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Adaptive Reclosing Scheme Based on Traveling Wave Injection For Multi-Terminal dc Grids
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作者 Peng Han Xinchen Zhao +2 位作者 YannanWu Zhiyu Zhou Qi Qi 《Energy Engineering》 EI 2023年第5期1271-1285,共15页
The hybrid dc circuit breaker(HCB)has the advantages of fast action speed and low operating loss,which is an idealmethod for fault isolation ofmulti-terminal dc grids.Formulti-terminal dc grids that transmit power thr... The hybrid dc circuit breaker(HCB)has the advantages of fast action speed and low operating loss,which is an idealmethod for fault isolation ofmulti-terminal dc grids.Formulti-terminal dc grids that transmit power through overhead lines,HCBs are required to have reclosing capability due to the high fault probability and the fact that most of the faults are temporary faults.To avoid the secondary fault strike and equipment damage that may be caused by the reclosing of the HCB when the permanent fault occurs,an adaptive reclosing scheme based on traveling wave injection is proposed in this paper.The scheme injects traveling wave signal into the fault dc line through the additionally configured auxiliary discharge branch in the HCB,and then uses the reflection characteristic of the traveling wave signal on the dc line to identify temporary and permanent faults,to be able to realize fast reclosing when the temporary fault occurs and reliably avoid reclosing after the permanent fault occurs.The test results in the simulation model of the four-terminal dc grid show that the proposed adaptive reclosing scheme can quickly and reliably identify temporary and permanent faults,greatly shorten the power outage time of temporary faults.In addition,it has the advantages of easiness to implement,high reliability,robustness to high-resistance fault and no dead zone,etc. 展开更多
关键词 multi-terminal dc grid hybrid dc circuit breaker adaptive reclosing fault type identification traveling wave reflection characteristic
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Stability Analysis of a Multi Area System with Renewable Energy and Multi-Terminal DC Tie Lines
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作者 Moses Peter Musau 《Journal of Power and Energy Engineering》 2018年第9期85-96,共12页
Security constrained multi area multi objective dynamic economic dispatch (SCMAMODED) with renewable energy (RE) and all the possible MTDC stability constraints is formulated for the first time. The stability merits o... Security constrained multi area multi objective dynamic economic dispatch (SCMAMODED) with renewable energy (RE) and all the possible MTDC stability constraints is formulated for the first time. The stability merits of multi terminal DC (MTDC) tie lines as compared to the traditional HVAC forms the main objective of this paper. Probabilistic load flow (PLF) is applied to determine the system parameters while the uncertainties are modelled using Scenario Based Method (SBM). The simulation results reveal that with the use of MTDC tie lines, the frequency and voltage stability in the MAMODED with renewable energy sources (RES) are enhanced while keeping the MTDC power exchange interface nodes at secure levels. 展开更多
关键词 multi-terminal dc (MTdc) TIE Lines Probalistic Load Flow (PLF) RENEWABLE Energy Sources (RES) Security Constrained Multi-Area Multi-Objective Economic DISPATCH (SCMAMODED) Stability
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模块化高压大容量DC/DC变换器综述 被引量:3
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作者 张书鑫 赵若凡 刘鸿鹏 《东北电力大学学报》 2024年第1期52-60,共9页
随着新能源发电占比增加和电网规模的不断扩大,直流输电系统的容量不断提升,含有不同电压等级的直流电网是未来发展的必然趋势。在此背景下,DC/DC变换器作为直流电网关键设备,在多电压等级互联场景中发挥着重要作用。文中首先对已有的... 随着新能源发电占比增加和电网规模的不断扩大,直流输电系统的容量不断提升,含有不同电压等级的直流电网是未来发展的必然趋势。在此背景下,DC/DC变换器作为直流电网关键设备,在多电压等级互联场景中发挥着重要作用。文中首先对已有的模块化高压大容量DC/DC变换器进行归纳、分类和比较,然后阐述了目前模块化高压大容量DC/DC变换器的拓扑结构、工作原理与特点,并针对其特点提出了不同变换器的适用场景,最后对未来的研究方向提出了建议。 展开更多
关键词 柔性直流输电 直流电网 模块化多电平换流器 模块化高压大容量dc/dc变换器
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基于限流电抗器两侧特定频段暂态能量比的MTDC电网单端量保护方案 被引量:2
