Modular Power Conversion System
AssigneeDEKA Products Limited Partnership
InventorsDonald J. Lucas, Christopher L. Barber, Xiaorong Xia
Life of this patent
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Abstract
A method for determining when a connection of a power system to a grid has been disconnected. The method includes the power system supplying a first amount of reactive power to the grid to which the power system is connected, and the power system determining if there is a frequency change within the grid. This includes if the frequency change does not exceed a predetermined threshold, the power system supplying a second amount of reactive power to the grid, and if the frequency exceeds a predetermined threshold, the power system supplying a first amount of reactive power to the grid.
Claims21
A method for determining when a connection of a power system to a grid has been disconnected comprising:
- the power system supplying a first amount of reactive power to the grid to which the power system is connected;
- and
- the power system determining if there is a frequency change within the grid comprising:
- if the frequency change does not exceed a predetermined threshold, the power system supplying a second amount of reactive power to the grid;
- and
- if the frequency exceeds a predetermined threshold, the power system supplying a first amount of reactive power to the grid.
A method for determining when a connection of a power system to a grid has been disconnected comprising:
- locking the power system to a frequency of the grid using a phase locked loop;
- detecting a deviation from the frequency in the power system;
- and
- shutting off the power system.
The method of claim 15, wherein detecting a deviation from the frequency further comprising determining whether the deviation exceeds a predetermined threshold.
A method for determining when a connection of a power system to a grid has been disconnected comprising:
- detecting a voltage value from a voltage sensor;
- applying a transform to the voltage;
- if the D-axis voltage value exceeds a predefined threshold;
- detecting a fault;
- and
- shutting off the power system.
Dependencies are inferred from the claim text.