻器（有高通通道时使用）三部分组成一个滤波通 道，根据系统要求可以组成多个滤波通道，分别用于滤除相应的高次谐波。 ~ 结构：电抗器为空芯干式，自然冷却。电力电容器为组架式安装，自然冷却。 ~ 作用：消除流经系统的高次谐波，向系统提供容性无功，提高功率因数。 High Order Harmonic Filtrating Device Composed by reactor, power capacitor and resistor, can compose many filtrating channel, in order to filtrate high order harmonic. ~ structure：the reactor is hollow dry type, up and down double loops, natural cooling. Power capacitor is framed installation, natural cooling. ~ Functions：eliminate high order harmonic, provide compensation, improve power factor. SySTEm 1514 　TCR型SVC TCR型SVC的性能指标 ~ 电压：6kV、10kV、27.5kV及35kV ~ 容量：1Mvar～100Mvar。 TCR＋FC型SVC系统组成 ~ 控制器：控制柜＋监控柜 ~ 晶闸管阀组：晶闸管＋高电位触发板＋静态均压电阻＋动态均压电阻、电 容＋BOD ~ 相控电抗器(空心) ~ 滤波电抗器(空心) ~ 固定电容器组 ~ 隔离开关 　TCR type SVC TCR type SVC performance index ~ Voltage：6kV、10kV、27.5kV and 35kV ~ Capacity：1Mvar～100Mvar. The composition of TCR+FC type SVC system ~ Controller：Control cabinet+monitoring cabinet ~ Thyristor valve block：Thyristor+high potential trigger board+static equalizing resistance+dynamic equalizing resistance & capacitor+BOD. ~ Phase controlled reactor (hollow) ~ Filter reactor (hollow) ~ Fixed capacitor bank ~ Isolating switch 产品介绍 Product introduction TCR TyPE SVC . . . . . . 1#机组 发电机1.5MW 690V 风机 \ P 就地 补偿 箱变 35kV 10kV 或35kV 升压站 110kV或220kV 线路补偿 TCR＋FC型SVC 风机 \ P 就地 补偿 67#机组 发电机1.5MW 690V 箱变 35kV Applications：Wind power 应用领域：风力发电 1716 如下图所示，TCR+FC型SVC装置主要由三部分构成：FC滤波器、TCR晶闸管控制电抗器和 控制保护系统。FC滤波器用于提供容性无功功率及谐波滤波，晶闸管控制电抗器 (TCR)用 于平衡系统中由于负载的波动所产生的感性无功功率。通过调节晶闸管触发角的大小，控制 流过电抗器的电流达到控制无功功率的目的。根据负荷无功功率QL的变化情况，改变电抗器 的无功功率QTCR (感性无功功率)。即不管负载的无功功率QL如何变化，总要使二者之和为常 数，这个常数等于电容器组发出的容性无功功率QC的数值，使取自电网的无功功率Q为常数 或为0，即：Q=QC-(QL+QTCR)=常数(或0)，最终使得电网的功率因数保持恒定值，电压几乎 不波动，从而达到无功补偿的目的，以抑制负载波动所造成的系统电压波动和闪变。控制保 护系统通过采集到的供电母线电压及电流，在DSP控制器中计算出所需补偿的导纳值，从而 得出触发角的大小，并通过控制系统发出，改变晶闸管的触发角，来调整流过相控电抗器中 的感性无功电流，实现了供电电网由于负载的变化引起的无功波动的动态跟踪调节。 Shown as above figure, TCR+FC type SVC device is composed of FC filter, TCR thyristor control reactor and control protection system. FC filter is used for providing capacitive reactive power and harmonic filter. Thyristor control reactor (TCR) is used for balancing inductive reactive power produced by load fluctuation in the system. Adjusting the size of thyristor trigger angle can realize the control of current flowing through reactor and the control of reactive power. We can change reactive power QTCR of reactor (inductive reactive power) according to load reactive power QL. That is to say, no matter how to change load reactive power QL, the sum of both must be a constant and it will be equal to the value of capacitive reactive power emitted by capacitor bank to keep reactive power Q from power grid a constant or zero, namely, Q=QC-(QL+QTCR =constant(or zero). Finally, power factor of power grid will remain constant value and it doesn’t have any voltage fluctuation, and then realize reactive compensation in order to restrain system voltage fluctuation and flicker caused by load fluctuation. By acquired voltage and current from power supply bus, control protection system can calculate compensated admittance value in the DSP controller and then obtain the size of trigger angle. Then it can be given out by control system to change thyristor trigger angle, further more adjust inductive reactive current flowing through phase control capacitor so as to realize dynamic tracking regulation of reactive fluctuation caused by change of load in the power grid. 供电变压器 Power supply transformer 高压CT High-Voltage CT 6kV、10kV、27.5kV、35kV 高压PT High-voltage PT 隔离开关柜 Isolating switch cabinet 滤波电抗器 Filter reactor 隔离开关柜 Isolating switch cabinet 电阻器 Resistor 电力电容器 Power capacitor 差流互感器 Differential current transformer 负载 Load 容量QL Capacity QL DSP全数字 控制系统 DSP full-digital control system 控制保护系统 Control protection system 晶闸管控制电抗器容量QTCR The capacity of thyristor control reactor QTCR FC滤波器、容量Qc FC filter & capacity Qc 差流互感器 Differential current transformer 差流互感器 Differential current transformer TCR＋FC型SVC系统工作原理 The working principle of TCR+FC Type SVC system 柜体及阀组型号 Cabinet body and Valve block Type JZESVC－TCR－□/□－□ F：阀组；K：控制柜；J：监控 F: Valve block; K: Control cabinet; J: Monitoring cabinet 电压等级(kV) Voltage grade (kV) 单相阀组晶闸管数量 The Quantities of Single phase valve block thyristor SVC类型：TCR型 SVC Type: TCR Type 九洲电气SVC JZE SVC 产品型号 Product type PowerSolverTM－TCR－□/□－□ 滤波回路支数 Filter circuit count 电压等级(kV) Voltage grade (kV) 可调容量(Mvar) Adjustable capacity (Mvar) SVC类型：TCR型 SVC type: TCR type 注册商标 Registered trademark 产品名称 Product name TCR＋FC型SVC系统相关型号说明 Introduction on related type for TCR+FC type SVC system 技术特点 ~ 控制系统采用基于DSP的全数字化控制器，应用瞬时无功理论进行编程控 制，动态响应快、控制精度高、编程功能强，模块化设计，对几兆至几十兆 装置均可提供一体化的构造方式。 ~ 监控系统提供友好人机界面，实时显示系统工作状态。 ~ 冷却系统采用热管冷却方式，运行噪音低，运行可靠。 ~ 控制方式灵活，可实现三相同时控制、分相控制和三相平衡化等多种控制 方式。 Technical features ~ The adoption of control system is based on DSP full-digital controller and applies instantaneous reactive theory to realize programming control, fast dynamic response, high control precision, favorable programming function and modular design. It can provide integrated structural mode for ten to several tens of mega of device. ~ Monitoring system can provide friendly human-machine interface and working state of real display system. ~ The cooling system is taken use of heat tube cooling method with low operating noise and reliable operation. ~ Flexible control method can realize multiple control modes including three-phase simultaneous control, individual phase contr