| 摘要 |
There is provided a voltage source converter (30) comprising: a plurality of terminals (32, 34, 42); a plurality of switching elements and a plurality of energy storage devices connected between the plurality of terminals (32, 34, 42), each energy storage device for storing and releasing energy to provide a voltage, the plurality of switching elements arranged to be switchable to control flow of current through each energy storage device; and a controller (62) programmed to operate in an energy regulation mode to: (i) designate one or more of the plurality of energy storage devices as a or a respective first energy storage device, and designate one or more other of the plurality of energy storage devices as a or a respective second energy storage device; (ii) determine the amount of energy required to be absorbed or released by the or each first energy storage device to move towards or reach a target energy level; (iii) control the switching of the plurality of switching elements to force a current to flow through the or each second energy storage device so as to store a buffer of energy in the or each second energy storage device or release energy to provide energy storage capacity in the or each second energy storage device, wherein the stored buffer of energy or the provided energy storage capacity in the or each second energy storage device corresponds to the determined amount of energy required to be absorbed or released by the or each first energy storage device; and (iv) control the switching of the plurality of switching elements to force a common current to flow through the first and second energy storage devices so as to: transfer the stored buffer of energy from the or each second energy storage device to the or each first energy storage device; or transfer energy from the or each first energy storage device to the provided energy storage capacity of the or each second energy storage device. |