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作者 刘晓军 金小东 +2 位作者 刘迎迎 赵冠雄 刘亚东 《智慧电力》 北大核心 2024年第1期87-94,共8页
柔性直流输电技术有利于未来大量分布式能源接入电网,而配置快速、可靠的保护方案是柔性直流技术发展的关键。基于直流电网等效模型,提出一种基于限流电抗器两侧电压特定频段暂态能量比差异性的单端量故障区域识别方法。该方法依据贝瑞... 柔性直流输电技术有利于未来大量分布式能源接入电网,而配置快速、可靠的保护方案是柔性直流技术发展的关键。基于直流电网等效模型,提出一种基于限流电抗器两侧电压特定频段暂态能量比差异性的单端量故障区域识别方法。该方法依据贝瑞隆等效模型计算出限流电抗器两侧电压比,通过广义S变换提取限流电抗器两侧特定频段电压,根据故障时正负极限流电抗器的电压幅值差的差异性实现故障选极。最后在PSCAD/EMTDC平台搭建仿真模型,分析出发生区内外故障时差异性明显,具备较强的耐过渡电阻与抗噪声干扰能力。 展开更多
关键词 多端柔性直流电网 暂态能量比 单端量保护 线路保护 故障选极
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不平衡电网下AC-DC矩阵变换器的新型模型预测控制
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作者 邓文浪 吴明海 +1 位作者 谢海鹏 胡英杰 《系统仿真学报》 CAS CSCD 北大核心 2024年第9期2159-2170,共12页
为降低AC-DC矩阵变换器在输入不平衡条件下网侧有功功率波动,以及离散型模型预测控制中开关频率不固定的问题,提出一种新型模型预测控制方法。通过根据电网电流相位角选择有效矢量,避免了传统模型预测控制评估价值函数计算的负担。提出... 为降低AC-DC矩阵变换器在输入不平衡条件下网侧有功功率波动,以及离散型模型预测控制中开关频率不固定的问题,提出一种新型模型预测控制方法。通过根据电网电流相位角选择有效矢量,避免了传统模型预测控制评估价值函数计算的负担。提出了一种二阶扩展复数卡尔曼滤波器,计算精度可以达到泰勒级数展开的二阶项,新型模型预测控制能够在不平衡电网系统中应用。仿真结果表明:所提控制策略在输入电压不平衡工况下,能够有效抑制网侧电流谐波,稳定系统输出的有功功率,并且表现出良好的性能。 展开更多
关键词 AC-dc矩阵变换器 模型预测控制 卡尔曼滤波器 不平衡电网 对称分量
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Analysis of DC Grid Prospects in China 被引量:173
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作者 WEN Jialiang WU Rui Peng Chang Wang Yu 《中国电机工程学报》 EI CSCD 北大核心 2012年第13期I0002-I0002,185,共1页
随着化石能源的日益枯竭,中国已将发展可再生能源提升至重要地位,并逐步实现能源结构的战略性调整。分析可再生能源发电的间歇性与不稳定性特点,以及可再生能源发电集中并网带来的稳定性问题,提出通过建设广域覆盖的直流电网以有效... 随着化石能源的日益枯竭,中国已将发展可再生能源提升至重要地位,并逐步实现能源结构的战略性调整。分析可再生能源发电的间歇性与不稳定性特点,以及可再生能源发电集中并网带来的稳定性问题,提出通过建设广域覆盖的直流电网以有效解决可再生能源集中并网的有功波动问题。建设全国性的直流骨干输电网,不仅可更有效地利用可再生能源,也将积极推动坚强智能电网的建设。与交流系统相比,直流电网在未来城市配电、微网等领域也有较大的优势。根据中国国情,对直流电网在中国建设的可行性进行了具体分析,并提出中国直流电网主干结构设想图,指出了直流电网建设的一些关键技术问题,为中国直流电网建设提供参考。 展开更多
关键词 直流电网 中国 可再生能源发电 电网系统 不稳定 间歇性 发电厂
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基于CRS-LMD和SVD的MMC-HVDC线路故障测距方法 被引量:3
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作者 贺宇阳 马千里 +1 位作者 于飞 刘喜梅 《电力系统保护与控制》 EI CSCD 北大核心 2024年第1期121-132,共12页
直流输电线路故障行波波速不确定、波头提取困难以及噪声干扰等因素制约了直流电网中故障测距技术的应用。为了降低上述因素对定位准确性的影响,提出一种基于局部特征有理样条插值均值分解(LMD based on characteristic rational spline... 直流输电线路故障行波波速不确定、波头提取困难以及噪声干扰等因素制约了直流电网中故障测距技术的应用。为了降低上述因素对定位准确性的影响,提出一种基于局部特征有理样条插值均值分解(LMD based on characteristic rational spline,CRS-LMD)和奇异值分解(singular value decomposition,SVD)的故障测距方法。首先,利用特征尺度选取最优极点系数,结合有理样条插值调节拟合曲线的松紧程度,实现对故障电压行波的局部均值分解。其次,采用奇异值分解对故障行波波头进行准确提取。最后,在PSCAD/EMTDC中搭建了张北±500 kV柔性直流电网的仿真模型,模拟各种故障情况并输出故障数据,利用Matlab对故障数据进行处理并验证定位算法。最后,仿真结果表明,所提故障测距算法在不同故障距离和故障类型下均能实现故障测距,且在叠加噪声和过渡电阻的情况下也能保障较高的精确性。 展开更多
关键词 串柔性直流电网 有理样条插值 局部均值分解 奇异值分解 行波提取 故障测距
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Control Strategy of DC Link Voltage Flywheel Energy Storage for Non Grid Connected Wind Turbines Based on Fuzzy Control 被引量:2
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作者 Arslan Habib Chan Sou Adesh Ananta 《Journal of Power and Energy Engineering》 2017年第11期72-79,共8页
The large-scale development of wind power is an important means to reduce greenhouse gas emissions, alleviate environmental pollution and improve the utilization rate of renewable energy. At the same time, large-scale... The large-scale development of wind power is an important means to reduce greenhouse gas emissions, alleviate environmental pollution and improve the utilization rate of renewable energy. At the same time, large-scale non grid connected wind power generation theory avoids the technical difficulties of wind power integration [1]. However, due to the randomness and uncontrollability of wind energy, the output power of the wind power generation system will fluctuate accordingly [2]. Therefore, the corresponding energy storage devices are arranged in the non-grid-connected wind power generation system to ensure the power quality, and it has become the key to full utilization of renewable energy. In the case of wind speed fluctuation, the DC bus control strategy of the wind turbine is proposed in this paper. It can reduce the impact on the unit converter and the power load;this ensures safe and stable operation of non-grid connected wind turbines. 展开更多
