Design and Simulation for the Pulse High-Voltage DC Power Supply (HVPS) of 1.2 MW/2.45 GHz HT-7U Lower Hybrid Current Drive System

The superconducting tokamak HT-7U [1] has been designed by the Institute of Plasma Physics since 1998 and will be set up before 2003. The 1.2 MW /2.45 GHz HT-7U LHCD (Lower hybrid current drive) system which being the most efficient non-induction device can heat the plasma and drive the plasma current has been efficiently in operation 'owl and a particular design of the 2.8 MW/-35 kV high-voltage DC power supply has been already completed and will apply to the klystron of LHCD on HT-7 and the future HT-7U, and the project of the power supply has been examined and approved professionally by an authorized group of high-level specialist in the institute of Plasma Physics. The detailed design of the power supply and the simulation results are referred in the paper.

Operation Control Method of Relay Protection in Flexible DC Distribution Network Compatible with Distributed Power Supply

A novel operation control method for relay protection in flexible DC distribution networks with distributed power supply is proposed to address the issue of inaccurate fault location during relay protection,leading to poor performance.The method combines a fault-tolerant fault location method based on long-term and short-term memory networks to accurately locate the fault section.Then,an operation control method for relay protection based on adaptive weight and whale optimization algorithm(WOA)is used to construct an objective function considering the shortest relay protection action time and the smallest impulse current.The adaptive weight and WOA are employed to obtain the optimal strategy for relay protection operation control,reducing the action time and impulse current.Experimental results demonstrate the effectiveness of the proposed method in accurately locating faults and improving relay protection performance.The longest operation time is reduced by 4.7023 s,and the maximum impulse current is limited to 0.3 A,effectively controlling the impact of large impulse currents and enhancing control efficiency.

DC Traction Power Supply System Based on Modular Multilevel Converter Suitable for Energy Feeding and De-icing

A novel DC traction power supply system suitable for energy feeding and de-icing is proposed in this paper for an urban rail transit catenary on the basis of the full bridge submodule (FBSM) modular multilevel converter (MMC). The FBSM-MMC is a novel type of voltage source converter (VSC) and can directly control the output DC voltage and conduct bipolar currents, thus flexibly controlling the power flow of the urban rail transit catenary. The proposed topology can overcome the inherent disadvantages of the output voltage drop in the diode rectifier units, increase the power supply distance and reduce the number of traction substations. The flexible DC technology can coordinate multiple FBSM-MMCs in a wide area and jointly complete the bidirectional control of catenary power flow during the operation of the electric locomotive, so as to realize the local consumption and optimal utilization of the recovered braking energy of the train. In addition, the FBSM-MMCs can also adjust the output current when the locomotive is out of service to prevent the catenary from icing in winter. The working modes of the proposed topology are illustrated in detail and the control strategy is specially designed for normal locomotive operations and catenary de-icing. Simulation cases conducted by PSCAD/EMTDC validate the proposed topology and its control strategy.

一种应用于车载辅助电源的DC-DC变换器

以应用于车载辅助电源模块APM(auxiliary power module)的DC-DC变换器设计为研究对象,提出1种由三电平升压型TL-Boost(three-level Boost)拓扑和半桥LLC谐振拓扑构成的两级式DC-DC变换器拓扑结构,分析其工作原理。前级TL-Boost拓扑将宽范围的输入电压转换为稳定电压,保证了后级半桥LLC谐振拓扑的高效率运行。通过搭建实验平台并进行相关实验,结果验证了所提DC-DC变换器的可行性和正确性。

一种新型软开关双向大变比DC-DC变换器研究

目前,开关电源等电力电子设备主要的能量损耗集中在开关器件上的开关损耗,因此国内外学者对软开关技术进行了大量的深入研究,以期提高电力电子设备的效率。提出一种新型软开关双向大变比DC-DC变换器,通过软开关方案的设计与应用,减小了功率开关管电压尖峰,实现了各功率开关管相应的零电压开通与关断、零电流开通与关断,提升了变换器的效率。对所提变换器的工作原理和模态变化进行了详细的理论分析,并搭建了1台48~400 V、400 W实验样机,验证了理论分析的正确性。

