Article(id=1152988937372033384, tenantId=1146029695717560320, journalId=1146119893612605453, issueId=1152988930656948403, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1705507200000, receivedDateStr=2024-01-18, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1752823584168, onlineDateStr=2025-07-18, pubDate=1739980800000, pubDateStr=2025-02-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1752823584168, onlineIssueDateStr=2025-07-18, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1752823584168, creator=13701087609, updateTime=1752823584168, updator=13701087609, issue=Issue{id=1152988930656948403, tenantId=1146029695717560320, journalId=1146119893612605453, year='2025', volume='43', issue='2', pageStart='143', pageEnd='284', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1752823582567, creator=13701087609, updateTime=1753694496025, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1156641806499570521, tenantId=1146029695717560320, journalId=1146119893612605453, issueId=1152988930656948403, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1156641806499570522, tenantId=1146029695717560320, journalId=1146119893612605453, issueId=1152988930656948403, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=252, endPage=259, ext={EN=ArticleExt(id=1152988937984401773, articleId=1152988937372033384, tenantId=1146029695717560320, journalId=1146119893612605453, language=EN, title=Frequency support technology of doubly-fed machine phase modulation system with fly-wheel energy storage based on virtual synchronization and speed limit, columnId=null, journalTitle=Renewable Energy Resources, columnName=null, runingTitle=null, highlight=null, articleAbstract=

When the doublyfed machine is connected to the grid, it can support or raise the frequency of the grid by compensating the active power, but the rotor speed decreases quickly and is not controllable, the time of active power compensation and frequency support is limited, and the stability of motor can not be guaranteed. This paper presents a frequency support technique for doublyfed machine (DFIG) phase modulation system with flywheel energy storage based on virtual synchronization control and dynamic speed limit. Firstly, the flywheel is hung on the rotor shaft of the doubly fed machine to increase the inertia of the system, and the mechanical energy storage, and delay the rotor speed decline rate in the process of frequency drop. Secondly, when the frequency of power grid drops, the realtime compensation of active power is carried out by means of virtual synchronization control strategy, and the compensation time of active power is regulated on demand based on the dynamic control of the lower speed limit of rotor. Finally, the validity of the proposed frequency support technology is verified by Matlab/Simulink simulating.

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电网频率跌落时,并网双馈电机向电网补偿有功功率,对电网频率具有一定的支撑或抬升作用,但频率跌落期间,双馈电机转子转速下降快且不可控、有功补偿及频率支撑的时长有限,无法保障双馈电机稳定运行。文章提出了一种基于虚拟同步和转速限制的飞轮储能双馈电机频率支撑技术,该技术首先在双馈电机转子转轴上外挂飞轮,增大了系统惯量、增加机械储能,延缓频率跌落过程中转子下降速率;其次,在电网频率跌落时,通过虚拟同步控制策略进行有功功率的实时补偿,基于转子转速下限值的动态控制,调控有功功率的补偿时间,配合飞轮储能实现有功补偿时长的优化控制;最后,在 Matlab/Simulink 中对调相系统频率支撑技术的有效性进行验证。

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姚芳(1972-),女,博士,教授,研究方向为新能源储能及智慧能源系统。E-mail:
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Zhangjiakou 075000 China), AuthorCompanyExt(id=1159145481382506624, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, companyId=1159145481369923710, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 国网冀北张家口风光储输新能源有限公司 河北 张家口 075000)]), AuthorCompany(id=1159145481437032577, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, xref=2, ext=[AuthorCompanyExt(id=1159145481441226882, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, companyId=1159145481437032577, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 School of Electrical