正交分量动态生成的单相锁相环

Single-phase PLL With Dynamic Orthogonal Signal Generation

针对单相并网变流器的同步问题,为在获得零稳态误差的同时达到频率自适应的目的,结合Park变换的特点,提出一种用于同步单相电网信号的单相Park变换锁相环(PLL)。所提出的PLI同时具备对输入信号相位和频率的实时检测,并且使用动态正交分量生成模块,利用PLL的相位输出,通过查正弦表动态生成待锁相信号的正交分量,更适宜数字控制器实现。各种工况下的实验验证了所提出的单相Park变换PLL的可实现性,实验数据充分说明其在保证高精度相位输出的同时具备频率自适应特性。

Focuse on the synchronization of single-phase grid connected converters, a phase locked loop （PLL） is pro- posed to obtain frequency-adaptive property at the same high steady state accuracy.The proposed PLL is at the basis of three-phase Park transformation PLL.The orthogonal component generation distinguishes the proposed PLL from all existing ones.A dynamic orthogonal component generation block makes use of the phase output of the PLL to dynami- cally generate the orthogonal component of the locking signal with the help of sinusoidal table, which make it suitable for the digital processors.The proposed PLL is verified by experiments under various conditions, the results prove suf- ficiently that the proposed PLL achieves both high steady state accuracy and frequency-adaptive property.