AC/DC通信电源模块远场电磁辐射发射预测研究

AC/DC通信电源产生的电磁辐射易超过限值,对其电磁辐射机理和预测方法开展研究有助于改善电磁兼容性设计。首先,在分析AC/DC通信电源模块共模电磁噪声的形成源头和传播路径后,提出其远场电磁辐射可分解为由“输入端口”、“输出端口”共模电压驱动的2类辐射。然后,提出将共模电压驱动源与寄生辐射体的辐射传递函数相结合,进行远场电磁辐射预测的新方法;设计频谱分析仪+电阻衰减器,实现各共模电压驱动源的频谱测量;采用FEKO电磁仿真软件,通过数值计算得到各寄生辐射体的辐射传递函数。最后,实现了4 kW AC/DC通信电源模块辐射预测,并实测验证了其有效性。

Programmable Voltage Regulating Method for 15 kV High Voltage DC Power Supply

In order to solve the disadvantages caused by mechanical slide rheostat that has big errors and low precision,a novel voltage regulation method for high voltage DC power supply was introduced.The key of this method were digital potentiometer MAXIM 5455 and linear photoelectric coupling LOC110,and application programs were compiled using Visual Basic which was graphical compiling language,furthermore the communication between exterior and computer was carried out by ICP7044D module,in consequence the output value of high voltage DC power supply could be regulated with computer.The measured results showed that this method could accurately,conveniently and rapidly regulate the output value of high voltage DC power supply.

Multi-converter Approach to Higher Power Density DC-DC Converter for 380 V DC Distribution System

Multi-converter approach based on the series and parallel connection topology of modular power converters has been proposed to realize higher power density DC-DC converter. The availability of the proposed approach has been verified through the design consideration and the experiment. The design consideration for two DC-DC converters has been carried out by utilizing the power converter exact loss simulator, and the design parameters to maximize their power densities have been extracted taking the trade-off between the conversion efficiency and the power density into account. The prototypes of a 2,400 W, 256-384 V boost chopper using SiC-MOSFETs and a 300 W, 32-48 V GaN-FETs boost chopper have been also developed based on the design. The SiC chopper achieved the efficiency of 97.8% and the power density of 12,8 W/cm3, and the GaN chopper accomplished 98.9% and 18.6 W/cm3 in the experiment. These results show the validity of the design and the availability of the proposed approach. The multi-converter approach enables the cost reduction of the modular power converters, and contributes to realizing the widespread use of power electronics converters in the future 380 V DC distribution system.

增程式汽车12V DC/DC变换器输出熔断丝熔断问题分析及改进

增程式汽车作为当代传统燃油车向纯电动汽车过渡的车型,在汽车发展中占据着重要地位。DC/DC变换器作为增程式汽车的关键零部件之一,起着至关重要的作用。它将高压电池包输出的高压电转换为合适的电压,为整车及蓄电池供电,确保整车用电器正常用电需求的同时,保证低压蓄电池处于满电状态,是整车供电系统中不可或缺的一环。文章结合某增程式汽车DC/DC变换器输出熔断丝熔断导致蓄电池馈电的问题,进行深入排查,并确认问题发生的根本原因,进而提出优化改进方案,对提高增程式汽车供电系统的可靠性具有重要意义。

Fusion power supply advances by the J-TEXT engineering team

To meet the stringent requirements of the fusion power supply for large-scale fusion devices,the J-TEXT engineering team has carried out key technology research and applications in several important directions of fusion power supply.This article presents the advances made by the J-TEXT engineering team in recent years in the following areas:(1) a high-voltage power supply for an auxiliary heating system;(2) a breakdown protection device for an auxiliary heating power supply;(3) magnetic field compatibility;(4) a high-voltage pulsed power supply for a fieldreversed configuration;(5) a large physics experimental facility control system.The research backgrounds,technical progress,test results,applications,summaries and prospects are described in detail in each part.These innovative research results and valuable engineering experience can promote the progress of fusion power supply technology,and also lay a foundation for the development of power supplies with higher parameters in the future.

