基于直流电压控制的新能源并网系统暂态电压稳定性分析

doi:10.19595/j.cnki.1000-6753.tces.250731

Abstract
Figure/Table
References (0)
Related Citation (8)

Download: PDF (2260 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The transient voltage stability issues in traditional power systems mainly focus on the transient stability of induction motors in receiving-end power grids. However, with the large-scale integration of renewable energy sources (RES) into the sending-end grid, the system also faces serious transient voltage instability problems during fault recovery process. At present, the numerical simulation methods are mostly utilized to analyze the influence of RES on the voltage drop during fault, and the transient voltage stability is analyzed by numerically calculating the time-domain integration of the voltage lower than 0.8 p.u., which is determined based on the engineering experience criteria. However, the voltage dynamics during fault recovery process is mainly determined by the voltage control mechanism of various equipments, the voltage stability of the system cannot be determined by the period of voltage recovery process. To avoid the misjudgment of the transient voltage stability of the RES integrated system, it is urgent to reveal the voltage instability mechanism considering the control strategies of RES. Therefore, based on the analogy of the transient instability process of synchronous generators, the transient voltage instability mechanism of RES under DC voltage control is revealed, the similarities and differences of transient voltage stability in RES integrated power systems and the traditional power system is sorted out. Afterwards, based on the quantitative analysis of boundaries for transient synchronous stability and transient voltage stability of RES integrated system, the transient stability dominance factor is proposed, and the rationality of the dominance of transient voltage stability in weak grids is demonstrated. Finally, the effectiveness of the proposed instability mechanism and analysis method is validated by electromagnetic transient simulations.
The following conclusions can be drawn from the simulation analysis:( 1) With the DC voltage control, the RES integrated system crosses the unstable equilibrium point under the unbalanced active power during fault. Then, the positive-feedback voltage control mechanism of RES is caused, which results in the continuous increase of the active current and continuous decrease of AC voltage, and the transient voltage instability of RES integrated system happens. (2) When the grid is strong and reactive power gain of RES is large enough, the unbalanced active power during fault is relatively small, the increase of the active current is retarded, and the transient voltage stability of the system is improved. Moreover, increasing the proportional gain of DC voltage controller can enhance the system’s ability to respond the unbalanced power and provide additional braking effect. However, considering the lagging of integrator for DC voltage controller, increasing the integration gain will lead to the decrease of deceleration area of the system, and the transient voltage stability of the system is deteriorated. (3) The RES integrated system faces the transient synchronous instability and transient voltage instability risks simultaneously, and the transient voltage instability issue must be considered first when the grid is weak and the reactive power support of RES is insufficient. (4) The active power output by the RES during fault recovery process is increased with the decrease of PLL control bandwidths, and the transient voltage stability of the RES integrated system is improved after considering the PLL dynamics. Therefore, a conservative evaluation result is derived in this paper due to the neglect of PLL dynamics.

Key words： RES integrated power systems transient voltage stability DC voltage control transient voltage stability boundary transient stability dominance factor

Received: 30 April 2025

PACS:

TM712

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Liu Xinyu
	Shan Yongpeng
	Xin Huanhai
	Zheng Di

Cite this article:

Liu Xinyu,Shan Yongpeng,Xin Huanhai等. Transient Voltage Stability Analysis of Voltage Source Converters Integrated System under DC Voltage Control[J]. Transactions of China Electrotechnical Society, 0, (): 250731-.

URL:

https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250731 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/250731

[1] 王晓辉, 党崇阳, 刘峻宇, 等. 功率因数映射负荷正反馈不稳定域的暂态电压失稳判别[J/OL]. 电工技术学报, 2024: 1-12. (2024-12-03). https://link.cnki.net/doi/10.19595/j.cnki.1000-6753.tces.241494.
Wang Xiaohui, Dang Chongyang, Liu Junyu, et al. Transient voltage instability identification based on positive-feedback unstable region mapped by power factor during load dynamics[J/OL]. Transactions of China Electrotechnical Society, 2024: 1-12. (2024-12-03). https://link.cnki.net/doi/10.19595/j.cnki.1000-6753.tces.241494.
[2] 叶萌, 谭锡林. 基于实时分类负荷模型的受端电网电压稳定问题研究[J]. 电气技术, 2019, 20(1): 53-57.
Ye Meng, Tan Xilin.Voltage stability research of receiving-end network based on real-time classification load model[J]. Electrical Engineering, 2019, 20(1): 53-57.
[3] Machowski J, Bialek J W, Bumby J R. Power System Dynamics.Stability and Control[M]. 2nd ed. New York: Wiley, 2012.
[4] PACworld. Blackout watch - Issue 056 June 2021.[EB/OL]. https://www.pacw.org/blackout-watch-issue-056-june-2021.
[5] 杨金洲, 李业成, 熊鸿韬, 等. 新能源接入的受端电网暂态电压失稳高风险故障快速筛选[J]. 电工技术学报, 2024, 39(21): 6746-6758.
Yang Jinzhou, Li Yecheng, Xiong Hongtao, et al.A fast screening method for the high-risk faults with transient voltage instability in receiving-end power grids interconnected with new energy[J]. Transactions of China Electrotechnical Society, 2024, 39(21): 6746-6758.
[6] Chen Junru, Milano F, O’Donnell T. Assessment of grid-feeding converter voltage stability[J]. IEEE Transactions on Power Systems, 2019, 34(5): 3980-3982.
[7] 王奕鑫, 唐宇, 叶琳, 等. 多馈入直流系统电压稳定中静态负荷影响的定量分析和评估方法[J]. 电工技术学报, 2024, 39(23): 7379-7393.
Wang Yixin, Tang Yu, Ye Lin, et al.Quantitative analysis and evaluation method for the impact of static loads on voltage stability in multi-infeed direct current systems[J]. Transactions of China Electrotechnical Society, 2024, 39(23): 7379-7393.
[8] 徐艳春, 蒋伟俊, 孙思涵, 等. 含高渗透率风电的配电网暂态电压量化评估方法[J]. 中国电力, 2022, 55(7): 152-162.
Xu Yanchun, Jiang Weijun, Sun Sihan, et al.Quantitative assessment method for transient voltage of distribution network with high-penetration wind power[J]. Electric Power, 2022, 55(7): 152-162.
[9] 徐艳春, 蒋伟俊, 汪平, 等. 考虑暂态电压稳定的含高渗透率风光的电网动态无功规划方法[J]. 电力自动化设备, 2022, 42(8): 79-88.
Xu Yanchun, Jiang Weijun, Wang Ping, et al.Dynamic reactive power planning method for power grid with high permeability wind power and photovoltaic considering transient voltage stability[J]. Electric Power Automation Equipment, 2022, 42(8): 79-88.
[10] Xu Yan, Dong Zhao yang, Meng Ke, et al. Multi-objective dynamic VAR planning against short-term voltage instability using a decomposition-based evolutionary algorithm[J]. IEEE Transactions on Power Systems, 2014, 29(6): 2813-2822.
[11] 郑乐, 胡伟, 闵勇, 等. 基于临界转变理论的电力系统电压稳定分析与预警[J]. 中国电机工程学报, 2016, 36(24): 6820-6827, 6937.
Zheng Le, Hu Wei, Min Yong, et al.Research on power systems voltage stability assessment and prediction based on critical transition[J]. Proceedings of the CSEE, 2016, 36(24): 6820-6827, 6937.
[12] 高金. 基于Dpeak等值建模的风电并网暂态电压稳定性分析[D]. 兰州: 兰州理工大学, 2021.
