| 摘要 |
<p>An electrical power converter (10) includes both DC and AC power terminals (26,27; 19) which are respectively connected to a DC current source (42) and an AC voltage source (16), the latter comprising the grid of an AC power utility. A capacitor (24) is coupled to the AC terminals along with a load (22). A control and gating circuit (30) is coupled to the converter for supplying control signals for the thyristors (11) of a converter bridge included in the polyphase converter. When disconnected (at 20) from the utility grid, a relatively fast acting control loop (44) is coupled to the control and gating circuit and is responsive to the current flowing in the capacitor and an AC reference voltage (at 52) to accommodate the current source characteristics of the converter for maintaining an output voltage of substantially constant amplitude across the AC terminals. A second and relatively slower acting control loop (46) is also coupled to the control and gating circuit via the fast acting control loop and is responsible to the AC voltage across the capacitor and the load for providing regulation of the voltage across the AC terminals during steady state operation. <IMAGE></p> |