高功率密度DC/DC电源模块结构设计与封装

高效率、高功率密度是DC/DC电源模块永恒的发展趋势。以一种封装尺寸为38.72 mm×22.80 mm×7.21 mm、输出功率为320 W的DC/DC模块电源为研制对象,从结构设计、热设计、封装工艺等方面进行了系统的研究。DC/DC电源模块采用“夹心”工艺结构,以高导热塑封工艺封装,工作温度范围为-55~125℃,可靠性满足航空航天领域高可靠要求。

DCS系统冗余切换试验分析

DCS系统作为核电站的控制中心,其设备运行周期越长,存在的缺陷和隐患越多,设备故障率越高。为了排查重要设备的潜在故障和安全隐患,保证核电站设备的安全稳定运行,必须定期对DCS设备进行冗余切换试验,检查设备的可用性和冗余功能。冗余试验一方面检查长期运行设备的可用性,另一方面检查系统自动无扰切换功能。在核电停堆检修期间,仪控人员根据试验程序对DCS系统设备进行切换试验,检验系统中冗余设备的可用性。通过对设备的冗余切换试验,仪控人员全面完整地检查了DCS系统设备的健康状态和运行参数,并对存在隐患的设备进行了更换和维修。

高效率DC/DC转换器在通信电源中的应用研究

文章旨在评估高效率直流/直流(Direct Current/Direct Current,DC/DC)转换器在通信电源中的应用,着重考察最小输出电压、效率、功耗以及瞬态响应等关键性能参数。通过深入研究TPS54160芯片,揭示在不同工作频率下该芯片的性能特点。最后,通过实验验证TPS54160芯片在通信电源中的性能表现,旨在为通信系统的电源设计提供参考和指导。

A Server Placement Algorithm for Reducing Risk and Improving Power Utilization in Data Centers

As the power demand in data centers is increasing,the power capacity of the power supply system has become an essential resource to be optimized.Although many data centers use power oversubscription to make full use of the power capacity,there are unavoidable power supply risks associated with it.Therefore,how to improve the data center power capacity utilization while ensuring power supply security has become an important issue.To solve this problem,we first define it and propose a risk evaluation metric called Weighted Power Supply Risk(WPSRisk).Then,a method,named Hybrid Genetic Algorithm with Ant Colony System(HGAACS),is proposed to improve power capacity utilization and reduce power supply risks by optimizing the server placement in the power supply system.HGAACS uses historical power data of each server to find a better placement solution by population iteration.HGAACS possesses not only the remarkable local search ability of Ant Colony System(ACS),but also enhances the global search capability by incorporating genetic operators from Genetic Algorithm(GA).To verify the performance of HGAACS,we experimentally compare it with five other placement algorithms.The experimental results show that HGAACS can perform better than other algorithms in both improving power utilization and reducing the riskof powersupply system.

Operation Strategy and Matching of Supply and Demand of CCHP System with Various Building Types

The important indications for assessing CCHP(combined cooling,heating and power)systems are their supply-demand matching characteristics between the user demand side and the energy supply side.These characteristics are primarily influenced by different building types and operating strategies.In view of the energy redundancy of the following electric load(FEL)and following thermal load(FTL)operation strategies and the energy deficiency of the following hybrid electric-heating load(FHL)operation strategy,this paper proposes an improved following balanced heat-electrical load(IFBL)operation strategy based on the following balanced heat-electrical load(FBL)operation strategy.Based on the energy utilization rate as the objective function,this paper optimizes the installed capacity of CCHP systems in different buildings and proposes an energy factor for evaluating the supply-demand matching characteristics of the system.The results show that the energy utilization rate and energy factor of the system under IFBL are optimal relative to the other operation strategies.Secondly,the hotel building has the highest energy utilization rate and the lowest energy factor;on the contrary,the office building has the lowest energy utilization rate and the highest energy factor.Finally,the analysis of supply-demand matching for different building types under multiple operating strategies shows that the hospital and hotel systems exhibit optimal supply-demand matching performance under the IFBL strategy,with values of 0.945 and 0.938,respectively;on the contrary,the office system has an optimal supply-demand matching of 0.935 under the FEL strategy.Under the FTL strategy,the systems of all three buildings exhibit poor matching performance.

