Article(id=1215701011713409932, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215701006780908352, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202404073, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1713715200000, receivedDateStr=2024-04-22, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1767775307825, onlineDateStr=2026-01-07, pubDate=1724515200000, pubDateStr=2024-08-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1767775307825, onlineIssueDateStr=2026-01-07, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1767775307825, creator=13701087609, updateTime=1767775307825, updator=13701087609, issue=Issue{id=1215701006780908352, tenantId=1146029695717560320, journalId=1210938733613449225, year='2024', volume='53', issue='8', pageStart='1', pageEnd='162', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1767775306649, creator=13701087609, updateTime=1767839655334, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1215970904794906790, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215701006780908352, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1215970904794906791, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215701006780908352, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=94, endPage=104, ext={EN=ArticleExt(id=1215701011977651098, articleId=1215701011713409932, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Research on pre-synchronization control strategy of grid-forming converter based on improved LADRC, columnId=1215701007804322379, journalTitle=Thermal Power Generation, columnName=Operation control technology of grid-forming energy storage technology, runingTitle=null, highlight=null, articleAbstract=

To address the problem of grid connection failure caused by low frequency and voltage stability in power system during pre-synchronization process of grid-forming converters, a pre-synchronization control strategy for grid-forming converters based on improved linear active disturbance rejection control (LADRC) is proposed. Firstly, the phase locked loop (PLL) control strategy is used to synchronize the phase and amplitude of the grid voltage with the feedback control of phase deviation, which can avoid the stability problems caused by low precision of the PLL and the slow response speed. On this basis, introducing LADRC in angular frequency output of the active frequency branch module can effectively suppress the frequency oscillation of the system, so as to ensure the normal pre-synchronization process of the grid-forming converter and realize successful grid-connection. Finally, on the MATLAB/Simulink simulation platform, a pre-synchronization control model for grid-forming converters based on improved LADRC is established verified through simulation. The results show that, the proposed strategy can effectively suppress the system frequency oscillations and accelerate the pre-synchronization process of the system, ensuring safe operation of the grid-forming converter and ultimately achieving successful grid connection. The simulation results verify the effectiveness of the proposed method.

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针对构网型变换器预同步过程时电力系统频率电压稳定性低导致变换器并网失败的问题,提出一种基于改进线性自抗扰控制(LADRC)的构网型变换器预同步控制策略。首先,采用无锁相环(PLL)控制策略,通过相位偏差的反馈控制对网侧电压的相位和幅值进行快速同步追踪,可避免因PLL精度较低和响应速度慢而引起的电力系统稳定性降低的问题。在此基础上,在有功频率支路模块的角频率输出端引入LADRC,这可以有效解决预同步控制过程中变换器输出电压频率存在过冲的问题,从而确保构网型变换器预同步控制顺利进行最终实现成功并网。最后,在MATLAB/Simulink仿真平台中搭建基于改进LADRC的构网型变换器预同步控制模型并进行仿真验证,结果表明所提控制策略可以有效抑制系统频率震荡,并能够加速系统预同步进程,确保构网型变换器安全运行最终实现成功并网,仿真结果验证了所提方法的有效性。

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刘辉(1975),男,博士,教授级高级工程师,主要研究方向为新能源并网技术,
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吴林林(1986),男,硕士,高级工程师,主要研究方向为新能源并网技术,

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Simulation parameters of the system

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参数数值
功频增益系数kp0.1
无功电压增益系数kq0.75
电力系统额定角频率ωn/(rad·s–1)2×π×50
滤波电感Lf/mH370
滤波电容Cf/μF0.1
有功频率环节反馈系数kω0.15
无功电压支路调压系数ke10
观测器带宽ω03
虚拟惯量J/(kg·m2)6
阻尼系数D/(N·m·s·rad–1)284.5
控制器带宽ωc15
网侧电压Uabc/V380
), ArticleFig(id=1215701024594117018, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215701011713409932, language=CN, label=表1, caption=

