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For an LCL-type inverter connected to weak grid, the appearance of grid impedance often results in a decrease in the phase margin, serious distortion of grid-connected current and even system instability. To solve this problem, an improved grid-connected current control strategy is proposed, in which a multi-resonance controller is introduced in the voltage feedforward loop to suppress the voltage background harmonics and a phase compensator is added to the current feedforward loop to improve the system's phase margin, so as to avoid the risk that the resonance peak of the multi-resonance link intersects with the -180° line. Theoretical analysis and simulation results show that the proposed strategy can effectively suppress the harmonics of LCL-type grid-connected current, improve the current quality and enhance the stability of the grid-connected system.
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针对弱电网环境下电网阻抗的出现导致LCL型并网逆变器系统的相位裕度下降,造成严重的并网电流畸变,甚至系统失稳的问题,提出1种改进并网电流控制策略。在电压前馈环中引入多谐振控制器以抑制电网电压背景谐波,并在电流前馈环中加入相位补偿器以提升系统相位裕度,从而避免多谐振环节的谐振峰与-180°线交汇的风险。理论分析与仿真实验结果均表明,所提策略可有效抑制弱电网下 LCL 型并网电流谐波,提高电流质量,增强并网系统的稳定性。
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朱胤杰(1997-),男,硕士研究生。研究方向:新能源并网控制技术。E-mail: zhuyinjie0574@qq.com。 |
苗虹(1971-),女,通信作者,博士,副教授。研究方向:分布式发电与微电网。E-mail: 1604681549@qq.com。
曾成碧(1969-),女,博士,教授。研究方向:新能源发电与并网。E-mail: 857606631@qq.com。
童广(1997-),男,硕士研究生。研究方向:LCL 逆变器并网稳定性控制。E-mail: 397174172@qq.com。
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曾成碧(1969-),女,博士,教授。研究方向:新能源发电与并网。E-mail: 857606631@qq.com。
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童广(1997-),男,硕士研究生。研究方向:LCL 逆变器并网稳定性控制。E-mail: 397174172@qq.com。
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童广(1997-),男,硕士研究生。研究方向:LCL 逆变器并网稳定性控制。E-mail: 397174172@qq.com。
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40(11): 3592-3602 (in Chinese)., articleTitle=High robustness weighted average current control for LCL-type grid-connected inverter in a weak grid, refAbstract=null)], funds=[Fund(id=1154032498238546885, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, awardId=2018YFC1505502-03, language=EN, fundingSource=National Key R&D Program of China(2018YFC1505502-03), fundOrder=null, country=null), Fund(id=1154032498301461446, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, awardId=2018YFC1505502-03, language=CN, fundingSource=国家重点研发计划资助项目(2018YFC1505502-03), fundOrder=null, country=null), Fund(id=1154032498364376007, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, awardId=2021YFG0256, language=EN, fundingSource=Key R&D Program of Sichuan Province(2021YFG0256), fundOrder=null, country=null), Fund(id=1154032498414707656, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, awardId=2021YFG0256, language=CN, fundingSource=四川省重点研发资助项目(2021YFG0256), fundOrder=null, country=null), Fund(id=1154032498477622217, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, awardId=2021YFG0218, language=EN, fundingSource=Key R&D Program of Sichuan Province(2021YFG0218), fundOrder=null, country=null), Fund(id=1154032498532148170, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, awardId=2021YFG0218, language=CN, fundingSource=四川省重点研发资助项目(2021YFG0218), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1154032493196993390, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, xref=null, ext=[AuthorCompanyExt(id=1154032493205381999, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, companyId=1154032493196993390, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Electrical Engineering Sichuan University Chengdu 61065 China), AuthorCompanyExt(id=1154032493209576304, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, companyId=1154032493196993390, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=四川大学 电气工程学院 成都 61065)])], figs=[ArticleFig(id=1154032495864570785, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 1, caption=
