Pre-synchronization Control Method for Virtual Synchronous Generator Based on Power Matching and Self-adaptive Inertia
[1]XING Pengxiang,JIA Xuanyue,XU Changqing,et al.Pre-synchronization Control Method for Virtual Synchronous Generator Based on Power Matching and Self-adaptive Inertia[J].Journal of Zhengzhou University (Engineering Science),2023,44(03):71-77.[doi:10.13705/j.issn.1671-6833.2023.03.015]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
44
Number of periods:
2023 03
Page number:
71-77
Column:
Public date:
2023-04-30
- Title:
- Pre-synchronization Control Method for Virtual Synchronous Generator Based on Power Matching and Self-adaptive Inertia
- Keywords:
- virtual synchronous generator; operation mode switching; pre-synchronization control; self-adaptive in; ertia; oscillation suppression
- CLC:
- TM73
- DOI:
- 10.13705/j.issn.1671-6833.2023.03.015
- Abstract:
- It was necessary for the virtual synchronous generator (VSG) to be synchronized with the grid when it switched from off grid mode to grid connected mode. In this study, a modified pre-synchronization control method based on power matching and self-adaptive inertia for the VSG was proposed to improve its stability after grid connection. The proposed method took the amplitude and frequency of grid voltage as the reference value for the VSG output voltage, and then adjusted its output power reference value according to the local load power, thus the voltage frequency and amplitude of the VSG could be regulated to be synchronized with the grid. Besides, feedback control of phase deviation with PI controller was applied in the frequency control loop to achieve phase synchronization. With this method, the output power corresponding to the steady-state operation point of the VSG in grid connected mode was consistent with that before grid connection, and the output power step after the VSG connected to the grid could be avoided. While, when the VSG connected to grid in non-ideal situation, power and frequency oscillations would occur in the synchronization process, so time-varying inertia was introduced in this study to accelerate the VSG to stable state. A simulation model was constructed based on MATLAB / Simulink and simulation results indicate that the proposed method can maintain the same steady-state output power before and after the VSG connected to grid, besides, oscillation time after the VSG connected to grid in non-ideal situation could be reduced by about 60%, which proved the proposed method effective.
- References:
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[1] 韩冬, 解红叶. 水电水利规划设计总院发布《中国可再 生能源发展报告 2018》[J]. 水力发电, 2019(8): 46. HAN D, XIE H Y. Hydropower planning and design institute released “China renewable energy development report 2018” [ J] . Water Power, 2019(8) : 46.[2] 王金凤, 张惠惠, 祝方圆. 基于典型场景集的高比例 风电系统运行灵活性评估[ J] . 郑州大学学报( 工学 版) , 2021, 42(6) : 93-98.WANG J F, ZHANG H H, ZHU F Y. Evaluation of system operational flexibility of high proportion wind power system based on the typical scene set [ J ] . Journal of Zhengzhou University ( Engineering Science) , 2021, 42 (6) : 93-98.[3] 章健, 张玉晓, 熊壮壮, 等. 计及 DR 的新能源配电网 电压无功 协 调 优 化 [ J] . 郑 州 大 学 学 报 ( 工 学 版) , 2020, 41(2) : 61-66.ZHANG J, ZHANG Y X, XIONG Z Z, et al. Voltage reactive power coordination optimization of distributed new energy network considering DR[ J] . Journal of Zhengzhou University ( Engineering Science ) , 2020, 41 ( 2 ) : 61 -66.[4] ZHONG Q C, WEISS G. Synchronverters: inverters that mimic synchronous generators[ J] . IEEE Transactions on Industrial Electronics, 2011, 58(4) : 1259-1267.[5] XIONG L S, ZHUO F, WANG F, et al. Static synchronous generator model: a new perspective to investigate dynamic characteristics and stability issues of grid-tied PWM inverter[ J] . IEEE Transactions on Power Electronics, 2016, 31(9) : 6264-6280.[6] 邢鹏翔, 付立军, 王刚, 等. 改善微电网频率动态响 应的虚拟同步发电机强化惯量控制方法[ J] . 