系统仿真参数

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参数数值
功频增益系数kp0.1
无功电压增益系数kq0.75
电力系统额定角频率ωn/(rad·s–1)2×π×50
滤波电感Lf/mH370
滤波电容Cf/μF0.1
有功频率环节反馈系数kω0.15
无功电压支路调压系数ke10
观测器带宽ω03
虚拟惯量J/(kg·m2)6
阻尼系数D/(N·m·s·rad–1)284.5
控制器带宽ωc15
网侧电压Uabc/V380
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基于改进LADRC的构网型变换器预同步控制策略研究
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吴林林 , 刘辉 , 黄贤淼 , 邵尹池 , 赵洋 , 朱学森
热力发电 | 构网型储能运行控制技术研究 2024,53(8): 94-104
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热力发电 | 构网型储能运行控制技术研究 2024, 53(8): 94-104
基于改进LADRC的构网型变换器预同步控制策略研究
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吴林林 , 刘辉 , 黄贤淼, 邵尹池, 赵洋, 朱学森
作者信息
  • 国网冀北电力科学研究院(华北电力科学研究院有限责任公司),北京 100045
  • 吴林林(1986),男,硕士,高级工程师,主要研究方向为新能源并网技术,

通讯作者:

刘辉(1975),男,博士,教授级高级工程师,主要研究方向为新能源并网技术,
Research on pre-synchronization control strategy of grid-forming converter based on improved LADRC
Linlin WU , Hui LIU , Xianmiao HUANG, Yinchi SHAO, Yang ZHAO, Xuesen ZHU
Affiliations
  • State Grid Jibei Electric Power Research Institute (North China Electric Power Research Institute Co, Ltd), Beijing 100045, China
出版时间: 2024-08-25 doi: 10.19666/j.rlfd.202404073
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针对构网型变换器预同步过程时电力系统频率电压稳定性低导致变换器并网失败的问题,提出一种基于改进线性自抗扰控制(LADRC)的构网型变换器预同步控制策略。首先,采用无锁相环(PLL)控制策略,通过相位偏差的反馈控制对网侧电压的相位和幅值进行快速同步追踪,可避免因PLL精度较低和响应速度慢而引起的电力系统稳定性降低的问题。在此基础上,在有功频率支路模块的角频率输出端引入LADRC,这可以有效解决预同步控制过程中变换器输出电压频率存在过冲的问题,从而确保构网型变换器预同步控制顺利进行最终实现成功并网。最后,在MATLAB/Simulink仿真平台中搭建基于改进LADRC的构网型变换器预同步控制模型并进行仿真验证,结果表明所提控制策略可以有效抑制系统频率震荡,并能够加速系统预同步进程,确保构网型变换器安全运行最终实现成功并网,仿真结果验证了所提方法的有效性。

构网型变换器  /  预同步控制  /  自抗扰控制  /  无锁相环控制  /  有功频率支路

To address the problem of grid connection failure caused by low frequency and voltage stability in power system during pre-synchronization process of grid-forming converters, a pre-synchronization control strategy for grid-forming converters based on improved linear active disturbance rejection control (LADRC) is proposed. Firstly, the phase locked loop (PLL) control strategy is used to synchronize the phase and amplitude of the grid voltage with the feedback control of phase deviation, which can avoid the stability problems caused by low precision of the PLL and the slow response speed. On this basis, introducing LADRC in angular frequency output of the active frequency branch module can effectively suppress the frequency oscillation of the system, so as to ensure the normal pre-synchronization process of the grid-forming converter and realize successful grid-connection. Finally, on the MATLAB/Simulink simulation platform, a pre-synchronization control model for grid-forming converters based on improved LADRC is established verified through simulation. The results show that, the proposed strategy can effectively suppress the system frequency oscillations and accelerate the pre-synchronization process of the system, ensuring safe operation of the grid-forming converter and ultimately achieving successful grid connection. The simulation results verify the effectiveness of the proposed method.

