Reactive power coordination control strategy for sending-end hybrid cascaded HVDC transmission system with high proportion of wind power integration

doi:10.3969/j.issn.2097-0706.2024.11.010

Abstract

Abstract:

Compared with traditional line commutated converter-based high voltage direct current （LCC-HVDC） transmission systems， the sending-end hybrid cascaded transmission system offers higher flexibility and strong adaptability to weak grids. However， as the proportion of renewable energy increases and the output from renewable energy bases becomes more unpredictable， the sending-end system faces challenges with poor voltage quality. Using static voltage sensitivity coefficients， the impact of the sending-end hybrid cascaded transmission system on the static voltage stability of the sending-end AC bus was analyzed. To improve voltage quality at the sending-end AC bus under high wind power scenarios， a reactive power coordination control strategy was designed for the hybrid cascaded system. This strategy combined a reactive power supplementary control strategy based on the modular multi-level converter （MMC） with a DC voltage supplementary control strategy， further stabilizing the AC bus voltage even when the reactive support capacity of the MMC was limited. A simulation model of the sending-end hybrid cascaded transmission system was built on the PSCAD/EMTDC simulation platform to validate the proposed coordination control strategy， demonstrating its effectiveness in regulating the sending-end AC bus voltage and enhancing voltage quality in the sending-end AC system.

Key words: renewable energy, hybrid cascaded DC system, reactive power coordination control, static voltage sensitivity coefficient, modular multi-level converter, line commutated converter

CLC Number:

TK01：TM72

SHI Shengyao, JIANG Minglei, ZHANG Heyi, MA Kerui, WANG Ziqiang, MA Zhiqiang. Reactive power coordination control strategy for sending-end hybrid cascaded HVDC transmission system with high proportion of wind power integration[J]. Integrated Intelligent Energy, 2024, 46(11): 83-91.

Figures/Tables 9

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参数		数值
送端系统	额定直流功率（单极）P_dc/MW	1 600
	直流额定电压（单极）U_dc/kV	800
	交流母线额定电压U_c/kV	525
	送端电网等效电抗X_s（标幺值）	0.4
	风电占比κ	0.7
	风机并网等效电抗X_w（标幺值）	0.5
LCC	额定直流电压U_dcLCC/kV	400
	变压器变比	525/180
	变压器漏抗（标幺值）	0.15
MMC	额定直流电压/kV	400
	半桥子模块数量	180
	子模块电容/mF	15
	桥臂电抗/mH	40
	变压器变比	525/220