| 引用本文: | 刘正富,王 朋,郭敬梅,等.基于MMC的风电机组低电压穿越测试装置控制策略研究[J].电力系统保护与控制,2021,49(19):38-47.[点击复制] |
| LIU Zhengfu,WANG Peng,GUO Jingmei,et al.wind turbine; low-voltage ride through; modular multilevel converter; voltage dip; test device[J].Power System Protection and Control,2021,49(19):38-47[点击复制] |
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| 基于MMC的风电机组低电压穿越测试装置控制策略研究 |
| 刘正富1,2,王朋1,郭敬梅2,赵伟1,朱良合2,区文俊2,苏雷涛1,吴小可2 |
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| (1.广东电网有限责任公司电力科学研究院，广东 广州 510080;
2.广东电科院能源技术有限责任公司，广东 广州 510080) |
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| 摘要: |
| 电力电子型风电机组低电压穿越(Low Voltage Ride Through, LVRT)测试装置具有控制灵活、精度高、功能多样、对电网干扰小等优点。如何准确模拟标准要求的各种电网故障电压波形是该装置控制策略要解决的关键问题。为此，首先构造了三相短路和两相短路的虚拟故障电路，利用对称分量法，详细推导了以电压跌落百分比为输入条件的电网故障电压和短路阻抗比的解析表达式。其次，将电网故障电压作为LVRT测试装置的电压跌落指令参考值，通过闭环控制即可输出需要的测试电压波形。最后，结合基于模块化多电平换流器(Modular Multilevel Convener, MMC)的风电机组LVRT测试装置，给出了电网侧MMC和风机侧MMC的控制策略。在PSCAD/ETMDC中搭建了大容量风电机组低电压穿越测试装置仿真模型，通过LVRT测试中的2种典型工况仿真验证了该方法的有效性。 |
| 关键词: 风电机组 低电压穿越 模块化多电平变流器 电压跌落 测试装置 |
| DOI：DOI: 10.19783/j.cnki.pspc.201563 |
| 投稿时间：2020-11-17修订日期：2021-04-16 |
| 基金项目:中国南方电网有限责任公司重点科技项目(GDKJXM20193406) |
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| wind turbine; low-voltage ride through; modular multilevel converter; voltage dip; test device |
| LIU Zhengfu1,2,WANG Peng1,GUO Jingmei2,ZHAO Wei1,ZHU Lianghe2,OU Wenjun2,SU Leitao1,WU Xiaoke2 |
| (1. Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China;
2. Guangdong Electric Power Research Institute Energy Technology Co., Ltd., Guangzhou 510080, China) |
| Abstract: |
| The Low Voltage Ride Through (LVRT) test device of a wind turbine based on power electronics has the advantages of flexible control, high precision, diverse functions and low interference to the power grid. The key problem of the device’s control strategy is how to emulate different kinds of grid-fault voltage waveform as defined in standards. To this end, three-phase and two-phase virtual fault circuits are constructed first. By using the symmetrical component method, the analytical expressions of grid-fault voltage and short circuit impedance ratio of power grid with voltage drop percentage as an input condition are derived in detail. Secondly, the grid fault voltage is taken as the reference value of the voltage drop instruction of the LVRT test device, and the required test voltage waveform can be output through closed-loop control. Considering the LVRT test device of a wind turbine based on modular multilevel converter topology, the control strategy of MMCs connected to the grid and wind turbine separately is provided finally. A simulation model of the LVRT test device for large capacity wind turbines is built, and the effectiveness of the method is verified by simulation of two typical working conditions.
This work is supported by the Key Science and Technology Project of China Southern Power Grid Company Limited (No. GDKJXM20193406). |
| Key words: wind turbine low-voltage ride through modular multilevel converter voltage dip test device |
