Apparatus and method for controlling a plurality of power converting modules and apparatus and method for analyzing power quantity imbalance

摘要

Disclosed is a technology related to an apparatus for controlling or analyzing a power converting module, and more particularly, to a technology for improving imbalance of power quantities processed by a plurality of power converting modules. Relative power quantities processed by the modules are detected through a common circuit element installed in an input terminal or an output terminal shared by the plurality of modules, without detecting information acquired through current or voltage sensors individually installed in respective modules, and control values of the respective modules may be compensated for through the detected relative power quantities or may be output in a form where a user can easily identify them.

主权项

1. An apparatus for controlling three or more power converting modules, the power converting modules sharing a terminal and converting power by chopping the power by using a power semiconductor, and each of the power converting modules including a current sensor and a current controller that uses the current sensor, the apparatus comprising:
a sensing unit for measuring an electrical characteristic of a common circuit element, the electrical characteristic being at least one of current or voltage formed in the common circuit element, wherein each of the three or more power converting modules is associated with a predefined measurement time domain within a predetermined cycle, and the sensing unit measures the electrical characteristic of the common circuit element at the predefined measurement time domain for a given power converting module; and a compensator for distinguishing the electrical characteristic measured by the sensing unit at the predefined measurement time domains with a respective power converting module and compensating for an imbalance detected in the three or more power converting modules, wherein: the common circuit element is disposed between the terminal and the three or more power converting modules, the electrical characteristic varies based on an amount of current drawn by each of the three or more power converting modules, the compensator calculates a current quantity processed by each of the three or more power converting modules based on the electrical characteristic measured by the sensing unit, the compensator detects an imbalance degree of the current quantities processed by the three or more power converting modules according to a reference value, the compensator identifies an imbalanced power module from among the three or more power converting modules in response to detecting the imbalance degree of power based on the current quantities, and the compensator compensates for the imbalance by adjusting a current reference value for at least one of the three or more power converting modules such that the detected imbalance degree decreases, wherein the current controller of each of the three or more power converting modules compares the current reference value to a measured current value detected by the current sensor.