| 22 | 0 | 27 |
| 下载次数 | 被引频次 | 阅读次数 |
针对无网压传感器控制在换流器与电网同步瞬间，可能导致冲击电流过大进而并网失败的问题，提出一种预同步控制策略，在保证跟网型变流器在弱电网下稳定性的前提下，实现基于无网压传感器控制的单相并网逆变器与电网平滑可靠并网。该控制策略通过对开关管施加占空比满足一定约束条件的周期性脉冲，使换流器作为逆变器连接到交流电网之前以单位功率因数运行在整流模式。因此，交流电网的初始相位可通过采样电流来估计，其中电流相位可通过锁相环（Phase-Locked Loop，PLL）获取。所提控制器策略无需采集公共耦合点（Point of Common Coupling，PCC）电压，即可实现换流器与电网平滑可靠并网。最后通过半实物实验测试，验证了所提控制策略的有效性。
Abstract：Aiming at the problem that the non - grid voltage sensor control may lead to excessive inrush current and grid connection failure at the instant of synchronization between the converter and the grid, this paper proposes, a pre - synchronization control strategy to ensure the stability of the grid-following type of converter under a weak grid in order to achieve smooth and reliable grid connection of a single-phase grid-connected inverter based on the non-grid voltage sensor control. The proposed control strategy applies periodic pulses that satisfy certain constraints on the duty cycle of the switching tube, so that the converter can operate in rectification mode at a unit power factor before being connected to the AC grid as an inverter. Therefore, the initial phase of the AC grid can be estimated by sampling current, and the current phase can be acquired through a phase-locked loop(PLL). The proposed controller strategy can achieve smooth and reliable grid connection between the converter and the grid without requiring the acquisition of the point of common coupling(PCC) point voltage. Finally, the effectiveness of the proposed control strategy is verified by semi-physical experimental tests.
[1] D. Dong, B. Wen, D. Boroyevich, et al. Analysis of phase-locked loop low-frequency stability in three-phase grid-connected power converters considering impedance interactions[J]. IEEE Trans. Ind. Electron., 2015, 62(1):310-321.
[2] 施凯,赵棒棒,徐培凤,等.多虚拟同步发电机并联系统的改进控制策略[J].分布式能源, 2023, 8(2):11-18. SHI Kai, ZHAO Bangbang, XU Peifeng, et al. Improved Control Strategy of Multi Virtual Synchronous Generators Parallel System[J]. Distributed Energy, 2023, 8(2):11-18.
[3] B. Wen, D. Boroyevich, R. Burgos, et al. Analysis of D-Q small-signal impedance of grid-tied inverters[J]. IEEE Trans. Power Electron., 2016, 31(1):675-687.
[4] Bevrani H, Ise T, Miura Y. Virtual Synchronous Generators:A Survey and New Perspectives[J]. International Journal of Electrical Power and Energy Systems, 2014, 54(1):244-254.
[5] Zhong Q C, Weiss G. Synchronverters:inverters that mimic synchronous generators[J]. IEEE Trans. on Industrial Electronics, 2011, 58(4):1259-1267.
[6] 梁亦峰.基于逆变器的虚拟同步发电机控制建模与仿真[J].机电工程技术, 2021, 50(3):93-96. LIANG Yifeng. Modeling and Simulation of Virtual Synchronous Generator Based on Inverter Control[J]. Mechanical&Electrical Engineering Technology, 2021, 50(3):93-96.
[7] Y. D. Kwon, R. Zhu., M. Liserre, et al. Impedance-based Stability Assessment of Self-Synchronising Power Electronics Converter[C]//2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia). Nanjing:IEEE, 2020.
[8] 杨仁杰,李宇星,吴绍云,等.含风力发电的互联电力系统自动发电控制优化方法研究[J].分布式能源, 2020, 5(6):18-26. YANG Renjie, LI Yuxing, WU Shaoyun, et al. Research on Automatic Generation Control Optimization Method of Interconnected Power System With Wind Power Generation[J]. Distributed Energy, 2020, 5(6):18-26.
[9] I. Agirman, V. Blasko. A novel control method of a VSC without ac line voltage sensors[J]. IEEE Trans. Ind. Appl., 2003, 39(2):519-524.
