CAJ | 학술논문

为实现微网系统从孤岛运行模式到并网运行模式的平滑过渡，微网与主电网的同步是首要考虑的问题。提出了一种新型基于锁相环原理的主动同步控制策略，该方法通过主动调节微网母线电压的频率、相角和幅值跟踪主电网电压，从而减小并网时刻的电压偏差，达到孤岛模式向并网模式的平滑过渡。同时，采用电压矢量叉积作为鉴相器，微网频率和相角可同时快速有效地跟踪电网频率和相角。并且该方案不需传递相位等时域信号，仅需依赖于低带宽的通信，原理简单、易于实施。最后，实时硬件在环仿真与实验结果表明，该控制方案可实现微网快速平滑并网。
위실현미망계통종고도운행모식도병망운행모식적평활과도，미망여주전망적동보시수요고필적문제。제출료일충신형기우쇄상배원리적주동동보공제책략，해방법통과주동조절미망모선전압적빈솔、상각화폭치근종주전망전압，종이감소병망시각적전압편차，체도고도모식향병망모식적평활과도。동시，채용전압시량차적작위감상기，미망빈솔화상각가동시쾌속유효지근종전망빈솔화상각。병차해방안불수전체상위등시역신호，부수의뢰우저대관적통신，원리간단、역우실시。최후，실시경건재배방진여실험결과표명，해공제방안가실현미망쾌속평활병망。
To guarantee a smooth transition from islanded mode to grid-connected mode,synchronization is the first issue to be considered.In this paper,a phase locked loop (PLL)-based active synchronization control approach is presented,which is implemented in the secondary control level of the microgrid hierarchical control structure by actively controlling the microgrid voltage to track the main grid.In this way,it can reduce the voltage difference to get the microgrid back into grid in minimum transient state.With the cross product of voltage vectors employed as the phase detector,the microgrid voltage frequency and phase are enabled to track the main grid at the same time.In addition,instead of fast communication to transmit signals in the time domain,the proposed method only needs a low-bandwidth communication link,which is simple and easy to implement. Finally,hardware-in-the-loop simulation and experiment results show the feasibility of the approach proposed.