grid-forming converter  /  pre-synchronization control  /  active disturbance rejection control  /  no phase locked loop control  /  active frequency branch
吴林林, 刘辉, 黄贤淼, 邵尹池, 赵洋, 朱学森. 基于改进LADRC的构网型变换器预同步控制策略研究. 热力发电, 2024 , 53 (8) : 94 -104 . DOI: 10.19666/j.rlfd.202404073
Linlin WU, Hui LIU, Xianmiao HUANG, Yinchi SHAO, Yang ZHAO, Xuesen ZHU. Research on pre-synchronization control strategy of grid-forming converter based on improved LADRC[J]. Thermal Power Generation, 2024 , 53 (8) : 94 -104 . DOI: 10.19666/j.rlfd.202404073
随着能源与环境问题加剧,分布式发电技术得到了广泛关注。分布式电源经过传统的变换器变换之后接入电网,而传统变换器控制策略无法为电网提供足够的阻尼和惯性,不能为电网电压和频率提供足够的支撑[1-6]。同时,变换器系统根据电网的运行需要和故障情况变化会存在离网和并网2种运行状态,变换器需要在这两种运行状态之间灵活切换,因此,如何将变换器系统从离网状态平滑地切换到并网状态并进行预同步控制,且不对电网产生剧烈的冲击和波动、保证系统的安全稳定运行是当前研究的关键,也是目前的研究热点之一。因此,有学者提出了构网型变换器控制技术,通过模拟同步发电机运行特性,引入惯量和阻尼环节,这使得系统运行的稳定性得到了有效提升[7-10]。目前,构网型变换器控制策略主要分为下垂控制、匹配控制、虚拟振荡器控制和虚拟同步机控制(virtual synchronous generator,VSG)4种[11-14],其中以虚拟同步机技术为基础的控制策略研究最为广泛。
为提高构网型变换器预同步控制过程的动稳态性能,简化预同步控制算法并加速预同步控制进程,文献[15]有效提升锁相环精度,通过同步锁相环滤除网侧采集电压谐波,获取无谐波网侧的电压及其相位,但其忽略了预同步过程中的频率波动问题;文献[16]提出一种无无锁相环(phase locked loop,PLL)的预同步并网控制策略,在αβ坐标系下推导出构网型变换器输出电压和网侧电压相角差sinΔθ的表达式,通过PI调节器接入P-f控制模块,减少了采用PLL的个数,但是在预同步过程中存在频率波动幅度较大的问题,这会对系统的稳定性产生不利影响;文献[17]在构网型变换器和电网之间引入虚拟阻抗,将构网型变换器和网侧之间传输的虚拟功率作为变换器频率的反馈,减小它们之间的相位偏差,但该方法没有考虑本地负载,只是通过PI控制模块来调节构网型变换器的频率,预同步过程结束运行时系统将经历一个不稳定的动态过程;文献[18]采用虚拟功率控制策略,通过调节改变虚拟阻抗处的无功功率来控制两侧电压快速同步,此控制策略能有效避免采用锁相环的复杂动作流程,但在调节控制每相虚拟无功时存在计算量较大与操作过程十分繁杂的问题。以上文献提出的控制策略都通过减少PLL的复杂操作流程来提高构网型变换器预同步控制的准确度和速度,但都未考虑控制过程中变换器输出电压频率存在过冲的问题,严重时可能造成变换器损坏,系统稳定性下降,最终导致并网失败[19-22]
综上所述,为有效解决系统预同步控制过程中频率电压过冲的问题,本文在采用无锁相环控制的基础上,将在有功频率控制支路的角频率输出端引入线性自抗扰控制(linear active disturbance rejection control,LADRC),提出一种改进LADRC的构网型变换器并网预同步控制策略。该策略首先利用构网型变换器可自动生成参考相位的特点,基于相角补偿对网侧电压的相位和幅值进行同步追踪,然后从有功频率控制结构角度进行研究,通过引入自抗扰控制器加速控制角频率变化,可以有效减小功率冲击,从而达到安全并网的效果。该策略可以简化预同步并网控制过程,还可以避免因锁相环精度和响应速度的影响而引起电力系统的稳定性问题,有效增强了对频率电压的控制效果,保证系统的离/并网平滑快速切换。最后利用MATLAB/Simulink搭建基于改进LADRC的构网型变换器控制策略的预同步控制系统,验证了所提方法的有效性。
