Power electronic converter based synchronizer for generators

A synchronizer for a power system including a first grid having a first generator with first power flow parameters, a second grid having a second generator with second power flow parameters, and a breaker installed at a point of common coupling between the first grid and the second grid, wherein the breaker in an open position separates the first grid from the second grid, and in a close position connects the first grid with the second grid, the synchronizer comprising:

• a first sensor located on a side of the point of the common coupling for continually determining the power flow parameters of the first grid, and a second sensor located on an other side of the point of the common coupling for continually determining the power flow parameters of the second grid, wherein the power flow parameters of the first and the second grid are indicative of at least a frequency and a phase;
• a converter that is a voltage source based converter is for supplying power to either the first grid or the second grid;
• and
• a controller in communication with the sensors and the converter, to synchronize at least the phases and the frequencies of the first and the second grid, by continually adjusting an amount of power supplied from the converter, based on continually determining a frequency mismatch and a phase mismatch between the first grid and the second grid, until a first predetermined condition is met, wherein the controller includes a phase-control compensator to control phase matching between the first and the second grids, a frequency-control compensator to control frequency matching between the first and the second grids, and a converter power rating based saturation block to limit a maximum power output of the converter, so that a power rating of the converter is determined based on a synchronization time between the first and the second grids, such that the synchronization time is a sum of a frequency locking time and a phase locking time, wherein the breaker changes position from the open position to the close position, when the first predetermined condition is met.

A synchronizer for a power system including a generator having first power flow parameters, a grid having a grid generator having second power flow parameters, and a breaker installed at a point of common coupling between the generator and the grid, wherein the breaker in an open position separates the generator from the grid, and in a close position connects the generator with the grid, the synchronizer comprising:

• a first sensor located on a side of the point of the common coupling for continually determining power flow parameters of the generator, and a second sensor located on an other side of the point of the common coupling for continually determining power flow parameters of the grid, wherein the power flow parameters for the generator and the grid are indicative of at least a frequency and a phase angle;
• a converter that is a voltage source based converter is for supplying power to either the generator or the grid;
• and
• a controller in communication with the sensors and the converter, to synchronize at least the phases and the frequencies of the generator and the grid, by continually adjusting an amount of power supplied from the converter, based on continually determining a frequency mismatch and a phase mismatch between the generator and the grid, until a first predetermined condition is met, wherein the controller includes a phase-control compensator to control phase matching between the first and the second grids, a frequency-control compensator to control frequency matching between the first and the second grids, and a converter power rating based saturation block to limit a maximum power output of the converter, so that a power rating of the converter is determined based on a synchronization time between the first and the second grids, such that the synchronization time is a sum of a frequency locking time and a phase locking time, wherein the breaker changes position from the open position to the close position, when the first predetermined condition is met.