关键词 Non-grid CONNECTED WIND Power Generation dc BUS VOLTAGE Control Strategy
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HVDC Grid Segmentation Analysis for Blackouts Reduction
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作者 Grazielle Jacinta Cardoso Santos Patrícia Romeiro da Silva Jota 《Journal of Power and Energy Engineering》 2017年第3期36-48,共13页
Segmentation of large AC systems through DC links introduces a new concept that utilizes the advantages of direct current transmission to improve network reliability and increase power transfer capacity. Technical lit... Segmentation of large AC systems through DC links introduces a new concept that utilizes the advantages of direct current transmission to improve network reliability and increase power transfer capacity. Technical literature argues that the segmentation of the AC network and the introduction of DC links at these systems connection points bring benefits to system operation, once contingencies generated on one side of the DC connection point would not be reflected on the other side of DC connection, thereby reducing the likelihood of cascading shutdowns and blackouts due to load restraint on transmission lines and transformers. Amidst this scenario, this paper presents a study of the main topics regarding the use of this new network segmentation philosophy, bringing a practical point of view for the use of this concept at the electrical power system planning. The effect of DC segmentation before a contingency that would initiate major outages in an adapted electrical system model IEEE-14 bus is studied and simulations have been performed with test HVAC systems and segmented by HVDC link. The results have been compared, principally in relation to the voltage bus, reactive power generation, system losses and power flow at the lines, and demonstrated that this new concept improved the grid reliability. 展开更多
关键词 dc-Segmentation grid SEGMENTATION dc LINK BLACKOUTS CASCADING OUTAGES
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Practice and Prospect of AC/DC Hybrid Power Grid in Southern China
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作者 By Wang Jiuling China Southern Power Grid Co., Ltd. 《Electricity》 2005年第A04期37-42,共6页
China Southern Power Grid is a unique EHV AC/DC hybrid transmission network that operates in China. In its service area, the distribution of energy resources and the development of economy are extremely unbalanced, so... China Southern Power Grid is a unique EHV AC/DC hybrid transmission network that operates in China. In its service area, the distribution of energy resources and the development of economy are extremely unbalanced, so long-distance and bulk power transmission are needed; besides, the geography and climate conditions are serious, rains, fogs, lightning and typhoon as well as high temperature are common all the year round. Facing these challenges, the power grid enhanced stability control, improved the equipment and strengthen the network structure. In the future, the power grid plans to optimize the disposition of power sources and build digitalized power system. 展开更多
关键词 AC/dc HYBRID power grid stability control
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Development and Research of Bypass Device to Improve DC Grid Performance
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作者 Jongman Kim Seokhoon Hong Beobseong Song 《Journal of Electrical Engineering》 2019年第1期8-13,共6页
