多谐波源下分布式电源并网逆变器的谐波抑制策略

doi:10.19595/j.cnki.1000-6753.tces.221907

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Abstract Nowadays, more and more power-electronics-interfaced distributed generations （DGs） and new loads are connected to the distribution network, which endows the electricity grids superior flexibility and controllability. However, with the penetration of DGs and intensive utilization of nonlinear loads, the resulting grid distortion will seriously threaten the grid current quality of DGs and deteriorates the voltage of critical loads in the distribution network. Recently, few researches geared toward the quantitative analysis of the fundamental limitation in the dual harmonics suppression, nor the adaptability improvement of DGs in the presents of both the local nonlinear loads and distorted grid. To address these issues, this paper proposes a hybrid harmonic suppression scheme, which leads to substantially lower total harmonic distortion for both the local load voltage and the grid current at the same time.
First, the constraint involved in the simultaneous elimination of distortion for both the inverter local voltage and the grid current is quantitatively analyzed. The conventional method to restrain local voltage harmonic uh s was to abate the inverter output harmonic impedance Zh o via a negative feedforward. However, the suppression of grid current harmonic ih g might be compromised since ih g is also nonlinear with Zh o from the numerical expression. Therefore, the restriction of the two distortions entirely and simultaneously appears infeasible for the intrinsic contradiction by using one control variable Zh o. Then, a hybrid harmonic suppression based on multiple harmonic sequence component observer （MHSCO） is proposed, which mainly consists of a local voltage harmonic control loop and a grid current-controlled voltage compensator. MHSCO is introduced rather than conventional DFT for the accurate and exhaustive extraction of individual harmonics simultaneously, so that individual harmonic components in grid current and local voltage are extracted respectively and with superior time-varying response characteristics. A local voltage harmonic control loop is designed to scale down Zh o, while a grid current-controlled compensator is elaborated to reduce the harmonic admittance 1/Zh g via an additional voltage. The system small-signal model is deduced and the adaptability of proposed strategy to the perturbation of grid impedance L_gis studied. The eigenvalue locus indicates L_g should be maintained neither too large nor too small to ensure system stability.
Hardware in the loop simulation is performed subsequently. The local voltage harmonic control loop and grid current-controlled compensator of the proposed strategy are activated successively in the first simulation scenario. When the local voltage harmonic control loop is first operated, uh s decrease from 8.9% and to 2.29%, while ih g increase from 15.35% to 26.13% because of constraint of the two harmonics. When the grid current-controlled compensator is added at the same time, uh s and ih g are suppressed to 2.42% and 2.24% respectively. In the subsequent simulation scenario, L_g is decreased from 2.3 mH to 1.8 mH to investigated the robust against the variation of grid impedance. The THDs of u_s and i_g are maintained low at 2.69% and 2.83% in this scenario, respectively. In the case of load fluctuations, the effectiveness of proposed strategy and conventional strategy is compared and evaluated. When the proportion of linear load at PCC increases, the THD of u_s drops by 20.7% with the proposed method, which is greater than that of the conventional method 13.3%, while the THD of i_g increases by 42.4% with the proposed method, lower than the that of the conventional method 85.8% . When nonlinear load doubles, the THD of u_s and i_g of the conventional method rise by 36.7% and 17.8%, which are significantly higher than those of the proposed method 5.2% and 6.6%.
The following conclusions can be drawn from the simulation analysis: (1) The concurrent suppression of voltage harmonics and grid current harmonics can be achieved with the proposed strategy, thus ensuring the power quality of the inverter and the local critical loads. (2) The THD of local voltage and grid current maintained low with a small grid impedance. In this sense, the proposed control strategy is robust to the perturbation of grid impedance to a certain extent. (3) Compared with conventional control methods, proposed method exhibits lower volatility of THD under load variation, which indicate superior adaptability against load fluctuation.

