液压型风力发电机组的转速和转矩解耦控制

摘要/Abstract

摘要： 以液压型风力发电机组为研究对象，输出高质量电能为研究目标，针对机组存在的转速和转矩解耦问题展开研究。建立定量泵-变量马达液压传动系统数学模型。从液压传动系统出发，探究影响机组电能输出质量的关键因素，分析该多输入-多输出系统存在的耦合问题，并采用前馈解耦补偿控制方法解耦。分析变量马达和比例节流阀对液压系统输出转速与转矩的控制规律，得到基于高电能质量控制的转速和转矩解耦控制器。以30kVA液压型风力发电机组半物理仿真实验台为基础，针对提出的控制方法展开研究。仿真和实验结果表明：液压型风力发电机组输出的转速和转矩实现了解耦控制，有效地实现了液压传动系统的稳速控制和传输功率波动的平滑控制。研究结果为液压型风力发电机组高质量电能输出控制和电网友好性能提高奠定了基础。

关键词: 风力发电, 液压传动, 稳速控制, 功率平滑, 解耦控制

Abstract: Taking a hydraulic wind turbine as the research object, the high power quality output as a goal, the decoupling control of the speed and torque in the unit was conducted.The mathematical models for the hydraulic transmission system fixed displacement pump-variable motor were established. Based on the hydraulic transmission system, the key factors affecting the quality of the unit electric energy output were explored, the coupling problem of the multiinput-multioutput system was analysed, and the control method of feed-forward decoupling compensation was used to decouple. The control laws of variable motor and proportional throttle valve to the output speed and output power of the hydraulic system were analysed, and the speed and torque decoupling controller was obtained based on high power quality in hydraulic wind turbine. Taking a 30kVA hydraulic wind turbine semi-physical simulation platform as the simulation and experimental platform, the proposed control method was researched. Simulation analyses and experimental results show that the decoupling control of output speed and torque in hydraulic wind turbine is realized, and the steady speed control of hydraulic transmission system and the smoothing control of transmission power fluctuation may be achieved effectively. The results lay the foundation for the control of high quality electric power output and the improvement of the grid friendly performance in the hydraulic wind turbine.

Key words: wind power, hydraulic transmission, constant speed output, power smoothing, decoupling control

中图分类号:

TH137

张寅, 孔祥东, 陈立娟, 艾超, 李昊. 液压型风力发电机组的转速和转矩解耦控制[J]. 中国机械工程.

Zhang Yin, Kong Xiangdong, Chen Lijuan, Ai Chao, Li Hao. Decoupling Control of Speed and Torque of a Hydraulic Wind Turbine[J]. China Mechanical Engineering.

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