Among the factors determining the performance of the new renewable energy system, the processing part of the untreated DC power is a very important element. In fact, the area where the loss of the new renewable energy... Among the factors determining the performance of the new renewable energy system, the processing part of the untreated DC power is a very important element. In fact, the area where the loss of the new renewable energy system is greatest is also the DC transmission and distribution technology. It is critical to prevent this loss and to improve the performance of the system, and analyze the performance of the resulting through the application of the resulting algorithms. In this thesis, we are discussing ways to calibrate the error in the PV distribution system within the solar power generation system using the Bypass Line Configuration Algorithm. I would like to note that if the operation of the Bypass Line device generates electrical abnormalities in the system’s circuits, it can recover the performance of the system, thereby improving performance. 展开更多
关键词 dc grid BYPASS DIODE dc TRANSMISSION
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Fault Identification and Islanding in DC Grid Connected PV System
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作者 M. Mano Raja Paul R. Mahalakshmi +2 位作者 Murugesan Karuppasamypandiyan Ananthan Bhuvanesh Rajendran Jai Ganesh 《Circuits and Systems》 2016年第10期2904-2915,共12页
Nowadays, the DC distribution system has been suggested, as a replacement for the AC power distribution system with electric propulsion. This idea signifies a fresh approach of issuing energy for low-voltage installat... Nowadays, the DC distribution system has been suggested, as a replacement for the AC power distribution system with electric propulsion. This idea signifies a fresh approach of issuing energy for low-voltage installations. It can be used for any electrical application up to 20 MW and works at a nominal voltage of 1000 V DC. The DC distribution system is just an extension of the multiple DC links that previously available in all propulsion and thruster drives, which typically comprise more than 80% of the electrical power consumption on electric propulsion vessels. A fault detection and islanding scheme for DC grid connected PV system is presented in this paper. Unlike traditional ac distribution systems, protection has been challenging for dc systems. The goals of this paper are to classify and detect the fault in the PV system as well as DC grid and to isolate the faulted section so that the system keeps operating without disabling the entire system. The results show the measured values of power at PV panel and DC grid side under different fault condition, which indicates the type of fault that occurs in the system. 展开更多
关键词 PV System dc grid Fault Identification ISLANDING
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Fuzzy Logic Controlled Dual Active Bridge Series Resonant Converter for DC Smart Grid Application
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作者 Thabit Salim Nassor Atsushi Yona Tomonobu Senjyu 《Journal of Energy and Power Engineering》 2015年第8期741-752,共12页
Over the last few years, smart grids have become a topic of intensive research, development and deployment across the world. This is due to the fact that, through the smart grid, stable and reliable power systems can ... Over the last few years, smart grids have become a topic of intensive research, development and deployment across the world. This is due to the fact that, through the smart grid, stable and reliable power systems can be achieved. This paper presents a fuzzy logic control for dual active bridge series resonant converters for DC smart grid application. The DC smart grid consists of wind turbine and photovoltaic generators, controllable and DC loads, and power converters. The proposed control method has been applied to the controllable load's and the grid side's dual active bridge series resonant converters for attaining control of the power system. It has been used for management of controllable load's state of charge, DC feeder's voltage stability during the loads and power variations from wind energy and photovoltaic generation and power flow management between the grid side and the DC smart grid. The effectiveness of the proposed DC smart grid operation has been verified by simulation results obtained by using MATLAB and PLECS cards. 展开更多
关键词 dc smart grid dual active bridge series resonant converter wind turbine controllable loads photovoltaic.
