Generation of Optimal Voltage Reference for Limit Cycle Oscillation in Digital Control-Based Switching Power Supply

Digital control of a general-purpose switching power supply is one of the key technologies to perform the high reliability and the intelligent function demanded for the next generation. The contribution of this paper is the development of a digital control-based switching power supply. In the developed system, the generation method of the optimal voltage reference to eliminate the limit cycle oscillation of output voltage due to the AD/DA resolution is proposed. In the proposed method, the variation of the input power source voltage can be also compensated. The effectiveness of the proposed optimal reference generation method is experimentally verified.

Development of Full Automatic Flash Butt Welding with Digital Control

The hardware and software design of two digital control systems based on 80C196KB MCU for flash butt welder is introduced in this paper.The welding power supply is made of six-phase half-wave rectifier.The welding outer characteristic of welding machine is realized by digital PI algorithm with the voltage close-loop feedback.The flashing curve is finished by elec- tric-hydraulic servo valve.The process control system transfers datum with power supply system by a serial communication inter- face.The parameters of the control systems are collected by photoelectrical seclusion to avoid the disturbing of the electromagnetism in welding process.

Design of digital controller for HEPS corrector power supply

Purpose In order to realize the control of current closed loop in HEPS corrector power supply,a digital control board is designed.Methods The control board uses the latest FPGA to realize digital processing and uses two different AD chips to realize current and voltage sampling,respectively.In order to achieve high-precision closed-loop control,an effective closed-loop control program is designed.Results The controller has been widely used in HEPS projects,and its control effect has been proved.Conclusions In order to realize control and reduce power cost,the controller is designed.The testing experiments show that the controller has excellent performance,reliable operation and low cost.

A novel testing approach for SSRF digital power supply controllers

Digital power supply controller is one of the key parts of SSRF high resolution high stability magnet power supply system. It is very essential to keep any degradation of these excellent properties by any stages as small as possible via careful testing when the controller is developed. In this study,a novel testing approach was presented,with which a novel closed control loop without actual power converter was constructed,and the new developed SSRF Digital Controller can work well in it.

局部干法水下快频脉冲MIG焊电源研制

针对复杂水下环境焊接过程对焊接电源超高动特性与精确控制需求,设计基于SiC模块的快频脉冲焊接电源功率主电路,开发全数字化控制系统,研制出局部干法水下快频脉冲MIG焊电源(local dry underwater fastfrequency pulsed MIG,LDU-FFPMIG).研制的LDU-FFPMIG焊接电源额定输出电流为400 A,能精确输出多种0~30 kHz的快频脉冲电流波形,快频脉冲电流幅值高达200 A.提出LDU-FFPMIG焊接新工艺,将快频脉冲应用到304不锈钢局部干法水下MIG焊接,探究快频脉冲对传统局部干法水下脉冲MIG焊的影响.结果表明,研制的LDU-FFPMIG焊接电源能够实现稳定的局部干法水下MIG焊,可获得良好的焊缝成形;快频脉冲电流的引入可显著提高电弧能量密度和焊接稳定性,减小熔宽(B)、增大熔深(H),焊缝成形系数(B/H)减小约30%,并且可以细化晶粒.

稠油电加热嵌入式控制装置设计及其试验

为提高稠油井电加热系统的加热效率,解决油田中频电源加热运行控制主要依靠人工经验设置和低效的自动控制造成电能浪费的现状,本文设计了稠油电加热嵌入式控制装置。基于非嵌入式获取的油井生产电信号,以稠油开采电机的电功率为闭环反馈信号,获取油液最优温度的参考输入。在此基础之上,通过井口油液温度的微分反馈环节,改善温度迟滞效应,实现中频电源的节能优化控制。通过对嵌入式硬件核心电路模块的设计和主要软件功能的开发,不仅实现了稠油井电加热过程的动态控制,还实现了各项运行指标的现场及云端的实时监测。稠油井场试验分析表明,所设计的稠油电加热嵌入式控制装置符合井场节能安全的生产需求,节约能耗可达20%。

Research on the application of digital power supply based on domestic FPGA

Purpose The digital controller for the accelerator magnet power supply typically employs a field-programmable gate array(FPGA)as the signal processing chip for executing digital processing of closed-loop control.Currently,FPGA chips are predominantly utilized in Intel or Xilinx products.To address the“key areas and stranglehold”issue pertaining to FPGA chips in accelerator power supply,we have devised a digital power supply prototype using a domestic FPGA chip and validated its feasibility in the upgrade project’s magnet power supply digital transformation plan for the Beijing Electron Positron Collider(BEPCII).Method A domestic FPGA chip from the Seal5000 SA5Z-30-D1 series by Xi’an ZhiDuoJing Microelectronics Co.serves as the core component for the design of a digital corrector magnet power supply to replace the existing analog controlled corrector power supply at BEPCII.The power supply’s digital control of the closed loop is achieved through the use of a hardware description language,and the digital controller hardware is constructed based on the original power supply power topology.Results and conclusions After conducting experiments and tests on the power supply prototype,we have successfully met the current operational requirements of the BEPCII corrector power supply,thus confirming the feasibility of utilizing domestic FPGA for digital application on accelerator power supply.