Topology of three-phase LCL-type grid-connected inverter, figureFileSmall=Z3rf0/QLMMB6/W0z1XhmUg==, figureFileBig=+h0dDV9X9SHF11dklTh3tA==, tableContent=null), ArticleFig(id=1154032495935873954, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图1, caption=
三相 LCL 并网逆变器拓扑, figureFileSmall=Z3rf0/QLMMB6/W0z1XhmUg==, figureFileBig=+h0dDV9X9SHF11dklTh3tA==, tableContent=null), ArticleFig(id=1154032496011371427, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 2, caption=
Block diagram of grid-connected current feedforward under quasi-proportional resonant control, figureFileSmall=crmI0CN76xFY1dBgR3LPpg==, figureFileBig=y80O8VHjTNBR1B+td3b5iA==, tableContent=null), ArticleFig(id=1154032496061703076, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图2, caption=
并网电流前馈的准比例谐振控制框图, figureFileSmall=crmI0CN76xFY1dBgR3LPpg==, figureFileBig=y80O8VHjTNBR1B+td3b5iA==, tableContent=null), ArticleFig(id=1154032496116229029, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 3, caption=
Block diagram of system structure under multi-resonance control strategy for grid voltage feedforward, figureFileSmall=irb94Vv22Qw24Yht+Y/uwA==, figureFileBig=FsXUrU/pEPlhT8dAuQy9FQ==, tableContent=null), ArticleFig(id=1154032496200115110, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图3, caption=
采用电网电压前馈多谐振控制策略的系统结构, figureFileSmall=irb94Vv22Qw24Yht+Y/uwA==, figureFileBig=FsXUrU/pEPlhT8dAuQy9FQ==, tableContent=null), ArticleFig(id=1154032496271418279, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 4, caption=
Open-loop frequency characteristics of system with multi-resonance controller, figureFileSmall=7iUDPDbfzKrI+4zzYtn3vQ==, figureFileBig=bEjNOyuMzJfpmEbO/gLLGA==, tableContent=null), ArticleFig(id=1154032496334332840, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图4, caption=
引入多谐振控制器后的系统开环频率特性, figureFileSmall=7iUDPDbfzKrI+4zzYtn3vQ==, figureFileBig=bEjNOyuMzJfpmEbO/gLLGA==, tableContent=null), ArticleFig(id=1154032496422413225, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 5, caption=
Block diagram of system structure under phase compensation control strategy for grid-connected current feedforward, figureFileSmall=2szVGdpTcRsLZjv73gXDOQ==, figureFileBig=3+ELw4o7yyKbQ0K1sgJhVA==, tableContent=null), ArticleFig(id=1154032496481133482, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图5, caption=
采用并网电流前馈相位补偿控制策略的系统结构框图, figureFileSmall=2szVGdpTcRsLZjv73gXDOQ==, figureFileBig=3+ELw4o7yyKbQ0K1sgJhVA==, tableContent=null), ArticleFig(id=1154032496556630955, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 6, caption=
General frequency characteristic of phase compensator, figureFileSmall=ePG/zQFnbdL1f/SeLb742A==, figureFileBig=C7nkEm3TqQKhaOyfOee2uA==, tableContent=null), ArticleFig(id=1154032496636322732, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图6, caption=
相位补偿器的一般频率特性, figureFileSmall=ePG/zQFnbdL1f/SeLb742A==, figureFileBig=C7nkEm3TqQKhaOyfOee2uA==, tableContent=null), ArticleFig(id=1154032496690848685, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 7, caption=
Frequency characteristics of system under improved grid-connected current control strategy, figureFileSmall=ewotFLOEdLDygyb/Xco71g==, figureFileBig=IRHbUbjIMYpZo7p3lVw+TQ==, tableContent=null), ArticleFig(id=1154032496757957550, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图7, caption=