[10] M. Liserre, A. Pigazo, A. Dell'Aquila, et al. AnAnti-Islanding Method for Single-Phase Inverters Based on a Grid Voltage Sensorless Control[J]. IEEE Trans. Ind. Electron., 2006, 53(5):1418-1426.
[11] 仰玲芳,马俊鹏,刘天琪,等.弱电网下单相并网逆变器自同步控制策略[J].电力电子技术, 2021, 55(12):127-129, 133. YANG Lingfang, MA Junpeng, LIU Tianqi, et al. Self-synchronization Control Strategy of Single-Phase Grid-connected Inverter in Weak Grid[J]. Power electronics, 2021, 55(12):127-129, 133.
[12] A.A. Nazib, D.G. Holmes, B.P. McGrath. A self-synchronising stationary frame current control strategy for grid-connected converters with integrated frequency tracking[C]//2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (IEEE PEDG). Xi'an:IEEE, 2019.
[13] A. A. Nazib, D. G. Holmes and B. P. McGrath. Self-synchronising stationary frame current regulation for LCL grid-connected converters under unbalanced grid voltage conditions[C]//2019 IEEE Energy Conversion Congress and Exposition (ECCE). Baltimore. IEEE, 2019:4646-4653.
[14] 李新,刘国梁,杨苒晨,等.具有暂态阻尼特性的虚拟同步发电机控制策略及无缝切换方法[J].电网技术, 2018, 42(7):2081-2088. LI Xin, LIU Guoliang, YANG Ranchen, et al. VSG control strategy with transient damping term and seamless switching control method[J]. Power System Technology, 2018, 42(7):2081-2088.
[15] S. Geng, Q. Wang, J. Ren, et al. A Novel Pre-synchronization Control Strategy for Virtual Synchronous Generator Based on NLADRC-PLL[C]//2021 IEEE 4th International Electrical and Energy Conference (CIEEC). Wuhan:IEEE, 2021.
[16] 魏亚龙,张辉,孙凯.基于虚拟功率的虚拟同步发电机预同步方法[J].电力系统自动化, 2016, 40(12):124-129. WEI Yalong, ZHANG Hui, SUN Kai. Pre-synchronization method of virtual synchronous generator using virtual power[J]. Automation of Electric Power Systems, 2016, 40(12):124-129.
[17] 高永军,孙向东,周兆吉.基于虚拟阻抗功率的无锁相环并网预同步控制[J].电力电子技术, 2021, 55(4):99-102. GAO Yongjun, SUN Xiangdong, ZHOU Zhaoji. Pre-synchronization control of grid connection without phase-locked loop based on virtual impedance power[J]. Power electronics, 2021, 55(4):99-102.
[18] 石荣亮,张兴,刘芳,等.虚拟同步发电机及其在多能互补微电网中的运行控制策略[J].电工技术学报, 2016, 31(20):170-180. SHI Rongliang, ZHANG Xing, LIU Fang, et al. Control Technologies of Multi-Energy Complementary Microgrid Operation Based on Virtual Synchronous Generator[J]. Transactions of China Electrotechnical Society, 2016, 31(20):170-180.
[19] 黎荣伟,范元亮,许家浩,等.一种无锁相环的微电网逆变器预同步控制策略[J].广东电力, 2021, 34(8):43-49. LI Rongwei, FAN Yuanliang, XU Jiahao, et al. A pre-synchronization control strategy for microgrid inverters without phase-locked loops[J]. Guangdong Electric Power, 2021, 34(8):43-49.
[20] S. Prakash, J. K. Singh, R. K. Behera, et al. A Type-3 Modified SOGI-PLL With Grid Disturbance Rejection Capability for Single-Phase Grid-Tied Converters[J]. IEEE Trans. Ind. Appl., 2021, 57(4):4242-4252.
基本信息:
DOI：10.19929/j.cnki.nmgdljs.2024.0012
中图分类号:
引用信息:
[1]刘鉴钧1, 齐军1, 赵爱国1等.基于无网压传感器控制的单相并网逆变器预同步控制策略[J].内蒙古电力技术,2024,42(01):71-78.DOI:10.19929/j.cnki.nmgdljs.2024.0012.
基金信息: