Analytical Analysis on the Active Power Control Stability of the Weak Grids-connected VSC

被引：0

作者：

Wu G. ^{[1
]}

Wang S. ^{[1
]}

Zhou X. ^{[1
]}

Zhao B. ^{[1
]}

Liang J. ^{[2
]}

Li Y. ^{[1
]}

Wang T. ^{[1
]}

机构：

[1] State Key Laboratory of Power Grid Safety and Energy Conservation(China Electric Power Research Institute), Haidian District, Beijing

[2] Cardiff University, Cardiff

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 21期

关键词：

Analytic transfer function; Multi-input multi-output(MIMO); Outer loop control; Phase-locked loop(PLL); Single input single output(SISO); Weak grids;

D O I：

10.13334/j.0258-8013.pcsee.190232

中图分类号：

学科分类号：

摘要：

First of all, the analytical multi-input multi-output(MIMO) transfer function model of the weak grids-connected VSC was derived in consideration of the AC system strength and the effect of the phase-locked loop(PLL). Then, a novel method was proposed to simplify the MIMO model to a single-input single-output(SISO) model by setting one reference to zero. Then, the SISO open loop transfer function GPC0 of the active power control(APC) can be rearranged as the products of an ideal transfer function GPC0_1 and a modulation function GPC0_2. The GPC0_1 presents the impact of the APC of the infinite system-connected VSC, while the GPC0_2 presents impacts of the AC system strength, the active power, the PLL's bandwidth and the AC voltage control's bandwidth. The APC stability of the weak grids-connected VSC can be analyzed by studying the impact of the modulation transfer function on the phase margin of the ideal transfer function. The phenomenon that the system is more likely to lose stability when the PLL and the APC have adjacent bandwidths in weak grids condition, was explained. The impacts of the AC system strength, the active power and the AC-voltage control's bandwidth on system stability are also investigated. The theoretical analysis was validated by simulation results. © 2019 Chin. Soc. for Elec. Eng.

引用

页码：6169 / 6182

页数：13

共 28 条

[1] Zhou X., Lu Z., Liu Y., Et al., Development models and key technologies of future grid in China, Proceedings of the CSEE, 34, 29, pp. 4999-5008, (2014)
[2] Rao H., Architecture of Nan'ao multi-terminal VSC-HVDC system and its multi-functional control, CSEE Journal of Power and Energy Systems, 1, 1, pp. 9-18, (2015)
[3] Han M., Xu D., Wan L., Hierarchical optimal power flow control for loss minimization in hybrid multi-terminal HVDC transmission system, CSEE Journal of Power and Energy Systems, 2, 1, pp. 40-46, (2016)
[4] Tang G., Luo X., Wei X., Multi-terminal HVDC and DC-grid technology, Proceedings of the CSEE, 33, 10, pp. 8-17, (2013)
[5] Du W., Bi J., Wang T., Et al., Impact of grid connection of large-scale wind farms on power system small-signal angular stability, CSEE Journal of Power and Energy Systems, 1, 2, pp. 83-89, (2015)
[6] Deng N., Wang P., Zhang X., Et al., A DC current flow controller for meshed modular multilevel converter multiterminal HVDC grids, CSEE Journal of Power and Energy Systems, 1, 1, pp. 43-51, (2015)
[7] Durrant M., Werner H., Abbott K., Model of a VSC HVDC terminal attached to a weak AC system, Proceedings of 2003 IEEE Conference on Control Applications, pp. 178-182, (2003)
[8] Wu F., Zhang X.P., Godfrey K., Et al., Small signal stability analysis and optimal control of a wind turbine with doubly fed induction generator, IET Generation, Transmission & Distribution, 1, 5, pp. 751-760, (2007)
[9] Liao K., He Z., Sun B., Small signal model for VSC-HVDC connected DFIG-based offshore wind farms, Journal of Applied Mathematics, 2014, (2014)
[10] Yang J., Liu K., Wang D., Et al., Small signal stability analysis of VSC-HVSC applied to passive network, Proceedings of the CSEE, 35, 10, pp. 2400-2408, (2015)

← 1 2 3 →