| 引用本文: | 苗 淼,何 维,张祥成,王龙飞,周 翩,胡家兵.串联补偿线路对光伏发电系统稳定性影响[J].电力自动化设备,2016,36(9): |
| MIAO Miao,HE Wei,ZHANG Xiangcheng,WANG Longfei,ZHOU Pian,HU Jiabing.Influence of series compensation lines on PV system stability[J].Electric Power Automation Equipment,2016,36(9): |
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| 摘要: |
| 通过建立含串联补偿线路的无穷大电源-单光伏变换器系统的小信号分析模型，借鉴复转矩系数法，分析了不同串补度情况下串联补偿线路对电流控制与直流电压控制的影响，发现随着串补度的提高，电流控制的阻尼随之削弱，而直流电压控制则不受影响，对此分别给出了相应的物理解释。考虑到锁相环引起的负阻尼效应，发现串联补偿线路可能造成光伏变换器发生不稳定现象。在PSCAD／EMTDC电磁暂态仿真软件中搭建了详细的模型，并对仿真模型进行了模态分析，时域仿真结果和模态分析证实了文中所提观点。 |
| 关键词: 光伏 稳定性 串联补偿 直流电压控制 电流控制 变换器 锁相环 次同步振荡 |
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| 基金项目:国家电网公司总部科技项目（522830140003） |
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| Influence of series compensation lines on PV system stability |
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MIAO Miao1, HE Wei2, ZHANG Xiangcheng3, WANG Longfei2, ZHOU Pian2, HU Jiabing2
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1.School of Electrical Engineering and Information，Sichuan University，Chengdu 610065，China;2.State Key Laboratory of Advanced Electromagnetic Engineering and Technology，Huazhong University of Science and Technology，Wuhan 430074，China;3.Key Laboratory of Photovoltaic Grid Connection Technology of Qinghai Province，State Grid Qinghai Electric Power Company，Xining 810008，China
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| Abstract: |
| The small signal analysis model of an infinite bus system connected with a converter via series compensation lines is established and the complex torque coefficient method is applied to analyze the influence of series compensation lines on the current control and DC voltage control for different compensation degrees. It is found that，the damping of current control becomes weaker along with the increase of compensation degree while the DC voltage control is not impacted，for which the corresponding physical explanations are respectively given；the series compensation lines may cause the instability of PV converter due to the negative damping effect induced by the phase locked loops. A detailed model is built with PSCAD／EMTC and the time-domain simulation，together with the modal analysis，verifies the given conclusions. |
| Key words: stability series compensation DC voltage control electric current control electric converters phase locked loops sub-synchronous oscillation |
