高比例风电接入的送端混合级联直流输电系统无功协调控制策略

doi:10.3969/j.issn.2097-0706.2024.11.010

摘要/Abstract

摘要：

与传统的基于电网换相换流器的高压直流输电（LCC-HVDC）系统相比，送端混合级联输电系统具有灵活性高、弱网适应性强等特点。但随着新能源占比的不断提高以及新能源基地出力的不确定性，送端系统面临电压质量较差的问题。根据静态电压灵敏度系数分析了送端混合级联输电系统对送端交流母线静态电压稳定性的影响，为提高高比例风电送出场景下送端交流母线的电压质量，设计了基于模块化多电平换流器（MMC）的无功功率附加控制策略与直流电压附加控制策略相配合的混合级联系统无功协调控制策略，可在MMC无功支撑能力有限的情况下进一步稳定交流母线电压。基于PSCAD/EMTDC仿真平台搭建送端混合级联输电系统仿真模型，验证了所提协调控制策略能够有效调控送端交流母线电压，提高送端交流系统电压质量。

关键词: 新能源, 混合级联直流系统, 无功协调控制, 静态电压灵敏度系数, 模块化多电平换流器, 电网换相换流器

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

中图分类号:

TK01：TM72

时圣尧, 姜明磊, 张贺一, 马克睿, 王自强, 马志强. 高比例风电接入的送端混合级联直流输电系统无功协调控制策略[J]. 综合智慧能源, 2024, 46(11): 83-91.

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.

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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