本文搭建构网型变换器控制结构模型和控制原理图如图1所示。
图1可见,该控制结构是由以典型VSG控制构成的功率外环和以电压电流双闭环构成的内环共同组成。图1中:Udc为直流电源处电压;Cdc为直流电源稳压电容;ωn为电力系统额定角频率;ω为构网型变换器的输出角频率;Uabc为网侧电压;UaUbUc分别为滤波后负荷集中的输出电压;UdUq分别为双闭环控制环节的dq轴输出分量;iabc为经过电感滤波后的电流;QrefPref分别为构网型变换器系统有功功率、无功功率设定值;LfCf分别为变换器侧的滤波电感、电容;PeQe分别为从PCC采集电压电流参数信息计算得出后经过低通滤波输出的有功、无功功率;U为构网型变换器的输出电压;U0为系统额定电压。
所搭建构网型变换器的基本控制结构包括有功频率控制环节、无功电压控制环节和同步发电机的电磁模型。VSG控制通过模拟同步发电机转子运动方程,相比下垂控制能够更为精确的模拟虚拟同步机运行特性。虚拟同步机转子运动二阶方程为:
{Jdωdt=TmTeD(ωωn)PmωnPeωnD(ωωn)Pm=Pref+kω(ωωn)kedEdt=(QrefQ)+kq(U0U)dθdt=ωωn
式中:J为构网型变换器转动惯量;TmTe分别为机械转矩与电磁转矩;D为构网型变换器阻尼系数;Pm为机械功率;kω为有功频率环节反馈系数;θ为VSG参考电压相角;E为构网型变换器内电势幅值;Q为构网型变换器实际输出无功功率;kq为无功电压增益系数;ke为无功电压支路调压参数。
为了解决构网型变换器系统在复杂运行工况下进行预同步时频率电压过冲程度的问题,同时满足系统应该具备优良的动态响应特性,本文提出基于改进型LADRC的构网型变换器预同步控制策略,控制策略原理如图2所示。
所提基于改进型LADRC的构网型变换器预同步控制策略相较于传统变换器预同步控制,可以更有效地降低电网波动和负荷需求变化等的干扰影响程度,避免由于锁相环繁杂操作带来的误差,同时能够给电力系统提供惯性支撑,使得控制系统响应速度更快,可以根据给定功率进行能量快速分配,起到提高调频质量以及确保电网在极端运行条件下安全稳定运行的作用。
传统的预同步控制方法是利用PLL提取变换器输出电压和电网电压的幅值和相位信息,通过PI控制器分别将电压差和相角差接入Q-U控制器和P-f控制器中,实现离网到并网的无缝切换。但是传统预同步需要锁相环不断地将网侧和变换器侧电压相位进行比较、控制,存在过度调节的情况,且本身存在非线性、响应慢、参数设计难等问题,因此引入过多的锁相环可能会影响系统预同步的速度和精度。
为使变换器可以平滑地进行并离网切换,提出一种基于无PLL相角补偿的预同步控制策略,该策略使变换器输出的三相电压无差地对网侧电压幅值、频率和相位进行追踪,可以减小并网瞬间系统产生的冲击电压和电流,并且能加速预同步进程,最终确保系统安全稳定运行实现成功并网,具体预同步控制向量如图3所示。在构网型变换器模型中,针对滤波环节造成的相位偏移在变换器的调制波相位上引入补偿相位θb进行补偿。以构网型变换器输出电压相位为输入,对网侧电压进行坐标变换,此时虚拟同步发电机电压与d轴重合,q轴分量为0。然后,通过调整构网型变换器的输出电压角速度ω,实现对dq坐标系旋转角速度的控制,最后实现电压幅值、频率、相位的同步控制。
图3中,Ua为构网型变换器输出的a相电压;UabcdUabcq分别为网侧电压在d轴和q轴的分量;θabc为网侧电压相位;θ为构网型变换器输出电压的相位。构网型变换器输出电压超前电网电压相位值:
sinΔθ=UabcqUabcq2+Uabcd2
通过将参数sinΔθ输入比例积分控制环节进行控制,得出的调节量ω*补偿反馈给构网型变换器的有功频率支路角频率输出端,可以实现相位、频率同步。对网侧电压Uabc和构网型变换器的输出电压U进行abc/dq坐标变换得出:
[UabcdUabcq]T=Tdq/abc[UaUbUc]T
[UdUq]T=Tdq/abc[UaUbUc]T
Tdq/abc=23[sinθ     sin(θ120°)     sin(θ+120°)cosθ     cos(θ120°)    cos(θ+120°)]
