| 摘要 |
PROBLEM TO BE SOLVED: To provide a system interconnection inverter capable of suppressing power swing of a power system based on a variation in the internal phase difference angle of a generator.SOLUTION: A control circuit 5 detects an effective power P and a reactive power Q at an interconnection point (a), and generates control target values i, iin a dq coordinate system on the basis of the deviation of each detection value P, Q for each control target value P, Q, and generates dq axis components i, iof the dq coordinate system from the output current i' of a three-phase inverter circuit 2. The control circuit 5 calculates each deviation of the dq axis components i, iof the dq coordinate system for the control target values i, i, and generates a PWM signal for controlling the three-phase inverter circuit 2 by using the calculation values. Upon occurrence of a variation &Dgr;ω in the angular frequency at the interconnection point (a), a power variation suppression unit 6 detects that variation &Dgr;ω, generates a suppression component &Dgr;iof the d-axis for suppressing variation in the effective power at the interconnection point (a) on the basis of the variation &Dgr;ω, and adds the suppression component &Dgr;ito the control target value i. |