Engineering, State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300401 China), AuthorCompanyExt(id=1159145481449615491, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, companyId=1159145481437032577, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 河北工业大学 电气工程学院 省部共建电工装备可靠性与智能化国家重点实验室 天津 300401)])], figs=[ArticleFig(id=1159145483399966888, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Fig. 1, caption=Stator and rotor windings and grid-connected equivalent circuit of doubly fed machine, figureFileSmall=8K2tqzW55q6RhAR1wSPJAA==, figureFileBig=lbN2a4PMfM/io1ge32twPA==, tableContent=null), ArticleFig(id=1159145483471270057, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=图 1, caption=双馈电机定、转子绕组及并网等效电路, figureFileSmall=8K2tqzW55q6RhAR1wSPJAA==, figureFileBig=lbN2a4PMfM/io1ge32twPA==, tableContent=null), ArticleFig(id=1159145483534184618, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Fig. 2, caption=Main circuit of doubly fed machine phase modulation system, figureFileSmall=hVNxmCx27uo1VhLOU5GzlQ==, figureFileBig=mi/6vV2lGZrVp5DfmP+SRg==, tableContent=null), ArticleFig(id=1159145483597099179, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=图 2, caption=双馈电机调相系统主回路, figureFileSmall=hVNxmCx27uo1VhLOU5GzlQ==, figureFileBig=mi/6vV2lGZrVp5DfmP+SRg==, tableContent=null), ArticleFig(id=1159145483660013740, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Fig. 3, caption=Frequency support strategy of doubly-fed machine with flywheel energy storage based on virtual synchronization and speed limit, figureFileSmall=ubSdCcW/xlEbQ3a2QxAf+Q==, figureFileBig=nR/3ueuhkkibZzKtEaXROQ==, tableContent=null), ArticleFig(id=1159145483727122605, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=图 3, caption=基于虚拟同步和转速限制的飞轮储能双馈电机频率支撑策略, figureFileSmall=ubSdCcW/xlEbQ3a2QxAf+Q==, figureFileBig=nR/3ueuhkkibZzKtEaXROQ==, tableContent=null), ArticleFig(id=1159145483773259950, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Fig. 4, caption=Dynamic characteristics of active power and rotor speed under ${0.2}\mathrm{\;{Hz}}$ frequency step drop condition, figureFileSmall=sAUTM44+afh1NrDPLwprBg==, figureFileBig=hd5qXKjSchEkvGGaqB7muQ==, tableContent=null), ArticleFig(id=1159145483865534639, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=图 4, caption=频率阶跃跌落 ${0.2}\mathrm{\;{Hz}}$ 工况下的有功功率与转子转速的动态特性, figureFileSmall=sAUTM44+afh1NrDPLwprBg==, figureFileBig=hd5qXKjSchEkvGGaqB7muQ==, tableContent=null), ArticleFig(id=1159145483915866288, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Fig. 5, caption=Dynamic characteristics of active power and rotor speed under the condition of grid frequency falling linearly to ${49.7}\mathrm{\;{Hz}}$ in $3 \sim 6$ seconds, figureFileSmall=2JiuIjQqjXMmXfVftsXJvg==, figureFileBig=OBfyWpuSrD8g6yZcSQHC7Q==, tableContent=null), ArticleFig(id=1159145483966197937, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=图 5, caption=电网频率 $3 \sim 6\mathrm{\;s}$ 内线性跌落至 ${49.7}\mathrm{\;{Hz}}$ 工况下的有功功率与转子转速的动态特性, figureFileSmall=2JiuIjQqjXMmXfVftsXJvg==, figureFileBig=OBfyWpuSrD8g6yZcSQHC7Q==, tableContent=null), ArticleFig(id=1159145484024918194, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Fig. 6, caption=Frequency support effect quantitative analysis on doubly fed machine phase modulation system with flywheel energy storage, figureFileSmall=LXuoO6KtQndJBHQqLS7PpQ==, figureFileBig=5PQ/VwJ3Qvwi61PpuvLVPw==, tableContent=null), ArticleFig(id=1159145484079444147, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=图 6, caption=飞轮储能双馈电机调相系统频率支撑效果的定量分析, figureFileSmall=LXuoO6KtQndJBHQqLS7PpQ==, figureFileBig=5PQ/VwJ3Qvwi61PpuvLVPw==, tableContent=null), ArticleFig(id=1159145484133970100, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Table 1, caption=Key parameters of main equipment of doubly fed machine phase modulation system, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值
额定电压/V 690