当经过相位频率预同步环节调节后,构网型变换器输出电压与电网电压相位同步,即θθabc,此时d轴分量Uabcd为电网电压幅值。将Uabcd-Ud输入比例积分控制环节进行控制,再经过滤波环节后将得到的U*信号补偿给构网型变换器的额定电压,完成对构网型变换器输出电压幅值的预同步过程调节。最后,在构网型变换器系统捕捉到并网信号后,启动相位预同步控制,在网侧电压和构网型变换器输出电压重合时,满足θabcq=0、θθabc,完成系统的预同步控制过程。
虽然无PLL预同步控制可以避免因为锁相环的锁相精度导致电压相位和幅值存在偏差,以及锁相操作繁杂带来的不利影响,但是预同步过程中存在电压过冲问题以及同步速度往往还是不能满足实际需求,因此本文在有功频率支路角频率输出端引入自抗扰控制器,在无功电压支路引入PI控制器,可以有效抑制系统频率电压震荡,从而加速系统与电网频率电压整体同步速度。
自抗扰控制器主要由跟踪微分器、线性扩展状态观测器(linear expansion state observer,LESO)和线性状态误差反馈(linear state error feedback,LSEF)3个部分组成,具体结构及原理如图4所示。
图4中:v为输入参考信号;v1v2为目标跟踪信号;y为被控对象输出量;Z1Z2Z3分别为系统输出的观测值、输出微分的观测值和系统总扰动的观测值;b0为系统总扰动的补偿系数;u为补偿后的控制信号;β1β2β3均为观测器增益;e为系统跟踪误差;f为系统内外总扰动;ab分别为微分方程y的系数,相关计算公式如下:
y¨=ay˙by+(bb0)u+b0u=f(y,y˙,ω,t)+b0u
扩张状态观测器为:
{e=yz1z˙1=z2+β1ez˙2=z3+β2e+b0uz˙3=β3e
将式(7)状态方程进行Laplace变换得出:
Z(s)=1s3+β1s2+β2s+β3×[b0s                   β1s2+β2s+β3b0s2+b0β1s          β2s2+β3sb0β3                            β3s2][U(s)V(s)]
式中:Z(s)为系统观测矩阵;U(s)为将补偿后的控制信号u进行Laplace变换后得到的函数;V(s)为将输入信号v进行Laplace变换后得到的函数。根据状态观测及状态方程可以得到LSEF原理,即为:
u=kp(vz1)kdz2fz3b0=z3f+u0b0
U(s)=1b0[kpR(s)C(s)V(s)H(s)C(s)]
V(s)R(s)=kps2+kds+kp
C(s)=s3+β1s2+β2s+β3s3+(β1+kd)s2+(β1kd+β2+kp)s
H(s)=(kpβ1+kdβ2+β3)s2+(kpβ2+kdβ3)s+kpβ3s3+β1s2+β2s+β3
最后根据式(9)—式(13)和图4可以推导出线性自抗扰控制系统闭环传递函数:
L(s)=s3+β1s2+β2s1+β3s5+a1s4+a2s3+a3s2+a4s+kpβ3
式中:α1=β1+kdα2=kdβ1+β2+kpα3=kdβ2+kpβ1+β3α4=kpβ2+kpβ3
结合LADRC结构及原理框图,将构网型变换器系统中的P-f环节作为主控对象,将角频率作为输入信号;线性状态误差反馈模块通过对输出信号的观测而反馈补偿被控变量,使输入信号被输出信号及时跟踪。图5为LADRC系统伯德图。图5中,ω0ωc分别为LADRC中观测器带宽、控制器带宽。为了更加了解ω0ωc对LADRC控制性能的影响,将参数ωc设置为10,将ω0从0.1到10取值得到LADRC系统伯德图5a)。由图5a)可见,随着观测器带宽取值的增大,系统对高频信号抑制能力先降低后逐渐提高。ω0取值较小时,系统在低频段存在干扰抑制能力和相位裕度剧烈变动的情况,这会对电力系统安全稳定运行产生不利影响;ω0取值在中间时,系统在中频段干扰抑制能力和相位裕度都有一定降低,但是系统在高频段稳定性提高;ω0取值较大时,系统对干扰信号的抑制响应推迟,相位裕度在高频段有所下降。通过比较伯德图参数结果得出,在ω0取值为3左右时性能较好,能同时满足干扰抑制和相位裕度的条件。将参数ω0设置为3,将ωc从3到15进行取值得到LADRC系统伯德图5b),由图5b)可见,随着ωc的增大,系统的抗干扰性能逐渐提升,在中频段附近相位裕度有了明显的提高,系统抵御外界干扰能力有所增强,与此同时,ωc增大对低频处的扰动也有了更好地抑制效果。综上所述,同时考虑LADRC中ωcω0参数关系,选择ωc=15,ω0=3。
为验证所提基于改进型LADRC的构网型变换器预同步控制策略的有效性,结合前面所提模型在Simulink平台中搭建构网型变换器并/离网预同步控制系统模型,表1中数据为文章所搭建构网型变换器预同步仿真模型参数。
