永磁直驱式风力发电机三相不平衡的补偿控制算法

提出了一种用于电网侧三相电压不平衡情况下的永磁直驱式风力发电机的逆变控制算法。通过对不平衡三相瞬时电压的矢量变换、分解并形成负序电流分量，与通过锁相环单位归一化的逆变输出电流相加，可以保证永磁直驱式风力发电机逆变输出的电流具有良好的正弦及三相平衡特性。该控制算法解决了永磁直驱式风力发电机在电网侧三相电压不平衡情况下的输出畸变问题，算法简单有效，计算量小，硬件采用分立元件即可实现，方便且可靠。

Compensation Control Algorithm for Direct Drive Permanent Magnet Wind Generator under Unbalance of Three-Phase Source Voltage

This paper presents a new converter control algorithm for the direct drive permanent magnet wind generator under the unbalanced three phase source voltage. Based on the vector transform algorithm of the unbalanced three phase instantaneous voltage, the negative sequence current is decomposed and is added to the output current that is calculated based on PLL. The control strategy can guarantee that the output currents of the direct drive permanent magnet wind generator are sinusoidal and three phase balanced. The proposed algorithm overcomes the problem that the outputs of the direct drive permanent magnet wind generator are distorted when the source voltages are unbalanced. The proposed control strategy is simple and available, with less computational efforts. Moreover, it can be realized on separated components in hardware expediently with high reliability.