额定功率/MW 1.5
额定电流/A 2510
有飞轮惯性时间常数/s 6
最大电流/A 5000
机侧变流器额定电流/A 2800
网测变流器额定电流/A 840
), ArticleFig(id=1159145484209467573, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=表 1, caption=双馈电机调相系统主要设备的关键参数, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值
额定电压/V 690
额定功率/MW 1.5
额定电流/A 2510
有飞轮惯性时间常数/s 6
最大电流/A 5000
机侧变流器额定电流/A 2800
网测变流器额定电流/A 840
), ArticleFig(id=1159145484259799222, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=EN, label=Table 2, caption=Simulation parameters of frequency support strategy for flywheel energy storage DFIG phase modulation system, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值
虚拟惯量常数 ${D}_{1}$ 0.15
虚拟阻尼常数 ${D}_{2}$ 0.01
无飞轮系统惯性时间常数 $H/\mathrm{s}$ 2
有飞轮系统惯性时间常数 $H/\mathrm{s}$ 6
转子转速下限 ${\omega }_{\min }$ 0.4 ~0.9
比例系数 ${k}_{\mathrm{p}}$ 50
积分系数 ${k}_{\mathrm{i}}$ 100
有功补偿功率参考值 ${k}_{\text{peref }}$ -0.1
), ArticleFig(id=1159145484314325175, tenantId=1146029695717560320, journalId=1146119893612605453, articleId=1152988937372033384, language=CN, label=表 2, caption=飞轮储能双馈电机调相系统频率支撑策略的仿真参数, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值
虚拟惯量常数 ${D}_{1}$ 0.15
虚拟阻尼常数 ${D}_{2}$ 0.01
无飞轮系统惯性时间常数 $H/\mathrm{s}$ 2
有飞轮系统惯性时间常数 $H/\mathrm{s}$ 6
转子转速下限 ${\omega }_{\min }$ 0.4 ~0.9
比例系数 ${k}_{\mathrm{p}}$ 50
积分系数 ${k}_{\mathrm{i}}$ 100
有功补偿功率参考值 ${k}_{\text{peref }}$ -0.1
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基于虚拟同步和转速限制的飞轮储能双馈电机调相系统的频率支撑技术
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寇建 1 , 刘宏勇 1 , 于维耀 2 , 戴嘉庚 1 , 姚芳 2
可再生能源 | 2025,43(2): 252-259
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可再生能源 | 2025, 43(2): 252-259
基于虚拟同步和转速限制的飞轮储能双馈电机调相系统的频率支撑技术
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寇建1, 刘宏勇1, 于维耀2, 戴嘉庚1, 姚芳2
作者信息
  • 1 国网冀北张家口风光储输新能源有限公司 河北 张家口 075000
  • 2 河北工业大学 电气工程学院 省部共建电工装备可靠性与智能化国家重点实验室 天津 300401

通讯作者:

姚芳(1972-),女,博士,教授,研究方向为新能源储能及智慧能源系统。E-mail:
Frequency support technology of doubly-fed machine phase modulation system with fly-wheel energy storage based on virtual synchronization and speed limit
Jian Kou1, Hongyong Liu1, Weiyao Yu2, Jiageng Dai1, Fang Yao2
Affiliations
  • 1 State Grid Jibei Zhangjiakou Wind and Solar Energy Storage and Transportation New Energy Co., Ltd. Zhangjiakou 075000 China
  • 2 School of Electrical Engineering, State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300401 China
出版时间: 2025-02-20
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电网频率跌落时,并网双馈电机向电网补偿有功功率,对电网频率具有一定的支撑或抬升作用,但频率跌落期间,双馈电机转子转速下降快且不可控、有功补偿及频率支撑的时长有限,无法保障双馈电机稳定运行。文章提出了一种基于虚拟同步和转速限制的飞轮储能双馈电机频率支撑技术,该技术首先在双馈电机转子转轴上外挂飞轮,增大了系统惯量、增加机械储能,延缓频率跌落过程中转子下降速率;其次,在电网频率跌落时,通过虚拟同步控制策略进行有功功率的实时补偿,基于转子转速下限值的动态控制,调控有功功率的补偿时间,配合飞轮储能实现有功补偿时长的优化控制;最后,在 Matlab/Simulink 中对调相系统频率支撑技术的有效性进行验证。

双馈电机  /  频率跌落  /  有功补偿  /  飞轮储能  /  虚拟同步

When the doublyfed machine is connected to the grid, it can support or raise the frequency of the grid by compensating the active power, but the rotor speed decreases quickly and is not controllable, the time of active power compensation and frequency support is limited, and the stability of motor can not be guaranteed. This paper presents a frequency support technique for doublyfed machine (DFIG) phase modulation system with flywheel energy storage based on virtual synchronization control and dynamic speed limit. Firstly, the flywheel is hung on the rotor shaft of the doubly fed machine to increase the inertia of the system, and the mechanical energy storage, and delay the rotor speed decline rate in the process of frequency drop. Secondly, when the frequency of power grid drops, the realtime compensation of active power is carried out by means of virtual synchronization control strategy, and the compensation time of active power is regulated on demand based on the dynamic control of the lower speed limit of rotor. Finally, the validity of the proposed frequency support technology is verified by Matlab/Simulink simulating.