基于LabVIEW的多路高压电源自动化测试系统

为提高高压电源测试校准过程的效率,基于LabVIEW开发环境设计了一款集万用表34461A仪器控制和高压电源远程控制为一体的自动化测试软件。该软件以LabvVIEW仪器驱动作为基础,通过合理的软件编程将传统的人工逐点记录数据转变为计算机自动设置保存数据,大大节约了测试校准的时间,提高了高压电源的研发效率。

核电厂控制系统逻辑验证方案改进研究

随着自主三代核电技术的稳步推进,在建核电项目面临控制系统逻辑验证量大、工期长的问题,而现有验证方案源于二代加核电项目,限制了逻辑验证效率的提升。针对此问题,对国内二代加、自主三代核电项目的控制逻辑特点和验证策略进行分析和归纳,以总结现有方案在工程实践中存在的问题。在此基础上,从验证策略、组织模式、实施方法三个维度研究应对措施,提出了重构逻辑测试场景、引入仿真技术、建立自动化测试系统的改进方案。改进方案和原方案的效益对比结果表明,改进方案的工作量和工期均大幅减少。改进方案提升了逻辑验证的实施效率和工程效益,对工程实际问题提出了针对性解决措施。该研究对后续批量化推进三代核电项目工程建设具有参考价值。

关于数据中心10kV电源切换的探讨

数据中心10kV电源切换涉及到市电电源切换和柴油发电机并机控制两个系统,两个系统分别独立控制,逻辑控制复杂,稳定性相对欠缺。本文通过对数据中心10kV电源常用切换方式的分析与对比,重点介绍了数字化电源切换系统的解决方案、功能实现方式和应用优势。

某型航空发动机抗电源失效设计与试验验证

为应对外部电源可能出现的失效问题,某航空发动机控制系统开展电子控制器储能电路设计,并选用具有零偏功能的电液伺服阀。通过改造台架电源配置、增加延时继电器,实现模拟电源短时中断50ms和完全失效功能。整机电源失效试验表明,某航空发动机电子控制器CPU在外部电源短时中断50ms条件下可保持稳定工作,可取消配套应急电源设备;在电源完全失效情况下可通过切断关闭主燃油、调节几何角度使发动机安全停车,发动机性能和操纵性未发生变化,满足飞机使用要求。

基于STM32H7的ADC静态参数测量系统设计

国内的数字电源已经成为电源类芯片中不可或缺的产品,其内部反馈控制回路中的模数转换器(ADC)芯片精度直接影响整个电源输出的精度和稳定性。ADC静态参数——积分非线性(INL)与微分非线性(DNL)——是评价ADC精度的重要指标,目前国内针对数字电源中ADC的静态参数测试的设备操作复杂、成本高,缺乏相应的灵活性,因此设计一种低成本、易操作的静态参数测试系统尤为重要。设计了一种基于STM32H7的ADC静态参数测试系统,通过试验验证了测试系统的准确性和可行性。

低频电源柜专用测试平台的设计及实现

鉴于棒控棒位系统低频电源柜的信号特性独特、插件接口多样化,传统的测试仪器往往难以全面满足其测试需求。为了确保低频电源柜在出厂前经过充分的测试和验证,设计了一套专用测试平台。该平台可以针对低频电源柜的低频电源插件、配电插件以及整体低频电源柜提供必要的外部输入,并自动校验输出的正确性,从而实现对测试需求的全面验证。该平台已在某核电项目低频电源柜的功能性能测试上成功应用,不仅缩短了测试周期,降低了测试成本,还提高了测试准确性。测试结果完全满足上游设计输入要求,为后续棒控棒位系统成套设备自动测试平台的开发提供了参考。

两站串供远方备自投系统控制策略的优化及应用

为提高两站单链式供电结构的小型配电网的供电安全,提出一种远方备自投系统控制策略,该控制策略基于无主对等通信的控制模式,采用毫秒级实时交互信息,实现自动识别开环点、故障定位,快速进行故障隔离、小电源切除、供电恢复,可自动识别安稳系统切负荷并闭锁备自投;同时基于国家电网公司九统一低压标准化装置硬件,不改变开入、开出、模拟量、电源等接口的定义方式,仅在CPU板卡增加专用通信模块,降低了成本,方便现场施工和改造升级。仿真测试及现场应用结果均验证了该控制策略的有效性,对其他区域相同电网结构的远方备自投的研究也具有一定的借鉴意义。

