CAJ | 학술논문

电压源型换流器通常在同步旋转dq坐标系中建立控制系统模型。在此控制系统中，锁相环用于跟踪电网电压频率和相位变化，其跟踪精度决定了控制系统的动稳态性能。本文摒弃以往在dq坐标系建立控制器的方法，提出一种新的无锁相环的模块化多电平换流器控制策略，其中外环采用PI调节器，内环在两相静止αβ坐标系中采用PCI调节器。该控制策略无需知道电感的参数，而且不需锁相环也能实现零稳态误差地跟踪参考给定值。
전압원형환류기통상재동보선전dq좌표계중건립공제계통모형。재차공제계통중，쇄상배용우근종전망전압빈솔화상위변화，기근종정도결정료공제계통적동은태성능。본문병기이왕재dq좌표계건립공제기적방법，제출일충신적무쇄상배적모괴화다전평환류기공제책략，기중외배채용PI조절기，내배재량상정지αβ좌표계중채용PCI조절기。해공제책략무수지도전감적삼수，이차불수쇄상배야능실현령은태오차지근종삼고급정치。
Voltage source converter usually adopts dq synchronous rotating frame to establish control system model. The phase lock loop ( PLL) in the control system is used to track the changes of grid voltage and phase position, and its tracking performance determines the transient and steady performance of the control system. Instead of developing the controller in dq synchronous frame, this paper proposes a novel control strategy for modular multilevel converter without PLL, which uses PI regulator in outer loop and PCI regulator in stationaryαβcoordinate frame in inner loop. The proposed control strategy also can achieve zero steady-state error tracking for the given reference value without in-ductance value or PLL needed.