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Rapid Parameter-Optimizing Strategy for Plug-and-Play Devices in DC Distribution Systems under the Background of Digital Transformation
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作者 Zhi Li Yufei Zhao +2 位作者 Yueming Ji Hanwen Gu Zaibin Jiao 《Energy Engineering》 EI 2024年第12期3899-3927,共29页
By integrating advanced digital technologies such as cloud computing and the Internet of Things in sensor measurement,information communication,and other fields,the digital DC distribution network can efficiently and ... By integrating advanced digital technologies such as cloud computing and the Internet of Things in sensor measurement,information communication,and other fields,the digital DC distribution network can efficiently and reliably access DistributedGenerator(DG)and Energy Storage Systems(ESS),exhibiting significant advantages in terms of controllability and meeting requirements of Plug-and-Play(PnP)operations.However,during device plug-in and-out processes,improper systemparametersmay lead to small-signal stability issues.Therefore,before executing PnP operations,conducting stability analysis and adjusting parameters swiftly is crucial.This study introduces a four-stage strategy for parameter optimization to enhance systemstability efficiently.In the first stage,state-of-the-art technologies in measurement and communication are utilized to correct model parameters.Then,a novel indicator is adopted to identify the key parameters that influence stability in the second stage.Moreover,in the third stage,a local-parameter-tuning strategy,which leverages rapid parameter boundary calculations as a more efficient alternative to plotting root loci,is used to tune the selected parameters.Considering that the local-parameter-tuning strategy may fail due to some operating parameters being limited in adjustment,a multiparameter-tuning strategy based on the particle swarm optimization(PSO)is proposed to comprehensively adjust the dominant parameters to improve the stability margin of the system.Lastly,system stability is reassessed in the fourth stage.The proposed parameter-optimization strategy’s effectiveness has been validated through eigenvalue analysis and nonlinear time-domain simulations. 展开更多
关键词 dc distribution system digital grid small-signal stability eigenvalue parametric sensitivity particle swarm optimization parameter boundary calculation parameter tuning
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Nyquist Stability Analysis and Capacitance Selection for DC Current Flow Controllers in Meshed Multi-terminal HVDC Grids 被引量:4