doubly fed electric machine  /  frequency drops  /  active compensation  /  flywheel energy storage  /  virtual synchronization
寇建, 刘宏勇, 于维耀, 戴嘉庚, 姚芳. 基于虚拟同步和转速限制的飞轮储能双馈电机调相系统的频率支撑技术. 可再生能源, 2025 , 43 (2) : 252 -259 .
Jian Kou, Hongyong Liu, Weiyao Yu, Jiageng Dai, Fang Yao. Frequency support technology of doubly-fed machine phase modulation system with fly-wheel energy storage based on virtual synchronization and speed limit[J]. Renewable Energy Resources, 2025 , 43 (2) : 252 -259 .
双馈电机采用有功、无功独立解耦控制策略调频调相,但减小了系统的等效惯量,还削弱了电网频率与转速之间的耦合关系, 导致并网双馈感应发电机(Doubly Fed Induction Generator, DFIG) 无法及时响应频率变化。大规模接入无调频能力的双馈风力发电机后, 电网的一次调频压力显著增加。因此, 研究 DFIG 高效灵活的有功补偿技术, 对提高一次电网调频能力具有重要的意义 [ 1 , 2 ]
目前,双馈电机的调频主要采用超速控制、 变桨控制、虚拟惯量控制和虚拟同步机(Virtual Synchronous Generator, VSG)控制策略。文献[ 3 ]采用与变桨控制结合的超速控制策略, 有效提高了系统的频率稳定性, 但并没有解决由于超速控制产生的经济性降低的问题。文献[ 4 ]提出双馈风机变减载率超速控制技术,既减少了超速控制成本,又抑制了微电网频率的动态偏差,但该控制技术不适用于高风速运行工况。文献[ 5 ]设计了双馈风机自适应变桨距控制技术, 使其在高风速运行时能维持基本稳定的输出功率, 但该技术要外接变桨距装置, 且控制较为复杂。文献[ 6 ]提出了一种永磁同步电机(Permanent Magnet Synchronous Motor, PMSG)的虚拟电容控制策略, 旨在提供更多的虚拟惯性, 并利用转子动能提供快速的功率支撑。文献[ 7 ]提出了基于选择函数的虚拟惯量综合控制技术,增加了系统的等效转动惯量, 改善了系统频率的动态响应特性, 但虚拟惯量控制下响应持续时间短, 且易发生频率的二次跌落。
VSG 控制响应速度快, 抑制频率变化能力强, 抗扰动能力强, 对电网调频具有更好的适应性 [ 8 , 9 ] ,但要配置储能单元。飞轮储能装置因其具备转换效率高、功率大、响应快、寿命长、维护简单、环境特性友好等特点, 能与电机出力形成有效互补关系, 并为系统提供额外的惯量支撑作用, 提高了双馈电机转子的可控性 [ 10 - 13 ] 。本文针对飞轮储能双馈电机调相系统, 提出了一种基于虚拟同步控制和转速下限值动态配置的有功补偿及频率支撑策略。通过虚拟同步控制实现调相机与电网的频率协调与有功补偿, 通过外挂飞轮和转速下限值动态配置, 对双馈电机转子转速下降的速率及有功补偿的时长进行优化控制, 确保双馈电机对电网的频率支撑的效果以及自身的稳定。
双馈电机定转子绕组星接, 定子绕组经升压变由耦合点接电网,转子绕组由集电环、电刷引出接变流器机侧,再接至升压变 690 V 低压侧,升压变${35}\mathrm{{kV}}$高压侧并网。双馈电极的定转子绕组、并网接线与并网等效电路如图 1 所示。
电网故障频率跌落时, 并网运行的双馈电机的电流、转速、有功功率变化会进入暂态过程,暂态过程依赖于电、磁、动力学耦合关系,主要涉及定、转子回路的 VCR 方程、电磁转矩方程和有功功率计算模型。
①静止坐标系下基于电压方程和磁链方程可推导出定、转子回路的 VCR 方程组为
$\left\{ \begin{array}{l} {u}_{\mathrm{s}} = \left( {{R}_{\mathrm{s}} + {L}_{\mathrm{s}}\frac{\mathrm{d}}{\mathrm{d}t}}\right) {i}_{\mathrm{s}} + {L}_{\mathrm{m}}\frac{\mathrm{d}}{\mathrm{d}t}{i}_{\mathrm{r}} \\ {u}_{\mathrm{r}} = - \mathrm{j}{\omega }_{\mathrm{r}}{L}_{\mathrm{m}}{i}_{\mathrm{s}} + \left( {{R}_{\mathrm{r}} + \mathrm{j}{\omega }_{\mathrm{r}}{L}_{\mathrm{r}} + {L}_{\mathrm{r}}\frac{\mathrm{d}}{\mathrm{d}t}}\right) {i}_{\mathrm{r}} \end{array}\right.$
式中:${u}_{\mathrm{s}},{u}_{\mathrm{r}}$分别为定、转子电压;${R}_{\mathrm{s}},{L}_{\mathrm{s}},{R}_{\mathrm{r}},{L}_{\mathrm{r}}$分别为定子侧与转子侧的电阻和电感参数;${L}_{\mathrm{m}}$为激磁电感;${\omega }_{\mathrm{r}}$为转子电角速度,即本文所述转子转速。
②电磁转矩等于转子轴上机械功率除以转子的机械角速度,用于支撑负载转矩和转子惯量。
${T}_{\mathrm{e}} = \frac{{P}_{\mathrm{m}}}{{\omega }_{\mathrm{r}}/{n}_{\mathrm{p}}} = \frac{J}{{n}_{\mathrm{p}}}\frac{\mathrm{d}{\omega }_{\mathrm{r}}}{\mathrm{d}t} + {T}_{\mathrm{L}}$
式中:${T}_{\mathrm{e}}$为电磁转矩;${P}_{\mathrm{m}}$为转子轴上输出的机械功率;${n}_{\mathrm{p}}$为电机的极对数;${\omega }_{\mathrm{r}}/{n}_{\mathrm{p}}$为转子机械角速度;$J$为转子惯量;${T}_{\mathrm{L}}$为负载转矩。
③双馈电机并网等效单相模型的有功功率为
$P = \frac{3{V}_{\mathrm{g}}{V}_{\mathrm{D}}}{2{X}_{\mathrm{g}}}\sin \left( {\theta - {\theta }_{\mathrm{g}}}\right)$
式中:${V}_{\mathrm{g}}$为电网电压;${V}_{\mathrm{D}}$为双馈电机并网点电压;${X}_{\mathrm{g}}$为电网的等效电阻与等效电抗;$\theta$${\theta }_{\mathrm{g}}$分别为双馈电机相位与电网相位。
④ 转子的机械能量${E}_{\mathrm{k}}$、电机惯量$H$方程分别为
${E}_{\mathrm{k}} = \frac{1}{2}J{\left( \frac{{\omega }_{\mathrm{r}}}{{n}_{\mathrm{p}}}\right) }^{2}$
$H = J\frac{{\left( 2\pi {f}_{\mathrm{n}}/{n}_{\mathrm{p}}\right) }^{2}}{2{S}_{\mathrm{n}}}$
式中:${S}_{\mathrm{n}}$为系统额定容量;${f}_{\mathrm{n}}$为额定频率;${n}_{\mathrm{p}}$为转子极对数。
⑤电机转子的运动方程为
$\frac{\mathrm{d}}{\mathrm{d}t}{\omega }_{\mathrm{r}}^{ * } = \frac{1}{2H}{T}_{\mathrm{e}}^{ * } - \frac{1}{2H}{T}_{\mathrm{L}}^{ * }$
式中:${\omega }_{\mathrm{r}}^{ * }$为转子转速标幺值;${T}_{\mathrm{e}}^{ * }$为电磁转矩标幺值;${T}_{\mathrm{L}}^{ * }$为负载转矩标幺值。
当电网电压跌落发生后,转矩失衡,电磁功率骤降, 为支撑电网频率应迅速释放转子动能, 转速在式(6)约束下振荡衰减。同时,定子磁链出现较大暂态分量,转子的高速旋转导致转差率的增大, 进而产生转子电压、电流增量, 严重时会损坏转子励磁变流器。因此,应对转速和电流进行稳定性控制, 以确保转速控制在转子可以承受的应力范围、 电流暂态冲击不超过变流器的限制。
在电网频率跌落时,${\theta }_{\mathrm{g}}$与电网频率成正比,故${\theta }_{\mathrm{g}}$减小,${X}_{\mathrm{g}}$也伴随频率减小,$P$增大。故双馈电机并网后当电网频率跌落时,会向电网补偿有功,进而实现频率支撑作用。但双馈电机转子储存的机械能量小、惯量$J$小,电机惯量$H$小,转速降低快, 双馈电机没有足够的时长向电网补充有功功率。
