| 引用本文: | 李文勋,车延博,洪潮,张野,杨健.考虑输电损耗和新能源波动的VSC-MTDC下垂控制策略[J].电力自动化设备,2017,37(8): |
| LI Wenxun,CHE Yanbo,HONG Chao,ZHANG Ye,YANG Jian.VSC-MTDC droop control strategy considering transmission loss and renewable energy fluctuation[J].Electric Power Automation Equipment,2017,37(8): |
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| 摘要: |
| 输电线路上功率传输引起的电压降使各个换流站的直流电压存在差异，具有随机性的新能源接入也会带来系统直流电压波动。这两方面的原因会使换流站输出功率发生偏移，从而影响多端直流输电(MTDC)系统的潮流控制。对此提出一种考虑输电损耗和新能源波动的MTDC下垂控制策略，该控制策略根据潮流分析的结果为换流站指定运行参考点，对主换流站和从换流站分别增加电压闭环和功率闭环，形成带电压死区和带功率死区的下垂控制，以补偿新能源接入带来的影响，同时根据换流站容量和系统电压范围指定下垂系数。通过仿真表明，该策略在正常运行状态下能够削弱新能源波动对从换流站输出功率的影响；在大扰动状态下能够为换流站合理分配波动功率，具有良好的调压性能。 |
| 关键词: 多端直流输电 电压源型换流器 下垂控制 潮流分析 电压死区 功率死区 |
| DOI：10.16081/j.issn.1006-6047.2017.08.030 |
| 分类号:TM761;TM721.1 |
| 基金项目:国家重点研发计划资助项目(2016YFB0900200)；南方电网重点科技项目(CSGTRC-K163001) |
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| VSC-MTDC droop control strategy considering transmission loss and renewable energy fluctuation |
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LI Wenxun1, CHE Yanbo1, HONG Chao2, ZHANG Ye2, YANG Jian2
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1.Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China;2.Electric Power Research Institute, China Southern Power Grid Co.,Ltd.,Guangzhou 510080, China
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| Abstract: |
| The voltage drop caused by the power transmission on line makes the DC voltages of different convertor stations different and the integration of random renewable energy may also induce the DC voltage fluctuation, which shifts the output power of convertor station and influences the power-flow control of MTDC (Multi-Terminal HVDC) system. A droop control strategy considering transmission loss and renewable energy fluctuation is proposed for MTDC system, which assigns the operating point references for different convertor stations according to the results of power flow analysis, adds a closed voltage loop and a closed power loop to the droop controls of master and slave stations respectively to improve the droop control with voltage dead-band and power dead-band for compensating the renewable energy fluctuation, and determines the droop coefficients according to the convertor station capacity and system voltage range. Simulative results show that, with the proposed control strategy, the influence of renewable energy fluctuation on the power output of slave station is reduced in normal operating conditions and the fluctuated power is properly distributed among the stations in large disturbance condition with good voltage regulation performance. |
| Key words: MTDC VSC droop control power flow analysis voltage dead-band power dead-band |