采用改进并网电流控制策略的系统频率特性, figureFileSmall=ewotFLOEdLDygyb/Xco71g==, figureFileBig=IRHbUbjIMYpZo7p3lVw+TQ==, tableContent=null), ArticleFig(id=1154032496812483503, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 8, caption=
Grid-connected current waveforms under two control strategies when ${L}_{\mathrm{g}}= 0\mathrm{{mH}}$, figureFileSmall=7WaK9otC5rO+FKYgyydPCQ==, figureFileBig=CSS813CsOznkhfzgsjUUuw==, tableContent=null), ArticleFig(id=1154032496862815152, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图8, caption=
${L}_{\mathrm{g}}= 0\mathrm{{mH}}$ 时 2 种控制策略下的并网电流仿真波形, figureFileSmall=7WaK9otC5rO+FKYgyydPCQ==, figureFileBig=CSS813CsOznkhfzgsjUUuw==, tableContent=null), ArticleFig(id=1154032496934118321, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 9, caption=
Grid-connected current waveforms under two strategies when ${L}_{\mathrm{g}}= 1\mathrm{{mH}}$, figureFileSmall=ZFDXJkUt6QSjWoj4yRVr/g==, figureFileBig=BicmnMmO53bmSH/axkhzdg==, tableContent=null), ArticleFig(id=1154032496980255666, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图9, caption=
${L}_{\mathrm{g}}= 1\mathrm{{mH}}$ 时 2 种策略下的并网电流仿真波形, figureFileSmall=ZFDXJkUt6QSjWoj4yRVr/g==, figureFileBig=BicmnMmO53bmSH/axkhzdg==, tableContent=null), ArticleFig(id=1154032497034781619, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 10, caption=
Grid-connected current waveforms under two strategies when ${L}_{\mathrm{g}}= 3\mathrm{{mH}}$, figureFileSmall=zlCfXdar95mryhRygTu2FQ==, figureFileBig=HbxCmxPjF0dDJfRVSlFNJQ==, tableContent=null), ArticleFig(id=1154032497101890484, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图10, caption=
${L}_{\mathrm{g}}= 3\mathrm{{mH}}$ 时 2 种策略下的并网电流仿真波形, figureFileSmall=zlCfXdar95mryhRygTu2FQ==, figureFileBig=HbxCmxPjF0dDJfRVSlFNJQ==, tableContent=null), ArticleFig(id=1154032497164805045, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 11, caption=
Harmonic analysis under two strategies when ${L}_{\mathrm{g}}= 3\mathrm{{mH}}$, figureFileSmall=ug5s8+N26sK1sXa7R+KzSw==, figureFileBig=36A1DiXyKcji1tyoDWNcrA==, tableContent=null), ArticleFig(id=1154032497219330998, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图11, caption=
${L}_{\mathrm{g}}= 3\mathrm{{mH}}$ 时 2 种策略的谐波分析, figureFileSmall=ug5s8+N26sK1sXa7R+KzSw==, figureFileBig=36A1DiXyKcji1tyoDWNcrA==, tableContent=null), ArticleFig(id=1154032497282245559, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 12, caption=
Grid-connected current waveforms when switching current amplitude, figureFileSmall=FQL9D7boajD2ersb3Xluyg==, figureFileBig=XMB/2biVN/tO/uT7n2bD1Q==, tableContent=null), ArticleFig(id=1154032497340965816, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图12, caption=
切换电流幅值的并网电流波形, figureFileSmall=FQL9D7boajD2ersb3Xluyg==, figureFileBig=XMB/2biVN/tO/uT7n2bD1Q==, tableContent=null), ArticleFig(id=1154032497391297465, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 13, caption=
Experimental platform, figureFileSmall=du9coF6dFliKViH32Wz2QQ==, figureFileBig=5vP1BA/ApelGIgZ5qkdIKQ==, tableContent=null), ArticleFig(id=1154032497454212026, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图13, caption=
实验平台, figureFileSmall=du9coF6dFliKViH32Wz2QQ==, figureFileBig=5vP1BA/ApelGIgZ5qkdIKQ==, tableContent=null), ArticleFig(id=1154032497521320891, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 14, caption=
Experimental waveforms of grid-connected current under two control strategies when ${L}_{\mathrm{g}}= 0\mathrm{{mH}}$, figureFileSmall=5B9gO5YPtzhGoIxKpa9gpw==, figureFileBig=n14OVq35ImGlaQx9+/q8rA==, tableContent=null), ArticleFig(id=1154032497575846844, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图14, caption=