高电压 技术, 2018, 44(7) : 2346-2353.XING P X, FU L J, WANG G, et al. Control strategy of virtual synchronous generator with enhanced inertia for improving dynamic frequency response of microgrid [ J] . High Voltage Engineering, 2018, 44(7) : 2346-2353.[7] 柴伦, 李岚, 李冰, 等. 基于改进虚拟同步发电机的 预同步 并 网 策 略 [ J] . 可 再 生 能 源, 2019, 37 ( 7) : 1015-1020.CHAI L, LI L, LI B, et al. Strategy of pre-synchronized grid-connection based on improving virtual synchronous generator [ J] . Renewable Energy Resources, 2019, 37 (7) : 1015-1020.[8] 徐晓宁, 周雪松. 微网脱 / 并网运行模式平滑切换控 制策略[ J] . 高电压技术, 2018, 44(8) : 2754-2760.XU X N, ZHOU X S. Control strategy for smooth transfer between grid-connected and island operation for micro grid[ J] . High Voltage Engineering, 2018, 44(8) : 2754 -2760.[9] 柴秀慧, 张纯江, 赵晓君, 等. 基于自恢复下垂的分 布式电源主动同步控制及参数优化[ J] . 电力系统自 动化, 2020, 44(19) : 128-133.CHAI X H, ZHANG C J, ZHAO X J, et al. Self-recovery droop based active synchronization control and parameter optimization of distributed generator [ J ]. Automation of Electric Power Systems, 2020, 44(19): 128-133.[10] 魏亚龙, 张辉, 孙凯, 等. 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, 178.WEI Y L, ZHANG H, SUN K, et al. Pre-synchronization method of virtual synchronous generator using virtual power[ J] . Automation of Electric Power Systems, 2016, 40(12) : 124-129, 178.[11] 颜湘武, 王德胜, 贾焦心. 基于分散式微电网的虚拟 同步发电机无通信预同步并网方案[ J] . 电工技术学 报, 2019, 34(19) : 4143-4153.YAN X W, WANG D S, JIA J X. Non-communication pre-synchronization scheme of VSGs based on decentralized microgrids[ J] . Transactions of China Electrotechnical Society, 2019, 34(19) : 4143-4153.[12] 聂志强, 梁晖, 罗浩, 等. 基于非线性下垂控制的单 模式微 网 并 / 离 网 无 缝 切 换 技 术 [ J ] . 电 网 技 术, 2016, 40(5) : 1371-1378.NIE Z Q, LIANG H, LUO H, et al. Single mode gridconnected / islanded microgrid seamless transition based on nonlinear droop control technology [ J ] . Power System Technology, 2016, 40(5) : 1371-1378.[13] 耿昊翔, 王维俊, 唐帅, 等. 基于无锁相环的虚拟同 步发电机离并网切换控制策略研究[ J] . 电机与控制 应用, 2021, 48(9) : 90-95.GENG H X, WANG W J, TANG S, et al. Research on off-grid / on-grid switching control strategy of virtual syn- chronous generator without PLL[ J] . Electric Machines & Control Application, 2021, 48(9) : 90-95.[14] 王浩, 郝正航, 陈卓, 等. 基于虚拟同步发电机的储 能逆变器控制策略及无缝切换技术[ J] . 科学技术与 工程, 2022, 22(9) : 3594-3600.WANG H, HAO Z H, CHEN Z, et al. Control strategy and seamless switching technology of energy storage inverter based on virtual synchronous generator [ J]. Science Technology and Engineering, 2022, 22(9): 3594-3600.[15] 施永, 赖纪东, 苏建徽, 等. 微网系统运行模式平滑 切换控制策略[ J] . 电力系统自动化, 2016, 40( 8) : 85-91.SHI Y, LAI J D, SU J H, et al. Control strategy of seamless transfer for microgrid operation mode[ J] . Automation of Electric Power Systems, 2016, 40(8) : 85-91.[16] 宋琼, 张辉, 孙凯, 等. 多微源独立微网中虚拟同步 发电机的改进型转动惯量自适应控制[ J] . 中国电机 工程学报, 2017, 37(2) : 412-424.SONG Q, ZHANG H, SUN K, et al. Improved adaptive control of inertia for virtual synchronous generators in islanding micro-grid with multiple distributed generation units [J]. Proceedings of the CSEE, 2017, 37(2): 412-424.[17] 邢鹏翔, 贾璇悦, 许长清, 等. VSG 低电压穿越的特 性分析及控制方法研究[ J] . 电网与清洁能源, 2022, 38(8) : 130-137, 143.XING P X, JIA X Y, XU C Q, et al. A study on characteristic analysis and control methods of low voltage ride through for the VSG[ J] . Power System and Clean Energy, 2022, 38(8) : 130-137, 143.[18] LI D D, ZHU Q W, LIN S F, et al. A self-adaptive inertia and damping combination control of VSG to support frequency stability [ J ] . IEEE Transactions on Energy Conversion, 2017, 32(1) : 397-398.[19] 于晶荣, 孙文, 于佳琪, 等. 基于惯性自适应的并网 逆变器虚拟同步发电机控制[ J] . 电力系统保护与控 制, 2022, 50(4) : 137-144.YU J R, SUN W, YU J Q, et al. Virtual synchronous generator control of a grid-connected inverter based on adaptive inertia [ J] . Power System Protection and Control, 2022, 50(4) : 137-144.[20] WU H, RUAN X B, YANG D S, et al. Small-signal modeling and parameters design for virtual synchronous generators[ J] . IEEE Transactions on Industrial Electronics, 2016, 63(7) : 4292-4303.
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Last Update:
2023-05-09