因此, 通过增加转子惯量、增大双馈电机的系统惯性时间常数,可以影响转子的运动方程,抑制转子的转速变化速率,延长有功补偿的时长 [ 14 - 16 ] ; 通过设置转子转速下限值作为有功补偿的终止条件, 可以适度控制双馈电机向电网释放机械能量的时长,起到灵活的电网频率支撑作用。
为提高双馈电机的频率支撑能力, 本文设计了基于飞轮储能的双馈电机调相系统,其主回路如图 2 所示。
由式 (6) 可知, 双馈电机外挂飞轮后, 系统惯量$H$增大,可以使转子的转速变化率降低,延长有功补偿时间,提高频率支撑能力。
为进一步提高双馈电机的频率支撑能力, 本文提出了基于转速约束与虚拟同步的双馈电机有功补偿控制策略,其核心关键为①利用虚拟同步技术,动态协同电机转子频率与电网频率,考虑虚拟同步角速度$\omega$的变化率和其与电网额定频率${\omega }_{\mathrm{n}}$的偏差对有功功率进行补偿和下垂控制; ②由于双馈电机变流器容量的影响, 双馈电机的转差率往往不大于 0.3,即转子转速${\omega }_{\mathrm{r}}$不低于${\omega }_{\min }$,通过设置转速下限值${\omega }_{\min }$,使双馈电机运行在合理的转速范围。
双馈电机的有功功率${P}_{\mathrm{e}}$受到电网等值电抗${X}_{\mathrm{g}}$和电机电网相位差$\delta$的影响,而${X}_{\mathrm{g}}$$\delta$取决于电网频率${\omega }_{\mathrm{g}}$:
$\left\{ \begin{array}{l} {P}_{\mathrm{e}} = \frac{3{V}_{\mathrm{g}}{V}_{\mathrm{D}}}{2{X}_{\mathrm{g}}}\sin \delta \\ \delta = \theta - {\theta }_{\mathrm{g}} \\ {\omega }_{\mathrm{g}} = {2\pi }{f}_{\mathrm{g}} = \frac{\mathrm{d}\theta }{\mathrm{d}t} \end{array}\right.$
由式 (7) 可知,电网频率${\omega }_{\mathrm{g}}$正常、双馈电机稳定运行时,$\theta < {\theta }_{\mathrm{g}},\delta < 0,{P}_{\mathrm{e}} < 0$,双馈电机向电网补偿负的有功功率。电网频率跌落后,转子转速降低、双馈电机向电网释放能量, 双馈电机向电网补偿正的有功功率。
当转子角速度大于下限值${\omega }_{\min }$时,双馈电机向电网发出的有功功率只受$\omega$${\omega }_{\mathrm{n}}$的差值影响。此时, 可充分发挥双馈电机的有功支撑作用, 参考功率${P}_{\text{eref }}$的标幺值设置为负的常数。当转子转速小于${\omega }_{\min }$时,通过对转子角速度进行的 PI 控制,将其尽快稳定在${\omega }_{\min }$,并停止有功补偿,恢复稳定的电动运行模式。
参考功率${P}_{\text{eref }}$
${P}_{\text{eref }} = \left\{ \begin{array}{l} {P}_{0},{\omega }_{\mathrm{r}} - {\omega }_{\min } > 0 \\ \left\lbrack {{k}_{\mathrm{p}}\left( {{\omega }_{\mathrm{r}} - {\omega }_{\min }}\right) + {k}_{\mathrm{i}}\int \left( {{\omega }_{\mathrm{r}} - {\omega }_{\min }}\right) \mathrm{d}t}\right\rbrack \end{array}\right.$
式中:${P}_{0}$为双馈电机在电网频率未变化时稳态的有功功率;${k}_{\mathrm{p}},{k}_{\mathrm{i}}$分别为 PI 控制环节的比例系数和积分系数。
根据感应电机的机械特性, 对电机进行虚拟同步控制, 控制方程为
$\left\{ \begin{array}{l} {D}_{1}\frac{\mathrm{d}\omega }{\mathrm{d}t} = {T}_{\text{eref }} - {T}_{\mathrm{e}} - {D}_{2}\left( {{\omega }_{\mathrm{r}} - {\omega }_{\mathrm{n}}}\right) \\ {T}_{\text{eref }} = \frac{{P}_{\text{eref }}}{{\omega }_{\mathrm{n}}} \\ {T}_{\mathrm{c}} = \frac{{P}_{\mathrm{c}}}{{\omega }_{\mathrm{n}}} \end{array}\right.$
