| 引用本文: | 翟冬玲,韩民晓,马骏鹏,王鹏.连接低惯量系统的VSC-MTDC的自适应下垂控制[J].电力自动化设备,2019,39(2): |
| ZHAI Dongling,HAN Minxiao,MA Junpeng,WANG Peng.Adaptive droop control of VSC-MTDC connected to low inertia system[J].Electric Power Automation Equipment,2019,39(2): |
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| 摘要: |
| 对于连接低惯量交流系统的多端柔性直流输电(VSC-MTDC)系统，当系统发生大扰动时会造成频率变化，为了给交流系统提供虚拟惯量，在换流器控制系统中加入P-f下垂控制；为了进一步抑制频率波动，设计VSC-MTDC系统的自适应下垂控制，可以在更大程度上利用换流器容量，快速调节有功平衡，减小直流电压波动。在PSCAD/EMTDC仿真软件中建立三端模型，对比分析主从控制、下垂控制和自适应下垂控制对交流系统频率和直流电压的影响。仿真结果表明，加入了P-f下垂控制可以有效抑制交流系统频率变化，采用自适应下垂控制可以增强抑制的效果，减小直流电压波动，提高系统稳定性。 |
| 关键词: 低惯量系统 多端柔性直流输电 自适应下垂控制 稳定性 |
| DOI：10.16081/j.issn.1006-6047.2019.02.019 |
| 分类号:TM721.1 |
| 基金项目:国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)；国家留学基金委资助项目(2017067-30048) |
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| Adaptive droop control of VSC-MTDC connected to low inertia system |
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ZHAI Dongling1, HAN Minxiao1, MA Junpeng1, WANG Peng2
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1.State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.New Energies Sources Co.,Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
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| Abstract: |
| As for the VSC-MTDC(Voltage Source Converter based Multi-Terminal Direct Current) system connected to low inertia AC system, the frequency of the system may fluctuate when large disturbances happen. Therefore, the P-f droop control is introduced in the converter control to supply virtual inertia for AC system. In order to further suppress the frequency fluctuation, an adaptive droop control for VSC-MTDC is designed. This control method can take advantages of converter capacity to a large extent, adjust active power quickly and reduce DC voltage variation. Additionally, a three-terminal model is built in the PSCAD/EMTDC software to compare and analyze the impacts on frequency and DC voltage of master-slave control, P-f droop control and adaptive droop control. The simulative results show that the droop control based on P-f curve can suppress the frequency fluctuation effectively and the adaptive droop control can reinforce the suppression effect and decrease the voltage variation so as to improve the power system stability. |
| Key words: low inertia system VSC-MTDC power transmission adaptive droop control stability |