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作者 Puyu Wang Shihua Feng +2 位作者 Pengcheng Liu Ningqiang Jiang Xiao-Ping Zhang 《CSEE Journal of Power and Energy Systems》 SCIE CSCD 2021年第1期114-127,共14页
Controllability of DC current/power flow is essentialin multi-terminal HVDC (MTDC) grids, particularly for theMTDC grids in a meshed topology. In this paper, consideringmeshed MTDC (M2TDC) grids with the installation ... Controllability of DC current/power flow is essentialin multi-terminal HVDC (MTDC) grids, particularly for theMTDC grids in a meshed topology. In this paper, consideringmeshed MTDC (M2TDC) grids with the installation of twoline/multi-lineDC current flow controllers (CFCs), a small-signalmodel of the DC CFCs integrated M2TDC grids is derived,studying the impact of the power losses of the DC CFC andtheir influence on the analysis of energy exchanges. The systemstability analysis is analysed using the Nyquist diagram, which ismore suitable for analyzing complex nonlinear systems with morecompact and reliable indicators of stability in comparison withgain/phase margins shown in the Bode diagram. In addition, aselection method of the interconnected capacitor of the DC CFCis proposed under different operating conditions. The impact ofthe switching frequencies of the DC CFC on the control ranges ofthe DC current flows is analyzed. The effectiveness of the Nyquistanalysis and the capacitance selection method is verified bysimulation studies using PSCAD/EMTDC. The obtained control ranges of the DC CFC with different switching frequenciesand capacitances would be useful for practical engineeringapplications. 展开更多
关键词 Capacitance selection method control ranges dc current flow controller(CFC) meshed multi-terminal HVdc(M2Tdc)grid Nyquist stability analysis small-signal modelling switching frequencies
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构网型单元异常下的孤岛交直流混合微电网群分布式协同控制策略
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作者 贾宏杰 张育炜 +3 位作者 肖迁 穆云飞 金昱 陆文标 《天津大学学报(自然科学与工程技术版)》 北大核心 2025年第3期221-236,共16页
当构网型单元处于限功率运行与故障等工况下,传统孤岛交直流混合微电网群分布式协同控制方法易造成交流子微网母线电压与频率失去支撑,进而导致系统失稳.为解决上述问题,本文提出了一种面向构网型单元限功率运行与故障工况的孤岛交直流... 当构网型单元处于限功率运行与故障等工况下,传统孤岛交直流混合微电网群分布式协同控制方法易造成交流子微网母线电压与频率失去支撑,进而导致系统失稳.为解决上述问题,本文提出了一种面向构网型单元限功率运行与故障工况的孤岛交直流混合微电网群分布式协同控制策略.当子微网构网型单元处于限功率运行或故障工况时,首先,在构网型单元异常子微网变换器控制层,构网型单元将输出功率钳位于最大值或退出运行,跟网型单元通过与互联变换器进行二次协同控制,实现功率的合理分配;其次,在网间互联变换器控制层,与构网型单元异常子微网相连的互联变换器转为构网型控制模式,为构网型单元异常子微网提供母线电压与频率支撑,其余互联变换器按照正常子微网自身剩余容量分担构网型单元异常子微网所需的支撑功率.多工况下的仿真结果表明,当负荷连续增加,构网型单元处于限功率运行工况时,所提分布式协同控制策略可通过网间互联变换器的变模式运行,实现构网型单元异常子微网交流母线电压与频率的快速恢复、跟网型单元输出功率的精准分配;当构网型单元处于故障工况时,所提分布式协同控制策略可以有效解决构网型单元异常子微网因交流母线电压与频率失去支撑导致的失稳问题. 展开更多