Key words： Distributed generations nonlinear loads distorted grid harmonic suppression grid-connected inverter

Received: 08 October 2022

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TM464

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	Yang Quan
	Liang Yongchang
	Wei Jianrong
	Liu Yilin
	Yuan Zhicong

Cite this article:

Yang Quan,Liang Yongchang,Wei Jianrong等. Research on Harmonic Suppression Strategy of Grid Connected Inverter under Multi-Harmonic Sources[J]. Transactions of China Electrotechnical Society, 2023, 38(11): 2908-2920.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221907 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I11/2908

[1] 李文番, 张国钢, 钟浩杰, 等. 一种高频率分辨率的谐波、间谐波分析模型[J]. 电工技术学报, 2022, 37(13): 3372-3379, 3403.
Li Wenfan, Zhang Guogang, Zhong Haojie, et al.A high frequency resolution harmonic and interharmonic analysis model[J]. Transactions of China Electrotechnical Society, 2022, 37(13): 3372-3379, 3403.
[2] 李勇, 刘珮瑶, 胡斯佳, 等. 基于感应滤波的光伏电站谐波谐振抑制方法[J]. 电工技术学报, 2022, 37(15): 3781-3793.
Li Yong, Liu Peiyao, Hu Sijia, et al.Harmonic resonance damping method of photovoltaic power station based on inductive filtering[J]. Transactions of China Electrotechnical Society, 2022, 37(15): 3781-3793.
[3] IEEE Recommended Practices and Requirements for Harmonic Control in Electrical PowerSystems: 519-1992[S]. Institute of Electrical and Electronics Engineers, 1992.
[4] 国家技术监督局. 电能质量公用电网谐波: GB/T 14549—1993[S]. 北京: 中国标准出版社, 1994.
[5] Hashempour M M, Savaghebi M, Vasquez J C, et al.A control architecture to coordinate distributed generators and active power filters coexisting in a microgrid[J]. IEEE Transactions on Smart Grid, 2016, 7(5): 2325-2336.
[6] He Jinwei, Li Yun wei, Wang Ruiqi, et al. A measurement method to solve a problem of using DG interfacing converters for selective load harmonic filtering[J]. IEEE Transactions on Power Electronics, 2016, 31(3): 1852-1856.
[7] Campos-Gaona D, Peña-Alzola R, Monroy-Morales J L, et al. Fast selective harmonic mitigation in multifunctional inverters using internal model controllers and synchronous reference frames[J]. IEEE Transactions on Industrial Electronics, 2017, 64(8): 6338-6349.
[8] 耿乙文, 田芳芳, 孙帅, 等. 一种基于虚拟同步发电机的电流谐波抑制方法[J]. 电工技术学报, 2018, 33(5): 1040-1050.
Geng Yiwen, Tian Fangfang, Sun Shuai, et al.A method of current harmonics suppression based on VSG[J]. Transactions of China Electrotechnical Society, 2018, 33(5): 1040-1050.
[9] 陈杰, 章新颖, 闫震宇, 等. 基于虚拟阻抗的逆变器死区补偿及谐波电流抑制分析[J]. 电工技术学报, 2021, 36(8): 1671-1680.
Chen Jie, Zhang Xinying, Yan Zhenyu, et al.Dead-time effect and background grid-voltage harmonic suppression methods for inverters with virtual impedance control[J]. Transactions of China Electrotechnical Society, 2021, 36(8): 1671-1680.
[10] 徐健, 曹鑫, 郝振洋, 等. 基于电网谐波电压前馈的虚拟同步整流器电流谐波抑制方法[J]. 电工技术学报, 2022, 37(8): 2018-2029.
Xu Jian, Cao Xin, Hao Zhenyang, et al.A harmonic-current suppression method for virtual synchronous rectifier based on feedforward of grid harmonic voltage[J]. Transactions of China Electrotechnical Society, 2022, 37(8): 2018-2029.
[11] 孟令辉, 舒泽亮, 闫晗, 等. 基于特征次谐波补偿的单相统一电能质量调节器并联变换器控制策略[J]. 电工技术学报, 2020, 35(24): 5125-5133.
Meng Linghui, Shu Zeliang, Yan Han, et al.Control strategy for single-phase unified power quality conditioner of parallel converter based on specific order harmonics compensation[J]. Transactions of China Electrotechnical Society, 2020, 35(24): 5125-5133.
[12] Zhong Qingchang.Harmonic droop controller to reduce the voltage harmonics of inverters[J]. IEEE Transactions on Industrial Electronics, 2013, 60(3): 936-945.