Gao Jin.Transient voltage stability analysis of wind power grid connected based on dpeak equivalent modeling[D]. Lanzhou: Lanzhou University of Technology, 2021.
[13] Wang Guoteng, Xu Zheng, Zhang Zheren.Voltage stability analysis of power systems with a large number of non-synchronous machine sources connected[J]. International Journal of Electrical Power & Energy Systems, 2021, 131: 107087.
[14] Kawabe K, Tanaka K.Impact of dynamic behavior of photovoltaic power generation systems on short-term voltage stability[J]. IEEE Transactions on Power Systems, 2015, 30(6): 3416-3424.
[15] 程慧婕, 帅智康, 彭也伦, 等. 含异步机负荷的虚拟同步机并联系统暂态电压稳定性分析及其提升措施研究[J]. 中国电机工程学报, 2021, 41(14): 4787-4798.
Cheng Huijie, Shuai Zhikang, Peng Yelun, et al.Study on transient voltage stability and improvement measures of paralleled virtual synchronous generators system with induction motors[J]. Proceedings of the CSEE, 2021, 41(14): 4787-4798.
[16] Fang Jingyang, Si Wenjia, Xing Lantao, et al.Analysis and improvement of transient voltage stability for grid-forming converters[J]. IEEE Transactions on Industrial Electronics, 2024, 71(7): 7230-7240.
[17] 国家质量监督检验检疫总局, 中国国家标准化管理委员会. 风电场接入电力系统技术规定: GB/T 19963—2011[S]. 北京: 中国标准出版社, 2012.
[18] 刘昕宇, 史兴华, 辛焕海, 等. 故障恢复期间新能源多场站系统过电压快速评估方法[J]. 电力系统自动化, 2023, 47(13): 168-175.
Liu Xinyu, Shi Xinghua, Xin Huanhai, et al.Fast assessment method for overvoltage in multiple renewable energy station system during fault recovery process[J]. Automation of Electric Power Systems, 2023, 47(13): 168-175.
[19] 周双喜, 朱凌志, 郭锡玖, 等. 电力系统电压稳定性及其控制[M]. 北京: 中国电力出版社.
[20] Ma Shaokang, Geng Hua, Liu Lu, et al.Grid-synchronization stability improvement of large scale wind farm during severe grid fault[J]. IEEE Transactions on Power Systems, 2018, 33(1): 216-226.
[21] He Xiuqiang, Geng Hua, Xi Jiangbei, et al.Resynchronization analysis and improvement of grid-connected VSCs during grid faults[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021, 9(1): 438-450.
[22] Göksu Ö, Teodorescu R, Bak C L, et al.Instability of wind turbine converters during current injection to low voltage grid faults and PLL frequency based stability solution[J]. IEEE Transactions on Power Systems, 2014, 29(4): 1683-1691.
[23] Hu Pengfei, Chen Zheng, Yu Yanxue, et al.On transient instability mechanism of PLL-based VSC connected to a weak grid[J]. IEEE Transactions on Industrial Electronics, 2023, 70(4): 3836-3846.
[24] Li Yujun, Tang Yingyi, Lu Yiyuan, et al.Synchronization stability of grid-connected VSC with limits of PLL[J]. IEEE Transactions on Power Systems, 2023, 38(4): 3965-3976.
[25] 艾力西尔·亚尔买买提, 辛焕海, 黄林彬, 等. 变流器跟踪性能-抗扰性能-经济代价间的矛盾三角关系[J/OL]. 中国电机工程学报, 2025: 1-12. (2025-02-24). https://kns.cnki.net/kcms/detail/detail.aspx?dbcode=CJFD&dbname=CJFD&filename=ZGDC20250221001.
YAERMAIMAITI Ailixier;XIN Huanhai;HUANG Linbin;FU Qiang;JU Ping;YIN Bo;ZHANG Lidong. Trade-off triangle of tracking performance, anti-interference performance, and economic cost of grid-connected converters[J/OL]. Proceedings of the CSEE,2025: 1-12. (2025-02-24). https://kns.cnki.net/kcms/detail/detail.aspx?dbcode=CJFD&dbname=CJFD&filename=ZGDC20250221001.