式中:${\omega }_{\mathrm{n}}$为电网额定电角速度;${D}_{1}$为虚拟惯量常数;${D}_{2}$为虚拟阻尼常数;${T}_{\text{eref }}$为电磁转矩参考值。
由式 (8), (9) 可得有功功率的下垂控制方程:
${P}_{\mathrm{e}} = {P}_{\text{eref }} - {D}_{1}{\omega }_{\mathrm{n}}\frac{\mathrm{d}\omega }{\mathrm{d}t} - {\omega }_{\mathrm{n}}{D}_{2}\left( {{\omega }_{\mathrm{r}} - {\omega }_{\mathrm{n}}}\right)$
式中:${P}_{\mathrm{e}}$为双馈电机向电网补偿的有功功率,其数值的大小与${P}_{\text{erf }}$、虚拟同步转速$\omega$的变化率(虚拟惯量)和补偿量$- {\omega }_{\mathrm{n}}{D}_{2}\left( {{\omega }_{\mathrm{r}} - {\omega }_{\mathrm{n}}}\right)$有关,其中${\omega }_{\mathrm{n}}{D}_{2}$为有功下垂系数。
当电网频率跌落后,$\omega$随之降低,虚拟惯量$- {D}_{1}{\omega }_{\mathrm{n}}\mathrm{d}\omega /\mathrm{d}t$和补偿量$- {\omega }_{\mathrm{n}}{D}_{2}\left( {{\omega }_{\mathrm{r}} - {\omega }_{\mathrm{n}}}\right)$均为正值,二者叠加到${P}_{\text{eref }}$,具有有功功率的补偿作用。
本文提出了基于转速约束与虚拟同步的双馈电机有功补偿控制策略, 用于基于飞轮储能的双馈电机调相系统,构建出基于飞轮储能和转速动态约束的频率支撑策略,如图 3 所示。
在电网频率跌落后, 双馈电机通过虚拟同步控制模块控制转子侧变流器对电网进行有功补偿,飞轮的存在也提高了双馈电机的有功补偿能力。当双馈电机转子转速未达下限值时, 不对转速进行控制,此时转速自然跌落;当双馈电机转子转速低于下限值时,对转子转速进行$\mathrm{{PI}}$控制,防止转速继续跌落。
双馈电机可并网补偿有功功率,起到支撑或抬升电网频率的正常或紧急调控作用。双馈电机对电网频率的支撑作用体现为其作为 “源” 向电网提供电能的模式, 该模式主要取决于所补偿的有功功率的数值和时长。故为验证所提出的双馈电机频率支撑技术的效果, 本文考虑典型电网频率跌落工况, 仿真研究双馈电机频率支撑过程的有功功率和时间长度。
为验证本文所提出的双馈电机频率支撑技术的有效性, 根据图 2,3 在 Matlab/Simulink 环境下搭建了双馈电机的电力系统仿真模型。为统一单位等级,减少多个不同单位等级之间计算对单位的折算次数,将系统设置为标幺化系统。
双馈电机系统仿真模型中, 双馈电机、变流器等主要设备的关键参数如表 1 所示。
双馈电机系统仿真模型中, 虚拟同步控制模块的惯量常数${D}_{1}$和阻尼常数${D}_{2}$、参考功率计算模型中的模型比例系数${k}_{\mathrm{p}}$、积分系数${k}_{\mathrm{i}}$和有功补偿功率的参考值${k}_{\text{peref }}$、系统惯性时间常数$H$、转子转速额定值${\omega }_{\text{ref }}$和转子转速下限值${\omega }_{\min }$配置如表 2 所示。
根据国家相关规定:装机容量在 300 万 kW 及以上的电力系统,正常状况下供电频率的允许偏差为$\pm {0.2}\mathrm{\;{Hz}}$,即${49.8} \sim {50.2}\mathrm{\;{Hz}}$,对电网频率进行正常调控。正常调控主要由并网运行的各发电机组对电网进行有功补偿, 随后由电网指定的大型发电机将电网频率抬升。如果电网频率偏移值大于${0.2}\mathrm{\;{Hz}}$,要对电网进行紧急调控。紧急调控状态下, 通过改变发电计划、电网调度及切除负荷等手段,快速将频率调回正常频率范围。为此,本文设计两类频率跌落工况:①频率阶跃跌落,电网频率在第 3 秒时由${50}\mathrm{\;{Hz}}$跌落至${49.8}\mathrm{\;{Hz}}$;② 频率连续跌落工况,电网频率在$3 \sim 6\mathrm{\;s}$${50}\mathrm{\;{Hz}}$线性跌落至${49.7}\mathrm{\;{Hz}}$。双馈电机外挂飞轮可增大系统的惯性时间常数$H$、减小转子转速下降速率。本文仿真模型根据实际${1.5}\mathrm{{MW}}$双馈电机调相系统构建,无、 有飞轮时的$H$分别为$2\mathrm{\;s}$$6\mathrm{\;s}$。双馈电机转子转速下限值可以在 0.4~0.9 p.u.调整,根据频率支撑对有功补偿的时长需求进行动态配置。
