基于反馈线性化与非线性扰动补偿的液压型风电机组有功功率控制研究

Research on Active Power Control of Hydraulic Wind Turbines Based on Feedback Linearization and Nonlinear Disturbance Compensation

液压型风电机组并网后不能直接发电,需要对有功功率进行控制,而风能具有随机性和波动性,导致该系统具有时变性和非线性,故需解决外部扰动下风机有功功率的精准控制。采用反馈线性化解决液压主传动系统非线性问题,采用非线性扰动观测器快速精准观测外部扰动对系统输出功率的影响,设计了不匹配扰动下的有功功率补偿控制器,精确补偿扰动对系统输出功率的影响,最终得到了液压型风电机组有功功率控制策略。基于30 kV·A液压型风电机组半物理模拟实验平台,使机组输出有功功率能够精准跟随目标转速变化,有功功率绝对误差为±0.05 kW,稳态误差在3%~5%范围内。

The hydraulic wind turbine could not directly generate electricity after being connected to the grid,it was necessary to control the active power.The wind energy had randomness and volatility.The system had time-varying and nonlinear characteristics,and it was necessary to solve the accurate control of the active power of the fans under external disturbances.The nonlinear problem of the hydraulic main drive system was solved by feedback linearization.The nonlinear disturbance observer was used to quickly and accurately observe the influences of external disturbances on the output power of the system.An active power compensation controller under mismatched disturbances was proposed to accurately compensate the influences of disturbances on the output power of the system,and the active power control strategies of the hydraulic wind turbine were obtained.Based on the semi-physical simulation experimental platform of 30 kV·A hydraulic wind turbine,the output active power of the unit may accurately follow the target speed changes.The absolute error of active power is as±0.05 kW,and the steady-state errors are within the range of 3%~5%.