宽转速范围永磁同步发电机电流矢量控制

为了实现永磁同步发电机(PMSG)在宽转速范围内和变负载条件下的高性能稳压控制,提出一种基于PWM整流器的PMSG电流矢量控制策略。PMSG输出的不稳定交流电经过PWM整流器变换成稳定的直流电,这样的直流发电系统具有高功率密度、高效率和能量、可双向流动等优点。所述的电流矢量控制策略,具体是在PMSG低速时采用最大转矩/电流比(MTPA)控制,中高速时通过一个电压外环实时补偿d轴弱磁电流,使得PMSG系统能够根据转速和负载变化及时地分配和控制d、q轴电流。仿真和实验结果验证了该控制策略的正确性和有效性,实现系统在宽转速范围的高性能稳压输出。

Current vector control of permanent magnet synchronous generator for wide-speed-range operation

In order to realize high-performance voltage stabilization of the wide-speed-range permanent magnet synchronous generator(PMSG)under variable load,a current vector control strategy for the PWM rectifier-based PMSG system was proposed.The unstable AC output of the PMSG was transformed into stable DC voltage through the PWM rectifier.Such a DC power generation system has the advantages of high power density,high efficiency and bidirectional power flow.The maximum torque per ampere(MTPA)control strategy was employed at low speed,whilst a field-weakening d-axis current was achieved upon the voltage closed-loop at medium and high speed.Thus,the d-q axis currents are properly regulated under different speed and load conditions.Simulation and experimental results verify the correctness and effectiveness of the control strategy,and the high performance which rectifies control over a wide speed range is realized.