设定系统运行在0.30 s时突增4 kW的有功负载,0.50 s时给出启动预同步信号,系统预同步仿真总时长为1.00 s,电压同步波形如图6所示。图6a)波形为处于传统预同步控制策略下的变换器输出电压与电网电压的比较,图6b)波形为处于基于改进LADRC的构网型变换器控制策略下的变换器输出电压与电网电压的比较。图7为负荷突增工况下电压系统频率、电压和功率波形。从图6图7可以看出,传统预同步控制系统中,若采用传统构网型变换器控制策略,逆变侧电压和网侧电压的电压差较大且将保持较长时间。
采用基于改进LADRC的构网型变换器预同步控制策略下时,系统在0.50 s时就已经达到并网要求,相较于采用传统预同步策略时提前0.10 s达到并网要求。当系统负载在0.30 s时突增4 kW,由于传统控制策略不能实现频率的无差调节,因此系统的输出频率从50.18 Hz迅速降至49.97 Hz,这种现象将对系统中电子元件的安全产生不利影响,而采用基于改进LADRC的构网型变换器预同步控制策略时,系统频率会出现较小的波动但不存在频率迅速上升或者下降的情况。
同时从图7电压波形可以看出,采用传统预同步控制策略时,从0.50 s给出并网信号到满足并网要求时间段内变换器输出电压存在高频剧烈波动,并且在0.60 s时频率会产生较大的增加|Δfmax|=0.178 Hz,这对电力系统正常运行不利,采用本文提出的基于改进LADRC的构网型变换器预同步控制策略时变换器输出电压波动较小,在0.50 s并网时|Δfmax|=0.107 Hz。
综上所示,采用本文提出的基于改进LADRC的构网型变换器预同步控制策略时能够加速系统预同步速度,同时可以有效抑制系统电压频率波动,提高系统电能质量。
考虑到电网中极端运行工况,在0.30 s时电网电压相位突增15 deg.,0.50 s时给出启动预同步信号,系统预同步仿真总时长为1.00 s,电压同步波形以及系统频率、电压和功率波形分别如图8图9所示。
在传统预同步控制下,由于不能提供足够相位补偿以及不能快速抑制干扰信号对系统的影响,系统在预同步过程中,电网电压和变换器输出电压始终存在较大电压差,在0.50 s时系统频率会迅速升高至50.25 Hz以上,这会直接导致电力系统崩溃甚至造成严重停电事故。采用基于改进LADRC的构网型变换器控制策略时,变换器输出电压会得到相位补偿,因此电网电压和变换器输出电压间的电压差会快速降低。
采用基于改进LADRC的构网型变换器控制策略时,系统电压频率的稳定性最好。由图9从0.50 s之后定量指标可见,采用改进型LADRC策略时|Δfmax|=0.023 Hz,相比于采用传统LADRC策略|Δfmax|=0.33 Hz评价指标降低了93.03%。说明在电网电压相位突变的极端运行工况下,采用改进型LADRC策略能提供足够的系统惯量支撑,能有效抑制外界扰动对系统稳定性带来的不利影响,同时通过迅速改变提升有功出力,降低系统频率下降幅度和速率,加速系统预同步进程。
考虑到电网中电压的不稳定性,在0.30 s时电网电压由0.2p.u.突增为0.8p.u.,后在0.35 s时由0.2p.u.突降为1.0p.u.,0.50 s时给出启动预同步信号,系统预同步仿真总时长为1.00 s,电网电压突变工况下电压同步波形及系统频率、电压和功率出力波形如图10图11所示。
图10可见,在电网电压突变工况下,0.30 s和0.35 s时电压突增0.2p.u.和突降0.2p.u.,电网电压和变换器输出电压之间的电压差在0.30 s时会发生突增,在0.35 s时发生突降。采用传统预同步控制策略时电压差会逐渐增大,对电力系统安全稳定运行带来了不利影响,直到0.50 s并网时才会达到稳定。而采用基于改进LADRC的构网型变换器控制策略时,电压差很快会得到降低,同时加速了预同步进程。
图11从0.50 s之后定量指标可见,采用改进型LADRC策略时|Δfmax|=0.038 Hz,相比于采用传统LADRC策略时|Δfmax|=0.270 Hz,评价指标降低了85.926%。通过对图10图11波形分析,发现采用改进型LADRC策略可以加速系统预同步进程,有效抑制电压突变对系统频率带来的扰动,可以在较小的频率波动情况下提供足够的有功支撑,系统频率快速恢复。
考虑到电网中频率的不稳定性,在0.30 s时电网电压频率突降0.2 Hz后在0.35 s时突增0.2 Hz,0.50 s时给出启动预同步信号,系统预同步仿真总时长为1.00 s,电网频率突变工况下电压同步波形及系统频率、电压和功率波形如图12图13所示。