宽输入电压降压型DC-DC转换器发展综述

电源管理芯片在电子设备系统中担负起对电能的变换、分配、检测及其他电能管理的职责,最常见的结构是线性电源和开关电源。开关电源通过控制开关管开通和关断的时间,维持稳定的输出电压,以其高效率、小型化的特点而广泛应用于几乎所有的电子设备。工业控制系统、汽车电子等领域往往存在多个电压轨,在不同工作阶段还存在输入电压瞬间大范围变换的情况,这要求其具有高输入电压的同时,还需要在一个较宽的输入范围内能够高效地给负载供电。文章围绕宽输入电压DC-DC的转换效率提升、快速响应技术及低EMI设计进行了综合阐述,并分析了学术界和业界的一些最新进展。

一种应用于航天器分布式供电系统的ZVS三端口DC-DC变换器

提出一种应用于航天器分布式供电系统的零电压开关(ZVS)三端口DC-DC变换器(TPC)。对于集成双Buck/Boost双有源桥DC-DC变换器型TPC,一次侧开关管的ZVS范围与3个端口的电压及3个端口之间的传输功率有关。为了实现一次侧开关管ZVS范围的扩展,提出在电路拓扑结构中引入基于耦合电感的辅助电路,相较于传统ZVS实现方法,该拓扑可防止蓄电池端口电流波形上的陷波,进而有利于航天器分布式供电系统中蓄电池寿命的延长。此外,磁耦合电感可减少电感数量,不仅起到滤波作用,还为主开关管提供ZVS实现条件。最后,搭建TPC样机进行实验验证,结果验证该拓扑与控制方法的可行性。

DC/DC隔离型制氢电源发展现状与趋势

随着国家“双碳”目标的推进,电解水制氢将迎来爆发式增长,其中电源的拓扑及控制对提升制氢系统效率具有重要意义。对DC/DC隔离型制氢电源的拓扑进行梳理及分析,针对不同的应用场景,分别从单级型、两级型、并联型和多端口型DC/DC隔离型制氢电源的结构及其优缺点进行分析,结果表明,全桥谐振变换器及考虑电解槽温度、压力及氢/氧交叉渗透反馈的控制方案,将成为适应宽范围、强波动的大功率规模化制氢电源发展趋势,且隔离型三端口DC/DC变换电源将成为分布式集成化电-氢耦合未来发展模式,为电解水制氢电源进一步研究提供参考。

新型混合式贯通牵引供电系统及其复合控制策略

电分相与负序等电能质量问题是制约电气化铁路向高速化、重载化发展的桎梏。贯通牵引供电系统为消弭上述问题提供了契机,但既有贯通方案依然存在所需器件数目多、改造成本高、可靠性差等弊端。为此,在充分利用既有牵引变压器基础上,该文设计一种新型混合式贯通牵引供电装置。该装置通过共直流侧与功率均分手段有效抵消输入侧纹波功率,降低有源/无源器件数目与电容容量。同时,针对直流侧二次纹波与负荷功率冲击,提出一种输入端口复合控制策略,有效解决纹波传递与冲击波动问题。最后通过仿真与实验验证所提装置及其控制策略的可行性与可靠性。

智能型DCS控制电源的研究与应用

在我国工业快速发展的过程中,智能化科技也获得了普遍的应用,其中集散控制系统(DCS)的应用最为广泛。该系统的核心之一在于电源的应用,从传统的开关电源到冗余电源技术再到如今的智能型电源,都对DCS系统有着巨大推进作用。文章将主要针对智能型DCS控制电源进行研究与应用,论述DCS控制系统及其电源的发展,并介绍其应用实例,进一步通过对智能化技术的合理应用,以达到增强系统设备可靠性与安全性的目的,以期能够进一步促进DCS控制和电源控制的技术发展。