A comparative study of digital low dropout regulators

Granular power management in a power-efficient system on a chip(SoC)requires multiple integrated voltage regulators with a small area,process scalability,and low supply voltage.Conventional on-chip analog low-dropout regulators(ALDOs)can hardly meet these requirements,while digital LDOs(DLDOs)are good alternatives.However,the conventional DLDO,with synchronous control,has inherently slow transient response limited by the power-speed trade-off.Meanwhile,it has a poor power supply rejection(PSR),because the fully turned-on power switches in DLDO are vulnerable to power supply ripples.In this comparative study on DLDOs,first,we compare the pros and cons between ALDO and DLDO in general.Then,we summarize the recent DLDO advanced techniques for fast transient response and PSR enhancement.Finally,we discuss the design trends and possible directions of DLDO.

基于数字控制塔的电网物资供应链战略运营转型

针对电网物资供应链战略运营转型中面临的问题,基于供应链控制塔理论,首先,从数据治理到运营体系、从多跨场景到全局可视、从内部管控到外部协同,提出“双中台数治、两中心协作”的电网物资供应链数字控制塔模式。其次,面向运营分析决策、资源优化配置、风险监控预警、数据资产应用与应急调配指挥等供应链综合运营,开发大数据分析模型和智能决策工具,实现“数据业务双轮驱动、内外专业多跨协同”运营数智转型。最后,介绍了浙江电力宁波公司在废旧资产处置协同管控上的应用实践,表明了供应链数字控制塔模式对于电网物资供应链战略运营数智转型具有重要价值。

高精度霍尔电推进技术的应用与发展研究

在现代化全域通信导航的应用背景下,卫星平台所需具备的精确轨道预测与实时轨道控制能力对电推进系统的推力精度、分辨率等性能提出更高的要求,因此建设高精度的电推进系统具有非常重要的意义。通过对空间应用需求和电推进技术现状的分析,阐明了当前电推进技术的推力输出精度不足以支撑高精度连续导航、超低轨卫星实时阻力补偿以及高分辨率遥感卫星动中成像等空间任务的需求。在此基础上,以霍尔推进系统为研究对象,针对研制高精度推进系统的技术难点,从霍尔推力器技术、流量控制技术、电源及控制技术和试验验证技术四个方面阐述了国内外研究的现状,分析和探讨了关键技术的发展方向和研究思路,为高精度霍尔推进技术未来的重点研究和发展方向提出建议。

离子电推进系统电源处理单元的数字化设计

为了降低航天器的质量,提高使用寿命,满足商业航天小卫星电推进系统需求,概述了电源处理单元(power processing unit,PPU)数字化设计的需求及屏栅电源设计方案,针对电源处理单元的高精度、高稳定性、快速响应的要求,采用BUCK方案和全桥电路设计屏栅电源。以STM32微控制器为核心设计数字化加热电源和屏栅电源,实现卫星平台/地检设备的数据采集遥测,电源输出电压参数的改变。实验结果表明:三个数字化电源的控制精度均小于3%,数字化控制的电源处理单元具有灵活调整的特点,能够有效减少控制板体积。

基于无模型自适应控制的数字电源研究

近年来,开关电源正朝着智能化、数字化方向发展,数字电源需要精准可靠的控制算法。针对不易建立数学模型的非线性电源系统较难选择合适的控制算法的问题,对无模型自适应控制(Model-Free Adaptive Control,MFAC)算法进行了研究,并基于该算法设计实现了一款180 V输入、2000 V输出的数字电源。该电源以STM32F103为主控芯片、LLC拓扑为主电路,通过MFAC算法改变PWM占空比,并实现对电源系统的监测、控制、通信、显示等功能。实验表明,将MFAC算法应用在LLC拓扑中能够对电源系统实现较好地控制,并能够稳定可靠工作、达到指标要求。实验验证了MFAC算法在LLC拓扑中应用的可行性。

基于DSP的电子束选区熔化束流调控系统的研制

为了获得稳定的电子束流输出,提高电子束选区熔化成形质量,研制了一套基于DSP的电子束选区熔化束流调控系统。使用DSP的通用定时器和比较寄存器产生频率为20 kHz、占空比与死区时间可调的PWM脉冲;设计高压、束流信号反馈采样电路;DSP采用积分分离PID控制算法实现束流的快速调节和闭环调控。试验结果表明该控制系统所控制的电子枪在带载时最大束流达到150 mA,高压、灯丝加热电流给定时,随着偏压降低,束流逐渐增大,实现了稳定的束流输出。