图12可见,在电网频率突变工况下,0.30 s和0.35 s时电压频率突增0.20 Hz和突降0.20 Hz,电网电压和变换器输出电压之间的电压差会发生突变,采用传统预同步控制策略时电压差在0.50 s之前一直较大,这对变换器的预同步进程带来了不利影响,直到0.50 s并网时才会达到稳定,这在0.50 s时的并网过程中对电网的电能质量会产生较大的不利影响,但是采用基于改进LADRC的构网型变换器控制策略时,电压差在0.30 s之前会得到迅速降低,在0.30~0.35 s的频率变化区段,电压差也会比采用传统预同步控制时的电压差小,说明改进LADRC控制策略能够对电压进行快速控制,这对加速预同步进程具有促进作用。对图13从0.50 s之后定量指标分析可知,采用改进型LADRC策略时|Δfmax|=0.028 Hz,相比于采用传统LADRC策略时|Δfmax|=0.032 Hz,评价指标降低了12.5%。通过对图12图13波形分析,发现采用改进型LADRC策略对外界干扰的抑制具有优良效果,能够显著改善电网频率突变给系统频率波动带来的不利影响,同时能够加速系统预同步进程,确保系统运行安全稳定。
图13可见,在频率突变工况下,0.50 s并网时变换器通过有功出力迅速变化对电力系统进行调频,采用改进型LADRC策略时的有功变化比其他两种方法更加迅速灵活,这是对基于坐标变换的无PLL预同步控制和改进LADRC控制快速响应的结果。
本文针对构网型变换器预同步时电力系统频率电压稳定性低导致并网失败的问题,提出一种基于改进LADRC的构网型变换器预同步控制策略。
1)从变换器系统底层控制原理角度和基于相位补偿的无锁相环预同步控制角度分析变换器预同步系统的影响特性,通过相位偏差的反馈控制对电网电压的相位和幅值进行同步追踪,并在有功频率支路环节的角频率输出端引入改进LADRC环节可以有效加速抑制系统频率震荡,充分挖掘构网型变换器系统的调频调压能力,从而确保构网型变换器预同步过程正常最终实现成功并网。
2)提出改进型LADRC构网型变换器预同步控制策略,将有功控制环节和角频率输出环节串联控制,配合基于坐标变化的无锁相环控制策略对变换器输出电压进行相位补偿,实现整体出力的优化控制,构网型变换器预同步控制系统具有更优的协同控制性能。
3)所提改进型LADRC构网型变换器预同步控制策略在综合负荷需求突然变化、电网电压、频率以及相位出现波动等复杂工况下,相比传统预同步控制策略具有更优的调频调压效果,能够为电网频率提供充足的支撑,确保变换器系统预同步安全稳定运行,最终实现成功并网。
  • 国网冀北电力有限公司科技项目(52018K23000G)
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2024年第53卷第8期
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doi: 10.19666/j.rlfd.202404073
  • 接收时间:2024-04-22
  • 首发时间:2026-01-07
  • 出版时间:2024-08-25
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  • 收稿日期:2024-04-22
基金
Technology Project of State Grid Jibei Electric Power Co., Ltd.(52018K23000G)
国网冀北电力有限公司科技项目(52018K23000G)
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    国网冀北电力科学研究院(华北电力科学研究院有限责任公司),北京 100045

通讯作者:

刘辉(1975),男,博士,教授级高级工程师,主要研究方向为新能源并网技术,
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
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
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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