[13] Micallef A, Apap M, Spiteri-Staines C, et al.Mitigation of harmonics in grid-connected and islanded microgrids via virtual admittances and impedances[J]. IEEE Transactions on Smart Grid, 2017, 8(2): 651-661.
[14] 戴喜良. 基于虚拟电容补偿的级联型有源电力滤波器控制策略[J]. 电气技术, 2021, 22(6): 49-53.
Dai Xiliang.Cascaded active power filter control strategy based on virtual capacitor compensation[J]. Electrical Engineering, 2021, 22(6): 49-53.
[15] He Jinwei, Li Yunwei, Munir M S.A flexible harmonic control approach through voltage-controlled DG-grid interfacing converters[J]. IEEE Transactions on Industrial Electronics, 2012, 59(1): 444-455.
[16] 涂春鸣, 杨义, 肖凡, 等. 非线性负载下微电网主逆变器输出侧电能质量控制策略[J]. 电工技术学报, 2018, 33(11): 2486-2495.
Tu Chunming, Yang Yi, Xiao Fan, et al.The output side power quality control strategy for microgrid main inverter under nonlinear load[J]. Transactions of China Electrotechnical Society, 2018, 33(11): 2486-2495.
[17] 石荣亮, 张兴, 刘芳, 等. 不平衡与非线性混合负载下的虚拟同步发电机控制策略[J]. 中国电机工程学报, 2016, 36(22): 6086-6095.
Shi Rongliang, Zhang Xing, Liu Fang, et al.A control strategy for unbalanced and nonlinear mixed loads of virtual synchronous generators[J]. Proceedings of the CSEE, 2016, 36(22): 6086-6095.
[18] 张辉, 张瑞雪. 非线性负载下虚拟同步发电机的控制策略[J]. 电气传动, 2019, 49(10): 48-50.
Zhang Hui, Zhang Ruixue.Control strategy for the nonlinear load of virtual synchronous generator[J]. Electric Drive, 2019, 49(10): 48-50.
[19] Sou W K, Choi W H, Chao Chiwa, et al.A deadbeat current controller of LC-hybrid active power filter for power quality improvement[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020, 8(4): 3891-3905.
[20] Yan Qingzeng, Wu Xiaojie, Yuan Xibo, et al.An improved grid-voltage feedforward strategy for high-power three-phase grid-connected inverters based on the simplified repetitive predictor[J]. IEEE Transactions on Power Electronics, 2016, 31(5): 3880-3897.
[21] 赵强松, 陈莎莎, 周晓宇, 等. 用于并网逆变器谐波抑制的重复-比例复合控制器分析与设计[J]. 电工技术学报, 2019, 34(24): 5189-5198.
Zhao Qiangsong, Chen Shasha, Zhou Xiaoyu, et al.Analysis and design of combination controller based on repetitive control and proportional control for harmonics suppression of grid-tied inverters[J]. Transactions of China Electrotechnical Society, 2019, 34(24): 5189-5198.
[22] Peng Yunjian, Sun Weijie, Deng Feiqi.Internal model principle method to robust output voltage tracking control for single-phase UPS inverters with its SPWM implementation[J]. IEEE Transactions on Energy Conversion, 2021, 36(2): 841-852.
[23] Zhou Leming, Shuai Zhikang, Chen Yandong, et al.Impedance-based harmonic current suppression method for VSG connected to distorted grid[J]. IEEE Transactions on Industrial Electronics, 2020, 67(7): 5490-5502.
[24] 钟庆昌. 虚拟同步机与自主电力系统[J]. 中国电机工程学报, 2017, 37(2): 336-349.
Zhong Qingchang.Virtual synchronous machines and autonomous power systems[J]. Proceedings of the CSEE, 2017, 37(2): 336-349.
[25] 吕志鹏, 盛万兴, 刘海涛, 等. 虚拟同步机技术在电力系统中的应用与挑战[J]. 中国电机工程学报, 2017, 37(2): 349-360.
Lü Zhipeng, Sheng Wanxing, Liu Haitao, et al.Application and challenge of virtual synchronous machine technology in power system[J]. Proceedings of the CSEE, 2017, 37(2): 349-360.
[26] Bidram A, Davoudi A, Lewis F L, et al.Distributed cooperative secondary control of microgrids using feedback linearization[J]. IEEE Transactions on Power Systems, 2013, 28(3): 3462-3470.
[27] Quan Xiangjun, Dou Xiaobo, Wu Zaijun, et al.A concise discrete adaptive filter for frequency estimation under distorted three-phase voltage[J]. IEEE Transactions on Power Electronics, 2017, 32(12): 9400-9412.
[28] 刘华吾, 胡海兵, 邢岩. 有限字长对滑动窗DFT稳定性的影响研究[J]. 电工技术学报, 2016, 31(11): 22-31.
Liu Huawu, Hu Haibing, Xing Yan.Research of finite-word-length effects on the stability of the sliding DFT[J]. Transactions of China Electrotechnical Society, 2016, 31(11): 22-31.