传感误差对双馈风电机组MPPT控制策略的影响分析

Analysis of MPPT Control Strategy of Doubly fed Wind Turbine Generator System Being Affected by Sensor Error

建立了双馈风电机组的传动链、电气系统等部分数学模型,分析了一种基本的风电机组MPPT控制策略。从控制理论角度,重点分析传感误差对MPPT控制策略的影响,并提出一种误差补偿方案,以避免和消除传感误差对风电机组功率输出及系统内部运行状态造成的潜在危害。在Matlab/Simulink环境下,对容量为1.5 MW风电机组进行了传感误差影响仿真分析,结果表明:风轮转速误差每变化1%,发电机转矩变化0.174%左右,发电机功率变化1.4%左右;另外提出的误差补偿方案合理可行。

The mathematical model of drive chain and electrical system of the part of the doubly-fed wind turbine generator system （DFWTGS） was established. A basic maximum power point tracking （MPPT） control strategy was analyzed. From the point of control theory, the analysis of the impact of sensor error to MPPT control strategy was focused on, and proposed an error compensation scheme to avoid and eliminate the potential hazards caused by sensor error to wind turbine generator system output power and system internal operating state. Under Matlab/ Simulink environment, the capacity of 1.5 MW wind turbine generator system being affected by sensor error is taken for simulation analysis, the results show that： every 1% change of wind rotor speed error, the generator torque and power will change respectively about 0.174% and 1.4%： additionally, the proposed error compensation program is reasonable and feasible.