关键词 孤岛交直流混合微电网群 分布式协同控制 构网型单元 异常运行工况 电压与频率支撑 功率分配
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用于直流电网的大容量DC/DC变换器研究综述 被引量:63
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作者 杨晓峰 郑琼林 +4 位作者 林智钦 薛尧 王志冰 姚良忠 陈博伟 《电网技术》 EI CSCD 北大核心 2016年第3期670-677,共8页
发展高压直流电网是解决电能大容量远距离传输及大规模可再生能源汇集的有效手段,高压大容量DC/DC变换器是实现不同电压等级的直流电网线路之间互联的关键设备,也是制约直流电网推广的主要技术瓶颈之一。然而已发表的研究工作主要集中于... 发展高压直流电网是解决电能大容量远距离传输及大规模可再生能源汇集的有效手段,高压大容量DC/DC变换器是实现不同电压等级的直流电网线路之间互联的关键设备,也是制约直流电网推广的主要技术瓶颈之一。然而已发表的研究工作主要集中于DC/DC变换器在中低压小功率应用,其在高压大容量场合的应用研究较少。为此,首先分析了高压直流电网对大容量DC/DC变换器的技术需求,然后系统回顾了高压大容量高增益DC/DC变换器拓扑的国内外研究现状,并总结了各类DC/DC变换器的特点及其在未来高压直流电网中的应用前景。在此基础上指出了高压直流电网用的大容量DC/DC变换器亟待研究的关键问题。所述内容为未来高压直流电网技术的研究和工程化应用提供了一定的技术参考。 展开更多
关键词 高压直流电网 dc/dc变换器 模块化多电平换流器 可再生能源汇集 非隔离型 隔离型
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模块化多电平高压DC/DC变换器的电感参数设计 被引量:12
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作者 林智钦 王志冰 +4 位作者 杨晓峰 黄先进 郑琼林 李琰 姚良忠 《中国电机工程学报》 EI CSCD 北大核心 2016年第9期2470-2477,共8页
中高压大容量DC/DC变换器可以实现不同电压等级直流电网线路的互联,是直流电网中的关键设备之一。该文研究了基于隔离型MMC-DC/DC变换器的电感取值的计算方法和选取原则。通过建立基于交流电压源和电感串联等效电路的数学模型,研究了电... 中高压大容量DC/DC变换器可以实现不同电压等级直流电网线路的互联,是直流电网中的关键设备之一。该文研究了基于隔离型MMC-DC/DC变换器的电感取值的计算方法和选取原则。通过建立基于交流电压源和电感串联等效电路的数学模型,研究了电感大小对变换器运行特性的影响,进而提出综合考虑功率传输效率限制、交流电流谐波特性以及变压器容量和绝缘设计等因素的电感参数设计方法。最后采用PSCAD/EMTDC仿真软件对设计实例进行验证分析。仿真结果说明该文提出的电感参数设计方法的有效性,同时验证了该文关于电感大小对变换器电气量影响分析的正确性。 展开更多
关键词 直流电网 模块组合多电平变换器 dc/dc变换器 数学模型 参数设计
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模块化双向AC/DC变换器并联系统无缝切换控制 被引量:19
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作者 张犁 吴田进 +2 位作者 冯兰兰 孙凯 邢岩 《中国电机工程学报》 EI CSCD 北大核心 2012年第6期90-96,共7页
研究模块化双向AC/DC变换器并联运行系统,分析指出现有单模块双向运行控制方法引起各并联模块的功率流向不一致的问题;研究系统功率流与直流母线电压变化趋势的内在联系,提出一种模块化AC/DC变换器的双向运行控制方法,分别采用正向和负... 研究模块化双向AC/DC变换器并联运行系统,分析指出现有单模块双向运行控制方法引起各并联模块的功率流向不一致的问题;研究系统功率流与直流母线电压变化趋势的内在联系,提出一种模块化AC/DC变换器的双向运行控制方法,分别采用正向和负向电压调节器以保证各并联模块的功率流向一致;整流和逆变状态以不同的直流母线电压运行、自然区分两种功率流向。提出的控制方法可以实现各并联模块整流与逆变之间的无缝切换。详细分析系统稳定性,并指出多模块并联对系统动态特性有所改善;给出关键参数的设计准则。搭建实验验证系统,进行稳态和动态实验。实验结果证明了所提出控制方法的可行性和有效性。 展开更多
关键词 模块化变换器 双向变换器 并网逆变器 直流微网 无缝切换
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新型混合式高压直流输电DC/DC变换器 被引量:14
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作者 李彬彬 张书鑫 +2 位作者 程达 王卫 徐殿国 《电力系统自动化》 EI CSCD 北大核心 2018年第7期116-122,共7页
针对高压直流电网中现有DC/DC变换器拓扑在成本、效率方面的不足,提出了一种基于模块串联技术以及晶闸管、二极管串联技术的混合式DC/DC变换器拓扑,以实现高压直流电网中不同电压等级的互联。对该拓扑结构的工作原理、控制策略、元器件... 针对高压直流电网中现有DC/DC变换器拓扑在成本、效率方面的不足,提出了一种基于模块串联技术以及晶闸管、二极管串联技术的混合式DC/DC变换器拓扑,以实现高压直流电网中不同电压等级的互联。对该拓扑结构的工作原理、控制策略、元器件参数设计、经济性等方面进行了全面的分析论证。最后,在MATLAB中进行了仿真,验证了所提DC/DC变换器的可行性。 展开更多
关键词 高压直流输电 直流电网 dc/dc变换器 模块串联技术 模块化多电平换流器
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