基于可变频变压器的风电机组功率解耦控制  

Power Decoupling Control of Wind Turbine Based on Variable Frequency Transformer

作　　者：袁伟轩 张宏 YUAN Weixuan;ZHANG Hong(Guangzhou Maritime University,Guangzhou 510725,China;Dongguan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Dongguan 523003,China)

机构地区：[1]广州航海学院,广东广州510725 [2]广东电网有限责任公司东莞供电局,广东东莞523003

出　　处：《电工技术》2022年第15期21-25,30,共6页Electric Engineering

摘　　要：在海上风电正朝着单机容量大型化方向发展,传统变流器难以满足大容量功率传输的背景下,针对传统基于背靠背变流器的风电机组,提出了基于可变频变压器的风电机组拓扑及其功率解耦控制策略。发电机组的控制策略主要包括电压频率闭环、有功功率闭环及无功功率闭环。通过频率环与有功功率环并联来调节可变频变压器中直流电机的电枢电压,并通过无功功率环来调节串联变压器的输出电压幅值,从而使发电机组并网点的有功无功解耦控制。仿真结果表明提出的发电机组拓扑所需的电力电子器件功率等级小,发电机组并网电流各次谐波含量低。Offshore wind power is developing towards large capacity,and the traditional converter is difficult to meet the high-capacity power transmission.Aiming at the traditional wind turbine based on back-to-back converter,the wind turbine topology and power decoupling control strategy based on variable frequency transformer is proposed in this paper.The control strategy of generator set mainly includes voltage frequency closed loop,active power closed loop and reactive power closed loop.The armature voltage of the DC motor in the variable frequency transformer is adjusted through the parallel connection of the frequency loop and the active power loop,and the output voltage amplitude of the series transformer is adjusted through the reactive power loop,so that the active and reactive power decoupling control of the grid-connected point of the generator set is achieved.The simulation results show that the power level of the power electronic devices required by the proposed generator set topology is small,and the harmonic content of each order of the grid-connected current of the generator set is low.

关 键 词：永磁同步发电机 可变频变压器 串联变压器 功率解耦控制 

分 类 号：TM46[电气工程—电器]