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弱电网下逆变器间谐波振荡特征分析与抑制方法的研究

来源：电工电气发布时间：2025-01-07 12:07 浏览次数：11

弱电网下逆变器间谐波振荡特征分析与抑制方法的研究

李知城¹，何海鹏¹，吴良弼¹，陈华胜¹，吴林翰¹，刘俊峰²

(1 广东电网有限责任公司湛江供电局，广东湛江 524000；

2 华南理工大学自动化科学与工程学院，广东广州 510640)

摘要：弱电网下逆变器会与电网发生交互，产生间谐波振荡，而导致严重的电能质量问题。建立了弱电网下并网逆变器的阻抗模型，并基于阻抗模型通过特征提取分析系统的稳定性；对间谐波振荡所引起的电能质量问题进行了机理分析，依据分析结果提出了一种新型锁相环结构，可以抑制逆变器在弱电网下的间谐波振荡，来解决其所引起的电能质量问题。仿真与实验结果表明，所提新型锁相环结构通过锁相环前置带通滤波器抑制谐波从而提升系统的稳定性，且有效地减少了传统锁相环结构所导致的超调问题，与传统锁相环结构在动态性能上相差不大。

关键词： 逆变器；弱电网；间谐波振荡；电能质量；锁相环结构；带通滤波器；特征提取

中图分类号：TM464 ；TM712 文献标识码：A 文章编号：1007-3175(2024)12-0042-06

Research on Characteristic Analysis and Suppression Methods of

Interharmonic Oscillations for Inverters Under Weak Grid

LI Zhi-cheng¹, HE Hai-peng¹, WU Liang-bi¹, CHEN Hua-sheng¹, WU Lin-han¹, LIU Jun-feng²

（1 Zhanjiang Power Supply Bureau of Guangdong Power Grid Co., Ltd, Zhanjiang 524000, China;

2 School of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, China）

Abstract: Under the weak grid, the inverter will interact with the grid and generate interharmonic oscillations, which will lead to serious power quality problems. The impedance model of the grid-connected inverter under a weak grid is established, and the stability of the system is analyzed by feature extraction based on the impedance model; the mechanism of the power quality problem caused by interharmonic oscillations is analyzed, and based on the analytical results, a new phase-locked-loop structure is proposed, which can inhibit the interharmonic oscillations of the inverter under a weak grid and solve the power quality problem caused by the interharmonic oscillations. Simulation and experimental results show that the proposed new phase-locked loop structure can improve the stability of the system by suppressing the harmonics through the phase-locked loop front band-pass filter, and effectively reduce the overshooting problem caused by the traditional phaselocked loop structure, which is not much different from the traditional phase-locked loop structure in terms of dynamic performance.

Key words: inverter; weak grid; interharmonic oscillation; power quality; phase-locked loop structure; band-pass filter; feature extraction

参考文献

[1] BLAABJERG F, MA Ke. Future on Power Electronics for Wind Turbine Systems[J].IEEE Journal Emerging and Selected Topics in Power Electronics，2013，1(3) ：139-152.

[2] QIAN Qiang , XIE Shaojun , HUANG Liuliu ,et al.Harmonic Suppression and Stability Enhancement for Parallel Multiple Grid-Connected Inverters Based on Passive Inverter Output Impedance[J].IEEE Transactions on Industrial Electronics，2017，64(9) ：7587-7598.

[3] 周识远. 弱电网下光伏并网逆变器电能质量控制策略研究[J]. 东北电力技术，2021，42(5) ：6-9.

[4] SUN Jian. Impedance-Based Stability Criterion for Grid-Connected Inverters[J].IEEE Transactions on Power Electronics，2011，26(11) ：3075-3078.

[5] TU Chunming, GAO Jiayuan, XIAO Fan, et al.Stability Analysis of the Grid-Connected Inverter Considering the Asymmetric Positive-Feedback Loops Introduced by the PLL in Weak Grids[J].IEEE Transactions on Industrial Electronics，2022，69(6) ：5793-5802.

[6] LIU Huakun , XIE Xiaorong , LI Yu , et al .Mitigation of SSR by embedding subsynchronous notch filters into DFIG converter controllers[J].IET Generation, Transmission & Distribution，2017(11) ：2888-2896.

[7] LIU Huakun, XIE Xioarong, ZHANG Chuanyu,et al.Quantitative SSR Analysis of Series-Compensated DFIG-Based Wind Farms Using Aggregated RLC Circuit Model[J].IEEE Transactions on Power Systems，2017，32(1) ：474-483.

[8] LIU Huakun, XIE Xiaorong, GAO Xiaodan, et al.Stability Analysis of SSR in Multiple Wind Farms Connected to Series-Compensated Systems Using Impedance Network Model[J].IEEE Transactions on Power Systems，2018，33(3) ：3118-3128.

[9] DIN Zakiud, ZHANG Jianzhong, XU Z, et al.Recent development and future trends of resonance in doubly fed induction generator system under weak grid[J].IET Renewable Power Generation，2022，16(5) ：807-834.

[10] WANG Xiongfei, TAUL M G, WU Heng, et al.Grid-Synchronization Stability of Converter-Based Resources——An Overview[J].IEEE Open Journal Industry Applications，2020，1 ：115-134.

[11] 陈润，曾君，刘俊峰. 基于H_∞滤波器的 LCL 型并网逆变器有源阻尼方法[J]. 电源学报，2024，22(4) ：121-132.

[12] 尹君义，曾君，刘俊峰. 基于改进 CPT 谐波检测算法的 MFGTI 研究[J]. 电力电子技术，2023，57(8) ：1-5.

[13] FAN L, KAVASSERI R, MIAO Z L, et al. Modeling of DFIG-Based Wind Farms for SSR Analysis[J].IEEE Transactions on Power Delivery，2010，25(4) ：2073-2082.

[14] WANG X, HE Y, PAN D, et al.Passivity Enhancement for LCL-Filtered Inverter with Grid Current Control and Capacitor Current Active Damping[J].IEEE Transactions on Power Electronics，2022，37(4)：3801-3812.

[15] 赵志宏. 储能变流器并网电流环控制与离网发电应用研究[D]. 南京：东南大学，2017.

[16] WEN Bo, BOROYEVICH D, BURGOS R, et al.Analysis of D-Q Small-Signal Impedance of Grid-Tied Inverters[J].IEEE Transactions on Power Electronics，2016，31(1) ：675-687.

[17] CESPEDES M, SUN Jian.Impedance Modeling and Analysis of Grid-Connected Voltage-Source Converters [J] . IEEE Transactions on Power Electronics，2014，29(3) ：1254-1261.

[18] SCHWEIZER M, KOLAR J W.Shifting input filter resonances-An intelligent converter behavior for maintaining system stability[C]//International Power Electronics Conference，2010 ：906-913.

[19] GONG H, WANG X, HARNEFORS L.Rethinking Current Controller Design for PLL-Synchronized VSCs in Weak Grids[J].IEEE Transactions on Power Electronics，2022，37(2) ：1369-1381.

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弱电网下逆变器间谐波振荡特征分析与抑制方法的研究