在有、无外挂飞轮两种情况下, 转子转速下限值分别为${0.5}\mathrm{p}.\mathrm{u}$. 和${0.7}\mathrm{p}.\mathrm{u}$的两种补偿时长控制下,有功功率和转子转速的仿真结果如图 4,55 所示。
图 4,5 可知: ①频率阶跃跌落时, 转子角速度线性下降,有功功率跳升至峰值平台,且其峰值与转速限值无关、与频率跌幅有关;频率线性跌落时, 转子角速度抛物状下降, 有功功率线性增大, 其峰值与转速限值无关、与频率跌落终值有关;② 转速限值为 0.5 p.u.时, 有功补偿的时间长; 转速限值为 0.7 p.u.时, 有功补偿的时间短, 即有功补偿的时长与转速限制直接相关;转速下限值分别为${0.5},{0.7}\mathrm{p}.\mathrm{u}$.时,外挂飞轮可分别延长有功功率补偿时间分别为${6.9},{3.5}\mathrm{\;s}$,故外挂飞轮可显著延长有功功率补偿的时长;③双馈电机转速到达设定的下限值后, 进入 PI 控制环节, 此时双馈电机的有功曲线与转速曲线会出现短时间的振荡, 而飞轮抑制了有功曲线与转速曲线的振荡幅度与振荡时长, 使得双馈电机应对频率跌落时有更高的稳定性与可控性。
为研究电网频率跌落对转子转速变化率、电网频率跌落对有功补偿值和转速下限值对有功补偿时长的影响,在频率阶跃跌落和连续跌落多种工况下, 仿真获取有功功率和转子转速曲线, 获取转速变化率、补偿时长和有功功率峰值,结果如图 6 所示。
图 6 可知:转速变化率、有功补偿值均与电网频率的跌落幅值呈正比例关系,有功补偿时长随转速下限值的增大而线性缩短;飞轮外挂对于有功补偿值几乎没有影响, 但可降低转速变化率、 延长有功补偿时间。因此, 根据转速变化率-频率跌落幅值、有功补偿值-频率跌落幅值的线性关系和有功补偿时间-转速下限值关系,可通过改变转速下限值,动态改变有功补偿时长,动态掌控调相机的频率支撑过程,助力实现灵活的频率的有功支撑。
本文提出了飞轮储能与转速控制的有功补偿-频率支撑技术,并搭建了 Matlab/Simulink 系统仿真模型,仿真结果表明:
①对双馈电机进行虚拟同步控制、转速 PI 控制及转速下限值动态控制, 可在实现电网频率跌落时有功功率补偿的同时, 确保转子转速跌落至下限值后能快速稳定到该值附近;
②通过外挂飞轮增大电机系统惯性时间常数, 可使双馈电机应对电网频率跌落时具有更低的转子转速跌落速率,可明显延长有功补偿时间;
③转速变化率和有功补偿值与电网频率跌落幅值呈正比,有功补偿时长随转速下限值的减小线性增大, 双馈电机外挂飞轮, 并配合转速下限值的动态控制, 可进行动态有功补偿, 实现灵活的一次调频。
  • 河北省自然科学基金资助项目(E2022202056)
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  • 接收时间:2024-01-18
  • 首发时间:2025-07-18
  • 出版时间:2025-02-20
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  • 收稿日期:2024-01-18
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河北省自然科学基金资助项目(E2022202056)
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    1 国网冀北张家口风光储输新能源有限公司 河北 张家口 075000
    2 河北工业大学 电气工程学院 省部共建电工装备可靠性与智能化国家重点实验室 天津 300401

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姚芳(1972-),女,博士,教授,研究方向为新能源储能及智慧能源系统。E-mail:
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
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