Power margin tracking control method and system for multi-terminal high-voltage direct current converter station
AssigneeNorth China Electric Power University
InventorsMING ZHOU, SHIYI ZHANG, GENGYIN LI
Life of this patent
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Abstract
A power margin tracking control method and system for a multi-terminal high-voltage direct current converter station are provided. A power adjustment factor is introduced on the basis of a droop coefficient, to realize a self-adaptive regulation of a converter station operation mode to a real-time fluctuation of a wind and solar power. In this way, the system operation stability and the power fluctuation allocation capability in a grid-connected system are improved. Furthermore, a DC voltage deviation in the multi-terminal high-voltage direct current grid is reduced.
Claims8
A power margin tracking (PMT) control method for a multi-terminal high-voltage direct current (MTDC) converter station, comprising:
- obtaining a direct current (DC) operation power upper limit and a DC voltage upper limit of the MTDC converter station;
- selecting an operation point in the MTDC converter station as a reference operation point, and obtaining a DC operation power and a DC voltage of the reference operation point;
- obtaining a DC operation power of a real-time operation point in the MTDC converter station;
- determining a droop coefficient of the MTDC converter station based on the DC operation power upper limit, the DC voltage upper limit, and the DC operation power and the DC voltage of the reference operation point;
- determining a power adjustment factor of the MTDC converter station based on the DC operation power upper limit, the DC operation power of the reference operation point, and the DC operation power of the real-time operation point;
- determining a DC operation voltage of the real-time operation point based on the droop coefficient, the power adjustment factor, the DC operation power and the DC voltage of the reference operation point, and the DC operation power of the real-time operation point;
- and
- performing the PMT control on the MTDC converter station based on the DC operation voltage.
A power margin tracking (PMT) control system for a multi-terminal high-voltage direct current (MTDC) converter station, comprising:
- a first obtaining module, configured to obtain a direct current (DC) operation power upper limit and a DC voltage upper limit of the MTDC converter station;
- a reference operation point selecting module, configured to select an operation point in the MTDC converter station as a reference operation point, and obtain a DC operation power and a DC voltage of the reference operation point;
- a second obtaining module, configured to obtain a DC operation power of a real-time operation point in the MTDC converter station;
- a droop coefficient determining module, configured to determine a droop coefficient of the MTDC converter station based on the DC operation power upper limit, the DC voltage upper limit, and the DC operation power and the DC voltage of the reference operation point;
- a power adjustment factor determining module, configured to determine a power adjustment factor of the MTDC converter station based on the DC operation power upper limit, the DC operation power of the reference operation point, and the DC operation power of the real-time operation point;
- a DC operation voltage determining module, configured to determine a DC operation voltage of the real-time operation point based on the droop coefficient, the power adjustment factor, the DC operation power and the DC voltage of the reference operation point, and the DC operation power of the real-time operation point;
- and
- a PMT control module, configured to perform the PMT control on the MTDC converter station based on the DC operation voltage.
Dependencies are inferred from the claim text.