${L}_{\mathrm{g}}= 0\mathrm{{mH}}$ 时 2 种控制策略下的并网电流实验波形, figureFileSmall=5B9gO5YPtzhGoIxKpa9gpw==, figureFileBig=n14OVq35ImGlaQx9+/q8rA==, tableContent=null), ArticleFig(id=1154032497626178493, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 15, caption=
Experimental waveforms of grid-connected current under two strategies when ${L}_{\mathrm{g}}= 3\mathrm{{mH}}$, figureFileSmall=f/TlgyDMKC1cMitJCdTyNA==, figureFileBig=Bxe3hRvpPC/2H0AMyDA9SQ==, tableContent=null), ArticleFig(id=1154032497684898750, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图15, caption=
${L}_{\mathrm{g}}= 3\mathrm{{mH}}$ 时 2 种策略下的并网电流实验波形, figureFileSmall=f/TlgyDMKC1cMitJCdTyNA==, figureFileBig=Bxe3hRvpPC/2H0AMyDA9SQ==, tableContent=null), ArticleFig(id=1154032497752007615, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Fig. 16, caption=
Experimental waveforms of grid-connected current when switching current amplitude, figureFileSmall=+iHE5+40UV5grobK/RNzLA==, figureFileBig=SEC3ere9jr1kJBC1AzEghA==, tableContent=null), ArticleFig(id=1154032497814922176, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=图16, caption=
切换电流幅值的并网电流实验波形, figureFileSmall=+iHE5+40UV5grobK/RNzLA==, figureFileBig=SEC3ere9jr1kJBC1AzEghA==, tableContent=null), ArticleFig(id=1154032497877836737, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Tab. 1, caption=
Parameters of system, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 | 参数 | 数值 |
| 直流电压${U}_{\mathrm{{dc}}}/\mathrm{V}$ | 200 | 电网电压${u}_{\mathrm{g}}/\mathrm{V}$ | 110 |
| 滤波电感${L}_{1}/\mathrm{{mH}}$ | 3 | 电网电压频率${f}_{0}/\mathrm{{Hz}}$ | 50 |
| 滤波电容$C/\mu \mathrm{F}$ | 10 | 采样频率${f}_{\mathrm{s}}/\mathrm{{kHz}}$ | 30 |
| 滤波电感${L}_{2}/\mathrm{{mH}}$ | 1 | 开关频率${f}_{\mathrm{{sw}}}/\mathrm{{kHz}}$ | 15 |
| 比例系数${K}_{\mathrm{p}}$ | 100 | 3th 谐振系数 | 95 |
| 基频谐振系数${K}_{\mathrm{r}1}$ | 0.6 | 5th 谐振系数 | 95 |
| 截止带宽${\omega }_{c}$ | 3.14 | 7th 谐振系数 | 80 |
| 谐振深度${\omega }_{\mathrm{f}}$ | 15 | 9th 谐振系数 | 70 |
), ArticleFig(id=1154032497932362690, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=表1, caption=
系统参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 | 参数 | 数值 |
| 直流电压${U}_{\mathrm{{dc}}}/\mathrm{V}$ | 200 | 电网电压${u}_{\mathrm{g}}/\mathrm{V}$ | 110 |
| 滤波电感${L}_{1}/\mathrm{{mH}}$ | 3 | 电网电压频率${f}_{0}/\mathrm{{Hz}}$ | 50 |
| 滤波电容$C/\mu \mathrm{F}$ | 10 | 采样频率${f}_{\mathrm{s}}/\mathrm{{kHz}}$ | 30 |
| 滤波电感${L}_{2}/\mathrm{{mH}}$ | 1 | 开关频率${f}_{\mathrm{{sw}}}/\mathrm{{kHz}}$ | 15 |
| 比例系数${K}_{\mathrm{p}}$ | 100 | 3th 谐振系数 | 95 |
| 基频谐振系数${K}_{\mathrm{r}1}$ | 0.6 | 5th 谐振系数 | 95 |
| 截止带宽${\omega }_{c}$ | 3.14 | 7th 谐振系数 | 80 |
| 谐振深度${\omega }_{\mathrm{f}}$ | 15 | 9th 谐振系数 | 70 |
), ArticleFig(id=1154032497999471555, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=EN, label=Tab. 2, caption=
Specifications of main components, figureFileSmall=null, figureFileBig=null, tableContent=
| 设备名称 | 型号规格 |
| 逆变器 | MWINV-9R144; Myway(9.1 kW) |
| 电流探头 | HAS50-S (50 A/4 V) |
| 电压探头 | CVC-25 (500 V/5 V) |
| 电解电容 | ERWE451LGC152MCB5M |
| 可编程电源 | Chroma-61815 |
| 二极管模块 | PT5221 |
| 电磁式继电器 | SD-N35(CX) DC24V |
| 数字信号处理器 | TMS320C6657 |
| 开关式电源 | FBA100F-24 (DC244.5A) |
| IGBT-IPM | 7MBP50RJ120 |
), ArticleFig(id=1154032498053997508, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375943155503526, language=CN, label=表2, caption=
主要设备规格, figureFileSmall=null, figureFileBig=null, tableContent=
| 设备名称 | 型号规格 |
| 逆变器 | MWINV-9R144; Myway(9.1 kW) |
| 电流探头 | HAS50-S (50 A/4 V) |
| 电压探头 | CVC-25 (500 V/5 V) |
| 电解电容 | ERWE451LGC152MCB5M |
| 可编程电源 | Chroma-61815 |
| 二极管模块 | PT5221 |
| 电磁式继电器 | SD-N35(CX) DC24V |
| 数字信号处理器 | TMS320C6657 |
| 开关式电源 | FBA100F-24 (DC244.5A) |
| IGBT-IPM | 7MBP50RJ120 |
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